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Vaporization method and vaporization device of dimethyl oxalate

A technology of dimethyl oxalate and vaporization tower, which is applied in chemical instruments and methods, boiling devices, feeding devices, etc., can solve the problems of short operation period of hydrogenation reaction system, increase of resistance of vaporization tower and catalyst bed, etc., and achieve Guarantee long-term stable operation, extend the operation cycle, and reduce the effect of impurity content

Active Publication Date: 2021-06-25
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this process, the entrainment of mist in the vaporization tower is very serious, and the DMO raw material is easily carried by hydrogen to the upper packing of the vaporization tower, and even further out of the vaporization tower and into the catalyst bed of the catalytic hydrogenation reactor, while the impurities in DMO It is easy to coke at the operating temperature and block the packing in the vaporization tower and the catalyst bed in the catalytic hydrogenation reactor, resulting in an increase in the resistance of the vaporization tower and the catalyst bed, resulting in a short operating cycle of the hydrogenation reaction system

Method used

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  • Vaporization method and vaporization device of dimethyl oxalate
  • Vaporization method and vaporization device of dimethyl oxalate
  • Vaporization method and vaporization device of dimethyl oxalate

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Embodiment 1

[0049] The vaporization method of embodiment 1 dimethyl oxalate

[0050] The technological process of this embodiment is as figure 1 As shown, the specific process flow is described as follows:

[0051] The DMO fresh feed S101 and the DMO circulating material S109 from the bottom of the vaporization tower T101 respectively enter the DMO circulating storage tank V101 for mixing, and the circulating ratio is 18.8. The DMO feed S106 flowing out of the DMO circulation storage tank V101 is sent to the preheater H101 to be preheated to 160°C, and the preheated DMO feed S107 then enters the middle of the two-layer packing of the vaporization tower T101 in liquid phase, and passes through Liquid distributor for spraying.

[0052] The total hydrogen feed S102 is preheated to 180°C by the preheater H102 to obtain the preheated total hydrogen feed S103, and the hydrogen ester ratio is controlled to be 50. According to the heat required to vaporize the DMO feed S107, the total hydrogen...

Embodiment 2

[0055] The vaporization method of embodiment 2 dimethyl oxalate

[0056] The flow chart is the same as in Embodiment 1, the difference is:

[0057] The cycle ratio of DMO fresh feed and DMO cycle material is controlled to be 12.9.

[0058] The DMO feed S106 is sent to the preheater H101 to be preheated to 180°C.

[0059] The total hydrogen feed S102 is preheated to 200°C through the preheater H102.

[0060] The volume flow of the second hydrogen feed S105 is controlled to be 34% of the volume flow of the total hydrogen feed S102.

[0061] Control the operating gas-liquid ratio in the vaporization tower T101 to be 14.

[0062] The theoretical plate number corresponding to the packing height required to control the vaporization tower is 1, and the operating pressure of the vaporization tower is 3Mpa.

Embodiment 3

[0063] The vaporization method of embodiment 3 dimethyl oxalate

[0064] The flow chart is the same as in Embodiment 1, the difference is:

[0065] The cycle ratio of DMO fresh feed and DMO cycle material is controlled to be 10.9.

[0066] The DMO feed S106 is sent to the preheater H101 to be preheated to 190°C.

[0067] The total hydrogen feed S102 is preheated to 210°C through the preheater H102.

[0068] The volume flow of the second hydrogen feed S105 is controlled to be 26% of the volume flow of the total hydrogen feed S102.

[0069] Control the operating gas-liquid ratio in the vaporization tower T101 to be 13.

[0070] The theoretical plate number corresponding to the packing height required for controlling the vaporization tower is 1, and the operating pressure of the vaporization tower is 5Mpa.

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Abstract

The invention discloses a method for vaporizing dimethyl oxalate, which comprises the following steps: (1), DMO fresh feed and DMO circulating material are mixed to form DMO feed, and the DMO feed is preheated and enters a vaporization tower for vaporization ; 2), the total hydrogen feed is divided into two stocks of materials, the first hydrogen feed does not enter the vaporization tower, the second hydrogen feed enters from the bottom of the vaporization tower, and the vaporized DMO from the vaporization tower The upper part of the vaporization tower is taken out, and then mixed with the first hydrogen feed; the vaporization method of dimethyl oxalate of the present invention significantly reduces the impurity content in the mixed gas discharge from the vaporization tower, so that the packing layer and The operation period of the catalyst is significantly extended, which greatly improves the production efficiency and reduces the production cost. The invention also discloses a vaporization device of dimethyl oxalate based on the vaporization method of dimethyl oxalate.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, in particular to the vaporization process of dimethyl oxalate in the process of preparing ethylene glycol from coal-based synthesis gas, and in particular to the vaporization method and vaporization device of dimethyl oxalate. Background technique [0002] Ethylene glycol (EG) is an important chemical raw material, mainly used in the production of polyester fibers, polyester plastics, antifreeze, lubricants, plasticizers, explosives and chemical intermediates. The process routes for synthesizing EG mainly include petroleum route, coal-to-EG route and biomass-to-EG route. At present, the petroleum route is still dominant, that is, ethylene oxide hydration method. With the increasing shortage of petroleum resources, the development of C1 chemical industry based on natural gas and coal-based raw materials has important practical significance for our country, and related technologies have a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J4/00B01B1/00
CPCB01B1/00B01J4/001
Inventor 沈荣春李伟周静红
Owner EAST CHINA UNIV OF SCI & TECH
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