GB913442A - Improvements in or relating to the preparation of urea suitable for granulation - Google Patents

Improvements in or relating to the preparation of urea suitable for granulation

Info

Publication number
GB913442A
GB913442A GB3481560A GB3481560A GB913442A GB 913442 A GB913442 A GB 913442A GB 3481560 A GB3481560 A GB 3481560A GB 3481560 A GB3481560 A GB 3481560A GB 913442 A GB913442 A GB 913442A
Authority
GB
United Kingdom
Prior art keywords
solution
counter
current
air
temperature
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
GB3481560A
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 GB913442A publication Critical patent/GB913442A/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
    • 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
    • B01J2/02—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops

Landscapes

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

Abstract

An aqueous urea solution is evaporated to produce a urea melt having a low biuret concentration by drying said solution at elevated temperatures in the form of a thin film in a normal tubular falling film evaporator, without additional mechanical means and in the presence of a counter-current of air. The aqueous solution is preferably evaporated at a temperature of between 125 DEG and 150 DEG C. and the counter-current of air is preferably pre-heated to a temperature of between 130 DEG and 160 DEG C. A suitable evaporator consists of a number of upright parallel heated tubes, over the internal surface of which the solution passes. Specification 767,716 is referred to.
GB3481560A 1959-10-12 1960-10-11 Improvements in or relating to the preparation of urea suitable for granulation Expired GB913442A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH7931159A CH376092A (en) 1959-10-12 1959-10-12 Process for the gentle evaporation of urea solutions for the purpose of obtaining a low-biuret urea

Publications (1)

Publication Number Publication Date
GB913442A true GB913442A (en) 1962-12-19

Family

ID=4537115

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3481560A Expired GB913442A (en) 1959-10-12 1960-10-11 Improvements in or relating to the preparation of urea suitable for granulation

Country Status (2)

Country Link
CH (1) CH376092A (en)
GB (1) GB913442A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006096048A1 (en) * 2005-03-09 2006-09-14 Dsm Ip Assets B.V. Process for the preparation of a urea-comprising aqueous stream
CN113101682A (en) * 2021-05-28 2021-07-13 新疆心连心能源化工有限公司 Device for reducing evaporation of condensation compound and stabilizing urea production and treatment method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006096048A1 (en) * 2005-03-09 2006-09-14 Dsm Ip Assets B.V. Process for the preparation of a urea-comprising aqueous stream
EA012449B1 (en) * 2005-03-09 2009-10-30 ДСМ АйПи АССЕТС Б.В. Process for the preparation of a urea-comprising aqueous stream
AU2006221182B2 (en) * 2005-03-09 2011-09-29 Stamicarbon B.V. Process for the preparation of a urea-comprising aqueous stream
CN113101682A (en) * 2021-05-28 2021-07-13 新疆心连心能源化工有限公司 Device for reducing evaporation of condensation compound and stabilizing urea production and treatment method

Also Published As

Publication number Publication date
CH376092A (en) 1964-03-31

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