High-purity trioxymethylene refining system and process

A technology of high-purity paraformaldehyde and refining system, which is applied in the field of high-purity paraformaldehyde refining system and technology, can solve the problems that the purity of paraformaldehyde is difficult to meet the demand, the effect of paraformaldehyde refining is limited, etc., and achieve repeated recycling , help to purify, improve the effect of purity

Pending Publication Date: 2021-11-05
YANKUANG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing gas-liquid extraction process currently has a limited effect on the purification of paraformaldehyde, and the purity of paraformaldehyde is difficult to meet the demand. Therefore, a simple, low-cost, and highly purified paraformaldehyde refining process will be explored. of great significance

Method used

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  • High-purity trioxymethylene refining system and process
  • High-purity trioxymethylene refining system and process

Examples

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Embodiment 1

[0051] Such as figure 1 As shown, the present embodiment provides a high-purity paraformaldehyde refining system, comprising a gas-liquid extraction tower 1 and a benzene recovery tower 2, a water washing tower 3 is arranged between the gas-liquid extraction tower and the benzene recovery tower, and the inlet of the water washing tower 3 The first stratifier 4 is arranged at the place, and the paraformaldehyde crude gas first enters the gas-liquid extraction tower to extract with benzene, and the solution collected at the bottom of the tower is first separated from the heavy phase (dilute aldehyde aqueous solution) by the first stratifier 4, It is then passed into a water washing tower for water washing, and after dilute aldehyde impurities are further removed, the overflow liquid is collected from the top of the water washing tower and passed into a benzene recovery tower to separate benzene and paraformaldehyde.

[0052] Among them, the gas-liquid extraction tower 1 is equip...

Embodiment 2

[0059] The present embodiment provides a kind of technique that adopts the system in embodiment 1 to carry out paraformaldehyde refining, specifically:

[0060] Firstly, pass the paraformaldehyde crude gas into the gas-liquid extraction tower, and under the condition of operating pressure of -15KPa and tower top operating temperature of 68°C, the extractant benzene is pressurized by the benzene reflux pump and sprayed down from the upper part of the tower , fully contact with crude paraformaldehyde gas to achieve efficient extraction of paraformaldehyde.

[0061] Then, collect the solution at the bottom of the gas-liquid extraction tower, first separate the heavy phase (dilute aldehyde aqueous solution) by the first stratifier 4, then pass into the water washing tower for washing, and the overflow liquid at the top of the water washing tower is imported into the benzene recovery tower, At the same time, TEA, IRG259 and desalted water are added to the benzene recovery tower to ...

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Abstract

The invention relates to the field of chemical synthesis processes, in particular to a high-purity trioxymethylene refining system and process. The system comprises a gas-liquid extraction tower and a benzene recovery tower; a water washing tower is arranged between the gas-liquid extraction tower and the benzene recovery tower; and trioxymethylene crude gas firstly enters the gas-liquid extraction tower to be extracted with benzene, a solution at the tower bottom enters the water washing tower to be washed, overflow liquid at the tower top of the water washing tower enters the benzene recovery tower for benzene separation, and refined high-purity trioxymethylene is obtained. According to the process, the problems of high formic acid content, high water content and the like in the trioxymethylene component can be solved, the trioxymethylene content is increased to 99.9%, and a high-quality comonomer is provided for polymerization reaction.

Description

technical field [0001] The invention relates to the field of chemical synthesis technology, in particular to a high-purity paraformaldehyde refining system and technology. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Polyoxymethylene is a kind of thermoplastic engineering plastic. Because of its regular molecular structure and good crystallinity, it has good mechanical properties, electrical properties and chemical resistance properties, so it is widely used in office and household appliances, precision instruments, automobiles and other industries. The key components. Among them, the application threshold of the automotive industry is relatively high, and in addition...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D323/06
CPCC07D323/06
Inventor 蒋兴涛李志远龙厚坤沈祺李晓莉王朦朦张世奎朱超王玉聪吴晓苹
Owner YANKUANG GRP CO LTD
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