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Method for removing hydrogen fluoride in tetrafluoroethylene production process

A production process, tetrafluoroethylene technology, applied in the direction of chemical instruments and methods, chlorine/hydrogen chloride, chlorine/hydrogen chloride purification, etc., can solve the problems of excessive fluoride ion content, reduced operating rate of equipment, low quality, etc., to achieve good economy and Social benefit, reduction of hydrogen fluoride content, effect of reducing fluoride ion content

Active Publication Date: 2019-08-06
ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. It will aggravate the corrosion of equipment, cause frequent accidents, reduce the operating rate of the device, and cause frequent safety accidents
[0005] 2. It will enter the by-product hydrochloric acid and affect the quality of hydrochloric acid, making it difficult to sell, and the expansion of hydrochloric acid is a problem in the fluorine chemical industry
[0006] 3. It will enter the follow-up system with the material and affect the quality of tetrafluoroethylene. The quality of domestic high-end polytetrafluoroethylene resin products is generally lower than that of foreign countries. The reason is also related to the hydrogen fluoride contained in tetrafluoroethylene monomer.
Tetrafluoroethylene monomer contains a small amount of hydrogen fluoride, which will affect the quality of tetrafluoroethylene polymerization products, and at the same time affect the quality of by-product hydrochloric acid, making its fluoride ion content exceed the standard, affecting sales

Method used

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  • Method for removing hydrogen fluoride in tetrafluoroethylene production process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] see figure 1 , the system used for removing hydrogen fluoride used in the method comprises a defluorination tower 1 clarification stratified tank 2, a mixer 3, and a regeneration tower 4;

[0038] The top of the defluorination tower is connected with a cracked gas feed pipe 101 and a defluorination agent feed pipe 102, and the gas phase material outlet 103 provided at the bottom of the defluorination tower is used to transport the defluorination cracked gas to the follow-up system; the defluorination tower The bottom is connected to the clarified stratified tank 2 through a pipeline, and the clarified stratified tank is connected to the mixer 3 through a pipeline, and the mixer 3 is connected to the regeneration tower 4; the lower part of the regeneration tower is passed through a lye circulation pipeline It is connected to the mixer; the bottom of the regeneration tower is provided with a sodium fluoride waste liquid discharge port 401, and an emptying valve 402 is pro...

Embodiment 2

[0047] Adopt and the system of embodiment 1 system, the operation of removing hydrogen fluoride comprises steps:

[0048] The first step is defluorination by extraction reaction: the cracked gas containing tetrafluoroethylene, water vapor and hydrogen fluoride flows into the defluorinator in parallel with the defluorinating agent from the regeneration tower at 135-150 ° C, and the cracked gas after defluorination goes to In the follow-up system, the mixed liquid after defluorination enters the clarification and stratification tank. The defluorinating agent is tetrabutoxysilane, the density is 0.899g / m 3 The amount of additional defluorination agent relative to the cracked gas material is 0.3kg / t; the defluorination pressure is controlled to 0.05Mpa, the defluorination temperature is 45°C; the liquid-gas mass ratio is 7:1; the residence time of the material in the defluorination device is 2~ 3min.

[0049] The second step is clarification and stratification: the mixed liquid ...

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Abstract

The invention provides a method for removing hydrogen fluoride in a tetrafluoroethylene production process. The method comprises: 1) carrying out extraction defluorination; 2) carrying out clarification layering, wherein the upper layer is a desorption agent after the extraction reaction, and enters a regeneration tower, and the lower layer is hydrogen fluoride-free hydrochloric acid, and enters an acid groove; and 3) regenerating a defluorination agent, wherein a defluorination agent from a clarification layering groove and a circulating alkali liquid from a regeneration tower kettle are mixed in the regeneration tower while a fresh alkali liquid is intermittently supplemented to a mixer. According to the present invention, with the method, the hydrogen fluoride content in the cracked product is effectively reduced, such that the good defluorination effect is achieved, the defluorination agent consumption is less, and the cost is low; and the operation of the process is simple, and the method can achieve industrial automation.

Description

technical field [0001] The invention relates to the field of organic chemistry, in particular to a method for purifying tetrafluoroethylene. Background technique [0002] The production of tetrafluoroethylene is a high-temperature cracking process. The current fluorine chemical industry mainly uses superheated steam to crack difluorochloromethane (F22) to produce tetrafluoroethylene. A small amount of hydrogen fluoride will be produced during the production process, and its content is about 0.5%. (mass percentage). As a by-product of the production of tetrafluoroethylene monomer, hydrogen fluoride has not been reported how to remove it due to its low content, high processing cost and high technical difficulty. [0003] Presence of hydrogen fluoride: [0004] 1. It will aggravate the corrosion of equipment, cause frequent accidents, reduce the operating rate of the device, and cause frequent safety accidents. [0005] 2. It will enter the by-product hydrochloric acid and a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C21/185C07C17/395C01B7/07
CPCC01B7/0731C07C17/395C07C21/185
Inventor 谢小刚曾本忠李斌谭建明
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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