Title:
METHOD FOR PRODUCING ISOCYANATE
Document Type and Number:
WIPO Patent Application WO/2021/100131
Kind Code:
A1
Abstract:
This isocyanate production method, for continuously producing an isocyanate while suppressing side reactions, is a method for producing an isocyanate through the thermal decomposition of carbamate, and comprises: a thermal decomposition step in which a mixed solution containing carbamate and a compound (A) having a specific structure is continuously put into a pyrolysis reactor and carry out a pyrolysis reaction of carbamate; a low-boiling-point decomposition product recovery step in which a low-boiling-point decomposition product having a lower standard boiling point than the compound (A) is continuously extracted in a gaseous form from the pyrolysis reactor; and a high-boiling-point component recovery step in which a liquid phase component, which is not recovered in a gaseous form in the low-boiling-point decomposition product recovery step, is continuously extracted as a high-boiling-point component from the pyrolysis reactor.
Inventors:
TAKAGAKI KAZUHIRO (JP)
IWATA YUSUKE (JP)
SHINOHATA MASAAKI (JP)
NAKAOKA KOICHI (JP)
SAKURAI YUSUKE (JP)
IWATA YUSUKE (JP)
SHINOHATA MASAAKI (JP)
NAKAOKA KOICHI (JP)
SAKURAI YUSUKE (JP)
Application Number:
PCT/JP2019/045351
Publication Date:
May 27, 2021
Filing Date:
November 20, 2019
Export Citation:
Assignee:
ASAHI CHEMICAL IND (JP)
International Classes:
C07C263/04; C07C265/04; C07C265/14; C07C323/57
Domestic Patent References:
| WO2018212208A1 | 2018-11-22 | |||
| WO2008084824A1 | 2008-07-17 | |||
| WO2009139061A1 | 2009-11-19 |
Foreign References:
| JP2019199431A | 2019-11-21 | |||
| JP2019199418A | 2019-11-21 | |||
| JP2019199420A | 2019-11-21 | |||
| JP2019199422A | 2019-11-21 | |||
| JPH02212465A | 1990-08-23 | |||
| JPS60231640A | 1985-11-18 | |||
| JP2003252846A | 2003-09-10 | |||
| JP2012233014A | 2012-11-29 |
Other References:
BERCHTE DER DEUTECHEN CHEMISCHENGESELLSCHAFT, vol. 3, 8 January 1970 (1970-01-08), pages 653
JOURNAL OF AMERICAN CHEMICAL SOCIETY, vol. 81, 1959, pages 2138
See also references of EP 4063347A4
JOURNAL OF AMERICAN CHEMICAL SOCIETY, vol. 81, 1959, pages 2138
See also references of EP 4063347A4
Attorney, Agent or Firm:
TANAI Sumio et al. (JP)
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