Title:
METHOD FOR PRODUCING ISOCYANATE
Document Type and Number:
Japanese Patent JP2019199429
Kind Code:
A
Abstract:
To provide a method for producing isocyanate that suppresses a side reaction and continuously produces isocyanate.SOLUTION: The present invention provides a method for producing isocyanate by pyrolysis of carbamate, the method including: a pyrolysis step in which a liquid mixture containing carbamate and a compound (A) having a unit represented by general formula (4) is continuously introduced into a pyrolytic reactor for a pyrolytic reaction of carbamate; a low-boiling-point pyrolytic product recovery step in which a low-boiling-point pyrolytic product having a normal boiling point lower than that of the compound (A) is continuously extracted in a gas state from the pyrolytic reactor; and a high-boiling-point component recovery step in which a liquid phase component, which has not been recovered in a gas state in the low-boiling-point pyrolytic product recovery step, is continuously extracted as a high-boiling-point component from the pyrolytic reactor.SELECTED DRAWING: None
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Inventors:
MIYAKE NOBUTOSHI
IWATA YUSUKE
SHINOHATA MASAAKI
IWATA YUSUKE
SHINOHATA MASAAKI
Application Number:
JP2018094170A
Publication Date:
November 21, 2019
Filing Date:
May 15, 2018
Export Citation:
Assignee:
ASAHI KASEI CORP
International Classes:
C07C263/04; C07C263/20; C07C265/04; C07C265/14
Domestic Patent References:
| JPS58194849A | 1983-11-12 | |||
| JPS60231640A | 1985-11-18 |
Foreign References:
| US4692550A | 1987-09-08 | |||
| US20110178329A1 | 2011-07-21 |
Attorney, Agent or Firm:
Sumio Tanai
Yasushi Matsunuma
Masato Iida
Field Saki Satoshi
Ryu Miyamoto
Yasushi Matsunuma
Masato Iida
Field Saki Satoshi
Ryu Miyamoto