A PROCESS FOR THE PREPARATION OF METHACRYLAMIDE (MAA) FROM ACETONCYANOHYDRIN

摘要

A process for the preparation of methacrylamide (MAA) wherein 0.3 to 1 mole of H2SO4 are used for mole of MAA produced, comprising step I) which includes stage (a) of reaction of the acetoncyanohydrin (ACH) with a mixture of sulphuric acid and of an alkyl- or aryl-sulphonic acid, at temperatures of 50 DEG -100 DEG C, with sulphuric acid/ACH molar ratios in the range 1:1-2:1, and stage (b) of heating of the reaction mixture of stage (a) at temperatures of 120 DEG -160 DEG C, and step II) including stage (a1) of reaction of fresh ACH and the mixture coming from stage (b) under the same conditions of stage (a), and stage (b1) of heating of the reaction mixture obtained in stage (a1) under the same conditions of stage (b).