GB756934A - Process for the production of urea and ammonium carbamate - Google Patents

Process for the production of urea and ammonium carbamate

Info

Publication number
GB756934A
GB756934A GB6491/53A GB649153A GB756934A GB 756934 A GB756934 A GB 756934A GB 6491/53 A GB6491/53 A GB 6491/53A GB 649153 A GB649153 A GB 649153A GB 756934 A GB756934 A GB 756934A
Authority
GB
United Kingdom
Prior art keywords
ammonia
carbon dioxide
pressure
fed
pump
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
GB6491/53A
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.)
Montedison SpA
Original Assignee
Montedison SpA
Montecatini Societa Generale per lIndustria Mineraria e Chimica SpA
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 Montedison SpA, Montecatini Societa Generale per lIndustria Mineraria e Chimica SpA filed Critical Montedison SpA
Publication of GB756934A publication Critical patent/GB756934A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B21/00—Nitrogen; Compounds thereof
    • C01B21/082—Compounds containing nitrogen and non-metals and optionally metals
    • C01B21/12—Carbamic acid or thiocarbamic acid; Salts thereof
    • 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

Abstract

In the production of urea from carbon dioxide, water and excess ammonia under pressure, the vapours produced are expanded and pressure distilled at 20-45 atmospheres pressure, and the resulting carbon dioxide <PICT:0756934/IV(a)/1> and ammonia passed to a condenser at 60-90 DEG C., which is fed with liquid ammonia and up to 25 per cent water. Aqueous urea is withdrawn from the pressure still, and the carbamate, which is condensed free from solid particles is returned to the autoclave at increased pressure. In the Figure, the products from the autoclave 1, which is fed with carbon dioxide through pump 9 and ammonia through pump 11, pass to a pressure still 13 whence the resulting urea solution is collected in a separator 3 and the carbon dioxide and ammonia condensed as carbamate in the chamber 5. The latter is fed with make up ammonia from pump 11 and an aqueous solution from column 6, which is fed with the minimum amount of water to dissolve the ammonia and carbon dioxide leaving the chamber 5. The condensate from the latter is recycled by means of pump 10 heated to a temperature higher than the temperature of crystallization of the carbamate.
GB6491/53A 1952-03-11 1953-03-09 Process for the production of urea and ammonium carbamate Expired GB756934A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT756934X 1952-03-11

Publications (1)

Publication Number Publication Date
GB756934A true GB756934A (en) 1956-09-12

Family

ID=11315808

Family Applications (1)

Application Number Title Priority Date Filing Date
GB6491/53A Expired GB756934A (en) 1952-03-11 1953-03-09 Process for the production of urea and ammonium carbamate

Country Status (1)

Country Link
GB (1) GB756934A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3147304A (en) * 1960-06-21 1964-09-01 Chemical Construction Corp Method for heat recovery in urea synthesis process
EP3330222A1 (en) * 2016-12-01 2018-06-06 Loughborough University Process for reducing nitrogen oxides

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3147304A (en) * 1960-06-21 1964-09-01 Chemical Construction Corp Method for heat recovery in urea synthesis process
EP3330222A1 (en) * 2016-12-01 2018-06-06 Loughborough University Process for reducing nitrogen oxides
US10695719B2 (en) 2016-12-01 2020-06-30 Loughborough University Producing ammonium carbamate and reducing nitrogen oxides

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