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Method for removing hydrogen halide from fluorochlorohydrocarbon compound

A technology from chlorofluorocarbons and compounds, applied in the field of hydrogen halide removal, can solve the problems of increasing the water content of chlorofluorocarbons, increasing the consumption of manpower and material resources for dehydration, waste of raw materials, etc., and achieves the effect of high removal rate

Active Publication Date: 2015-04-15
太仓中化环保化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the following defects: one is that the hydrogen fluoride gas removed finally enters the waste water to form low-quality waste acid water, which not only causes waste of raw materials, but also is not conducive to subsequent waste water treatment; The moisture content increases, which increases the consumption of manpower and material resources for subsequent dehydration

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The adsorption tower is made of steel pipe of Φ25*1100mm, and 700g of polyacrylamide resin (Mitsubishi Nylon-MXD6) is installed inside. The HFC125 product (molar composition: HFC125 85%) is passed to the adsorption tower at a flow rate of 60L / h at 50℃1.0MPa , Hydrogen chloride 1%, hydrogen fluoride 14%; taken from the HFC125 catalyst evaluation device of Sinochem Taicang Environmental Protection Chemical Co., Ltd., the production process before the sampling point is the reaction of tetrachloroethylene and hydrogen fluoride under the action of the catalyst, and the materials after the reaction are removed by the hydrogen chloride distillation tower Most hydrogen chloride).

[0018] The hydrogen fluoride concentration in the HFC125 product after passing through the adsorption tower is 453ppm (molar content), the hydrogen chloride concentration is 500ppm (molar content), the hydrogen fluoride removal rate is 99.7%, and the hydrogen chloride removal rate is 95.0%. After the a...

Embodiment 2

[0020] Use 410 piperidine resin 700g (Beijing Institute of Chemical and Metallurgy of Nuclear Industry) as adsorbent to remove HFC125 (pentafluoroethane, production process and material composition are the same as in Example 1) hydrogen fluoride and hydrogen chloride in the material (devices are the same as in Example 1), pressure 0.6MPa, temperature 100℃, flow rate 60L / h, get hydrogen fluoride removal rate 99.7%, hydrogen chloride removal rate 95.1%, product hydrogen fluoride content 486ppm (mole content), hydrogen chloride content 495ppm (mole content), desorb at 180°C after ventilation In 1 hour, the obtained desorbed material is returned to the step of producing HFC125.

Embodiment 3

[0022] Using polyacrylamide resin (Mitsubishi Nylon-MXD6) 700g as the adsorbent to remove R245fa (pentafluoropropane, the molar composition is HFC245fa 87%, hydrogen chloride 1%, hydrogen fluoride 12%, taken from

[0023] Sinochem Taicang Environmental Protection Chemical Co., Ltd. R245fa catalyst evaluation device. The production process before the sampling point is that pentachloropropane reacts with hydrogen fluoride under the action of a catalyst. After the reaction, the material passes through the hydrogen chloride rectification tower to remove most of the hydrogen chloride.) The hydrogen fluoride and hydrogen chloride in the material are used The device is the same as in Example 1, with a temperature of -30°C under normal pressure and a flow rate of 60 L / h, obtaining a hydrogen fluoride removal rate of 99.5% and a hydrogen chloride removal rate of 95%. The hydrogen fluoride content in the product is 499 ppm (mole content) and hydrogen chloride content is 498 ppm (mole conte...

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Abstract

The invention relates to a method for removing hydrogen halide from a fluorochlorohydrocarbon compound. In the method, nitrogen-containing basic resin is used to adsorb and remove hydrogen halide in a fluorochlorohydrocarbon compound. The method has a high hydrogen halide removal rate; the hydrogen halide content of the product obtained by the method is lower than 0.05% and can optimally reach 5 ppm or below; no waste water is generated in the method; and after hydrogen halide is removed, no drying treatment is needed. In addition, the resin used as the adsorbent can be reutilized. The method provided by the invention is especially suitable for large-scale industrial production.

Description

technical field [0001] The present invention relates to a method for removing hydrogen halides from chlorofluorocarbons. Background technique [0002] The organic fluorine industry has a history of more than 50 years, and a relatively complete system has been formed both abroad and at home. With the rapid development of industrial production and science and technology, the variety and output of organic fluorine products are increasing day by day. [0003] Most organic fluorine products are usually obtained by organic synthesis using chlorofluorocarbons as raw materials. During the preparation of chlorofluorocarbons, a large amount of hydrogen fluoride and hydrogen chloride will be produced. When HCFCs are used as end products, it is required to separate and remove hydrogen fluoride and / or hydrogen chloride in HCFCs. However, the resulting hydrogen fluoride and hydrogen chloride cannot be completely removed from the chlorofluorocarbons after distillation or rectification s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C17/389C07C19/08C07C21/18
Inventor 刘伟胡欣王恩来梁成锋王军
Owner 太仓中化环保化工有限公司
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