GB1508119A - Synthesis of urea - Google Patents

Synthesis of urea

Info

Publication number
GB1508119A
GB1508119A GB6319/77A GB631977A GB1508119A GB 1508119 A GB1508119 A GB 1508119A GB 6319/77 A GB6319/77 A GB 6319/77A GB 631977 A GB631977 A GB 631977A GB 1508119 A GB1508119 A GB 1508119A
Authority
GB
United Kingdom
Prior art keywords
zone
effluent
exchange
rectification
pressure stage
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
GB6319/77A
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.)
Mitsui Toatsu Chemicals Inc
Original Assignee
Mitsui Toatsu Chemicals Inc
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 Mitsui Toatsu Chemicals Inc filed Critical Mitsui Toatsu Chemicals Inc
Publication of GB1508119A publication Critical patent/GB1508119A/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)
  • Lubricants (AREA)

Abstract

1508119 Urea synthesis MITSUI TOATSU CHEMICALS Inc 15 Feb 1977 [2 March 1976] 06319/77 Heading C2C Urea is synthesized from ammonia and carbon dioxide in a process in which (1) the ureasynthesis effluent is subjected to at least two ammonium carbamate decomposition stages including a high pressure stage at greater than 10 kg./cm.<SP>2</SP> and a low pressure stage at below 5 kg./cm.<SP>2</SP>, to separate from the effluent gaseous mixtures composed of ammonia, carbon dioxide and water-vapour, at least a part of the lowpressure separation zone being a rectification zone having a top zone and a bottom zone, (2) these gaseous mixtures are contacted with absorbent at the same pressure as the separation zones, the absorbates are recycled to the ureasynthesis zone, (3) the effluent from the highpressure separation zone is cooled to 105‹ to 170‹ C. by indirect heat-exchange with the effluent present in the bottom zone of the lowpressure rectification zone, (4) the pressure of the cooled effluent is reduced to that of the low-pressure stage and (5) this effluent is introduced into the top zone of the rectification zone and the bottom zone is heated by indirect heat-exchange in the heat-exchange zone and in an additional heating zone to maintain the temperature of the top zone at 60‹ to 120‹ C. and that of the bottom zone at 100‹ to 140‹ C.
GB6319/77A 1976-03-02 1977-02-15 Synthesis of urea Expired GB1508119A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2176076A JPS52105125A (en) 1976-03-02 1976-03-02 Separation and recovery of unreacted material on urea synthesis

Publications (1)

Publication Number Publication Date
GB1508119A true GB1508119A (en) 1978-04-19

Family

ID=12064013

Family Applications (1)

Application Number Title Priority Date Filing Date
GB6319/77A Expired GB1508119A (en) 1976-03-02 1977-02-15 Synthesis of urea

Country Status (16)

Country Link
JP (1) JPS52105125A (en)
AU (1) AU506697B2 (en)
BR (1) BR7701245A (en)
CA (1) CA1072980A (en)
DE (1) DE2708617C2 (en)
EG (1) EG12471A (en)
FR (1) FR2342961A1 (en)
GB (1) GB1508119A (en)
IN (1) IN145548B (en)
IT (1) IT1071312B (en)
MX (1) MX144971A (en)
NL (1) NL7701883A (en)
NO (1) NO150276C (en)
PH (1) PH13083A (en)
PT (1) PT66245B (en)
SU (1) SU810078A3 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3237653A1 (en) * 1981-10-16 1983-05-19 Toyo Engineering Corp., Tokyo METHOD FOR SYNTHETIZING UREA

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5750954A (en) * 1980-09-12 1982-03-25 Mitsui Toatsu Chem Inc Synthesis of urea
GB2089786B (en) * 1980-12-23 1985-02-20 Mitsui Toatsu Chemicals Process for synthesizing urea

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1540732A (en) * 1966-10-14 1968-09-27 Toyo Koatsu Ind Inc Urea synthesis process
GB1217219A (en) * 1967-08-10 1970-12-31 Mitsui Toatsu Chemicals Process for recovering excess ammonia in urea synthesis
JPS4919259B1 (en) * 1969-08-30 1974-05-16
US3824283A (en) * 1970-11-02 1974-07-16 Chemical Construction Corp Urea synthesis process

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3237653A1 (en) * 1981-10-16 1983-05-19 Toyo Engineering Corp., Tokyo METHOD FOR SYNTHETIZING UREA

Also Published As

Publication number Publication date
PT66245B (en) 1978-07-17
FR2342961B1 (en) 1980-10-31
NL7701883A (en) 1977-09-06
AU506697B2 (en) 1980-01-17
CA1072980A (en) 1980-03-04
NO150276C (en) 1984-09-19
NO770672L (en) 1977-09-05
SU810078A3 (en) 1981-02-28
IT1071312B (en) 1985-04-02
AU2250277A (en) 1978-08-31
MX144971A (en) 1981-12-09
EG12471A (en) 1979-09-30
PT66245A (en) 1977-03-01
NO150276B (en) 1984-06-12
DE2708617A1 (en) 1977-09-08
FR2342961A1 (en) 1977-09-30
BR7701245A (en) 1977-12-20
PH13083A (en) 1979-11-23
IN145548B (en) 1978-11-04
DE2708617C2 (en) 1984-11-29
JPS5532703B2 (en) 1980-08-26
JPS52105125A (en) 1977-09-03

Similar Documents

Publication Publication Date Title
US4354040A (en) Process for synthesizing urea
GB1505445A (en) Synthesis of urea
SU833158A3 (en) Method of urea and ammonia synthesis
ES2000389A6 (en) Process for the preparation of urea.
ES2000605A6 (en) Process for the preparation of urea.
GB1148767A (en) Process for the production of melamine
ES422910A1 (en) Method of recovering unreacted ammonium carbamate in urea synthesis
GB1508119A (en) Synthesis of urea
GB1247951A (en) Process for preparing melamine from urea
GB1143332A (en) Synthesis of chemical compounds. particularly ammonia from gaseous reactants
US3711544A (en) Heat recovery in urea synthesis
ES8404676A1 (en) Process for the production of urea
US3357901A (en) Ammonia, carbon dioxide recovery from urea synthesis utilizing an ejector
US2046827A (en) Production of urea and nitrogen oxides
ES443998A1 (en) Treatment of water vapor generated in concentrating an aqueous urea solution
IE35308B1 (en) Process for the production of urea
ZA864404B (en) Process of recovering ammonia from an aqueous effluent which contains nh3,co2 and h2s
GB1320950A (en) Process for the preparation of urea and melamine
ES8606303A1 (en) Production of melamine
ES8104141A1 (en) Process for the separation of ammonia and carbon dioxide from mixtures containing ammonia, carbon dioxide and water.
US3107149A (en) Method of separating ammonia from carbon dioxide
GB1214591A (en) Method for synthesizing urea
GB981641A (en) Production of urea
GB1501038A (en) Synthesis of urea
GB1148991A (en) Process for synthesising urea

Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee