| 摘要 |
1,1-Dichloro-1-fluoro ethane and/or 1,1-difluoro-1-chloro ethane are prepd. by reacting 1,1,1-trichloro ethane and hydrogen fluoride at 70-12 deg.C and 6-15 atms. pressure in the non-catalyst condition, where the ratio of 1,1-difluoro-1-chloroethane to 1,1,1-trichloro ethane is maintained to be more than 20 mole % in the reaction organic materials, and pref the mole ratio of hydrgen fluoride/1,1,1-trichloro ethane is 3-8. The process provides improved seletivity of HCFC-141b and HCFC-142b and good conversion ratio and reduces forming tarr. The obtd. HCFC-141b and HCFC-142b is useful as a foaming agent, refrigerant, cleaning agent for electric circuit board and dispersing agent for aerosol. The obtd. HCFC-141b and HCFC-142b each can be a substitute for CFC.
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