CN107099340B - Device and method for removing propylene in dry gas - Google Patents
Device and method for removing propylene in dry gas Download PDFInfo
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- CN107099340B CN107099340B CN201710481058.6A CN201710481058A CN107099340B CN 107099340 B CN107099340 B CN 107099340B CN 201710481058 A CN201710481058 A CN 201710481058A CN 107099340 B CN107099340 B CN 107099340B
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/08—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors
- C10K1/10—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with aqueous liquids
- C10K1/101—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with aqueous liquids with water only
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/08—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors
- C10K1/10—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with aqueous liquids
- C10K1/12—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with aqueous liquids alkaline-reacting including the revival of the used wash liquors
- C10K1/14—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with aqueous liquids alkaline-reacting including the revival of the used wash liquors organic
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Abstract
The invention provides a method for removing propylene in dry gas, which comprises the following steps: washing the catalytic dry gas by a washing tower, pressurizing by a dry gas compressor, buffering by a buffer tank, and absorbing by an absorbent in a propylene absorption tower to obtain tower top purified dry gas and tower bottom liquid of the absorption tower; the absorbent comprises benzene and diethylbenzene; the bottom liquid of the absorption tower passes through a deethylenizer to obtain ethylene-rich dry gas and deethylenizer bottom liquid; and (4) the bottom liquid of the ethylene removal tower passes through a propylene removal tower to obtain propylene-rich dry gas. According to the invention, the catalytic dry gas is subjected to the steps of water washing, pressurization, buffering, absorption and the like, and the final outlet dry gas has low propylene content, so that the deep removal of propylene is realized. Meanwhile, the ethylene-rich and propylene-rich dry gas obtained by the method can be further applied to downstream production.
Description
Technical Field
The invention relates to the technical field of environment, in particular to a device and a method for removing propylene in dry gas.
Background
The propylene content in the raw material dry gas is mostly over 0.7 percent, and the existence of high content of propylene can seriously affect the selectivity of the alkylation reaction and the service life of the catalyst.
At present, most of refinery dry gas removal devices for removing C3 and above mostly use a device for twice absorption and once analysis, which specifically comprises the following steps: the crude gasoline extracted from the fractionating tower is used as absorbent, and then the diesel oil is used as reabsorber to absorb crude gasoline components carried in the dry gas. The main using scheme is as follows: crude gasoline enters a first absorption tower to absorb propylene and the components in the dry gas component, a large amount of crude gasoline is carried in a gas phase at the top of the tower, the gas phase at the top of the tower is extracted and enters a second absorption tower, diesel oil is used as an absorbent to absorb the gasoline component in the gas phase, purified gas at the top of the second absorption tower enters a reactor, and a liquid phase component at the bottom of the absorption tower enters an analytical tower to be analyzed. Meanwhile, the absorption effect of the method is greatly influenced by the components of the absorbent, and the general effect after absorption is poor, so that propylene is mixed in dry gas. The following consequences are caused: 1. the propylene number is high, the added value of chemical products is high, the price is high, and the propylene is mixed in dry gas and is seriously wasted; the content of C3 and above in the absorbed dry gas is more than 1.5 percent due to the overlapping of the absorbent and the existing components of the absorbed substance, especially the high value-added components in the dry gas: the content of the propylene is more than 0.5 percent, which not only causes the waste of component overlapping, but also influences the use of subsequent dry gas. 2. The existence of propylene and the above components in the dry gas affects the reutilization of the dry gas, such as the preparation of ethylbenzene by the dry gas, the separation of the dry gas and the like. The deep removal of propylene in dry gas is a bottleneck problem to be solved by current refineries.
Disclosure of Invention
In view of this, the technical problem to be solved by the present invention is to provide a method for removing propylene from dry gas, which has a good effect of absorbing propylene.
The invention provides a device for removing propylene in dry gas, which comprises:
washing the tower with water;
the inlet of the dry gas compressor is connected with the outlet of the water washing tower;
the inlet of the buffer tank is connected with the outlet of the dry gas compressor;
the inlet of the propylene absorption tower is connected with the outlet at the top of the buffer tank; an absorbent is arranged in the absorption tower;
the inlet of the ethylene removal tower is connected with the outlet of the propylene absorption tower;
and the inlet of the propylene removing tower is connected with the outlet of the ethylene removing tower.
