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Removed method for poisonous component of cleaved product in hexafluoropropylene manufacturing technique

A production process and cracking product technology, applied in chemical instruments and methods, organic chemistry, preparation of halogenated hydrocarbons, etc., can solve problems such as complex process routes in the production process of hexafluoropropylene, leakage of perfluoroisobutylene, threats to personal safety of employees, etc. To achieve the effect of guaranteeing personal safety, cleaning the production process, and reducing the pollution of three wastes

Active Publication Date: 2007-03-07
SHANDONG DONGYUE POLYMER MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing hexafluoropropylene production process, there is no good way to remove perfluoroisobutene, which has always existed from cracking to rectification. Due to the complicated production process and long process route of hexafluoropropylene, there is always perfluoroisobutene in the system. There is a risk of leakage, which poses a great threat to the surrounding environment and the personal safety of employees

Method used

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  • Removed method for poisonous component of cleaved product in hexafluoropropylene manufacturing technique
  • Removed method for poisonous component of cleaved product in hexafluoropropylene manufacturing technique

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Tetrafluoroethylene and C 318 Carry out cracking with the mixed charging capacity of 300Kg / h, in the cracking component, PFIB content is about 6%, and the material (cracking gas) that comes out from cracking furnace enters alcohols material absorption tower (adopted two-stage absorption among Fig. 1), alcohol Ethanol is used for absorption, and the spray volume of ethanol is 1-5m 3 / h, the absorption pressure is normal pressure or slightly positive pressure, and the temperature is about -10-120°C. After ethanol absorption, there is no peak of PFIB in the pyrolysis material. After the ethanol is absorbed, the material enters the compressor to increase the pressure to 0.2-0.6Mpa, and then enters the solvent absorption. The solvent absorption adopts 30% sodium carbonate aqueous solution, and the sodium carbonate aqueous solution is 1-5m 3 / h flow rate spraying to remove a small amount of alcohol and acidic substances in the system. The absorbed material enters the silica ...

Embodiment 2

[0016] According to Embodiment 1, methanol is used for alcohol absorption, and water is used for solvent absorption.

Embodiment 3

[0018] According to the first embodiment, methanol is used for alcohol absorption, 25% calcium chloride aqueous solution is used for solvent absorption, and solid sodium hydroxide is used for chemical absorption.

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Abstract

The invention discloses a removing method of toxic component in the hexafluoropropylene manufacturing technology, which comprises the following steps: adopting cracking gas in the manufacturing course to enter into distilling system before adsorbed by alcohol material to remove toxic component; proceeding solvent adsorption; purifying; proceeding chemical adsorption; adopting alcohol material as adsorbant; detoxifying octafluoroisobutylene in the cracking gas.

Description

technical field [0001] The invention relates to a process for removing toxic components of pyrolysis products in the production process of hexafluoropropylene. Background technique [0002] Hexafluoropropylene (Hexafluoropropene, referred to as HFP) is one of the important raw materials for fluorine-containing polymer materials, fluorine-containing intermediates and fluorine-containing fine chemicals. It is mainly used in the production of fluorine rubber, fluoroplastics and fluorine-containing fine chemicals. Applications. [0003] There are many production methods for hexafluoropropylene, including empty-tube pyrolysis of tetrafluoroethylene, mixed cracking of tetrafluoroethylene and inert gas, mixed cracking of tetrafluoroethylene and fluorocarbon high boilers, mixed cracking of tetrafluoroethylene and steam, etc. Among them, the most suitable process for industrial production and application is to use tetrafluoroethylene and recycled octafluorocyclobutane as raw materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C21/18C07C17/395
Inventor 张恒张振
Owner SHANDONG DONGYUE POLYMER MATERIAL
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