The method of obtaining pentafluoroethane and/or freon

 

(57) Abstract:

The invention relates to the development of industrial technology for Pentafluoroethane and/or freon fluoridation of paliperidone - titrator, trifter-defloration or their mixtures with cobalt TRIFLUORIDE. The process at 220 - 390oC and the concentration of active fluorine in the cobalt TRIFLUORIDE 5 to 12% can achieve output Pentafluoroethane to 67%, freon - up to 94% at high speed feeding of the original product. The optimum temperature for obtaining pentatomoidea - 220 - 260oC, to obtain freon - 320 - 390oC. for 3 h.p. f-crystals, 1 table.

The invention relates to methods for pendaftar and/or geksaftorida by fluorination of poliferation of Tetrafluoroethane or triptorelin or diflorasone, as well as their mixtures higher fluorides of metals of variable valence, in particular, cobalt TRIFLUORIDE (CoF3).

Pendaftar and HEXAFLUOROETHANE that have zero ozone-depleting potential are promising substitutes OzonAction halocarbons and are used as refrigerants, chemicals for dry etching in the manufacture of integrated circuits and other

Known with whom ratanov with fewer fluorine atoms CoF3how you can develop low-waste industrial technology, because the substitution of hydrogen by fluorine forms only one by-product hydrogen fluoride.

These methods involve laboratory method of fluorination of toratenu - Cryptor and Tetrafluoroethane at temperatures up to 170oC, supplied in a mixture with nitrogen (Journal of the Amtrican Chemical Society, 1950, No. 11, R. 4883). According to the information provided in the fluoridation of 1,1,2-triptorelin received 45% of 1,1,2,2-Tetrafluoroethane, 35% Pentafluoroethane, the content of unreacted raw product in the reaction mixture not specified. When fluoridation 1,1,2,2-Tetrafluoroethane received 50% of Pentafluoroethane and 10% freon, the contents of the original product in the reaction mixture is 40% decomposition or side connections are present. The process was conducted in a typical periodic reactor with a stirrer with flow source Tetrafluoroethane 8 cm3/h with a variable concentration of active fluorine in CoF3from 16% (immediately after regeneration) to almost zero content (before regeneration).

This method is adopted for the prototype because of other publications on the fluoridation of Tetrafluoroethane and triptorelin not found.

However, a number and a very small flow of the original fluorine-containing compounds, due to the need for maintaining the temperature for a given level;

the yield of the target products containing more than the initial compound amounts of fluoride, and the conversion of the original product is not high enough.

The objective of the invention to develop a process suitable for industrial implementation, it is necessary to increase the conversion of the original product and the yield of the target compounds with minimal formation of the degradation products at high productivity due to the optimum conditions of the process of fluoridation.

For solving the problem have been conducted a number of studies and experimentally established that in case of further fluorination polyfluorinated saturated aliphatic compounds, including trifter and tetraborates and differetn for optimum heat and mass transfer in the reaction zone, in addition to the optimal temperature regulated flow of the original product and heat, it is necessary that the concentration of active fluorine in CoF3it was constant and was in the range of 5 to 12% of the process Temperature 220 390oC. in the case of pre-emptive get Pentafluoroethane must maintain a temperature of 220 2603carried out at elevated temperature, but unlike the prototype, the concentration of active fluorine in CoF3maintained within the range of 5 to 12% and the temperature is within 220 390oC, while in the case of obtaining Pentafluoroethane temperature 220 260oC, as in the case of obtaining freon-320 - 390oC, subject to these parameters, satisfactory results were obtained during the fluoridation of differetn.

Under these conditions in the reaction zone is created heat and mass transfer mode, providing high conversion of the original product in the target compounds at a high speed feeding of raw materials (flow rate of 3 kg/h), making the process suitable for industrial implementation. When the concentration of active fluorine of below 5% under other equal conditions, the yield of target products is reduced, and when the content of above 12%, the process is unstable with parallel flow destructive reactions at temperatures below 220oC to achieve high yield feedstock must be submitted with a small flow rate, which excludes industrial application of the method. At temperatures above 390oC observed destructive processes.

The experiments were conducted in a flow reactor with schneimi to transport cobalt TRIFLUORIDE. Loaded with 400 kg of cobalt TRIFLUORIDE.

The obtained results of the experiments the data presented in the table.

From the presented experimental data shows that at the same temperature and flow rate (op.7,15,16) the best results obtained when carrying out the process in the proposed limits on the concentration of active fluorine, in experiments 2, 6, 12, 13 shows the effect of temperature under the same concentration of active fluorine. When fluoridation of differetn form low-boiling impurities in an amount of not more than 2 at a high yield of freon.

Thus, when carrying out the process in the proposed conditions of high output and conversion can be obtained at considerable expense source Tetrafluoroethane, which, in turn, makes the process industrially applicable.

1. The method of obtaining Pentafluoroethane and/or freon fluoridation of paliperidone or their mixture with cobalt TRIFLUORIDE at elevated temperature, wherein the process is conducted at a constant concentration of active fluorine in the cobalt TRIFLUORIDE in the range 5 to 12 wt. and a temperature of 220 390oC.

2. The method according to p. 1, characterized in that in the case of obtaining Pentafluoroethane Itana the process is conducted at 320 390oC.

4. The method according to p. 1, characterized in that as poliferation take Tetra-, tri - or deperately or mixtures thereof.

 

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3 cl, 4 ex

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2 cl, 7 tbl, 7 ex

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EFFECT: improved halogenation method.

33 cl, 1 tbl, 1 ex

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1 ex, 1 dwg

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EFFECT: the invention ensures suppression of the inhibition of the chlorination process of methylene chloride at usage of the electrolysis chlorine, the increased conversion of chlorine and selectivity for chloroform.

5 cl, 4 ex, 1 tbl

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