Preferably, the absorption agent tank is connected with the outlet at the bottom of the buffer tank through an inlet.
Preferably, the bottom outlet of the depropenizing tower is connected with the absorbent tank.
Preferably, the outlet of the top of the deethylenizer is connected to the inlet of the dry gas compressor.
Preferably, the water washing tower is a packed tower; the propylene absorption tower is a packed tower; the number of tower tray layers of the ethylene removal tower is 40-60; the number of tower tray layers of the depropenization tower is 40-60.
The invention provides a method for removing propylene in dry gas, which comprises the following steps:
washing the catalytic dry gas by a washing tower, pressurizing by a dry gas compressor, buffering by a buffer tank, and absorbing by an absorbent in a propylene absorption tower to obtain tower top purified dry gas and tower bottom liquid of the absorption tower; the absorbent comprises benzene and diethylbenzene;
the bottom liquid of the absorption tower passes through a deethylenizer to obtain ethylene-rich dry gas and deethylenizer bottom liquid;
and (4) the bottom liquid of the ethylene removal tower passes through a propylene removal tower to obtain propylene-rich dry gas.
Preferably, the mass ratio of benzene to diethylbenzene in the absorbent is (80-90): (10-20).
Preferably, the mass ratio of benzene to diethylbenzene in the absorbent is (87-90): (13-20).
Preferably, the dry gas compressor is internally provided with spraying liquid; the spray liquid comprises benzene and diethylbenzene; the mass ratio of the benzene to the diethylbenzene is (80-90): (10-20).
Preferably, the pressure of the dry gas compressor is 0.7-0.8 MPa.
Compared with the prior art, the invention provides a method for removing propylene in dry gas, which comprises the following steps: washing the catalytic dry gas by a washing tower, pressurizing by a dry gas compressor, buffering by a buffer tank, and absorbing by an absorbent in a propylene absorption tower to obtain tower top purified dry gas and tower bottom liquid of the absorption tower; the absorbent comprises benzene and diethylbenzene; the bottom liquid of the absorption tower passes through a deethylenizer to obtain ethylene-rich dry gas and deethylenizer bottom liquid; and (4) the bottom liquid of the ethylene removal tower passes through a propylene removal tower to obtain propylene-rich dry gas. According to the invention, the catalytic dry gas is subjected to the steps of water washing, pressurization, buffering, absorption and the like, and the final outlet dry gas has low propylene content, so that the deep removal of propylene is realized. Meanwhile, the ethylene-rich and propylene-rich dry gas obtained by the method can be further applied to downstream production.
Drawings
FIG. 1 is a diagram of an apparatus for removing propylene from dry gas according to one embodiment of the present invention.
Detailed Description
The invention provides a device for removing propylene in dry gas, which comprises:
washing the tower with water;
the inlet of the dry gas compressor is connected with the outlet of the water washing tower;
the inlet of the buffer tank is connected with the outlet of the dry gas compressor;
the inlet of the propylene absorption tower is connected with the outlet at the top of the buffer tank; an absorbent is arranged in the absorption tower;
the inlet of the ethylene removal tower is connected with the outlet of the propylene absorption tower;
and the inlet of the propylene removing tower is connected with the outlet of the ethylene removing tower.
The device for removing propylene in dry gas provided by the invention is used for removing components such as propane, isobutane, butylene, n-butylene, isobutylene and maleic while realizing the important deep removal of propylene. The device can be used independently, or can be used by connecting with an upstream device and a downstream device, and the device is not limited in the application.
The device for removing propylene in dry gas provided by the invention comprises a water washing tower. The water washing tower is preferably a packed tower; the filler is preferably a one-stage filler. The specific model and specification of the water washing tower are not limited in the invention, and the water washing tower is well known to those skilled in the art.
The catalytic dry gas can primarily absorb solid carbon particles carried in the catalytic dry gas, alkaline substances such as ethanolamine carried after the dry gas is desulfurized and other water-soluble substances through the water washing tower. Solid particles and other impurities can influence the purity and the service time of the absorbent, and alkaline substances such as ethanolamine and the like are brought into a subsequent path to influence the absorbent on one hand and cause the rapid deactivation of a alkylation reaction catalyst on the other hand, so that the influence is great.
