Method for producing catalyst for cyclic carbonate synthesis

Patent metadata

Field	Value
Publication number	US-9834536-B2
Application number	US-201414786334-A
Country	US
Kind code	B2
Filing date	Apr 22, 2014
Priority date	Apr 23, 2013
Publication date	Dec 5, 2017
Grant date	Dec 5, 2017

Abstract

A method for producing a heterogeneous catalyst for use of synthesizing cyclic carbonates by reacting an epoxide and carbon dioxide in the presence of the catalyst. A method for making a catalyst that includes forming a catalyst precursor then reacting the catalyst precursor with a tertiary phosphine.

First claim

The invention claimed is:

1. A method for producing a catalyst, comprising:
obtaining a catalyst precursor having a haloalkyl group or a haloaryl group, by reacting a silane compound having a haloalkyl group or a haloaryl group with a silica gel having an average pore diameter of 3.5 nm to 50 nm, and
obtaining the catalyst, by reacting the catalyst precursor with a tertiary phosphine, at a temperature of 100-160° C. for 10-50 hours in xylene, wherein the catalyst formed by the reacting has a [halogen]/[phosphorus] molar ratio of 0.8 to 1.5,
wherein the catalyst has a phosphorus content of 0.25 mmol to 0.6 mmol per 1 g of the catalyst,
wherein the silane compound has formula (1):
X—R 1 —Si(OR 2 ) 3   (1)

wherein R 1 represents a linear or branched alkylene group having 2 to 8 carbon atoms, an arylene group, an alkarylene group, an arylenealkylene group or an alkylenearylene group; R 2 represents an alkyl group having 1 to 4 carbon atoms; and X represents a halogen atom, and
wherein the tertiary phosphine has formula (2):

wherein R 3 to R 5 each independently represents an alkyl group having 1 to 8 carbon atoms, an aryl group, an aralkyl group, an alkoxyalkyl group or an alkoxy substituted aryl group.

2. The method according to claim 1 , wherein the silica gel has an average pore diameter of 3.5 nm to 25 nm.

3. The method according to claim 1 , wherein the [halogen]/[phosphorus] molar ratio is 1.0 to 1.5.

4. The method according to claim 1 , wherein the catalyst obtained has a specific surface area of 100 m 2 /g to 1,000 m 2 /g.

5. The method according to claim 1 , wherein the silica gel has an average pore diameter of 10 nm to 25 nm.

6. The method according to claim 1 , wherein the catalyst has a surface area of from 80 to 273 m 2 /g.

7. The method according to claim 1 , wherein the catalyst obtained has a phosphorus content of 0.3 to 0.56 mmol per 1 g of the catalyst.

8. The method according to claim 1 , further comprising:
forming the silica gel, before obtaining the catalyst precursor, by treating the silica gel with hydrochloric acid then washing with water.

9. The method according to claim 1 , wherein the [halogen]/[phosphorus] molar ratio is 0.8 to 1.4.

10. The method according to claim 1 , wherein the [halogen]/[phosphorus] molar ratio is 0.8 to 1.3.

Assignees

• Aist
• Maruzen Petrochem Co Ltd

Inventors

• Takahashi Toshikazu
• Yasuda Hiroyuki
• Sakakura Toshiyasu
• Yamamoto Shouji
• Naniki Takashi
• Furukawa Takuro

Classifications

• B01J35/1023

  Operations & Transport · mapped topic

• B01J31/0269

  on mineral substrates · CPC title

• B01J35/1061

  Operations & Transport · mapped topic

• B01J31/0231

  Halogen-containing compounds · CPC title

• B01J31/0268

  Phosphonium compounds, i.e. phosphine with an additional hydrogen or carbon atom bonded to phosphorous so as to result in a formal positive charge on phosphorous · CPC title