申请人:E. I. du Pont de Nemours and Company
公开号:US06066769A1
公开(公告)日:2000-05-23
A process is disclosed for producing a compound of the formula: CF.sub.3 CHXCF.sub.3-z Y.sub.2 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 CCl.sub.3 CHXCC.sub.3-z Y.sub.z,CCl.sub.2-z .dbd.CXCC.sub.3, and/or CCl.sub.2 CX.dbd.CC.sub.3-z Y.sub.z starting material, with hydrogen fluoride at a temperature of less than 200.degree. C. to produce a fluorination product of said starting material which includes at least 90 mole percent total of C.sub.3 HXY.sub.z Cl.sub.6-z-x F.sub.x saturated compounds and C.sub.3 XY.sub.z Cl.sub.5-z-y F.sub.y 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, CF.sub.3 CHXCF.sub.3-z Y.sub.z); (2) contacting saturated compounds and 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 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.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).
本发明公开了一种生产化合物的方法,该化合物的化学式为:CF.sub.3 CHXCF.sub.3-z Y.sub.2,其中X和Y是独立选择自H和Cl的一组,z为0或1。该方法包括:(1)将CCl.sub.3 CHXCC.sub.3-z Y.sub.z、CCl.sub.2-z .dbd.CXCC.sub.3和/或CCl.sub.2 CX.dbd.CC.sub.3-z Y.sub.z起始物料与氢氟酸接触,温度低于200°C,以产生起始物料的氟化产物,其中至少包括90摩尔%的C.sub.3 HXY.sub.z Cl.sub.6-z-x F.sub.x饱和化合物和C.sub.3 XY.sub.z Cl.sub.5-z-y F.sub.y烯烃化合物,其中x为1至6-z的整数,y为1至5-z的整数,(所述氟化产物中所含期望产物CF.sub.3 CHXCF.sub.3-z Y.sub.z的摩尔百分含量不超过40%);(2)在存在氟化催化剂的条件下,将(1)中产生的饱和化合物和烯烃化合物与氢氟酸在200°C至约400°C的蒸汽相中接触;以及(3)在存在蒸汽相氟化催化剂的条件下,将(1)中产生的x为1至5-z的整数和烯烃化合物与氢氟酸在200°C至约400°C的蒸汽相中接触,以提供对于起始物料在(1)和(2)中与HF反应的总选择性至少为90%的CF.sub.3 CHXCF.sub.3-z Y.sub.z。