The device for removing propylene in dry gas comprises a dry gas compressor with an inlet connected with an outlet of the water scrubber.
The specific model and specification of the dry gas compressor are not limited in the present invention, and those skilled in the art can easily understand the specification.
The dry gas compressor is preferably provided with spray liquid; the spray liquid preferably comprises benzene and diethylbenzene; the mass ratio of the benzene to the diethylbenzene is preferably (80-90): (10-20); more preferably (87-90): (13-20); most preferably 87: 13.
The compressor can effectively control the dry gas quantity and pressure of the inlet device, and ensure the stability of a dry gas refining system; meanwhile, the compressor can increase the pressure of dry gas, and plays an important role in improving the yield of the device and reducing the cost.
The device for removing propylene in the dry gas comprises a buffer tank with an inlet connected with an outlet of the dry gas compressor.
The invention is not limited to the specific model and specification of the buffer tank, and the buffer tank is well known to those skilled in the art. The buffer tank comprises an inlet, a buffer tank top outlet and a buffer tank bottom outlet. The top outlet is connected with the inlet of the propylene absorption tower, and the bottom outlet is connected with the absorbent tank.
The buffer tank can realize the enrichment of the spray liquid; when the liquid level of the spraying liquid is higher, the spraying liquid can be discharged into the absorbent tank to be used as the absorbent, so that the absorbent can be recycled, and the waste is avoided. Meanwhile, the device raw materials such as catalysis and coking devices have large changes, so that the pressure fluctuation of a dry gas pipe network is large, the device fluctuation can be influenced even is difficult to control when the dry gas pipe network directly enters the ethylbenzene device, and the whole dry gas refining system is collapsed.
The invention also comprises an absorbent tank with an inlet connected with the outlet at the bottom of the buffer tank.
The specific type and specification of the absorbent canister are not limited in the present invention and are well known to those skilled in the art.
The absorbent tank of the device is connected with the buffer tank, so that the recycling of the absorbent can be realized, and the waste is reduced.
The device for removing the propylene in the dry gas comprises a propylene absorption tower, an inlet of which is connected with an outlet at the top of the buffer tank; an absorbent is arranged in the absorption tower.
The propylene absorption tower is preferably a packed tower; more preferably a seven-stage packed column. The present invention is not limited to the specific type and specification of the propylene absorption column, and those skilled in the art will be familiar with the present invention.
The propylene absorption tower is internally provided with an absorbent; the absorbent comprises benzene and diethylbenzene; the mass ratio of benzene to diethylbenzene in the absorbent is preferably (80-90): (10-20); more preferably (87-90): (13-20); most preferably 87: 13.
The propylene absorption tower combined with the specific absorbent has good propylene absorption effect, can realize deep removal of propylene compared with the prior device, and can seriously influence the selectivity of alkylation reaction and the service life of the catalyst due to the existence of the propylene in the prior raw material dry gas of more than 0.7 percent, and the propylene component of the purified dry gas absorbed by the device of the invention reaches about 0.1 percent.
The purified dry gas passing through the top of the propylene absorption tower can directly enter the alkylation reactor for reaction.
The device for removing the propylene in the dry gas comprises an inlet of a deethylenizer connected with an outlet of the propylene absorption tower.
The number of tower tray layers of the ethylene removal tower is preferably 40-60; more preferably 50 to 60 layers. The present invention is not limited to the specific type and specification of the deethylenizer, and those skilled in the art will be familiar with the present invention.
The outlet of the ethylene removal tower top is connected with the inlet of the dry gas compressor. Namely, the circulating dry gas with higher ethylene content at the top outlet of the ethylene removal tower is recycled before entering a compressor, and tower bottom liquid enters a propylene removal tower.
The device for removing propylene in dry gas comprises a propylene removal tower, wherein an inlet of the propylene removal tower is connected with an outlet of the ethylene removal tower.
The number of tower tray layers of the depropenizing tower is preferably 40-60; more preferably 50 to 60 layers. The present invention does not limit the specific type and specification of the depropenizer, and those skilled in the art are familiar with the present invention.
The bottom outlet of the depropenizing tower is connected with the absorbent tank. Namely the lean solution at the bottom of the depropenization tower returns to the absorbent tank for recycling. The propylene-rich overhead is sent to downstream equipment for further utilization.
