JPS55145659A - Concentration of aqueous solution of urea - Google Patents

Concentration of aqueous solution of urea

Info

Publication number
JPS55145659A
JPS55145659A JP5251979A JP5251979A JPS55145659A JP S55145659 A JPS55145659 A JP S55145659A JP 5251979 A JP5251979 A JP 5251979A JP 5251979 A JP5251979 A JP 5251979A JP S55145659 A JPS55145659 A JP S55145659A
Authority
JP
Japan
Prior art keywords
urea
gas stream
hot gas
concentration
aqueous solution
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.)
Pending
Application number
JP5251979A
Other languages
Japanese (ja)
Inventor
Michio Nobue
Akito Fukui
Yoshio Yamamoto
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
Toyo Engineering Corp
Original Assignee
Mitsui Toatsu Chemicals Inc
Toyo Engineering Corp
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, Toyo Engineering Corp filed Critical Mitsui Toatsu Chemicals Inc
Priority to JP5251979A priority Critical patent/JPS55145659A/en
Priority to GB8039154A priority patent/GB2061948B/en
Priority to BR8007228A priority patent/BR8007228A/en
Priority to PCT/JP1980/000088 priority patent/WO1980002425A1/en
Priority to IN565/CAL/80A priority patent/IN152760B/en
Publication of JPS55145659A publication Critical patent/JPS55145659A/en
Pending 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

Landscapes

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

Abstract

PURPOSE: To concentrate an aqueous solution of urea, economically, suppressing the hydrolysis of urea and formation of biuret, by concentrating the urea solution in vacuum, and then concentrating under hot gas stream.
CONSTITUTION: An aqueous solution of urea is introduced from a purifying system 1 into a vacuum evaporator 3, and concentrated to a concentration of 95W99wt% under 40W300mmHg, pref. 60W120mmHg abs. The steam evaporated in the vacuum evaporator 3 in condensed in a condenser 8. The concentrated urea solution is fed to a hot gas stream dryer 13 through lines 6 and 12, and made to contact countercurrently with hot gas stream exhausted from the line 14 to the line 16. The urea dried to the concentration of ≥99.5wt% is obtained from the line 15. The drying in the hot gas stream dryer is carried out under the atmospheric pressure, at 135W 200°C, pref. 150W170°C. The process has the combined advantages of the vacuum concentration and the hot gas stream drying.
COPYRIGHT: (C)1980,JPO&Japio
JP5251979A 1979-05-01 1979-05-01 Concentration of aqueous solution of urea Pending JPS55145659A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP5251979A JPS55145659A (en) 1979-05-01 1979-05-01 Concentration of aqueous solution of urea
GB8039154A GB2061948B (en) 1979-05-01 1980-04-25 Process for concentrating aqueous urea solution
BR8007228A BR8007228A (en) 1979-05-01 1980-04-25 PROCESS FOR CONCENTRATION OF AQUEOUS UREA SOLUTION
PCT/JP1980/000088 WO1980002425A1 (en) 1979-05-01 1980-04-25 Process for concentrating aqueous urea solution
IN565/CAL/80A IN152760B (en) 1979-05-01 1980-05-12

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5251979A JPS55145659A (en) 1979-05-01 1979-05-01 Concentration of aqueous solution of urea

Publications (1)

Publication Number Publication Date
JPS55145659A true JPS55145659A (en) 1980-11-13

Family

ID=12916980

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5251979A Pending JPS55145659A (en) 1979-05-01 1979-05-01 Concentration of aqueous solution of urea

Country Status (4)

Country Link
JP (1) JPS55145659A (en)
GB (1) GB2061948B (en)
IN (1) IN152760B (en)
WO (1) WO1980002425A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH679485A5 (en) * 1989-12-29 1992-02-28 Ammonia Casale Sa

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS497141A (en) * 1972-05-13 1974-01-22

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL141179B (en) * 1967-01-20 1974-02-15 Whitlock Mfg Co METHOD AND EQUIPMENT FOR THE PREPARATION OF UREA.
GB1235055A (en) * 1967-01-20 1971-06-09 Whitlock Mfg Company Process for drying urea solutions
JPS51101919A (en) * 1975-03-07 1976-09-08 Toyo Engineering Corp NYOSOSUI YOEKINONOSHUKUHOHO

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS497141A (en) * 1972-05-13 1974-01-22

Also Published As

Publication number Publication date
IN152760B (en) 1984-03-31
GB2061948A (en) 1981-05-20
GB2061948B (en) 1983-08-24
WO1980002425A1 (en) 1980-11-13

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