GB1124868A - Preparation of urea - Google Patents

Preparation of urea

Info

Publication number
GB1124868A
GB1124868A GB1569767A GB1569767A GB1124868A GB 1124868 A GB1124868 A GB 1124868A GB 1569767 A GB1569767 A GB 1569767A GB 1569767 A GB1569767 A GB 1569767A GB 1124868 A GB1124868 A GB 1124868A
Authority
GB
United Kingdom
Prior art keywords
synthesis
urea
ammonia
expulsion
reaction
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
GB1569767A
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.)
Inventa AG fuer Forschung und Patentverwertung
Original Assignee
Inventa AG fuer Forschung und Patentverwertung
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 Inventa AG fuer Forschung und Patentverwertung filed Critical Inventa AG fuer Forschung und Patentverwertung
Publication of GB1124868A publication Critical patent/GB1124868A/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
    • C07C273/14—Separation; Purification; Stabilisation; Use of additives
    • C07C273/16—Separation; Purification
    • 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 extracted from the synthesis mixture obtained in the synthesis of urea from ammonia and carbon dioxide in a synthesis reaction vessel at elevated temperature and pressure by expelling the products contained therein which have not been converted into urea at a pressure of 100-300 atmospheres with a gas mixture which, before the expulsion commences, consists in larger part by volume of carrier gases which are inert as regards the urea synthesis and in smaller part by volume of ammonia or carbon dioxide. The expulsion process may be carried out either in a separate apparatus to which the synthesis mixture is fed from the reaction vessel or in the reaction vessel itself, suitable inert gases being nitrogen, hydrogen and mixtures thereof. The inert carrier gas may be circulated, in which case unconverted reaction constituents may be partially stripped off in an after-connected absorber condenser with approximately total absorption of one of the reaction constituents, while part of the other reaction constituent is recirculated again with the carrier gas to the expulsion apparatus. The present process may be operated in conjunction with an ammonia synthesis process wherein, for example, the gas mixture obtained in the ammonia synthesis may be withdrawn before or after partial separation of the ammonia and may then be returned to the ammonia synthesis as a charging gas after passing through the expulsion and stripping apparatus of the present urea extraction. Suitable forms of apparatus are described for both batchwise and continuous operation of the process of the present invention.
GB1569767A 1966-04-05 1967-04-05 Preparation of urea Expired GB1124868A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH499766A CH468356A (en) 1966-04-05 1966-04-05 Process for working up the synthesis mixture obtained in the synthesis of urea from ammonia and carbon dioxide in a synthesis reactor at elevated pressure and elevated temperature

Publications (1)

Publication Number Publication Date
GB1124868A true GB1124868A (en) 1968-08-21

Family

ID=4286155

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1569767A Expired GB1124868A (en) 1966-04-05 1967-04-05 Preparation of urea

Country Status (7)

Country Link
AT (1) AT272360B (en)
BE (1) BE684673A (en)
CH (1) CH468356A (en)
DE (1) DE1568845A1 (en)
DK (1) DK118013B (en)
GB (1) GB1124868A (en)
NL (1) NL6704780A (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3666807A (en) * 1968-02-12 1972-05-30 Sumitomo Chemical Co Process for producing urea
JPS5189B1 (en) * 1970-03-12 1976-01-05
US3984469A (en) * 1969-10-16 1976-10-05 Snam Progetti S.P.A. Process for the production of urea
WO1983000862A1 (en) * 1981-09-01 1983-03-17 Van Nassau, Petrus, Johannes, Marie Process for the preparation of urea
WO1983000861A1 (en) * 1981-09-01 1983-03-17 Van Nassau, Petrus, Johannes, Marie Process for the preparation of urea
GB2167066A (en) * 1984-11-02 1986-05-21 Toyo Engineering Corp Process for producing urea
EP0569629A1 (en) * 1992-05-11 1993-11-18 Union Oil Company of California, dba UNOCAL Method for producing acidic urea solutions
US10280097B2 (en) 2011-04-25 2019-05-07 Oasys Water LLC Osmotic separation systems and methods
US10315936B2 (en) 2009-10-28 2019-06-11 Oasys Water LLC Forward osmosis separation processes
US10315163B2 (en) 2009-10-30 2019-06-11 Oasys Water LLC Osmotic separation systems and methods

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL156686B (en) * 1968-03-16 1978-05-16 Stamicarbon PROCEDURE FOR THE PREPARATION OF UREA IN COMBINATION WITH THE SYNTHESIS OF AMMONIA.
IT1068268B (en) * 1976-09-09 1985-03-21 Snam Progetti PROCEDURE FOR THE PRODUCTION OF UREA AND PURIFICATION OF WATERS

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3666807A (en) * 1968-02-12 1972-05-30 Sumitomo Chemical Co Process for producing urea
US3984469A (en) * 1969-10-16 1976-10-05 Snam Progetti S.P.A. Process for the production of urea
JPS5189B1 (en) * 1970-03-12 1976-01-05
WO1983000862A1 (en) * 1981-09-01 1983-03-17 Van Nassau, Petrus, Johannes, Marie Process for the preparation of urea
WO1983000861A1 (en) * 1981-09-01 1983-03-17 Van Nassau, Petrus, Johannes, Marie Process for the preparation of urea
US4540813A (en) * 1981-09-01 1985-09-10 Unie Van Kunstmestfabrieken B.V. Process for the preparation of urea
GB2167066A (en) * 1984-11-02 1986-05-21 Toyo Engineering Corp Process for producing urea
EP0569629A1 (en) * 1992-05-11 1993-11-18 Union Oil Company of California, dba UNOCAL Method for producing acidic urea solutions
US10315936B2 (en) 2009-10-28 2019-06-11 Oasys Water LLC Forward osmosis separation processes
US10315163B2 (en) 2009-10-30 2019-06-11 Oasys Water LLC Osmotic separation systems and methods
US10280097B2 (en) 2011-04-25 2019-05-07 Oasys Water LLC Osmotic separation systems and methods

Also Published As

Publication number Publication date
NL6704780A (en) 1967-10-06
DK118013B (en) 1970-06-29
BE684673A (en) 1967-01-03
DE1568845A1 (en) 1972-04-13
AT272360B (en) 1969-07-10
CH468356A (en) 1969-02-15

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