| 摘要 |
PCT No. PCT/US97/06013 Sec. 371 Date Oct. 6, 1998 Sec. 102(e) Date Oct. 6, 1998 PCT Filed Apr. 4, 1997 PCT Pub. No. WO97/37956 PCT Pub. Date Oct. 16, 1997A process is disclosed for producing a compound of the formula: CF3CHXCF3-zY2 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-z=CXCC3, and/or CCl2CX=CC3-zYz starting material, with hydrogen fluoride at a temperature of less than 200 DEG 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 DEG C. to about 400 DEG 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 DEG C. to about 400 DEG 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).
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