公开(公告)号：US3562320A

公开(公告)日：1971-02-09

申请号：US3562320D

申请日：1967-04-25

Applicant: ESCAMBIA CHEM CORP

Inventor： WOODWARD GEORGE E ,  HEIN RICHARD W

IPC: C07C51/377 ,  C07C57/04

CPC classification number: C07C51/377 ,  C07C57/04

Abstract: METHACRYLIC ACID IS PRODUCED BY DEHYDRATING ALPHA-HYDROXYISOBUTYRIC ACID IN THE LIQUID PHASE UNDER THE INFLUENCE OF HEAT AND A CATALYST WHICH IS A METAL SALT OF ALPHA-HYDROXYISOBUTYRIC ACID. THE PROCESS IS DESIRABLY CARRIED OUT AT A TEMPERATURE IN EXCESS OF ABOUT 180*C., WHILE MAINTAINING THE ALPHA-HYDROXYISOBUTYRIC ACID IN THE LIQUID STATE. THE METAL SALT OF ALPHA-HYDROXYISOBUTYRIC ACID IS OBTAINED BY REACTING THE ACID WITH A METAL HYDROXIDE OR METAL SALT WHICH WILL REACT WITH THE ALPHA-HYDROXYISOBUTYRIC ACID TO PRODUCE THE CORRESPONDING METAL SALT OF THE ACID. DESIRABLY, THE PORCESS IS CARRIED OUT IN THE PRESENCE OF A POLYMERIZATION INHIBITOR FOR THE METHACRYLIC ACID WHICH IS FORMED DURING THE PROCESS.