Fig. 1 is a diagram of an apparatus for removing propylene from dry gas according to an embodiment of the present invention, wherein:
1 is a water washing tower, and 2 is a dry gas compressor; 3 is a buffer tank, 4 is an absorbent tank, and 5 is a propylene absorption tower; 6 is a deethylenizer and 7 is a depropenizer.
The invention provides a method for removing propylene in dry gas, which comprises the following steps:
washing the catalytic dry gas by a washing tower, pressurizing by a dry gas compressor, buffering by a buffer tank, and absorbing by an absorbent in a propylene absorption tower to obtain tower top purified dry gas and tower bottom liquid of the absorption tower; the absorbent comprises benzene and diethylbenzene;
the bottom liquid of the absorption tower passes through a deethylenizer to obtain ethylene-rich dry gas and deethylenizer bottom liquid;
and (4) the bottom liquid of the ethylene removal tower passes through a propylene removal tower to obtain propylene-rich dry gas.
The method for removing propylene in dry gas provided by the invention comprises the steps of firstly washing catalytic dry gas by a washing tower, pressurizing by a dry gas compressor, buffering by a buffer tank, and absorbing by an absorbent in a propylene absorption tower to obtain purified dry gas at the top of the tower and liquid at the bottom of the absorption tower.
The catalytic dry gas is firstly washed by a water washing tower. After washing, solid carbon particles carried in the catalytic dry gas, alkaline substances such as ethanolamine carried after desulfurization of the dry gas and other water-soluble substances can be absorbed for the first time. Solid particles and other impurities can affect the purity and lifetime of the absorbent.
Pressurizing by a dry gas compressor after washing; the pressure of the dry gas compressor is preferably 0.7-0.8 MPa.
The dry gas inlet amount and the pressure can be effectively controlled by controlling the pressure, and the stability of a dry gas refining system is ensured.
The dry gas compressor is internally provided with spraying liquid; the spray liquid comprises benzene and diethylbenzene; the mass ratio of the benzene to the diethylbenzene is (80-90): (10-20).
The spray liquid and the absorbent have the same components, so that the circulation of the absorbent can be realized, the waste is reduced, and the effect of absorbing propylene is good.
After pressurization, buffering by a buffer tank; the influence of pressure fluctuation of a pipe network on absorption can be effectively relieved through the buffering of the buffer tank; meanwhile, the recycling of the absorbent can be realized.
Absorbing by an absorbent in the propylene absorption tower after buffering to obtain purified dry gas at the top of the tower and liquid at the bottom of the absorption tower.
The absorbent comprises benzene and diethylbenzene; the mass ratio of benzene to diethylbenzene in the absorbent is preferably (80-90): (10-20); more preferably (87-90): (13-20); most preferably 87: 13.
The specific absorbent has good effect of absorbing propylene and can realize deep removal of propylene.
After absorption, the purified dry gas at the tower top can enter into the alkylation reactor for further reaction.
The bottom liquid of the absorption tower passes through a deethylenizer to obtain ethylene-rich dry gas and deethylenizer bottom liquid.
The ethylene-rich dry gas can be recycled before entering the compressor.
And (4) the bottom liquid of the ethylene removal tower passes through a propylene removal tower to obtain propylene-rich dry gas.
The propylene-rich dry gas may be passed to downstream applications.
The present invention has been described clearly above with respect to the apparatus involved in the above method, and will not be described herein again.
The invention provides a method for removing propylene in dry gas, which comprises the following steps: washing the catalytic dry gas by a washing tower, pressurizing by a dry gas compressor, buffering by a buffer tank, and absorbing by an absorbent in a propylene absorption tower to obtain tower top purified dry gas and tower bottom liquid of the absorption tower; the absorbent comprises benzene and diethylbenzene; the bottom liquid of the absorption tower passes through a deethylenizer to obtain ethylene-rich dry gas and deethylenizer bottom liquid; and (4) the bottom liquid of the ethylene removal tower passes through a propylene removal tower to obtain propylene-rich dry gas. According to the invention, the catalytic dry gas is subjected to the steps of water washing, pressurization, buffering, absorption and the like, and the final outlet dry gas has low propylene content, so that the deep removal of propylene is realized. Meanwhile, the ethylene-rich and propylene-rich dry gas obtained by the method can be further applied to downstream production.
