GB767716A - Improvements in a method for granulating urea - Google Patents

Improvements in a method for granulating urea

Info

Publication number
GB767716A
GB767716A GB28313/53A GB2831353A GB767716A GB 767716 A GB767716 A GB 767716A GB 28313/53 A GB28313/53 A GB 28313/53A GB 2831353 A GB2831353 A GB 2831353A GB 767716 A GB767716 A GB 767716A
Authority
GB
United Kingdom
Prior art keywords
per cent
temperature
urea
solution
granules
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB28313/53A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chemical Construction Corp
Original Assignee
Chemical Construction Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chemical Construction Corp filed Critical Chemical Construction Corp
Publication of GB767716A publication Critical patent/GB767716A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05C—NITROGENOUS FERTILISERS
    • C05C9/00—Fertilisers containing urea or urea compounds
    • C05C9/005—Post-treatment
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C273/00—Preparation of urea or its derivatives, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups
    • C07C273/02—Preparation of urea or its derivatives, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups of urea, its salts, complexes or addition compounds
    • C07C273/14—Separation; Purification; Stabilisation; Use of additives
    • C07C273/16—Separation; Purification

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

Granulated urea is produced by heating an aqueous solution of urea to a sufficient temperature to evaporate sufficient water therefrom to produce a 90-98 per cent urea concentration as rapidly as possible without allowing the solution temperature to exceed 100 DEG C. for more than 5 hours nor to exceed 80 DEG C. for sufficient time to produce more than 5 per cent biuret; then rapidly raising the solution temperature to from 115 DEG to 130 DEG C., if it is not already at that temperature, and spraying the so-concentrated and heated solution into a gas-cooled granulation tower, whereby round discrete urea granules are obtained; collecting said granules; subjecting collected granules to the action of heated air at a temperature below the softening temperature of said granules until the residual moisture content does not exceed about 0.5 per cent and cooling resultant granules to atmospheric temperature. In an example, a urea solution is concentrated at 100-125 DEG C. for 4 hours to a urea concentration of 95 per cent with a biuret content of 3.9 per cent, and the solution is sprayed at 118 DEG C. and 100 m. Hg. pressure into a granulation tower through which air at 20 DEG C. flows from the bottom; the particles so formed are changed to a rotary kiln drier and dried with air at 60 DEG C., and then cool air at 5 DEG C. is passed over the particles until the moisture content of said particles is 0.4 per cent.
GB28313/53A 1952-10-25 1953-10-14 Improvements in a method for granulating urea Expired GB767716A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP767716X 1952-10-25

Publications (1)

Publication Number Publication Date
GB767716A true GB767716A (en) 1957-02-06

Family

ID=13614837

Family Applications (1)

Application Number Title Priority Date Filing Date
GB28313/53A Expired GB767716A (en) 1952-10-25 1953-10-14 Improvements in a method for granulating urea

Country Status (1)

Country Link
GB (1) GB767716A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005049193A1 (en) * 2003-11-10 2005-06-02 Dsm Ip Assets B.V. Process for the preparation of urea granules
CN112745889A (en) * 2019-10-30 2021-05-04 中国石油化工股份有限公司 Method for reducing cloud point of lubricating oil base oil

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005049193A1 (en) * 2003-11-10 2005-06-02 Dsm Ip Assets B.V. Process for the preparation of urea granules
EA009533B1 (en) * 2003-11-10 2008-02-28 ДСМ АйПи ЭССЕТС Б.В. Process for the preparation of urea granules
CN100434152C (en) * 2003-11-10 2008-11-19 帝斯曼知识产权资产管理有限公司 Process for the preparation of urea granules
US7498055B2 (en) 2003-11-10 2009-03-03 Dsm Ip Assets B.V. Process for the preparation of urea granules
AU2004291238B2 (en) * 2003-11-10 2009-09-17 Stamicarbon B.V. Process for the preparation of urea granules
CN112745889A (en) * 2019-10-30 2021-05-04 中国石油化工股份有限公司 Method for reducing cloud point of lubricating oil base oil
CN112745889B (en) * 2019-10-30 2023-01-10 中国石油化工股份有限公司 Method for reducing cloud point of lubricating oil base oil

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