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A synthesis method and pentafluoropropane technology are applied in the field of preparation of HFC-245fa, can solve the problems of high reaction energy consumption, low energy efficiency, long preparation route and the like, and achieve the effects of simple process, small equipment investment and low energy consumption
Active Publication Date: 2013-07-24
ZHEJIANG QUHUA FLUOR CHEM
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The disadvantage is that the preparation route is long, the equipment investment is large, and the reaction energy consumption is high
The disadvantage is that this route separates the products of the two-step reaction separately, the steps are complicated, the energy efficiency is low, and the equipment investment is large
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[0031] Put 150ml of compressed chromium-based catalyst containing aluminum and zinc into the first reactor, raise the temperature to 350°C, pass through nitrogen to dry for 6 hours, then cool down to 260°C, pass through anhydrous hydrogen fluoride diluted with nitrogen to activate Treatment, due to the first pass of hydrogen fluoride, the hot spot of the reactor bed is more obvious, and the hot spot of the catalyst bed is controlled by the amount of nitrogen to not exceed 380°C. After 4 hours of activation, the temperature of the first reactor is raised to 350°C, and shut down Nitrogen is used for activation, and the catalyst activation is completed when there is no water vapor overflowing from the outlet of the reactor, and the entire activation process takes about 48 hours.
[0032] The 150ml compressed chromium-based catalyst containing aluminum and zinc is loaded into the second reactor, and activated according to the activation mode of the first reactor.
[0033] Adjust t...
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Abstract
The invention discloses a synthetic method of 1,1,1,3,3-perfluoropropane (HFC-245fa). The method comprises the following step of: preparing the HFC-245fa by carrying out two-step vapor phase catalytic fluorination reaction to 1,1,1,3,3-pentachloropropane (HCC-240) and anhydrous hydrogen fluoride under the action of a chromium-based catalyst, wherein the product containing HCFC-1233zd and HFC-1234ze is acquired through a first-step reaction, then the product acquired through the first-step reaction is directly led to react in a second reactor so as to acquire a product containing HFC-245fa, and then the target product HFC-245fa is acquired after impurities are separated. The synthetic method of the 1,1,1,3,3-perfluoropropane (HFC-245fa) has the advantages of simple process, low energy consumption and low equipment investment.
Description
technical field [0001] The invention relates to the field of preparation of HFC-245fa, in particular to a method for gas-phase two-step synthesis of HFC-245fa. Background technique [0002] 1,1,1,3,3-Pentafluoropropane is a fluorinated hydrocarbon compound that is safe for the atmospheric ozone layer. Its ozone depletion potential (ODP) is zero, the greenhouse effect (GWP) is low, it is non-combustible, and has low toxicity. At present, it is mainly used as a substitute for trifluorochloromethane (CFC-11) and 1,1,1-trichlorofluoroethane (HCFC-141b) blowing agent, and is also widely used in solvents, propellants, fire extinguishing agents and dry etchant. [0003] The preparation method of 1,1,1,3,3-pentafluoropropane mainly uses 1,1,1,3,3-pentachloropropane and anhydrous hydrogen fluoride as raw materials, there are two kinds of liquid phase method and gas phase method, liquid phase method The method generally uses Sb, Sn or Ti chloride as a catalyst, the reaction temperat...
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