GB145060A - Improvements in the manufacture and production of urea - Google Patents

Improvements in the manufacture and production of urea

Info

Publication number
GB145060A
GB145060A GB16211/20A GB1621120A GB145060A GB 145060 A GB145060 A GB 145060A GB 16211/20 A GB16211/20 A GB 16211/20A GB 1621120 A GB1621120 A GB 1621120A GB 145060 A GB145060 A GB 145060A
Authority
GB
United Kingdom
Prior art keywords
urea
ammonia
carbon dioxide
autoclave
melt
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
GB16211/20A
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.)
BASF SE
Original Assignee
BASF SE
Badische Anilin and Sodafabrik AG
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 BASF SE, Badische Anilin and Sodafabrik AG filed Critical BASF SE
Publication of GB145060A publication Critical patent/GB145060A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • C07C273/04—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 from carbon dioxide and ammonia

Landscapes

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

Abstract

Urea is prepared by forcing a mixture of carbon dioxide and ammonia into an autoclave and maintaining the melt formed for a sufficient time at the temperature required for the transformation of ammonium carbamate into urea. The process is carried out in a continuous manner by forcing the gases into the autoclave and keeping the melt at 135 DEG C. for two hours, then slowly releasing the reaction mass through a bottom valve to a column still in which it is distilled, urea solution running off from the bottom of the still, while unchanged ammonia and carbon dioxide pass off to a dephlegmator and thence back to the compressor. More ammonia and carbon dioxide are supplied to the autoclave, or an aqueous solution of ammonium carbamate or carbonate is supplied to the top of the column still. The amount of moisture in the gases led back to the compressor may be controlled by keeping the temperature at the outlet of the p dephlegmator at, say, 60 DEG C. The expansion of the melt may be allowed to take place in two stages to save compression energy. The Specification as open to inspection under Sect. 91 (3) (a) refers also to the production of urea from ammonia and carbon dioxide otherwise than by the continuous process described. This subject-matter does not appear in the Specification as accepted.
GB16211/20A 1916-08-09 1920-06-15 Improvements in the manufacture and production of urea Expired GB145060A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE145060X 1916-08-09

Publications (1)

Publication Number Publication Date
GB145060A true GB145060A (en) 1921-05-19

Family

ID=5670562

Family Applications (1)

Application Number Title Priority Date Filing Date
GB16211/20A Expired GB145060A (en) 1916-08-09 1920-06-15 Improvements in the manufacture and production of urea

Country Status (2)

Country Link
DE (1) DE301279C (en)
GB (1) GB145060A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3406200A (en) * 1959-12-31 1968-10-15 Montedison Spa Urea manufacture

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3406200A (en) * 1959-12-31 1968-10-15 Montedison Spa Urea manufacture

Also Published As

Publication number Publication date
DE301279C (en)

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