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Device and method of utilizing catalytic distillation coupling technology to produce high-purity methylal

A catalytic distillation and catalytic distillation tower technology, applied in the field of high-purity methylal production using catalytic distillation coupling technology, can solve the problems of low production efficiency, long process, low purity, etc., and achieve environmentally friendly production conditions, mild process conditions, and process short process effect

Pending Publication Date: 2018-08-21
KAIRUI ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the technical methods for producing methylal are fixed bed + pressurized distillation. Due to the azeotropic phenomenon of methanol and methylal, this method not only has low production efficiency, but also has high energy consumption. Long, large investment, low purity, poor product quality and many other defects

Method used

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  • Device and method of utilizing catalytic distillation coupling technology to produce high-purity methylal
  • Device and method of utilizing catalytic distillation coupling technology to produce high-purity methylal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] A kind of method utilizing catalytic distillation coupling technology to produce high-purity methylal, comprises the following steps:

[0061] (1) formaldehyde aqueous solution, methyl alcohol enter in catalytic distillation tower 1 respectively from formaldehyde import 1, methanol import, under the catalysis action of catalyst in it, react; The tower bottom of catalytic distillation tower 1 obtains water, and is discharged by water outlet, The top of the catalytic distillation tower I obtains the azeotrope, and is discharged from the azeotrope outlet, and the azeotrope is methylal containing methanol; the azeotrope flows through the condenser I, the reflux tank I, and the reflux pump I successively, A part is refluxed by the azeotrope reflux port to the catalytic distillation tower I for reflux, and the other part enters the catalytic distillation tower II by the azeotrope inlet;

[0062] In the described formaldehyde aqueous solution, the mass fraction of formaldehyde...

Embodiment 2

[0077] A method for producing high-purity methylal using catalytic distillation coupling technology, other process conditions and methods are the same as in Example 1, the difference is: ① The stripping section of catalytic distillation tower I and catalytic distillation tower II is designed as a sieve plate, and the sieve plate It is a high-efficiency floating valve sieve plate, the number of layers of the sieve plate is N=10, and the distance between the layers is 450mm; ②The catalysts in the catalytic section of the catalytic distillation tower I are the KCD006 resin catalysts produced by our company. The catalyst filled in the catalytic section of the distillation tower II is the D006 resin catalyst produced by our company; the yield of methylal is 99.6%, and the purity is 99.6%.

Embodiment 3

[0079]A kind of method that utilizes catalytic distillation coupling technology to produce high-purity methylal, other process conditions and method are the same as embodiment 1, difference is: 1. the catalyst that the catalytic sections of catalytic distillation tower I and catalytic distillation tower II are all packed is all this The D008 resin catalyst produced by the company; ②The catalysts are packed in bulk; the yield of methylal is 99.4%, and the purity is 99.4%.

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Abstract

The invention discloses a device and a method of utilizing catalytic distillation coupling technology to produce high-purity methylal. The device comprises a catalytic distillation tower I and a catalytic distillation tower II which are completely identical in inside structure and connected with each other. The catalytic distillation towers completely identical in structure are used, a method of enabling methanol and formaldehyde to be excessive alternately is used under action of a solid acid catalyst, both chemical balance and a co-boiling principle of methylal and methanol are broken, and the objective of refining high-purity methylal is achieved in one step. A high-purity methylal product is produced by adopting the catalytic distillation coupling method, so that the defects of other technologies like pressurization technology and extraction technology are overcome, and a new production technique having the advantages of mild process condition, short technical process, little investment, high efficiency, low consumption and environment-friendly production condition is created.

Description

technical field [0001] The invention relates to a device and method for producing methylal, in particular to a device and method for producing high-purity methylal using catalytic distillation coupling technology. It is a device and process method for producing high-purity methylal by coupling formaldehyde aqueous solution and methanol by using the double catalytic distillation tower technology. Background technique [0002] Methylal is the main raw material for producing polyoxymethylene dimethyl ether, and the technical standards of polyoxymethylene dimethyl ether products are relatively high. Therefore, there are also high requirements on the quality level of the raw material methylal, that is, its purity is required to be quite high. At present, most of the technical methods for producing methylal are fixed bed + pressurized distillation. Due to the azeotropic phenomenon of methanol and methylal, this method not only has low production efficiency, but also has high ener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C41/56C07C41/58C07C43/30
CPCC07C41/56C07C41/58C07C43/30Y02P20/584Y02P20/10
Inventor 毛进池刘文飞郭为磊靳增峰张长胜
Owner KAIRUI ENVIRONMENTAL PROTECTION TECH
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