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Treatment method and treatment system for mixed material flow containing dimethyl oxalate and application

A technology of dimethyl oxalate and a treatment method, which is applied in the field of treatment of dimethyl oxalate, can solve problems such as treatment difficulty, catalyst loss, metal corrosion, etc., and achieve the effects of avoiding material waste and improving stability

Active Publication Date: 2021-05-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] After the dimethyl oxalate generated by the coupling reaction is absorbed by alcohol, usually after dealcoholization and dimethyl carbonate, the crude dimethyl oxalate is extracted from the tower kettle, such as the prior art CN203960094U, CN106518675A, but the tower kettle extracts The dimethyl oxalate produced usually contains trace metal and catalyst element impurities, mainly from the slow loss of catalyst and metal corrosion. In addition, since the coupling-esterification system is a nitrogen oxide circulation system, it is inevitable to generate high-boiling point impurities. Nitrogen compound, dimethyl oxalate (when R is methyl) that finally enters the tower tank
Although these impurities are low in content, they will affect the stability of the hydrogenation system after entering the hydrogenation reaction system
Separation must be carried out, but a certain amount of dimethyl oxalate containing heavy components usually needs to be discharged during the separation process, which is difficult to handle

Method used

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  • Treatment method and treatment system for mixed material flow containing dimethyl oxalate and application
  • Treatment method and treatment system for mixed material flow containing dimethyl oxalate and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] The system of this embodiment is a supporting device for an annual production of 200,000 tons of ethylene glycol.

[0075] The dimethyl oxalate-containing stream to be treated is 52 t / h, and the weight composition is (the composition does not include traces of nitrogen-containing compounds and heavy metals): 99.9% of dimethyl oxalate and 0.1% of dimethyl carbonate. The content of N-containing compounds is 100 ppm (calculated as nitrogen element), and the content of heavy metals is 2 ppm.

[0076] Dimethyl oxalate rectification tower adopts floating valve tower with 10 theoretical plates, the feed position is the fourth theoretical plate, the dimethyl oxalate product extraction position is the fifth theoretical plate, and the liquid phase is extracted.

[0077] The operating pressure of the dimethyl oxalate rectifying tower is 0.05MPaG, and the operating temperature at the top of the tower is 173°C.

[0078] The flow rate of the dimethyl oxalate produced from the side l...

Embodiment 2

[0083] The system of this embodiment is a supporting device for an annual production of 200,000 tons of ethylene glycol.

[0084] The dimethyl oxalate-containing stream to be treated is 52 t / h, and the weight composition is (the composition does not include traces of nitrogen-containing compounds and heavy metals): 99.9% of dimethyl oxalate and 0.1% of dimethyl carbonate. The content of N-containing compounds is 100 ppm (calculated as nitrogen element), and the content of heavy metals is 2 ppm.

[0085] Dimethyl oxalate rectification tower adopts floating valve tower with 10 theoretical plates, the feed position is the fourth theoretical plate, the dimethyl oxalate product extraction position is the fifth theoretical plate, and the liquid phase is extracted.

[0086] The operating pressure of the dimethyl oxalate rectifying tower is 0.05MPaG, and the operating temperature at the top of the tower is 173°C.

[0087] The flow rate of the dimethyl oxalate produced from the side l...

Embodiment 3-7

[0092] To process the dimethyl oxalate stream in Example 1, dimethyl oxalate rectification towers with different parameters, different extraction ratios from the bottom of the tower, and different decarbonylation reaction parameters were used, as shown in Table 1 below.

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Abstract

The invention provides a treatment method and a treatment system for a mixed material flow containing dimethyl oxalate and application, and mainly solves the problems that in the prior art, the amount of extracted heavy-component-containing dimethyl oxalate is large and treatment is difficult, the treatment method comprises the steps of: subjecting the mixed material flow to dimethyl oxalate rectification, extracting a dimethyl oxalate product from a side line liquid phase, sending a heavy-component-containing dimethyl oxalate material flow extracted from the tower kettle into a decarbonylation reaction system, thus obtaining a material flow containing dimethyl carbonate, CO, a byproduct CO2 and a byproduct dimethyl ether in the decarbonylation reaction system; wherein when dimethyl oxalate rectification is carried out, the generated CO is circulated back to a coupling unit for further recovery, so that the problem is well solved, and the method can be used for treating dimethyl oxalate in the process of preparing ethylene glycol from synthesis gas.

Description

technical field [0001] The present invention relates to the treatment of dimethyl oxalate, in particular to a treatment method, treatment system and application of a mixture flow containing dimethyl oxalate, especially for the treatment of dimethyl oxalate separated in the process of producing ethylene glycol from syngas deal with. Background technique [0002] Dimethyl oxalate is an important organic chemical raw material, which can be used to produce various dyes, solvents, extractants and various intermediates, and is widely used in fine chemicals. In addition, ethylene glycol can be prepared from dimethyl oxalate through hydrogenation reaction, which is a new large-scale industrialized ethylene glycol synthesis process route. For a long time, ethylene glycol has been mainly prepared by petroleum route, which has a high cost. [0003] The traditional synthesis process of dimethyl oxalate is obtained by heating oxalic acid and alcohols in toluene solvent for esterificati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C68/00C07C69/96C07C67/54C07C69/36B01D3/14C01B32/40
CPCC07C68/00C07C67/54B01D3/14C01B32/40C07C68/08C07C69/96C07C69/36
Inventor 杨卫胜施德贺来宾
Owner CHINA PETROLEUM & CHEM CORP