The method of producing pentafluoroethane

 

(57) Abstract:

The invention relates to organic chemistry, in particular to a method of obtaining Pentafluoroethane, which is used in the reactions telomerization and as raw material for the preparation of many organic compounds. The proposed method is the interaction of tetrafluoroethylene with a mixture of iodine, iodine PENTAFLUORIDE at a temperature of 40 - 80oWith the presence of metallic antimony as a catalyst and in the presence of additives mixture of deformity with triptorelin in number 710-4-2,610-2wt.%. The result is increased productivity of the process, exclude the use of inert diluent, reduced the price process becomes less dangerous, it is possible to obtain a finished product with a high content of basic substance, thereby eliminating stage further purification.

This invention relates to the field of organic chemistry, in particular the production of godforsaken used in the reactions telomerization for the production of low molecular weight polymers and as raw material for the preparation of many organic compounds (including fluorinated surfactants).

Describes a method for pentatomidae the catalyst - PENTAFLUORIDE antimony or a mixture of antimony TRIFLUORIDE and iodine [U.S. Pat. USA N 3283020 from 01.01.1996].

Significant disadvantages of this method are the need to prior 1,2-deuteration, which leads to complication of the process; mandatory compliance with a specific ratio of reacting components, otherwise the reaction will proceed with the formation of longer carbon chain.

Previously published method of producing Pentafluoroethane reaction of tetrafluoroethylene with monitoriza iodine in the presence of aluminum metal as a catalyst and in the presence of inhibitor (1,1,2-trichloro-2,2-diphtheriatetanus) [U.S. Pat. USA N 3006973 on October 31, 1961].

The disadvantages of the method are low output Pentafluoroethane (59% in terms of amount of tetrafluoroethylene), the mandatory use of the inhibitor in the absence of which the main reaction products were terraformer and carbon.

The closest in technical essence and essential features is the method of receiving odporucane reaction mixture farolatino with the inert gas with a solution of iodine and trioxide of antimony PENTAFLUORIDE in iodine at a temperature of 40 - 80Oska performance; the use of inert gas as a transporting agent in the synthesis of Pentafluoroethane that it is not possible to obtain the target product of high purity due to the presence of non-condensable impurities (inert gases). The raw contains no higher than 94% of Pentafluoroethane, as impurities contains tetrafluoroethylene 5.2%, freon-0.6%, pentaverate of 0.2%. Raw should be subjected to rectification, therefore, the process is complicated by the stage of purification.

Use as inert nitrogen gas requires additional purification from oxygen to ensure the safe conduct of the process. Additional purification of nitrogen from oxygen, and an inert gas is expensive helium increase the cost of the process.

As the catalyst used toxic antimony trioxide. The presence of acidic components (iodine, iodine PENTAFLUORIDE) capable of causing polymerization of tetrafluoroethylene, which can lead to uncontrolled reactions, ending with a Bang.

The task of the invention is to develop a method of producing Pentafluoroethane without the above disadvantages.

The problem is solved by the method of Metallichesky antimony as a catalyst and in the presence of additives mixture of deformity with triptorelin of 7 to 10-4- 2,6 10-2wt.% as inhibitors of spontaneous polymerization of tetrafluoroethylene. With the introduction of the mixture of deformity with triptorelin fewer than 7 of 10-4wt. % is observed the formation of polytetrafluoroethylene, which complicates the process, makes it more dangerous and reduces the efficiency of the process. The use of these additives in excess of 2.6 10-2wt.%, leads to deterioration of the composition of the raw, the decrease in the content of the basic substance in the resulting product.

The process is conducted at a temperature of 40 - 80oC.

The advantages of the proposed method are improving the performance of the process; the process without the use of an inert diluent, which reduces the process and make it less dangerous.

As the catalyst, the proposed method uses a metal antimony is less toxic than antimony trioxide. The presence of additives: deformity and triptorelin stabilizes the process, except for the spontaneous polymerization of tetrafluoroethylene.

The invention is illustrated by the following examples.

Example 1.

In the reactor of stainless steel with a capacity of 1 l, snobunny the 30 g of metallic antimony. The molar ratio of the initial reagents 1:1,25:0,24. Heated reactor to 60oC and gave tetrafluoroethylene with addition of 1.6 10-2wt.% a mixture of deformity with triptorelin. The total amount of tetrafluoroethylene 1260 After condensation synthesis gas obtained 3096 g of product containing 99.9% of Pentafluoroethane, 0.1% tetrafluoroethylene. The performance of the process 200 g/LCH.

Example 2.

Under the conditions described in example 1, the process is conducted in the presence of 5 to 10-4wt.% a mixture of deformity with triptorelin. After 2 hours of process in the reaction mass discovered polymer in an amount of 10% of spent of tetrafluoroethylene. The process is terminated.

Example 3.

Under the conditions described in example 1, the process is conducted in the presence of 3 to 10-2wt.% a mixture of deformity with triptorelin. Consumption of triptorelin 18,8 l/H. the synthesis Time is 15 hours. The obtained product with a basic substance content of 93.5%. The performance of the process 170 g/LCH.

The method of producing Pentafluoroethane interaction of tetrafluoroethylene with a mixture of iodine, iodine PENTAFLUORIDE at a temperature of 40 - 80oC, characterized in that the catalyst used metal surim

 

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