GB1196657A - Process for the Manufacture of Urea from Ammonia and Carbon Dioxide - Google Patents

Process for the Manufacture of Urea from Ammonia and Carbon Dioxide

Info

Publication number
GB1196657A
GB1196657A GB4409767A GB4409767A GB1196657A GB 1196657 A GB1196657 A GB 1196657A GB 4409767 A GB4409767 A GB 4409767A GB 4409767 A GB4409767 A GB 4409767A GB 1196657 A GB1196657 A GB 1196657A
Authority
GB
United Kingdom
Prior art keywords
urea
ammonia
synthesis
distillation zone
carbamate
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
GB4409767A
Inventor
Guido Giommi
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB4409767A priority Critical patent/GB1196657A/en
Publication of GB1196657A publication Critical patent/GB1196657A/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

1,196,657. Urea. G. GIOMMI. 28 Sept., 1967, No. 44097/67. Heading C2C. A continuous process for the synthesis of urea from ammonia and carbon dioxide under elevated temperatures and pressures comprises the step of splitting the ammonium, carbonate which is not converted into urea into its components by distillation at temperatures and pressures approximately equal to synthesis pressures and temperatures in the presence of an excess quantity of gaseous ammonia, the split products being readmitted to the urea synthesis and the urea being drawn off from the distillation zone, the improvement comprising condensing the split products withdrawn from said distillation zone so as to form liquid carbamate and separating the same from said excess ammonia, returning said carbamate into the urea synthesis, recirculating said ammonia into the distillation zone, and adding at least a portion of the CO 2 used in the synthesis to the gases withdrawn from the distillation zone before their condensation. The gases withdrawn from the distillation zone may be condensed with the simultaneous addition of small quantities of water sufficient to prevent the precipitation of the condensed carbamate. The recirculated excess ammonia, which may be further compressed and separated from inert components, may be admitted to the distillation zone together with at least a part of the total ammonia charged into the synthesis. Suitable forms of apparatus for carrying out the above process are described.
GB4409767A 1967-09-28 1967-09-28 Process for the Manufacture of Urea from Ammonia and Carbon Dioxide Expired GB1196657A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4409767A GB1196657A (en) 1967-09-28 1967-09-28 Process for the Manufacture of Urea from Ammonia and Carbon Dioxide

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4409767A GB1196657A (en) 1967-09-28 1967-09-28 Process for the Manufacture of Urea from Ammonia and Carbon Dioxide

Publications (1)

Publication Number Publication Date
GB1196657A true GB1196657A (en) 1970-07-01

Family

ID=10431768

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4409767A Expired GB1196657A (en) 1967-09-28 1967-09-28 Process for the Manufacture of Urea from Ammonia and Carbon Dioxide

Country Status (1)

Country Link
GB (1) GB1196657A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5750780A (en) * 1995-06-30 1998-05-12 Snamprogetti S.P.A. Process for the synthesis of urea comprising two separate reaction zones
US6342632B1 (en) 1995-02-01 2002-01-29 Urea Casale Process and plant for the production of urea with high conversion yield and low energy consumption

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6730278B2 (en) 1995-01-27 2004-05-04 Urea Casale Process and plant for the production of urea with high conversion yield and low energy consumption
US6342632B1 (en) 1995-02-01 2002-01-29 Urea Casale Process and plant for the production of urea with high conversion yield and low energy consumption
EP0796244B2 (en) † 1995-02-01 2003-03-05 Urea Casale S.A. Process and plant for the production of urea with high conversion yield and low energy consumption
US5750780A (en) * 1995-06-30 1998-05-12 Snamprogetti S.P.A. Process for the synthesis of urea comprising two separate reaction zones

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Legal Events

Date Code Title Description
PS Patent sealed
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PE20 Patent expired after termination of 20 years