Process for preparing vinyl fluoride and 1, 1-difluoroethane

Claim 1

A PROCESS FOR PREPARING VINYL FLUORIDE AND 1,1-DIFLUOROETHANE WHICH PROCESS COMPRISES (A) PASSING ANHYDROUS HYDROGEN FLUORIDE AT FROM ABOUT 200*C. TO ABOUT 500*C. OVER A CATALYST CONSISTING ESSENTIALLY OF AN ACTIVATED ALUMINUM OXIDE OR ALUMINUM OXIDE HYDRATE UNTIL FROM ABOUT 0.3 MOLE TO ABOUT 6 MOLES OF HYDROGEN FLUORIDE PER MOLE OF ALUMINUM OXIDE HAVE REACTED WITH THE ALUMINUM OXIDE, THEN (B) PASSING A MIXTURE OF ANHYDROUS HYDROGEN FLUORIDE AND ACETYLENE AT A TEMPERATURE OF FROM ABOUT 250* C. TO ABOUT 400*C. AND AT A PRESSURE FROM 0.1 TO 4 ATMOSPHERES OVER SAID PRETREATED ALUMINUM OXIDE CATALYST, SAID MIXTURE OF HYDROGEN FLUORIDE AND ACETYLENE HAVING A MOLAR RATIO OF FROM ABOUT 1 TO ABOUT 5 MOLES OF HYDROGEN FLUORIDE PER MOLE OF ACETYLENE, THE FEED RATE OF ACETYLENE IN SAID MIXTURE BEING FROM ABOUT 10 TO ABOUT 4,000 MLLILITERS, MEASURED AT STANDARD CONDITIONS, PER GRAM OF CATALYST PER HOUR, AND (C) RECOVERING FROM SAID REACTION MIXTURE VINYL FLURIDE AND 1, 1-DIFLUOROETHANE.