Patent ID: 9586927
Date: 2017-03-07
CPC Classifications: B01J,C07D

Claim:
1. A method for continuously producing a cyclic carbonate, the method comprising: filling a tributylphosphonium bromide surface-modified silica gel catalyst in a fixed bed tube reactor, contacting a pre-treatment liquid comprising a sacrificial cyclic carbonate with the catalyst to form a glycol, removing the glycol from the fixed-bed tube reactor, and continuously feeding carbon dioxide, 2-bromoethanol and ethylene oxide to the fixed-bed tube reactor to thereby bring the carbon dioxide and the ethylene oxide into contact with the tributylphosphonium bromide surface-modified silica gel catalyst to form a reaction liquid comprising the cyclic carbonate, while continuously withdrawing the reaction liquid from the fixed-bed tube reactor, wherein the sacrificial cyclic carbonate and the cyclic carbonate in the reaction liquid are identical.