HCFC-123 is a replacement for CFC-11 and CFC-113, and its primary use is to replace CFC-11 as a refrigerant for low pressure centrifugal chillers and has been recognized globally. HCFC-123 is also used as part of a mixed fire extinguishing agent in place of halons 1211 and 1302. In addition, HCFC-123 can also be used as a cleaning agent and a blowing agent.
HCFC-124 is used as an alternative to CFC-114 and is used as a refrigerant for chillers and is used as a main component of centrifugal refrigerators and now as a substitute for refrigerant-to-liquids R-401 and R-409, For medium temperature refrigerant.
HFC-125 is mainly used for the preparation of mixed refrigerant R-404A, R-407C, R-401A and R-507A, instead of R-502 and HCFC-22 for low temperature and medium temperature refrigeration. HFC-125 can also replace the halon 1301. The 2003 world is HFC-125 installed capacity of 23,000 tons / year. With the elimination of the R-502 and HCFC-22, the HFC-125 market demand will increase rapidly and its production capacity will grow rapidly.
HCFC-123, HCFC-124 and HFC-125 production routes are two: (1) with trichlorethylene as raw material, first by HF gas phase and catalytic fluorination to obtain HCFC-133a, and then chlorinated HCFC-123 HCFC-123, HCFC-124 and HFC-125 were prepared by fluorination of HCFC-123 and HCFC-124, HFC-125, and HCFC-123. From the technical and economic analysis, the tetrafluoroethylene gas phase fluorination reaction route is appropriate, the HFC-125 production is greater than the HCFC-124 production.
Tetrachloroethylene can also produce HFC-134a, divided into two steps: the first step to tetrachlorethylene, HF, CI2 as raw materials, in the presence of ALF3 catalyst conditions, the gas phase chlorofluorination reaction, obtained CFC-114a, CFC -114 and a small amount of CFC-115, followed by hydrogenolysis under the conditions of 100 to 350 ° C and Pd-C catalyst to obtain HFC-134a and other by-products.
