Methacrylic Acid → Carbon Dioxide

Participants

Reaction Steps

U.S. Pat. No. 3,839,437, describes a process of preparing methacrylic acid by employing calcium hydroxide to form the metal salt of the acid, calcium methacrylate, and neutralization with CO2 at low pressure to give the acid and the insoluble calcium carbonate in the presence of a water immiscible organic solvent, such as an ether, to extract the methacrylic acid from the aqueous phase. Continuous passage of carbon dioxide with ether extraction gave only 10.6 and 41.3 percent methacrylic acid recovery in 1 and 4 hours respectively.

Provenance & Evidence