Improved process for the production of methylmethacrylate monomer from acetoncyanhydrin.

摘要

Process for the purification of raw methylmethacrylate obtained by reacting acetoncyanhydrin with an excess of concentrated sulphuric acid to form methacrylamide sulphate. A transposition reaction at high temperatures is then carried out for obtaining methacrylamide sulphate; then it is carried out the methacrylamide esterification in sulphuric solution diluted with water and by utilizing methanol in excess; washing of the raw methylmethacrylate and subsequent distillation, characterized in that the washing is carried out with diluted ammonia, or amines, and at least an oxidizing agent arid by operating in presence of inhibitors.