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Production process method of polyoxymethylene dimethyl ether

A polymethoxy dimethyl ether and production process technology, applied in the field of polymethoxy dimethyl ether production process, can solve the problem of low concentration of DMMn products, affecting the stable operation of a synthesis and separation system, and difficulty in separating target products, etc. problem, to achieve the effect of high concentration, improve the utilization rate of raw materials, and reduce production costs

Pending Publication Date: 2022-07-01
SEDIN ENG +1
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process method not only solves the problems of low concentration of DMMn products and difficult separation of target products in the existing industrial technology, but also solves the problem of H in the existing production engineering. 2 The problem that the environment affects the stable operation of the entire synthesis and separation system provides a process route with industrial prospects for the production of DMMn

Method used

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  • Production process method of polyoxymethylene dimethyl ether

Examples

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Embodiment 1

[0030] like figure 1 As shown, the production process method of polymethoxydimethyl ether in the present embodiment comprises the following steps:

[0031] S1, the raw material formaldehyde solution and the formaldehyde solution extracted from the top of the dilute aldehyde rectifying tower 15 are mixed and then enter the formaldehyde evaporator 2 through the demetallization reactor 1 to remove the metal ions, and the operating pressure is an absolute pressure of 0.008MPa, and the temperature is 55 ℃, after the formaldehyde evaporator 2 is heated, it is sent to the vacuum flash tank 3. The operating pressure of the vacuum flash tank 3 is an absolute pressure of 0.008MPa, and the concentrated formaldehyde solution of 56wt% is concentrated at the bottom of the vacuum flash tank 3. The vacuum flash tank 3. The dilute aldehyde gas at the top enters the dilute aldehyde condenser 4 and is condensed to obtain a 19wt% dilute aldehyde solution and is temporarily stored in the dilute al...

Embodiment 2

[0038] like figure 1 As shown, the production process method of polymethoxydimethyl ether in the present embodiment comprises the following steps:

[0039] S1, the raw material formaldehyde solution and the formaldehyde solution extracted from the top of the dilute aldehyde rectifying tower 15 are mixed and enter the formaldehyde evaporator 2 through the demetallization reactor 1 to remove the metal ions, and the operating pressure is an absolute pressure of 0.02MPa, and the temperature is 67 ℃, after the formaldehyde evaporator 2 is heated, it is sent to the vacuum flash tank 3, the operating pressure of the vacuum flash tank 3 is 0.02MPa absolute, and the concentrated formaldehyde solution of 69wt% is concentrated at the bottom of the vacuum flash tank 3, and the vacuum flash tank 3. The dilute aldehyde gas at the top enters the dilute aldehyde condenser 4 and is condensed to obtain a 16 wt% dilute aldehyde solution and is temporarily stored in the dilute aldehyde tank 5. Th...

Embodiment 3

[0046] like figure 1 As shown, the production process method of polymethoxydimethyl ether in the present embodiment comprises the following steps:

[0047] S1, the raw material formaldehyde solution and the formaldehyde solution extracted from the top of the dilute aldehyde rectifying tower 15 are mixed and then enter the formaldehyde evaporator 2 through the demetallization reactor 1 to remove the metal ions, and the operating pressure is an absolute pressure of 0.035MPa, and the temperature is 76 ℃, after the formaldehyde evaporator 2 is heated, it is sent to the vacuum flash tank 3, the operating pressure of the vacuum flash tank 3 is 0.035MPa absolute pressure, and the concentrated formaldehyde solution of 78wt% is concentrated at the bottom of the vacuum flash tank 3, and the vacuum flash tank 3. The dilute aldehyde gas at the top enters the dilute aldehyde condenser 4 and is condensed to obtain a 12wt% dilute aldehyde solution and is temporarily stored in the dilute alde...

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Abstract

The invention provides a production process method of polyoxymethylene dimethyl ether, and belongs to the field of chemical production processes. The method provided by the invention is an integral process comprising synthesis, separation and solvent recovery of trioxymethylene, synthesis and separation of methylal, and synthesis and separation of DMMn, reaction raw materials trioxymethylene and methylal with high concentration and extremely low water content are obtained on the premise of entering a DMMn reactor, negative effects of water in a reaction system on the DMMn synthesis process are avoided, and the method is suitable for industrial production. Meanwhile, the problem that a DMMn target product is difficult to separate in a subsequent process due to an azeotropic system existing in a large amount of water can be avoided, and the target product is stable in quality and high in concentration ratio; recycling and cyclic utilization of circulating materials such as methanol, formaldehyde, trioxymethylene, methylal, DMM2 and DMM larger than or equal to 7 in the process are achieved, the utilization rate of the raw materials is increased, and meanwhile emission of pollutants is reduced. Coupling of heat and recycling of waste heat in the production process are fully considered, the overall energy consumption is reduced, and the production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of chemical production technology, in particular to a production technology method of polymethoxydimethyl ether. Background technique [0002] Polyoxymethylene dimethyl ethers (PODEn or DMMn for short) is a polyether compound with the chemical formula CH 3 O(CH 2 O)nCH 3 , the main application areas are diesel additives and environmentally friendly solvents. Due to the energy status of my country's rich coal, lean oil, and little gas, making full use of coal resources and developing coal-based oil additives or substitutes that are energy-saving, environmentally friendly, and advanced in technology is one of the key development directions of my country's coal chemical industry. With the rapid development of traditional coal chemical industry and market pull, my country's methanol production capacity continues to expand, and the form of excess capacity is severe. Using methanol as raw material to produce D...

Claims

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Application Information

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IPC IPC(8): B01J8/02B01D3/00C08G65/00
CPCB01J8/02B01D3/009C08G65/00Y02P20/10
Inventor 段星杨晋平毛进池付晋寿李阳施福富范辉刘烨孙欣欣张长胜种彩云
Owner SEDIN ENG
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