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A technology of tetrafluoropropene and trifluoropropene, which is used in the preparation of dehydrohalogenation, organic chemistry, etc., can solve the problems of high potential value of the greenhouse effect, warming, and long residence life, and achieves simple equipment requirements and fewer side reactions. , produce easy-to-control effects
Active Publication Date: 2011-02-23
衢州环新氟材料有限公司
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Although its ozone depletion potential (ODP) is zero, its greenhouse effect potential (GWP) is high and its lifespan in the atmosphere is long. Extensive use will cause global warming
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Embodiment 1
[0022] Embodiment 1, a kind of preparation method of 2,3,3,3-tetrafluoropropene:
[0023] (a) Add CCl to a 5L glass three-neck flask 4 1kg, under ultraviolet light irradiation, with trifluoropropene 500ml / min, CL 2 420ml / min into the three-necked flask CCl 4 layer, the reaction temperature is 50°C, and the product HFC-243db (CF 3 CHClCH 2 Cl) 5kg.
[0024] (b) 3L of industrial liquid caustic soda and 2g of diethylene glycol were added to a 5L glass three-neck flask, the reaction temperature was 60°C, 3kg of HFC-243db was added dropwise in 8 hours, 2.2kg of the product was collected with ice water, and the trifluoroethylene was analyzed by GC Allyl chloride (HCFC-1234xf) content is 92%.
[0025] (c) In a 5L fluorination reaction kettle, add dimethyl sulfoxide 300ml, TiCl 4 20g, 10g of fluorosulfonic acid, 2kg of anhydrous hydrogen fluoride, 1.3kg of chlorotrifluoropropene (HCFC-1234xf), collected in ice water after 18 hours of reaction to obtain 1.43kg of tetrafluorochlor...
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Abstract
The invention relates to a method for preparing 2,3,3,3-tetrafluoropropylene, which comprises the following steps: 1, performing the addition reaction of 3,3,3-trifluoropropylene (CF3CH=CH2) (I) serving as a raw material and chlorine at -10 to 100 DEG C under the irradiation of a ultraviolet lamp in alkyl halide to prepare 3,3,3-trifluoro-1,2-dichloropropane (CF3CHClCH2Cl)(II); 2, performing the dehydrochlorination reaction of the compound of the formula (II) at 0 to 150 DEG C in the presence of an alkali metal hydroxide serving as a catalyst and a high molecular polyether or macromolecular ether serving as a cocatalyst to form CF3CCl=CH2 (III); 3, performing the addition reaction of the compound of the formula (III) and HF to form CF3CClFCH3 (IV) in the presence of a catalyst consisting of SnCl4, TiCl4 and fluosulfonic acid, wherein a polymerization inhibitor is aprotic inert compound, the reaction temperature is 5 to 100 DEG C and the pressure is 0.2 to 1.0MPa; and 4, performing thedehydrochlorination reaction of the compound (IV) at 0 to 100 DEG C and under 0 to 0.5MPa in the presence of an alkali metal catalyst and an organic amine halide serving as a phase transfer catalyst to obtain FO-1234yf.
Description
Technical field: [0001] The invention relates to a preparation method of 2,3,3,3-tetrafluoropropene. Background technique [0002] HFC-134a (CF 3 CH 2 F, 1,1,1,2-tetrafluoroethane) as CFC-12 (dichlorodifluoromethane, CF 2 Cl 2 ) ideal substitutes have been widely used in refrigeration, foaming, aerosol, fire extinguishing and cleaning industries. Although its ozone depletion potential (ODP) is zero, it has a high greenhouse effect potential (GWP) and a long lifespan in the atmosphere, and a large amount of use will cause global warming. Therefore, the European Directive 2006 / 40 on automotive air-conditioning systems (MAC) stipulates that the use of fluorine gases (F-gases) with a GWP higher than 150 will be prohibited after January 1, 2011. The European Union requires all new vehicle platforms to phase out HFC-134a starting from 2011; [0003] In the search for alternatives to HFC-134a, 1,3,3,3-tetrafluoropropene (HFO-1234ze), 2,3,3,3-tetrafluoropropene (HFO-1234yf) an...
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