Manufacture of acrylonitrile

Claim 1

A PROCESS OF PRODUCING ACRYLONITRLE SUBSTANTIALLY FREE OF DIVINVLACETYLENE COMPRISING PASSING ACETYLENE AND HYDROGEN CYANIDE IN AN AMOUNT EXCEEDING THE AMOUNT REQUIRED FOR THE CONVERSION OF SAID ACETYLENE TO ACRYLONITRILE THOUGH A REACTION ZONE CONTAINING AQUEOUS CUPROUS CHLORIDE, REACTING SAID ACETYLENE AND HYDROGEN CYANIDE IN SAID REACTION ZONE TO FORM ACRYLONTIRLE, PASSING THE GAS CONTAINING SAID ACRYLONTRILE, THE EXCESS OF HYDROGEN CYANIDE, AND ACETALDEHYDE FORMED AS BY-PRODUCT IN SAID REACTION ZONE, INTO A ABOSRPTION ZONE, REACTING SAID ACETALDEHYDE AND SAID EXCESS OF HYDROGEN CYANIDE IN ALYST AT A TEMPERATURE BETWEEN -10 AND +20*C. TO FORM LACTONITRILE, FORMING A MIXTURE OF ACRYLONITRILE AND LACTONITRILE IN SAID ABSORPTION ZONE, REMOVING SAID MIXTURE OF ACRYLONITRILE AND LACTONITRILE TOGETHERE FORM SAID ABSORPTION ZONE, RECYCLING THE RESIDUAL GASES INTO THE REACTION ZONE, AND SEPARATING SAID MIXTURE INTO ACRYLONITRILE AND LACTONITRILE.