Recovery method and production method for cyclic carbonate

Patent metadata

Field	Value
Publication number	US-2024367104-A1
Application number	US-202218569121-A
Country	US
Kind code	A1
Filing date	Jul 5, 2022
Priority date	Jul 26, 2021
Publication date	Nov 7, 2024
Grant date	—

Abstract

Provided is a method for effectively using a polyalkylene carbonate as an organic binder in the production of ceramic components. Specifically, provided is a method for recovering or producing a cyclic carbonate, comprising recovering a cyclic carbonate contained in a decomposition gas generated by thermal decomposition of a polyalkylene carbonate.

First claim

1 . A method for recovering a cyclic carbonate, comprising:
(B) recovering a cyclic carbonate contained in a decomposition gas generated by thermal decomposition of a polyalkylene carbonate.

2 . The method according to claim 1 , further comprising, before (B):
(A) thermally decomposing and gasifying a polyalkylene carbonate.

3 . The method according to claim 1 , wherein the recovery of the decomposition gas is performed after concentrating the decomposition gas.

4 . The method according to claim 2 , comprising:
(a) heating a mixture containing a polyalkylene carbonate and an inorganic material to decompose and gasify the polyalkylene carbonate; and (b) concentrating and recovering the obtained gas.

5 . The method according to claim 3 , wherein the gas concentration is performed by at least one operation selected from the group consisting of the following (i), (ii), and (iii):
(i) causing a polyalkylene carbonate decomposition gas to be adsorbed to a gas adsorbent; (ii) separating a polyalkylene carbonate decomposition gas with a gas separation material; and (iii) cooling and liquefying a polyalkylene carbonate decomposition gas.

6 . The method according to claim 1 , wherein the cyclic carbonate is at least one member selected from the group consisting of ethylene carbonate, propylene carbonate, butylene carbonate, and cyclohexene carbonate.

7 . A method for producing a cyclic carbonate, comprising:
(B) recovering a cyclic carbonate contained in a decomposition gas generated by thermal decomposition of a polyalkylene carbonate.

8 . The method according to claim 7 , further comprising, before (B):
(A) thermally decomposing and gasifying a polyalkylene carbonate.

9 . The method according to claim 7 , wherein the recovery of the decomposition gas is performed after concentrating the decomposition gas.

10 . The method according to claim 8 , comprising:
(a) heating a mixture containing a polyalkylene carbonate and an inorganic material to decompose and gasify the polyalkylene carbonate, and (b) concentrating and recovering the obtained gas.

11 . The method according to claim 9 , wherein the gas concentration is performed by at least one operation selected from the group consisting of the following (i), (ii), and (iii):
(i) causing a polyalkylene carbonate decomposition gas to be adsorbed to a gas adsorbent; (ii) separating a polyalkylene carbonate decomposition gas with a gas separation material; and (iii) cooling and liquefying a polyalkylene carbonate decomposition gas.

12 . The method according to claim 7 , wherein the cyclic carbonate is at least one member selected from the group consisting of ethylene carbonate, propylene carbonate, butylene carbonate, and cyclohexene carbonate.

Assignees

• Sumitomo Seika Chemicals

Inventors

• HAYAMIZU Naohisa

Classifications

• C07D317/36

  Alkylene carbonates; Substituted alkylene carbonates · CPC title

• B01D2257/50

  Carbon oxides · CPC title

• B01D53/02 Primary

  by adsorption, e.g. preparative gas chromatography {(solid sorbent compositions B01J20/00, preparation of inorganic compounds or elements C01)} · CPC title

• B01D53/44

  Organic components · CPC title

• B01D53/81

  Solid phase processes · CPC title