The invention preferably measures the components in the final purified dry gas in the following way: and (4) carrying out full component determination by adopting a gas chromatography-mass spectrometer.
In order to further illustrate the present invention, the following will describe the apparatus for removing propylene from dry gas and the method for removing propylene from dry gas in detail with reference to the examples.
Example 1
According to the invention, a water washing tower (a section of packed tower), a dry gas compressor and a buffer tank are sequentially connected, an outlet at the top of the buffer tank is connected with a propylene absorption tower (seven sections of packed tower), and an outlet at the bottom of the buffer tank is connected with an absorbent tank; the outlet of the buffer tank is connected with the inlet of the propylene absorption tower; the outlet of the propylene absorption tower is connected with the inlet of the ethylene removal tower (50 layers of trays), the outlet at the top of the ethylene removal tower is connected with the inlet of the dry gas compressor, and the outlet at the bottom of the ethylene removal tower is connected with the propylene removal tower (50 layers of trays). Returning the bottom liquid of the depropenization tower to the absorbent tank.
Examples 2 to 23
According to the embodiment 1 of the invention, a device is connected, catalytic dry gas is washed by a washing tower, a dry gas compressor is used for pressurizing to 0.8Mpa, a buffer tank is used for buffering, and then the catalytic dry gas is absorbed by an absorbent in a propylene absorption tower, so that tower top purified dry gas and tower bottom liquid of the absorption tower are obtained; benzene and diethylbenzene in the absorbent are 87: 13; the bottom liquid of the absorption tower passes through a deethylenizer to obtain ethylene-rich dry gas and deethylenizer bottom liquid; and (4) the bottom liquid of the ethylene removal tower passes through a propylene removal tower to obtain propylene-rich dry gas.
Example 24
The measurement results of the components in the catalytic dry gas and the clean dry gas in example 2 of the present invention are shown in tables 1 and 2, where table 1 is a component content table of the catalytic dry gas in example 2 of the present invention, and table 2 is a component content table of the clean dry gas.
TABLE 1 table of contents of components in catalytic dry gas of examples of the present invention and comparative examples
TABLE 2 content of component of purified dry gas of examples of the present invention and comparative examples
Comparative example 1
Adopt current device to purify propylene, specifically do: crude gasoline enters an absorption tower 1 to absorb propylene and the components in the dry gas component, a large amount of crude gasoline is carried in a gas phase at the top of the tower, the gas is extracted from the top of the tower and enters an absorption tower 2, diesel oil is used as an absorbent to absorb the gasoline component in the gas phase, purified gas at the top of the absorption tower 2 enters a reactor, and a liquid phase component at the bottom of the absorption tower 1 enters a desorption tower to be desorbed. Specific results are shown in table 1.
Comparative example 2
Device individual absorbents of the present invention
According to the embodiment 1 of the invention, a device is connected, catalytic dry gas is washed by a washing tower, a dry gas compressor is used for pressurizing to 0.8Mpa, a buffer tank is used for buffering, and then the catalytic dry gas is absorbed by an absorbent in a propylene absorption tower, so that tower top purified dry gas and tower bottom liquid of the absorption tower are obtained; the absorbent is benzene; the bottom liquid of the absorption tower passes through a deethylenizer to obtain ethylene-rich dry gas and deethylenizer bottom liquid; and (4) the bottom liquid of the ethylene removal tower passes through a propylene removal tower to obtain propylene-rich dry gas. Specific results are shown in table 1.
Comparative example 3
According to the embodiment 1 of the invention, a device is connected, catalytic dry gas is washed by a washing tower, a dry gas compressor is used for pressurizing to 0.8Mpa, a buffer tank is used for buffering, and then the catalytic dry gas is absorbed by an absorbent in a propylene absorption tower, so that tower top purified dry gas and tower bottom liquid of the absorption tower are obtained; the absorbent is diethylbenzene; the bottom liquid of the absorption tower passes through a deethylenizer to obtain ethylene-rich dry gas and deethylenizer bottom liquid; and (4) the bottom liquid of the ethylene removal tower passes through a propylene removal tower to obtain propylene-rich dry gas. Specific results are shown in table 1.
