Patent ID: 6066769
Filing Date: 2000-05-23
Classification: B01J,C07C

Abstract:
A process for producing a compound of the formula CF.sub.3 CHXCF.sub.3-z Y.sub.z, wherein X and Y are independently selected from the group consisting of H and Cl and z is 0 or 1, comprising:(1) contacting starting material selected from the group consisting of a compound of the formula CCl.sub.3 CHXCCl.sub.3-z Y.sub.z, and mixtures thereof, with hydrogen fluoride at a temperature of less than 200.degree. C. to produce a fluorination produce of said starting material which includes at least 90 mole percent of compounds selected from the group consisting of saturated compounds having the formula C.sub.3 HXY.sub.z Cl.sub.6-z-x F.sub.x and olefinic compounds of the formula C.sub.3 XY.sub.z Cl.sub.5-z-y F.sub.y, wherein x is an integer from 1 to 6-z and y is an integer from 1 to 5-z, said fluorination product including no more than about 40 mole percent CF.sub.3 CHXCF.sub.3-z Y.sub.z ;(2) contacting compounds selected from the group consisting of said saturated compounds and said olefinic compounds produced in (1) with hydrogen fluoride in the vapor phase at a temperature of from 200.degree. C. to about 400.degree. C. in the presence of a fluorination catalyst; and(3) reacting a sufficient amount of said saturated compounds, wherein x is an integer from 1 to 5-z and said olefinic compounds produced in (1) with hydrogen fluoride in the vapor phase at a temperature of from 200.degree. C. to about 400.degree. C. in the presence of a vapor phase fluorination catalyst to provide an overall selectivity to CF.sub.3 CHXCF.sub.3-z Y.sub.z of at least about 90 percent based upon the amount of starting material reacted with HF in (1) and (2).