Patent ID: 9682915
Date: 2017-06-20
CPC Classifications: C07C,Y02P

Claim:
1. A method for producing a methacrylic acid ester, which comprises the following steps: a dehydration reaction step: a step of having acetone undergo a dehydration reaction in the presence of a dehydration reaction catalyst to obtain a reaction mixture containing propyne, propadiene, and water; a propyne/propadiene separation step: a step of separating a mixture containing propyne and propadiene as main components from the reaction mixture obtained in the dehydration reaction step; a propyne purification step: a step of separating the mixture containing propyne and propadiene as main components separated in the propyne/propadiene separation step into a liquid, gas, or gas-liquid mixture containing propyne as a main component, and a liquid, gas, or gas-liquid mixture containing propadiene as a main component; and a carbonylation reaction step: a step of bringing the liquid, gas, or gas-liquid mixture containing propyne as a main component obtained in the propyne purification step into contact with carbon monoxide and an alcohol having 1 to 3 carbon atoms in the presence of a catalyst containing at least one selected from the group consisting of Group 8 metal elements, Group 9 metal elements, and Group 10 metal elements to obtain a methacrylic acid ester; and wherein the dehydration reaction catalyst is a catalyst containing silicon and at least one selected from the group consisting of Group 1 metal elements and Group 2 metal elements.