Comparative example 4
According to the embodiment 1 of the invention, a device is connected, catalytic dry gas is washed by a washing tower, a dry gas compressor is used for pressurizing to 0.8Mpa, a buffer tank is used for buffering, and then the catalytic dry gas is absorbed by an absorbent in a propylene absorption tower, so that tower top purified dry gas and tower bottom liquid of the absorption tower are obtained; the absorbent is benzene and diethylbenzene 95: 3; the bottom liquid of the absorption tower passes through a deethylenizer to obtain ethylene-rich dry gas and deethylenizer bottom liquid; and (4) the bottom liquid of the ethylene removal tower passes through a propylene removal tower to obtain propylene-rich dry gas. Specific results are shown in table 1.
Comparative example 5
According to the embodiment 1 of the invention, a device is connected, catalytic dry gas is washed by a washing tower, a dry gas compressor is used for pressurizing to 0.8Mpa, a buffer tank is used for buffering, and then the catalytic dry gas is absorbed by an absorbent in a propylene absorption tower, so that tower top purified dry gas and tower bottom liquid of the absorption tower are obtained; the absorbent is toluene; the bottom liquid of the absorption tower passes through a deethylenizer to obtain ethylene-rich dry gas and deethylenizer bottom liquid; and (4) the bottom liquid of the ethylene removal tower passes through a propylene removal tower to obtain propylene-rich dry gas. Specific results are shown in table 1.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (3)
1. A method for removing propylene in dry gas by using a device for removing propylene in dry gas is characterized by comprising the following steps:
washing the catalytic dry gas by a washing tower, pressurizing by a dry gas compressor, buffering by a buffer tank, and absorbing by an absorbent in a propylene absorption tower to obtain tower top purified dry gas and tower bottom liquid of the absorption tower; the absorbent comprises benzene and diethylbenzene; the mass ratio of benzene to diethylbenzene in the absorbent is (80-90): (10-20); spraying liquid is arranged in the dry gas compressor; the spray liquid comprises benzene and diethylbenzene; the mass ratio of the benzene to the diethylbenzene is (80-90): (10-20);
the bottom liquid of the absorption tower passes through a deethylenizer to obtain ethylene-rich dry gas and deethylenizer bottom liquid;
the bottom liquid of the ethylene removal tower passes through a propylene removal tower to obtain propylene-rich dry gas;
the device for removing propylene in dry gas comprises:
washing the tower with water; the water washing tower is a packed tower;
the inlet of the dry gas compressor is connected with the outlet of the water washing tower; the inlet of the buffer tank is connected with the outlet of the dry gas compressor;
the inlet of the absorbent tank is connected with the outlet at the bottom of the buffer tank;
the inlet of the propylene absorption tower is connected with the outlet at the top of the buffer tank; the propylene absorption tower is a packed tower; an absorbent is arranged in the propylene absorption tower;
the inlet of the ethylene removal tower is connected with the outlet of the bottom of the propylene absorption tower; the outlet of the top of the deethylenizer is connected with the inlet of the dry gas compressor;
the inlet of the propylene removing tower is connected with the outlet of the bottom of the ethylene removing tower;
and the bottom outlet of the depropenizing tower is connected with the absorbent tank.
2. The method according to claim 1, wherein the mass ratio of benzene to diethylbenzene in the absorbent is (87-90): (13-20).
3. The method according to claim 1, wherein the dry gas compressor pressurizes at a pressure of 0.7 to 0.8 Mpa.
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| CN113354506B (en) * | 2021-03-19 | 2023-02-28 | 北京欧谊德科技有限公司 | Method for recovering and separating low-carbon hydrocarbons from refinery saturated dry gas by combined absorption |
| CN113121301B (en) * | 2021-05-18 | 2022-10-28 | 北京欧谊德科技有限公司 | Recovery method of light hydrocarbon in refinery dry gas |
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| CN101768043B (en) * | 2008-12-31 | 2013-09-25 | 中国科学院大连化学物理研究所 | Method for preparing ethylbenzene by reaction of dilute ethylene and benzene |
| WO2015065839A1 (en) * | 2013-10-30 | 2015-05-07 | Dow Globlal Technologies Llc | Hybrid solvent formulations for selective h2s removal |
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