PROCESS FOR THE RECOVERY OF EPSILON-CAPROLACTAM FROM A REACTION MIXTURE OF EPSILON-CAPROLACTAM AND SULPHURIC ACID

摘要

1506139 Purifying caprolactam STAMICARBON BV 18 Jan 1977 [3 Feb 1976] 01935/77 Heading C2C #-Caprolactam is recovered from mixtures thereof with sulphuric acid by at least partially neutralizing the mixture with a gas comprising SO 2 and NH 3 to form an ammonium salt and SO 2 , discharging the latter, separating the lactam from an aqueous solution or melt containing the salt and decomposing the salt to form a gaseous mixture containing SO 2 and NH 3 which may, if desired, be recycled.