Application of ionic liquid in propylene glycol ether synthesis and method for synthesizing propylene glycol ether

Patent metadata

Field	Value
Publication number	US-10604468-B2
Application number	US-201615748312-A
Country	US
Kind code	B2
Filing date	Nov 14, 2016
Priority date	May 20, 2016
Publication date	Mar 31, 2020
Grant date	Mar 31, 2020

Abstract

The present invention relates to the technical field of chemical engineering and catalysis. Provided are an application of an ionic liquid in propylene glycol ether synthesis and a method for synthesizing a propylene glycol ether. The ionic liquid is a methyl carbonate ionic liquid, and is used as a catalyst for catalyzing propylene glycol ether synthesis. The method for synthesizing the propylene glycol ether comprises the following steps: placing propylene oxide and an alcohol within a reactor to contact a catalyst, and heating the mixture in an enclosed environment to 50-200° C. to obtain the propylene glycol ether, wherein the catalyst is a methyl carbonate ionic liquid. The method for synthesizing propylene glycol ether provided in the present invention is a green synthesis technique, and does not require special production equipment. The method has simple and easily controllable processes, and can be used in industrial production and applications.

First claim

The invention claimed is:

1. A method for synthesizing propylene glycol ether comprising the following steps:
propylene oxide and an alcohol are fed into a reactor to contact with a catalyst and heated to 50° C. to 200° C. in a closed environment to obtain the propylene glycol ether, wherein the catalyst is methyl carbonate ionic liquid, wherein the methyl carbonate ionic liquid is at least one selected from a group consisting of [N 2221 ][MC], [N 4441 ][MC], [N 4444 ][MC], [EMIM][MC], [DMIM][MC] and [BMIM][MC], and the ionic liquid has the following structural formulas:

wherein the molar ratio of methyl carbonate ionic liquid to propylene oxide is from 1:50 to 1:200.

2. The method for synthesizing propylene glycol ether according to claim 1 , wherein the molar ratio of propylene oxide to alcohol is from 1:1 to 1:10.

3. The method for synthesizing propylene glycol ether according to claim 2 , wherein the molar ratio of propylene oxide to alcohol is from 1:2 to 1:4.

4. The method for synthesizing propylene glycol ether according to claim 2 , wherein the heating time is from 10 to 300 minutes.

5. The method for synthesizing propylene glycol ether according to claim 2 , wherein the alcohol is any one of C1-C8 alcohols.

6. The method for synthesizing propylene glycol ether according to claim 2 , wherein the heating is microwave heating.

Assignees

• Inst Process Eng Cas

Inventors

• Liu Ruixia
• Zhang Suojiang
• Zhang Ruirui
• Zhang Junping
• Chen Shengxin
• Dai Fei

Classifications

• B01J31/0288

  Phosphorus · CPC title

• B01J31/0279

  the cationic portion being acyclic or nitrogen being a substituent on a ring · CPC title

• B01J31/0284

  of an aromatic ring, e.g. pyridinium · CPC title

• C07C41/03 Primary

  by reaction of oxirane rings with hydroxy groups · CPC title

• B01J2231/48

  Ring-opening reactions · CPC title