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A process and system for preparing polyoxymethylene dimethyl ether

A technology of polyoxymethylene dimethyl ether and process, which is applied in the production process and system field of polyoxymethylene dimethyl ether DMMn, can solve the problems affecting the conversion rate of formaldehyde and product selectivity, unfavorable reaction of synthetic DMMn, etc., and achieves Improve the conversion rate of raw materials, reduce energy consumption, and simplify the process

Active Publication Date: 2022-05-20
青岛迈特达新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the existing patented technology that uses formaldehyde aqueous solution as the reaction raw material, the reactor type it adopts makes water remain in the reaction system as an impurity all the time, and follows the reaction product and unconverted reaction raw material to flow out of the reactor at the same time, although from the technology It is feasible in terms of the route, but it is very unfavorable for the reaction of synthesizing DMMn. Even if the formaldehyde solution with a concentration of up to 88% is used, it still contains about 12% of water. These waters will significantly affect the conversion of formaldehyde as harmful impurities. rate and product selectivity

Method used

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  • A process and system for preparing polyoxymethylene dimethyl ether
  • A process and system for preparing polyoxymethylene dimethyl ether
  • A process and system for preparing polyoxymethylene dimethyl ether

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Embodiment 1

[0053] A process for preparing polymethoxy dimethyl ether DMM3-8, comprising the following contents:

[0054] The primary reaction equipment is a catalytic distillation tower. The reaction section in the tower is equipped with an appropriate amount of strong acidic cation exchange resin. The rectification section and stripping section in the tower are equipped with high-efficiency packing. The reaction raw material is a mixture of methylal, methanol and water. Wherein the mass fraction of each component is: methylal 96.2%, methanol 2.33%, water 1.47%.

[0055] The reaction raw materials are sent to the middle part of the reaction section of the catalytic rectification tower through the metering pump at a speed of 1000g / min, the pressure of the reaction section of the catalytic rectification tower is controlled to be 0.2MPaG, the temperature of the reaction section is controlled to be 75°C, and the reflux ratio of the catalytic rectification tower is controlled to be 5.0.

[0...

Embodiment 2

[0065] A process for preparing polymethoxy dimethyl ether DMM3-8, comprising the following contents:

[0066] The primary reaction equipment is a fixed bed reactor connected in series with a catalytic rectification tower. The fixed bed is equipped with a strong acidic cation exchange resin, and the reaction section of the catalytic rectification tower is equipped with a sufficient amount of strong acidic cation exchange resin. The distillation section is equipped with high-efficiency packing.

[0067] The reaction raw material is a mixture of methylal, methanol and formaldehyde aqueous solution, wherein the mass fraction of each component is: methylal 88.76%, methanol 1%, water 6.41%, formaldehyde 3.83%.

[0068] After the above reaction raw materials are preheated to 120°C, they are sent to the top of the fixed bed reactor by a metering pump at a speed of 500g / min. Under the action of a catalyst, the methylal in the reaction raw materials reacts with water and formaldehyde to...

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Abstract

The invention discloses a process for preparing polyoxymethylene dimethyl ether. The steps are as follows: first, methylal and water are used as primary reaction raw materials, and the reaction is carried out under the action of a catalyst in a primary catalytic rectification tower; Under the action of catalytic rectification, the methanol and part of the unconverted water formed by the reaction form an azeotrope with the methylal in the feed, and are continuously distilled out at the top of the first-stage catalytic rectification tower. The bottom of the distillation tower obtains primary reaction liquids with different concentrations of DMM2; then the primary reaction liquid is used as the secondary reaction raw material, and under the action of the catalyst in the secondary reaction equipment, the reaction generates methylal and DMM3-8 and obtains two Grade reaction liquid; then the secondary reaction liquid is sent to the separation unit for rectification and separation to obtain DMM3-8 products. The technological process of the invention has a simple process, reduces energy consumption and equipment investment, and significantly improves the conversion rate of raw materials.

Description

technical field [0001] The invention belongs to the technical field of chemical production technology, and in particular relates to a production technology and system of polymethoxy dimethyl ether DMMn. Background technique [0002] my country's resource endowment of "rich coal, poor oil, and little gas" determines the country's industrial policy of vigorously supporting and developing clean coal chemical industry and its downstream products. Polyoxymethylene dimethyl ether uses methanol as a raw material, which can act as a bridge between coal chemical industry and petrochemical industry. The development of advanced polyoxyl dimethyl ether production methods and devices is conducive to saving crude oil energy. For my country Energy storage and energy security have important strategic significance. [0003] The general structural formula of polyoxymethylene dimethyl ether is CH 3 O(CH 2 O)nCH 3 , referred to as DMMn or PODEn, etc., is currently recognized as an oxygen-enr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C43/30C07C41/56C07C41/58
CPCC07C41/56C07C41/58C07C43/30Y02P20/10
Inventor 张效龙王志亮孟祥发徐龙方高文斌冷桂玲
Owner 青岛迈特达新材料有限公司