GB876676A - Improvements in and relating to urea compositions - Google Patents

Improvements in and relating to urea compositions

Info

Publication number
GB876676A
GB876676A GB4067758A GB4067758A GB876676A GB 876676 A GB876676 A GB 876676A GB 4067758 A GB4067758 A GB 4067758A GB 4067758 A GB4067758 A GB 4067758A GB 876676 A GB876676 A GB 876676A
Authority
GB
United Kingdom
Prior art keywords
para
urea
substituted
particulate
substituted urea
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
GB4067758A
Inventor
Peter Evans
Dennis Godfrey Brooke
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.)
Imperial Chemical Industries Ltd
Original Assignee
Imperial Chemical Industries Ltd
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 Imperial Chemical Industries Ltd filed Critical Imperial Chemical Industries Ltd
Priority to GB4067758A priority Critical patent/GB876676A/en
Priority to FR813378A priority patent/FR1246424A/en
Publication of GB876676A publication Critical patent/GB876676A/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

Landscapes

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

Abstract

Particulate urea having improved free-flowing properties and improved resistance to caking is prepared by adding to particulate urea a minor quantity of a substituted urea of the formula R1R2N.CO.NH2, in which R1 is a monovalent organic group and R2 is hydrogen or a monovalent organic group, or a minor quantity of a compound which is known to react with the particulate urea at the temperature employed to produce the above substituted urea in situ. The substituted urea may be added in quantities ranging from 0.0001% to 0.5% by weight of the particulate urea, the latter being in crystalline, granular or pellet form. The substituted urea may also be added during a drying stage of a process for preparing particulate urea from a melt or concentrated solution. The R1 and/or R2 substituents of the substituted urea may represent alkyl, cycloalkyl, heterocyclic (e.g. pyridyl) and substituted or unsubstituted aryl radicals, exemplified aryl substituents being halogens and alkoxy, alkyl, amino, hydroxy, nitro, carboxyl and acylamino groups. Substances producing the substituted urea in situ are preferably amines of the formula R1R2NH. Amines exemplified for such a purpose are ortho- and paratoluidine, para-anisidine, para-phenetidine, As-dimethyl-para-phenylene-diamine, As-diethylparaphenylenediamine, 2,4- xylidine, para-aminodiphenyl, sulphanilic acid, para-nitroaniline, para-bromoaniline, aniline, para-phenylenediamine, 2- amino -4- nitroluene, paraaminodiphenylamine, 4- aminophthalic acid, benzidine, diphenylamine, phenacetine, phenylhydrazine and 1-aminoanthraquinone. Specification 876,675 is referred to.
GB4067758A 1958-12-17 1958-12-17 Improvements in and relating to urea compositions Expired GB876676A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB4067758A GB876676A (en) 1958-12-17 1958-12-17 Improvements in and relating to urea compositions
FR813378A FR1246424A (en) 1958-12-17 1959-12-17 Urea compositions in particulate form

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4067758A GB876676A (en) 1958-12-17 1958-12-17 Improvements in and relating to urea compositions

Publications (1)

Publication Number Publication Date
GB876676A true GB876676A (en) 1961-09-06

Family

ID=10416074

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4067758A Expired GB876676A (en) 1958-12-17 1958-12-17 Improvements in and relating to urea compositions

Country Status (1)

Country Link
GB (1) GB876676A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3515199A (en) * 1967-11-20 1970-06-02 Lincoln Valley Minerals Inc Method and apparatus for recovering solids dissolved or suspended in a liquid solvent
US3534097A (en) * 1966-03-08 1970-10-13 Nat Res Dev Manufacture of urea
EP0561235A2 (en) * 1992-03-18 1993-09-22 Agrolinz Melamin GmbH Urea granules coated with melanin powder

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3534097A (en) * 1966-03-08 1970-10-13 Nat Res Dev Manufacture of urea
US3515199A (en) * 1967-11-20 1970-06-02 Lincoln Valley Minerals Inc Method and apparatus for recovering solids dissolved or suspended in a liquid solvent
EP0561235A2 (en) * 1992-03-18 1993-09-22 Agrolinz Melamin GmbH Urea granules coated with melanin powder
EP0561235A3 (en) * 1992-03-18 1993-11-03 Chemie Linz Gmbh Urea granules coated with melanin powder

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