Synthesis catalyst and synthesis method for unsaturated carboxylic acid and/or derivative thereof

摘要

Using conventional synthesis methods, when an unsaturated carboxylic acid or a derivative thereof is synthesized from a hydroxycarboxylic acid or a derivative thereof by a dehydration reaction using a catalyst, the yield has been low. Accordingly, an object of the present invention is to provide a catalyst capable of synthesizing unsaturated carboxylic acids or derivatives thereof by a dehydration reaction that produces a high yield. The synthetic catalyst comprises an apatite compound containing an alkali metal in a crystal structure thereof, and the invention further includes methods for synthesizing an unsaturated carboxylic acid and/or a derivative thereof. The methods comprise contacting the aforementioned synthetic catalyst with the hydroxycarboxylic acid and/or a derivative thereof, so as to synthesize the unsaturated carboxylic acid and/or a derivative thereof by a dehydration reaction.

主权项

1. A synthetic catalyst for synthesizing an unsaturated carboxylic acid and/or a derivative thereof from a hydroxycarboxylic acid and/or a derivative thereof by a dehydration reaction, wherein the synthetic catalyst comprises an apatite compound containing an alkali metal in the crystal structure thereof, wherein the alkali metal is sodium and/or potassium, wherein the content percentage of the alkali metal in the apatite compound is 0.2 to 3.0% by mass, wherein the hydroxycarboxylic acid is lactic acid, citric acid, 3-hydroxypropionic acid, 3-hydroxy-2-methylpropionic acid, 3-hydroxybutanoic acid, 3-hydroxy-2-methylbutanoic acid or 2,3-dimethyl-3-hydroxybutanoic acid, wherein the derivative is a salt or ester, and wherein the unsaturated carboxylic acid and/or a derivative thereof is an unsaturated carboxylic acid and/or a salt or ester thereof.