Unlock instant, AI-driven research and patent intelligence for your innovation.

Production method of vinylidene fluoride monomer

A technology of vinylidene fluoride and production method, which is applied in chemical instruments and methods, preparation of halogenated hydrocarbons, preparation of dehydrohalogenation, etc., can solve problems such as the influence of production operations and the purity of product VDF, and achieve the effect of removing impurities

Inactive Publication Date: 2014-03-26
CHANGSHU 3F ZHENFU NEW MATERIALS CO LTD
View PDF4 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the actual production process of this method, there is no suitable way to extract the impurities contained in the cracked gas from the rectification system, and most of them are recycled back to the previous process, and the existence and accumulation of impurities will affect the purity of the product VDF , and will have a relatively large impact on actual production operations

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A kind of production method of vinylidene fluoride monomer comprises the steps:

[0016] 1) Using difluoro-chloroethane as raw material, cracking by empty tube or water vapor dilution;

[0017] 2) Pre-treatment: carbon removal, water washing, alkali washing, compression, cold removal;

[0018] 3) Vinylidene fluoride removal tower removes light components;

[0019] 4) Vinylidene fluoride rectification tower to obtain vinylidene fluoride monomer;

[0020] 5) The side line impurity removal tower removes impurities and high-boilers, recovers vinylidene fluoride from the top of the tower, and extracts high-boiler impurities from the bottom of the tower. The pressure drop of the whole tower is controlled at 9KPa, and the molar reflux ratio is 80;

[0021] 6) Recovery of vinylidene fluoride monomer and difluorochloroethane that did not participate in the reaction.

Embodiment 2

[0023] A kind of production method of vinylidene fluoride monomer comprises the steps:

[0024] 1) Using difluoro-chloroethane as raw material, cracking by empty tube or water vapor dilution;

[0025] 2) Pre-treatment: carbon removal, water washing, alkali washing, compression, cold removal;

[0026] 3) Vinylidene fluoride removal tower removes light components;

[0027] 4) Vinylidene fluoride rectification tower to obtain vinylidene fluoride monomer;

[0028] 5) The side line impurity removal tower removes impurities and high-boilers, recovers vinylidene fluoride from the top of the tower, and extracts high-boiler impurities from the bottom of the tower. The pressure drop of the whole tower is controlled at 9KPa, and the molar reflux ratio is 80;

[0029] 6) Recovery of vinylidene fluoride monomer and difluorochloroethane that did not participate in the reaction.

Embodiment 3

[0031] A kind of production method of vinylidene fluoride monomer comprises the steps:

[0032] 1) Using difluoro-chloroethane as raw material, cracking by empty tube or water vapor dilution;

[0033] 2) Pre-treatment: carbon removal, water washing, alkali washing, compression, cold removal;

[0034] 3) Vinylidene fluoride removal tower removes light components;

[0035] 4) Vinylidene fluoride rectification tower to obtain vinylidene fluoride monomer;

[0036] 5) The side line impurity removal tower removes impurities and high-boilers, recovers vinylidene fluoride from the top of the tower, and extracts high-boiler impurities from the bottom of the tower. The pressure drop of the whole tower is controlled at 9KPa, and the molar reflux ratio is 80;

[0037] 6) Recovery of vinylidene fluoride monomer and difluorochloroethane that did not participate in the reaction.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a production method of a vinylidene fluoride monomer. The production method comprises the following steps: 1), chlorodifluoroethane is adopted as a raw material and subjected to blank pipe pyrolysis or vapor dilution pyrolysis; 2), pretreatment including carbon removal, water washing, alkali washing, compression and cooling dehydration is performed; 3), light components are removed by a vinylidene fluoride light component removing column; 4), the vinylidene fluoride monomer is obtained by a vinylidene fluoride rectifying column; 5), impurities and high-boiling residues are removed by a siding impurity removing column, vinylidene fluoride is recovered at column top and column bottom, high-boiling residue impurities are withdrawn from the column bottom, the temperature at the column top is subzero 35 DEG C, the temperature at the column bottom is 90-95 DEG C, the pressure at the column top is 2 MPa, the pressure drop of the whole column is controlled to be 9 KPa, and a mole reflux ratio is 80; and 6), the vinylidene fluoride monomer and chlorodifluoroethane which is not participated in a reaction are recovered. The production method of the vinylidene fluoride monomer can remove the impurities contained in pyrolysis gas effectively.

Description

technical field [0001] The present invention relates to a production method of vinylidene fluoride monomer. Background technique [0002] The current method for producing VDF monomer mainly uses difluoro-chloroethane as a raw material, through empty pipe cracking or water vapor dilution cracking, after a series of pretreatment steps, and finally through rectification to obtain VDF monomer. In the actual production process of this method, there is no suitable way to extract the impurities contained in the cracked gas from the rectification system, and most of them are recycled back to the previous process, and the existence and accumulation of impurities will affect the purity of the product VDF , and will have a relatively large impact on actual production operations. Contents of the invention [0003] The object of the present invention is to provide a production method of vinylidene fluoride monomer, which can effectively remove impurities contained in cracked gas. [...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C07C21/18C07C17/25C07C17/383
Inventor 徐建林邹建良宗建青仇峰
Owner CHANGSHU 3F ZHENFU NEW MATERIALS CO LTD