Title:
METHOD FOR PRODUCING ISOCYANATE
Document Type and Number:
WIPO Patent Application WO/2014/157636
Kind Code:
A1
Abstract:
A method for producing isocyanate, said method comprising: a carbamation step for producing an N-substituted carbamate by a carbamation reaction using an organic primary amine, urea and an organic hydroxy compound, and then collecting first vapor phase components containing urea and/or a compound having carbonyl group that is derived from urea, the organic hydroxy compound and ammonia; a condensation step for condensing the first vapor phase components in a condenser; an isocyanate production step for thermally decomposing the N-substituted carbamate to produce isocyanate; an ammonia absorption step for allowing water for absorption to absorb second vapor phase components comprising ammonia as the main component, said second vapor phase components being collected as vapor components from the condenser, to give gas-absorbed water; and an ammonia diffusion step for heating the gas-absorbed water and thus separating ammonia from the gas-absorbed water.
Inventors:
SHINOHATA MASAAKI (JP)
TAKEUCHI KOUJI (JP)
FUJIMOTO NAOKI (JP)
MIYAKE NOBUHISA (JP)
TAKEUCHI KOUJI (JP)
FUJIMOTO NAOKI (JP)
MIYAKE NOBUHISA (JP)
Application Number:
PCT/JP2014/059187
Publication Date:
October 02, 2014
Filing Date:
March 28, 2014
Export Citation:
Assignee:
ASAHI KASEI CHEMICALS CORP (JP)
International Classes:
C07C263/04; C07C263/20; C07C265/14; C07C269/04; C07C271/06
Domestic Patent References:
| WO2012115110A1 | 2012-08-30 | |||
| WO2011021258A1 | 2011-02-24 | |||
| WO2011158598A1 | 2011-12-22 | |||
| WO2011078000A1 | 2011-06-30 | |||
| WO2011158598A1 | 2011-12-22 | |||
| WO2007036479A1 | 2007-04-05 | |||
| WO2008059953A1 | 2008-05-22 |
Foreign References:
| JPH06115928A | 1994-04-26 | |||
| JPH05310677A | 1993-11-22 | |||
| JP2009510015A | 2009-03-12 | |||
| JPH06115928A | 1994-04-26 | |||
| JPH0641045A | 1994-02-15 | |||
| JPH05310677A | 1993-11-22 |
Other References:
"Yuki Kagaku/Seikagaku Meimeihou (Nomenclature of Organic Chemistry/Biochemistry", 1992, NANKODO CO., LTD.
See also references of EP 2980066A4
See also references of EP 2980066A4
Attorney, Agent or Firm:
HASEGAWA Yoshiki et al. (JP)
Yoshiki Hasegawa (JP)
Yoshiki Hasegawa (JP)
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