IT1038067B - Urea synthesis from carbon dioxide and ammonia - recovers urea from vapours of urea concentration stage to avoid pollution - Google Patents

Urea synthesis from carbon dioxide and ammonia - recovers urea from vapours of urea concentration stage to avoid pollution

Info

Publication number
IT1038067B
IT1038067B IT2332475A IT2332475A IT1038067B IT 1038067 B IT1038067 B IT 1038067B IT 2332475 A IT2332475 A IT 2332475A IT 2332475 A IT2332475 A IT 2332475A IT 1038067 B IT1038067 B IT 1038067B
Authority
IT
Italy
Prior art keywords
urea
pref
condensate
vapours
water
Prior art date
Application number
IT2332475A
Other languages
Italian (it)
Inventor
Chikaoka Sadashi
Miyakawa Hisashi
Kawabe Toyotaro
Seki Naotoshi
Original Assignee
Mitsui Toatsu Chemicals
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 filed Critical Mitsui Toatsu Chemicals
Priority to IT2332475A priority Critical patent/IT1038067B/en
Application granted granted Critical
Publication of IT1038067B publication Critical patent/IT1038067B/en

Links

Landscapes

  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

Urea prepn. from CO2 and NH3 under pressure is by passing the prod. through several NH4 carbamate decompsn stages with gradual reduction of pressure to decompose and separate unreacted NH4 carbamate, them contg. the urea soln., pref. at 60-200 mm Hg pressure. The exit vapours from the concn. stage contg. water, entrained urea, NH3 and CO2 are sepd. to form a 1st condensate of urea, CO2 and NH3, and a 2nd condensate contg. the rest of the CO2 and NH3. The 2nd condensate is distilled to recover CO2 and NH3 gas and water. A pre-condensation may pref. be carried out before the 1st condensation stage by indirect cooling. The 2nd condensation is pref. carried out in two stages. The 1st condensate is pref. used as a water wash in the urea process, partic. for the exit dust from the urea pastille formation stage, which is thereafter passed through a resinous filter. Loss of urea and water pollution are avoided.
IT2332475A 1975-05-14 1975-05-14 Urea synthesis from carbon dioxide and ammonia - recovers urea from vapours of urea concentration stage to avoid pollution IT1038067B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
IT2332475A IT1038067B (en) 1975-05-14 1975-05-14 Urea synthesis from carbon dioxide and ammonia - recovers urea from vapours of urea concentration stage to avoid pollution

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT2332475A IT1038067B (en) 1975-05-14 1975-05-14 Urea synthesis from carbon dioxide and ammonia - recovers urea from vapours of urea concentration stage to avoid pollution

Publications (1)

Publication Number Publication Date
IT1038067B true IT1038067B (en) 1979-11-20

Family

ID=11206070

Family Applications (1)

Application Number Title Priority Date Filing Date
IT2332475A IT1038067B (en) 1975-05-14 1975-05-14 Urea synthesis from carbon dioxide and ammonia - recovers urea from vapours of urea concentration stage to avoid pollution

Country Status (1)

Country Link
IT (1) IT1038067B (en)

Similar Documents

Publication Publication Date Title
GB1505445A (en) Synthesis of urea
YU284782A (en) Process for the manufacture of melamine by means of catalytic conversion of carbamide in the presence of gaseous nh3 or an nh3containing gaseous mixture
DE69806475T2 (en) METHOD FOR PRODUCING UREA
JPS5750954A (en) Synthesis of urea
GB1365707A (en) Process for preparing urea
ATE102848T1 (en) PROCESS FOR DENOXIFICATION OF EXHAUST GASES WITH PRODUCTION OF HNO3.
DK147496B (en) INTEGRATED AMMONIAK URINATE PROCEDURE FOR THE MANUFACTURING OF URINE
DE69719850T2 (en) Process for the production of melamine
EA011376B1 (en) Process for the preparation of urea
IT1038067B (en) Urea synthesis from carbon dioxide and ammonia - recovers urea from vapours of urea concentration stage to avoid pollution
US3984469A (en) Process for the production of urea
ATE101123T1 (en) INTEGRATED PROCESS FOR THE PRODUCTION OF AMINOACETONITRILENES.
GB1333897A (en) Process for removing sulphur dioxide from a gas
ATA507479A (en) Two=stage thermal treatment of urea soln. - from synthesis reactor, removing most ammonia in first stage, and decomposing carbamate in second (NL 28.1.80)
GB1247951A (en) Process for preparing melamine from urea
GB1453422A (en) Synthesis of urea
JPS5446830A (en) Pesticide for plant viral disease
CA1094104A (en) Process for preparing a urea solution from nh.sub.3 and co.sub.2
ES443998A1 (en) Treatment of water vapor generated in concentrating an aqueous urea solution
ATE7905T1 (en) PROCESS FOR PRODUCTION OF UREA.
US4137262A (en) Process for the production of urea
US3107149A (en) Method of separating ammonia from carbon dioxide
GB808234A (en) Improvements in or relating to processes for the manufacture of nitric acid by catalytic combustion of ammonia
DE60113158D1 (en) PROCESS FOR THE PREPARATION OF ASCORBIC ACID IN THE PRESENCE OF A SULFIT
GB1272873A (en) Process for the production of urea