JPH01153604A - Slime controller for petroleum fuel - Google Patents

Abstract

PURPOSE:To obtain the title controller containing 2-n-octyl-4-isothiazolone and 2,3,5,6-tetrachloro-4-(methylsulfonyl)pyridine showing inhibitory effects on growth of molds, main part of slime. CONSTITUTION:A slime controller containing 2-n-octyl-4-isothiazolone and 2,3,5,6- tatrachloro-4-(methylsulfonyl)pyridine as active ingredients, having extremely inhibitory effects on growth of molds, main part of slime, not changing qualities of fuel, readily soluble in fuel, soluble in water at the interface of water base. The blending ratio of the two compounds is 0.1-5, preferably 0.2-1pt.wt. of the latter based on 1pt.wt. of the former. The content ratio of the active ingredients is about 1-30wt.%, preferably 10-30wt.%. The amount of the controller added to heavy oil, gasoline, kerosine, jet fuel, etc. is 50-10,000ppm, especially about 100-5,000ppm.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a slime control agent for controlling slime generated in petroleum fuel used in engines, generators, blowers, etc.

<Prior art and problems> Molds, bacteria, yeast, actinomycetes, etc. proliferate in the presence of moisture, nutrients, and appropriate temperature, resulting in industrial microbial contamination, rot, deterioration, discoloration, and cloudiness. , causing precipitation, bad odor, etc. And because they cause various problems, pesticides are used to prevent them.

Fuels such as A-heavy oil, light oil, aviation fuel, and gasoline are stored in tanks, so water gets mixed in due to tank breathing and coalescence phenomena. Especially at the interface between the oil layer and the water layer, mold, bacteria, yeast, etc.
Microorganisms such as actinomycetes occur.

The aggregate of these microorganisms and the sludge in the system is called slime. When slime is generated, it adheres to or floats in tanks, piping, etc., causing clogging (t, b) during the fuel filtration process, and impairing the flow in the piping. In general, heavy oil A has problems due to asphaltene and paraffinic sludge, but since these settle relatively slowly and are dispersed, they are removed by passing through a filter equipped with a centrifugal separation function. On the other hand, slime, which is mainly made up of microorganisms, is large in size and sticky, so it can rapidly clog filters, making it impossible to operate engines and generators, and is dangerous to ships. For this reason, some ships have conventionally used slime control agents, but they do not show any slime control effect on some molds, yeasts, etc. Examples of conventionally used drugs include the following drugs. Methylene bisthiocyanate, benzalkonium chloride, 1,2-pentwinthiazolin-3-one, nonionic and cationic surfactants, etc.

These agents have traditionally been used as slime control agents for papermaking and cooling water, but (1) they are effective against bacteria but weak against mold, and (2) they are effective on culture media. Methylene bisthiocyanate has problems such as being difficult to dissolve in heavy oil, (3) having a weak effect at the A heavy oil-water interface, and (4) methylene bisthiocyanate being extremely toxic to living organisms.

<Means for solving the problem> As a result of intensive research into the above-mentioned problems, the present inventors found that the main body of slime is filamentous fungi, and that the slime is mainly composed of filamentous fungi.
Furthermore, upon researching these filamentous fungi, we discovered that they were a collection of various microorganisms consisting of yeasts of the genus Cladosphorium, Penicillium, Aspergillus, etc., and yeasts of the genus Campita.
These fungi are present at low concentrations (10
As a result of research into a drug that has a significant growth-inhibiting effect at a concentration of about 0 to 200 ppm), does not alter the quality of the fuel, is easily dissolved in the fuel, and is also water-soluble in the aqueous system at the interface, the present invention was completed. Ta.

That is, the present invention provides 2-n-octyl-4-isothiazolone (referred to as compound A) and 2,3,5,6-tetrachloro-4-(methylsulfonylhyridine (referred to as compound B)).
An object of the present invention is to provide a slime control agent for petroleum-based fuel, which contains as an active ingredient.

<Structure> Compounds A and B, which are the active ingredients of the present invention, are insoluble in water and soluble in organic solvents, and are used by adding a solvent, a surfactant, etc. according to the needs of the hair.

As the solvent, glycol solvents such as ethylene glycol, diethylene glycol, diethylene glycol, alcohol solvents such as methanol, ethanol,
Peng σ, xylene, leclohexanone, toluene, THF
, butylseronrug, oleyl alcohol, etc. are used. Nonionic or anionic surfactants are preferably used, and examples of nonionic surfactants include polyoxyethylene surfactants such as polyoxyethylene styrenated phenol, polyoxyethylene phenyl ether, and polyoxyethylene alkyl ether. and polyhydric alcohol esters such as nrubitan fatty acid ester. The anionic surfactant is preferably an alkylaryl sulfonate salt, such as sodium alkylbenzene sulfonate.

The mixing ratio of compound A and compound B varies somewhat depending on the fuel, but is usually 80.1 to 5 parts, preferably 0.2 to 1 part, of the compound to 1 part of compound A (same parts by weight). .

The content of the active ingredient in the pesticidal agent of the present invention varies depending on the dosage form and purpose of use, but it is generally about 1 to 30% by weight, preferably 10 to 30% by weight. At this time, it is preferable that the amount of the solvent is 60 to 98% by weight, and the amount of surfactant is about 1 to 10% by weight.

