Process for the preparation of trifluorinated and tetrafluorinated compounds
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A technology of hydrogen fluoride and trifluoropropane, applied in the field of preparation of trifluoride and tetrafluoride, can solve the problems of no separation, no generation of 243db, no preparation, etc.
Inactive Publication Date: 2011-08-03
ARKEMA FRANCE SA
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However, the only examples of TFP are carried out in the presence of bromine and iodine in the presence of hydrogen fluoride; neither 2,3-dibromo compounds nor 2,3-dibromocompounds were isolated nor prepared in this document. iodine compound
[0010] Therefore, throughout the technical literature there is no description of TFP producing 243db via this efficient chlorination reaction
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Embodiment 1
[0071]The apparatus used consisted of a double-jacketed autoclave with a capacity of 1 liter, made of 316L stainless steel, including stirring means. The stirring device was equipped with pressure and temperature gauges. The inlet at the top of the autoclave is for reagent entry and venting. After the addition of the solid catalyst, a seal test was performed by introducing 46 g of iron metal test samples previously washed in a 1.098 mol (78 g) chlorine solution of hydrochloric acid into a reactor previously placed in vacuum and cooled in liquid nitrogen. Then 1.098 mol (105.5 g) of trifluoropropene were added. The autogenous pressure is approximately 6 bras. The reactor was pressurized to 10 brass absolute using helium. The reaction medium is allowed to stir for 4 hours. The reactor was then depressurized slowly. In this way, 163.4 g of a yellowish cloudy liquid were recovered at the bottom of the reactor. The nature of this liquid is equipped with a Carbopack Gas chro...
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Abstract
The subject of the invention is a process for the preparation of 2,3-dichloro-1,1,1-trifluoropropane by chlorination of 3,3,3-trifluoropropene at a pressure greater than 2 bar. Application in the synthesis of 1234yf.
Description
technical field [0001] The present invention relates to the preparation method of fluoride 2,3-dichloro-1,1,1-trifluoropropane compound (243db), which can be obtained by 2,3-dichloro-1,1,1-trifluoropropane compound Preparation of 2,3,3,3-tetrafluoro-1-propene (HFO1234yf). Background technique [0002] Hydrofluorocarbons (HFCs), especially hydrofluoroolefins, such as 2,3,3,3-tetrafluoro-1-propene (HFO 1234yf), can be used as refrigerants and heat exchange fluids, fire extinguishing agents, and propellants due to their properties , blowing agents, swelling agents, gaseous dielectrics, polymeric or monomeric media, support fluids, abrasives, desiccants, and fluids for power production units are well known. Unlike CFCs and HCFCs which are potentially harmful to the ozone layer, HFOs do not contain chlorine and thus have no impact on the ozone layer. [0003] Several methods for preparing 1234yf are known. [0004] WO2007 / 079431 describes the preparation of 1234yf by a process...
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