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Production process for s-trioxane and extraction reaction tower

A paraformaldehyde and production process technology, applied in solvent extraction, separation methods, chemical instruments and methods, etc., can solve the problems of large equipment investment, large steam consumption, reaction and separation, etc., to reduce steam energy consumption and improve conversion rate , the effect of reducing the difficulty of refining

Pending Publication Date: 2017-12-15
湖北三里枫香科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] This process requires a large amount of steam for reaction and separation, and the maximum conversion rate of formaldehyde does not exceed 30%, and it needs to go through multi-stage reactor reflux reaction, which requires a large investment in equipment.

Method used

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  • Production process for s-trioxane and extraction reaction tower
  • Production process for s-trioxane and extraction reaction tower
  • Production process for s-trioxane and extraction reaction tower

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Such as Figure 1~2 As shown, the extraction reaction tower of the present invention includes a tower body, and multi-stage extraction reaction units are arranged from bottom to top in the tower, and adjacent ones are separated by trays, and a plurality of through holes are provided on the trays, and each layer of trays A downcomer is provided on the top. The space between adjacent trays is used as the extraction reaction section of the extraction reaction unit, and the solid acid packing layer is fixedly installed in the upper part of the section. The bottom of the tower is provided with a distributor and is connected to the delivery pipe of the extractant benzene, the top of the tower is provided with a reactant extraction port and is connected with the extraction pipe, and the upper part of the tower is provided with a formaldehyde delivery port for the formaldehyde solution to enter. Benzene enters from the bottom of the tower and is distributed into the tower thro...

Embodiment 2

[0026] Such as image 3 In this embodiment, the solid acid catalyst is directly placed in the downcomer, and when the formaldehyde solution flows through the downcomer from the upper extraction reaction unit, it contacts with the solid acid catalyst to undergo a polymerization reaction.

Embodiment 3

[0028] In this embodiment, the solid acid catalyst is placed in the external reactor by installing an external suspension outside the tower, and the formaldehyde solution descending from the upper layer is sent into the external reactor through a circulation pump and pipeline for polymerization reaction, and the product of the polymerization reaction is sent to the external reactor. After returning, it enters the extraction reaction unit of the lower layer, the organic phase rises, and the water phase descends. In this embodiment, the residence time of the formaldehyde solution in the catalyst can be ensured to improve the reaction conversion rate.

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Abstract

The invention discloses a production process for s-trioxane and an extraction reaction tower. Specifically, the extraction reaction tower includes an extraction agent inlet disposed at the bottom, a reactant recovery port arranged at the top, and multiple stages of extraction reaction units arranged sequentially from the bottom up. Adjacent extraction reaction units are separated by perforated tower plates, also downcomers are disposed between adjacent extraction reaction units, and the extraction reaction units are internally provided with a solid acid catalyst. The production process for s-trioxane and the extraction reaction tower provided by the invention can reach a formaldehyde conversion rate of more than 45%, and also have the characteristics of small steam consumption in the reaction process, and low equipment investment and the like.

Description

technical field [0001] The invention belongs to the technical field of energy and chemical engineering, and in particular relates to an industrial production process and device of paraformaldehyde. Background technique [0002] At present, the production method of paraformaldehyde is to concentrate 37% formaldehyde aqueous solution at a temperature of about 56°C to obtain 60wt% concentrated formaldehyde as a raw material, and then use sulfuric acid as a catalyst to polymerize at 101-106°C, and The paraformaldehyde product is obtained by continuous cooking. [0003] This process requires a large amount of steam for reaction and separation, and the maximum conversion rate of formaldehyde is not more than 30%. It also needs to go through multi-stage reactor reflux reaction, and the investment in equipment is large. Contents of the invention [0004] Purpose of the invention: for the above-mentioned existing problems and deficiencies, the purpose of the invention is to provid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D323/06B01D11/04B01J8/04
CPCB01D11/043B01J8/0411C07D323/06
Inventor 朱怀工张鸿伟周淑敏黄隆君
Owner 湖北三里枫香科技有限公司
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