Method for producing 1,2-dipertahankan

 

(57) Abstract:

Method for producing 1,2-dipertahankan relates to chemical technology of production of halocarbons (freons) and can be used to obtain 1,2-dipertahankan (halon 122) relating to perchloromethane low ozone depleting potentials. The method consists in the processing of dispersed trichloroethylene evaporated by uranium hexafluoride, which is diluted with an inert gas, when the reagent ratio close to stoichiometric. What's new is that in the response zone simultaneously with the source reagents injected condensed 1,2-dipertahankan or treatment products in the amount of 0.3 to 2.5 mol of 1,2-dipertahankan on 1 mol of uranium hexafluoride. The method allows to increase the yield of the target product on organic raw materials to 96.3% and significantly improve its quality by reducing the impurity content of trichloroethylene and other impurities. table 1.

The present invention relates to methods of producing halocarbons and can be used to obtain 1,2-dipertahankan (halon 122) relating to perchloromethane with low ozone-depleting ability.

The replacement of freon to keep the ASS="ptx2">

One of these halocarbons that are of practical interest, is 1,2-dipertahankan.

A known method of producing uranium tetrafluoride and 1,2-dipertahankan by fluorination of trichloroethylene by uranium hexafluoride (U.S. patent N 3382049, CL 23 353, 1968).

The method was designed to obtain uranium tetrafluoride and did not aim to obtain organic product with high quality and output.

The closest in technical essence and the achieved result to the present invention is a method of producing 1,2-dipertahankan by processing at elevated temperatures dispersed trichloroethane evaporated by uranium hexafluoride, diluted with an inert gas (nitrogen, argon, etc.,), when the reagent ratio close to the stoichiometric (see RF patent N 2030380 "a Method for obtaining fluorine-containing ethane series").

The disadvantage of this method is the low quality and low yield of 1,2-dipertahankan: experimental-industrial tests of the method have shown that the product is contaminated with impurities organofluorine compounds, including admixture of tryptophanate. This mixture has a boiling temperature close to the temperature of the Sabbath./P> The reason for the low quality of the target product by a known method is unacceptably high temperatures in the response zone, causing the occurrence of several adverse reactions.

The reaction of interaction of trichloroethylene with uranium hexafluoride is accompanied by the evolution of considerable heat.

The known method does not provide the possibility of fast and efficient removal of heat of reaction, resulting in the points of contact of the reacting substances can develop high temperature (>400oC).

The proposed method allows to eliminate the disadvantage of this method. It is based on the fact that in the known method for producing 1,2-deverticalization by processing the dispersed trichloroethylene evaporated by uranium hexafluoride, diluted with an inert gas, when the reagent ratio close to the stoichiometric in the response zone simultaneously with the source reagents injected condensed recycled 1,2-dipertahankan or treatment products in the amount of 0.3 to 2.5 gram-moles per gram mole of uranium hexafluoride.

Example 1.

In a laboratory reactor in the response zone served continuously evaporated exaptation. The molar ratio of the uranium hexafluoride:trichloroethylene:1,2-dipertahankan support equal to 1: 1:2.

The resulting tetraploid uranium is poured into the lower part of the reactor and accumulates there, and organic reaction products continuously away from the reactor, condensed and analyzed.

The results of the analyses, wt%

1,2-Dipertahankan 94,8

The halon 121 0,7

Refrigerant-123 0,3

Ferrichloride (C2FCl3) 0.02

Refrigerant-114 0,9

Refrigerant-113 1,0

Trichloroethylene 1,6

Other impurities 0,7

The mass yield of halon 122, calculated as the ratio of the percentage of halon 122 to the sum of the percentage contents of organic products (i.e. excluding unreacted trichloroethylene) is 96,3%

Example 2.

Conduct a series of experiments similar to example 1, in which the change amount of HFC 122 supplied in the response zone. In one of the tests (op. N 6) in the response zone serves condensed organic products obtained in example 1.

The results of all experiments are summarized in table.

The data presented show that the proposed method allows to obtain 1,2-dipertahankan with a minimum content of n is from 0.3 to 2.5 mole of condensed 1,2-dipertahankan on one mol of uranium hexafluoride.

At a flow rate of 1.2-dipertahankan on 1 mol of uranium hexafluoride less than 0.3 mol of the positive effect is markedly reduced, and the consumption of more than 2.5 mmol per 1 mol of uranium hexafluoride to further increase the quality and yield of 1,2-dipertahankan does not.

Method for producing 1,2-dipertahankan by processing the dispersed trichloroethylene evaporated by uranium hexafluoride, diluted with an inert gas, when the reagent ratio close to the stoichiometric characterized in that the response zone simultaneously with the source reagents injected condensed 1,2-dipertahankan or treatment products in the amount of 0.3 to 2.5 mol of 1,2-dipertahankan on 1 mol of uranium hexafluoride.

 

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