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Process for the production of acrylonitrile from acetylene and hydrogen cyanide

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1. THE PROCESS FOR PREPARING ACRYTLONITRILE WHICH COMPRISES FEEDING HYDROGEN CYANIDE AND AT LEAST 5 MOLES OF ACETYLENE PER 1 MOLE OF HYDROGEN CYANIDE INTO A SUBSTANTIALLY ANHYDROUS CUPROUS CHLORIDE LIQUID CATALYST, THE CUPROUS CHLORIDE BEING DISSOLVED IN AN ORGANIC NITRILE SOLVENT HAVING A BOILING POINT AT ATMOSPHERIC PRESSURE ABOVE 100* C., MAINTAINING THE LIQUID CATALYST AT A TEMPERATURE ABOVE 70* C, AND BELOW THE BOILING POINT OF THE ORGANIC NITRILE SOLVENT, CONDUCTING AWAY FROM THE LIQUID CATALYST AN OFF-GAS CONTAINING ACRYLONITRILE, VOLATILE BY-PRODUCTS UNREACTED ACETYLENE AND ANY PART OF THE BY-PRODUCTS, VAPORIZED FROM THE LIQUID CATALYST, SEPARATING AT LEAST 30% OF THE ACRYLONITRILE AND PART OF THE BY-PRODUCTS FROM THE OFF-GAS AS A CRUDE ACRYLONITRILE PRODUCT, AND RECYCLING THE UNREACTED ACETYLENE, PART OF THE VOLATILE BY-PRODUCTS AND AT LEAST 10% OF THE ACRYLONITRILE INITIALLY CONTAINED IN THE OFF-GAS TO THE LIQUID CATALYST.
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