The pesticidal agent of the present invention may be used with the addition of a voice control buffer, an antifreeze agent, a fragrance, an antifoaming agent, and other industrial fungicides. Other industrial fungicides include halodanated phenols, tetrachloroinphthalonitrile, short methyl
p-) 1) Lusulfone, 4-10 Lophenyl-3-
Iodoglopa gilhor? -A/, 3-iodoj-
2-7'/4' Gylbutylcarbamate, N-dimethyl-N-phenyl-(N/-fluorosochloromethylthio)sulfamide, 2-promo 2-nitro-1,
3-f lopanediol, 1,2-pentzithiazolin-3-one, 2-(4°-thiocyanomethylthio)benzothiazole, 2-methoxycarbonylaminopenzimidazole, 5-chloro-2-methyl-4-inthiazoline -3-one, 2-methyl-4-inthiazoline-3
-on, etc., but the present invention is not limited to these examples.

Petroleum-based fuels include heavy oil, light oil, gasoline, kerosene, and jet fuel.

The amount of the pest control agent of the present invention added to petroleum fuel depends on the type of fuel, but is preferably 50 to 110,000 pp.
In particular, it is 100 to 5000 ppm.

The drug of the present invention can be prepared by adding a single agent of compound A and a single agent of compound B to fuel such as heavy oil separately, or by adding compound B after adding compound A to fuel, or by adding compound B to fuel such as compound B. Compound B may be added after the addition of compound B to heavy oil A, or a mixture of compound A and compound B may be added to heavy oil A.

Effectiveness> The slime control agent of the present invention can be easily dissolved and mixed with various fuels and has an excellent slime generation prevention effect even at low concentrations. It is an excellent product, as it does not cause any chemical reactions, nor does it have any strong effects (toxicity) on the human body.

Hereinafter, the present invention will be explained in detail with reference to examples. Example 1 and Comparative Examples 1 to 2 Unless otherwise specified, Compound B was dissolved in a mixed solvent (cyclohexanone, dimethylformamide) as Example 1 according to the above formulation, and then Furthermore, compound A, -(nerol-N-100
(Nonionic surfactant manufactured by Matsumoto Yushi Pharmaceutical Co., Ltd.) was added and dissolved to prepare a slime control agent.

Similarly, the slime control agents of Control Examples 1 and 2 were prepared by using the above-mentioned formulations in which each of Compounds A and B was used alone in a mixed solvent.

Test example 1 (antibacterial activity test) Prepare a drug solution diluted with sterile water, and add 1 d of the diluted solution to 50%
The mixture was mixed with 49° C.-cooled culture medium (potato decoction agar) and placed in a sterilized Petri dish with a diameter of 9° C. to prepare an agar plate containing a drug solution at a predetermined concentration. A spore suspension of the test bacteria (separated from A heavy oil slime) was prepared in advance by culturing on a slant medium at 28°C for 7 days, and then a sterilized paper with a diameter of 5 pieces was prepared.
A disk was impregnated with each spore suspension and placed on a plate. These Petri dishes were cultured at 28° C. for 7 days to examine the presence or absence of mold growth, and the lowest drug concentration that completely inhibited the growth of each plot (minimum growth-inhibiting concentration) was determined. The results are shown in Table 1, and the drug consisting of a mixture of the compound of the present invention and compound B has a synergistic antibacterial effect on the following molds and yeasts F-1 to Y-3.

F-1: Cladosporium Ip.

(Cladosporium sp.) F-2: Penicillium 1ips (Penicillium sp.) F-3: Aspergillus Ips (Aspergillus sp.) F-4: Fusarium 1Ip6 (Fusarium sp.) F-5: Psnicillium l1pa (Penicillium sp.) Rium SP) Y-1: Candi da lIp.

(Candida SP) Y-2: Candida ap.

(Candida SP) Y-3: Torulopsis ljp.

(Torulopsis sp.) In order to confirm the slime control effect of the drug in heavy oil A, we conducted experiments on the preventive effect of suppressing the germination of spores and the bactericidal effect of directly acting on already generated bacterial cells to kill them. .

Test (Example 2 (Spore suspension inoculation method) Test method 10 d of inorganic salt liquid medium was placed in a 418 m test tube, and 9.51 rLl of heavy oil A containing the prescribed amount of the drugs of Examples and Controls was added. Next, The spores of the fungus that had been cultured on the slope were collected, dispersed in heavy oil A, and inoculated with 0.5 + nl.Still cultured at 25°C ± 2°C for 30 days, and slime was generated at the interface of the heavy oil A-water layer. I considered whether or not to do so.

Judgment Criteria M: No slime generation (10) Low slime generation (Ushii) High slime generation Active ingredient of commercially available drug A: Organic non-metallic compound B: Cationic surfactant Test Example 3 (Bacterial flora inoculation method) Test method For inoculation A bacterial colony of 6 bacteria (mold: 3 m x 3 ms in size) and a loopful of yeast were inoculated.

The other conditions are the spore suspension inoculation method and ') prevention by suppressing spore germination in each image, which shows that the drug of the invention has an excellent slime generation control effect in heavy oil A even at a low concentration of about 100 to 250 ppm. It was confirmed because of its effectiveness and its bactericidal effect, which kills existing bacteria.

Agent Patent Attorney Katsutoshi Takahashi

Claims (1)

[Claims] 2-n-octyl-4-isothiazolone and 2,3,5,
A slime control agent for petroleum fuel containing 6-tetrachloro-4-(methylsulfonyl)pyridine as an active ingredient.