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Method for preparing trifluorochloroethylene by halothane

A technology of chlorotrifluoroethylene and trifluoroethane, which is applied in the preparation of halogenated hydrocarbons, chemical instruments and methods, organic chemistry, etc., can solve the problem of high production cost of chlorotrifluoroethylene, and achieve low cost and high yield. Effect

Active Publication Date: 2012-08-01
CHANGSHU 3F FLUOROCHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of the disclosed process route of these documents is that the manufacturing cost of chlorotrifluoroethylene (CTFE) is on the high side, and the yield of the whole process is about 75%, which is obviously on the low side

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] exist A stainless steel tubular reactor is filled with a mixture of 3 kg of aluminum chloride, platinum chloride, palladium chloride and alumina, which contains 900 grams of aluminum chloride, 1980 grams of alumina, 90 grams of platinum chloride, and 30 grams of palladium chloride . The temperature of the reactor was raised to 350 °C, with N 2 The catalyst was activated for 10 hours and then cooled to 230°C. The feed rate of trifluoroethane was 1680 g / h, the feed rate of chlorine was 4970 g / h and the feed rate of hydrogen was 40 g / h. The product in the reactor is directly washed with water and alkali, then passed through a molecular sieve, condensed to collect chlorotrifluoroethylene and sampled for analysis. 2186.8 g of chlorotrifluoroethylene with a purity of 98.5% was obtained. Wherein the yield is 92.45%.

Embodiment 2

[0017] exist A stainless steel tubular reactor is filled with a mixture of 3 kg of aluminum chloride, platinum chloride, palladium chloride and alumina, which contains 477 grams of aluminum chloride, 2490 grams of alumina, 30 grams of platinum chloride, and 3 grams of palladium chloride . The temperature of the reactor was raised to 350 °C, with N 2 The catalyst was activated for 10 hours and then cooled to 300°C. The feed rate of trifluoroethane was 1680 g / h, the feed rate of chlorine was 4259 g / h and the feed rate of hydrogen was 55 g / h. The product in the reactor is directly washed with water and alkali, then passed through a molecular sieve, condensed to collect chlorotrifluoroethylene and sampled for analysis. 2185.3 g of chlorotrifluoroethylene with a purity of 98.7% was obtained. Wherein the yield is 92.57%.

Embodiment 3

[0019] exist A stainless steel tubular reactor is filled with a mixture of 3 kg of aluminum chloride, platinum chloride, palladium chloride and alumina, which contains 360 grams of aluminum chloride, 2550 grams of alumina, 60 grams of platinum chloride, and 30 grams of palladium chloride . The temperature of the reactor was raised to 350 °C, with N 2 The catalyst was activated for 10 hours and then cooled to 200°C. The feed rate of trifluoroethane was 1680 g / h, the feed rate of chlorine was 7100 g / h and the feed rate of hydrogen was 80 g / h. The product in the reactor is directly washed with water and alkali, then passed through a molecular sieve, condensed to collect chlorotrifluoroethylene and sampled for analysis. 2185.7 g of chlorotrifluoroethylene with a purity of 98.7% was obtained. Wherein the yield is 92.5%.

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Abstract

The invention discloses a method for preparing trifluorochloroethylene by halothane, which includes the step: subjecting the halothane to a reaction with chlorine and hydrogen in a fixed bed reactor respectively, wherein the chlorine is subjected to a reaction at a position of an inlet of the a reactor, the hydrogen is subjected to the reaction at the position 3m away from the inlet of the reactor, the temperature of the catalytic reaction is between 200 DEG C and 300 DEG C, the molar ratio of halothane and the chlorine is 1: (3-5), and the molar ratio of the halothane and the hydrogen is 1: (1-2). According to the method for preparing the trifluorochloroethylene by the halothane, traditional process is abandoned by the whole technological process, the trifluorochloroethylene is prepared by directly subjecting the halothane to respectively reacting with the chlorine and the hydrogen at different positions of the fixed bed reactor, and thereby the method is low in cost and high in yield.

Description

technical field [0001] The invention relates to a method for preparing chlorotrifluoroethylene, in particular to a method for preparing chlorotrifluoroethylene from trifluoroethane. Background technique [0002] Chlorotrifluoroethylene (CTFE) is the main monomer of fluororesin, fluoroplastic and fluororubber. Polytrifluorochloroethylene is widely used in electronic technology and military aviation fields. In particular, the excellent weather resistance and corrosion resistance of fluorine-containing coatings based on chlorotrifluoroethylene have been widely used in bridge and construction industries. [0003] At present, the annual output at home and abroad is about 10,000 tons. The main production route is tetrachloroethylene as the main raw material, which is chlorinated to produce hexachloroethane, and hexachloroethane is fluorinated to produce trifluorotrichloroethane. Chloroethane is dechlorinated under the action of zinc powder or hydrogen to obtain chlorotrifluoroet...

Claims

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Application Information

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IPC IPC(8): C07C21/18C07C17/10
Inventor 司林旭张平忠顾和祥
Owner CHANGSHU 3F FLUOROCHEM IND CO LTD
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