GB844294A - Improvements relating to the production of granulated urea - Google Patents

Improvements relating to the production of granulated urea

Info

Publication number
GB844294A
GB844294A GB37404/58A GB3740458A GB844294A GB 844294 A GB844294 A GB 844294A GB 37404/58 A GB37404/58 A GB 37404/58A GB 3740458 A GB3740458 A GB 3740458A GB 844294 A GB844294 A GB 844294A
Authority
GB
United Kingdom
Prior art keywords
ammonia
urea
carbon dioxide
aqueous
treatment
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
GB37404/58A
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
Priority claimed from CH6542358A external-priority patent/CH369443A/en
Application filed by Inventa AG fuer Forschung und Patentverwertung filed Critical Inventa AG fuer Forschung und Patentverwertung
Publication of GB844294A publication Critical patent/GB844294A/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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
    • B01J2/30—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic using agents to prevent the granules sticking together; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
    • C01C1/00—Ammonia; Compounds thereof
    • C01C1/02—Preparation, purification or separation of ammonia
    • C01C1/12—Separation of ammonia from gases and vapours
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05C—NITROGENOUS FERTILISERS
    • C05C3/00—Fertilisers containing other salts of ammonia or ammonia itself, e.g. gas liquor

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Analytical Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

A process for the manufacture of urea in granular form from ammonia and carbon dioxide in which the residual gas from the synthesis, containing ammonia, carbon dioxide, water and inert gases, is worked up by selective absorption of the ammonia and the ammonia and carbon dioxide are separately returned to the process, is characterised by the feature that after removal of the greater part of the ammonia, the residual ammonia remaining in the gas mixture is partly or completly washed out with aqueous sulphuric acid and is obtained as an aqueous ammonium sulphate solution, which is added to the originally produced aqueous solution of urea, after which the mixture is concentrated and granulated. Preferably the ammonia is selectively absorbed by treatment with ammonium nitrate solution; the amount of ammonia so absorbed is preferably adjusted by altering the absorption conditions in such a way that the treatment with aqueous sulphuric acid produces as much ammonium sulphate as is necessary, when mixed with the urea, to give a concentration of 3-20%. Any excess of ammonia may then be removed by water washing.
GB37404/58A 1957-11-21 1958-11-20 Improvements relating to the production of granulated urea Expired GB844294A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH844294X 1957-11-21
CH6542358A CH369443A (en) 1958-10-24 1958-10-24 Process for the production of stabilized urea

Publications (1)

Publication Number Publication Date
GB844294A true GB844294A (en) 1960-08-10

Family

ID=25737841

Family Applications (1)

Application Number Title Priority Date Filing Date
GB37404/58A Expired GB844294A (en) 1957-11-21 1958-11-20 Improvements relating to the production of granulated urea

Country Status (2)

Country Link
GB (1) GB844294A (en)
NL (1) NL106294C (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0629611A1 (en) * 1993-06-09 1994-12-21 SNAMPROGETTI S.p.A. Process for reducing the ammonia content of a gaseous effluent from urea production plants
EP2386346A1 (en) 2010-05-11 2011-11-16 Stamicarbon B.V. Process for the reduction of ammonia emissions in a urea manufacturing process
US20120039787A1 (en) * 2009-01-13 2012-02-16 Saipem S.P.A Process for the recovery of ammonia from a gaseous stream
EP2477961B1 (en) 2009-09-16 2016-04-20 Stamicarbon B.V. Removal of urea and ammonia from exhaust gases
IT201600115907A1 (en) * 2016-11-16 2018-05-16 Saipem Spa INTEGRATED PROCESS AND PLANT FOR THE PRODUCTION OF UREA AND UAS MIXTURE (UREA-AMONIO SULFATE)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5527961A (en) * 1993-06-09 1996-06-18 Snamprogetti S.P.A. Process for reducing the ammonia content of a gaseous effluent from urea production plants
CN1053890C (en) * 1993-06-09 2000-06-28 斯南普罗吉蒂联合股票公司 Process for reducing the ammonia content of a gaseous effluent from urea production plants
EP0629611A1 (en) * 1993-06-09 1994-12-21 SNAMPROGETTI S.p.A. Process for reducing the ammonia content of a gaseous effluent from urea production plants
US20120039787A1 (en) * 2009-01-13 2012-02-16 Saipem S.P.A Process for the recovery of ammonia from a gaseous stream
US8758485B2 (en) * 2009-01-13 2014-06-24 Saipem S.P.A. Process for the recovery of ammonia from a gaseous stream
US10640428B2 (en) 2009-09-16 2020-05-05 Stamicarbon B.V. Removal of urea and ammonia from exhaust gases
EP2477961B1 (en) 2009-09-16 2016-04-20 Stamicarbon B.V. Removal of urea and ammonia from exhaust gases
EP2477961B2 (en) † 2009-09-16 2023-12-06 Stamicarbon B.V. Removal of urea and ammonia from exhaust gases
EP2386346A1 (en) 2010-05-11 2011-11-16 Stamicarbon B.V. Process for the reduction of ammonia emissions in a urea manufacturing process
JP2019537606A (en) * 2016-11-16 2019-12-26 サイペム エスピーアー Integrated process and plant for the production of urea and UAS (urea-ammonium sulfate) mixtures
WO2018092057A1 (en) * 2016-11-16 2018-05-24 Saipem S.P.A. Integrated process and plant for production of urea and uas (urea-ammonium sulphate) mixtures
US10870584B2 (en) 2016-11-16 2020-12-22 Saipem S.P.A. Integrated process and plant for production of urea and UAS (urea-ammonium sulphate) mixtures
IT201600115907A1 (en) * 2016-11-16 2018-05-16 Saipem Spa INTEGRATED PROCESS AND PLANT FOR THE PRODUCTION OF UREA AND UAS MIXTURE (UREA-AMONIO SULFATE)

Also Published As

Publication number Publication date
NL106294C (en)

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