Carbonate ester purification method, carbonate ester solution production method, and carbonate ester purification apparatus

Patent metadata

Field	Value
Publication number	US-10351508-B2
Application number	US-201515538634-A
Country	US
Kind code	B2
Filing date	Dec 25, 2015
Priority date	Dec 26, 2014
Publication date	Jul 16, 2019
Grant date	Jul 16, 2019

Abstract

Provided is a carbonate ester purification apparatus including a treatment part for mixing a first solution containing a carbonate ester and an acidic substance with an alcohol solution of a metal alcoholate to obtain a mixed solution containing a reaction product of the acidic substance and the metal alcoholate, a separation part for removing a metal salt contained in the reaction product from the mixed solution to obtain a second solution, and a distillation part for removing a component from the second solution, the component different in boiling point from the carbonate ester to obtain a carbonate ester solution, wherein a content of the metal alcoholate in the alcohol solution is 5 to 18 mass %.

First claim

The invention claimed is:

1. A carbonate ester solution production method comprising:
an alkali treatment step of mixing a first solution containing a carbonate ester and an acidic substance with an alcohol solution of a metal alcoholate to obtain a mixed solution containing a reaction product of the acidic substance and the metal alcoholate;
a removal step of removing a metal salt contained in the reaction product from the mixed solution using a filtering device provided with a filter to obtain a second solution containing the carbonate ester; and
a distillation step of removing a component from the second solution, the component having a different boiling point from the carbonate ester to obtain a carbonate ester solution,
wherein a content of the metal alcoholate in the alcohol solution is 5 to 18 mass %,
and wherein the first solution is obtained by condensing a product obtained by gas phase reaction of carbon monoxide and nitrite in the presence of a platinum group metal solid catalyst.

2. The carbonate ester solution production method according to claim 1 , wherein a content of a methoxymethyl methyl carbonate in the carbonate ester solution is less than 2 mass ppm.

3. The carbonate ester solution production method according to claim 1 , wherein a purity of the carbonate ester in the carbonate ester solution is 99.99 mass % or more.

4. The carbonate ester solution production method according to claim 1 , wherein the acidic substance contains at least one selected from the group consisting of nitric acid, a nitrous acid, a nitric acid compound and nitrous acid compound.

Assignees

• Ube Industries

Inventors

• Il Hirofumi
• FUKUI Yuya
• SHIMASAKI Yohei
• Okano Koji
• Takebayashi Koji
• Nakao Naoto

Classifications

• C07C69/96

  Esters of carbonic or haloformic acids · CPC title

• C07C68/08 Primary

  Purification; Separation; Stabilisation · CPC title