PROCESS FOR THE MANUFACTURE OF HALOGENATED PROPANES CONTAINING END-CARBON FLUORINE

• Main Authors: NAPPA, MARIO JOSEPH, WARWAS, EDWIN J, SIEVERT, ALLEN CAPRON
• Format: Patent
• Language: English; French
• Published: 16.10.1997
• Edition: 6
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; METALLURGY; ORGANIC CHEMISTRY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; THEIR RELEVANT APPARATUS; TRANSPORTING

A process is disclosed for producing a compound of the formula: CF3CHXCF3-zYz where X and Y are independently selected from the group consisting of H and Cl, and z is 0 or 1. The process involves (1) contacting CCl3CHXCC3-zYz,CCl2-zYz=CXCC3, and/or CCl2CX=CC3-zYz starting material, with hydrogen fluoride at a temperature of less than 200 ~C to produce a fluorination product of said starting material which includes at least 90 mole percent total of C3HXYzCl6-z-xFx saturated compounds and C3XYzCl5-z-yFy olefinic compounds, wherein x is an integer from 1 to 6-z and y is an integer from 1 to 5-z, (the fluorination product including no more than about 40 mole percent of the desired product, CF3CHXCF3-zYz); (2) contacting saturated compounds and olefinic compounds produced in (1) with hydrogen fluoride in the vapor phase at a temperature of from 200 ~C to about 400 ~C in the presence of a fluorination catalyst; and (3) reacting a sufficient amount of said compounds, wherein x is an integer from 1 to 5-z and olefinic compounds produced in (1) with hydrogen fluoride in the vapor phase at a temperature of from 200 ~C to about 400 ~C in the presence of a vapor phase fluorination catalyst to provide an overall selectivity to CF3CHXCF3-zYz of at least about 90 percent based upon the amount of starting material reacted with HF in (1) and (2).