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Method and device for safely preparing dimethyl oxalate in coupling reactor and application thereof

A dimethyl oxalate and reactor technology, which is applied in the preparation of carbon monoxide or formate reaction, chemical instruments and methods, preparation of hydroxyl compounds, etc., can solve problems such as hidden dangers of methyl nitrite, and achieve safe industrial production, The effect of preventing explosion

Pending Publication Date: 2022-01-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem of potential safety hazards in methyl nitrite in the coupling section during the production of ethylene glycol by syngas in the prior art, and to provide a method for safely preparing methyl nitrite in a coupling reactor. Method and device for dimethyl oxalate and application thereof

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  • Method and device for safely preparing dimethyl oxalate in coupling reactor and application thereof

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Experimental program
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Effect test

Embodiment 1

[0073] The methyl nitrite coupling reaction conditions are: temperature 100° C., pressure 1.8 MPa. The volume ratio of the methyl nitrite and carbon monoxide is 1:15. The intake of fresh cooling water is (4.50v)m 3 / h, the cooling water circulation is (0.8v)m 3 / h, where v is the volume of the coupling reactor, and the temperature and / or pressure in the coupling reactor are controlled in the following manner.

[0074] When the temperature in the coupling reactor exceeds 189°C, increase the circulation of cooling water to 1.9 times of the original circulation. At the same time, when the intake of fresh cooling water is lower than 90% of the original flow, a low cooling water flow alarm is generated, and the intake of fresh cooling water is increased to 115% of the original intake. Simultaneously when fresh cooling water feed rate is lower than 80% of original flow, cut off the feeding of raw material methyl nitrite urgently.

[0075] When the temperature in the coupling rea...

Embodiment 2

[0083] The methyl nitrite coupling reaction conditions are: temperature 155°C, pressure 1.2MPa. The volume ratio of the methyl nitrite and carbon monoxide is 1:15. The intake of fresh cooling water is (4.50v)m 3 / h, cooling water circulation is (0.8v)m 3 / h, where v is the volume of the coupling reactor, and the temperature and / or pressure in the coupling reactor are controlled in the following manner.

[0084] When the temperature in the coupling reactor exceeds 185°C, increase the cooling water circulation to 1.4 times the original circulation. At the same time, when the fresh cooling water flow rate is lower than 90% of the original flow rate, a low cooling water flow alarm will be generated, and the fresh cooling water flow rate will be increased to 115% of the original flow rate; the fresh cooling water flow rate will be lower than the original flow rate. When 80%, cut off the feeding of raw material methyl nitrite urgently.

[0085] When the temperature in the coupli...

Embodiment 3

[0093] The methyl nitrite coupling reaction conditions are: temperature 185°C, pressure 2.5MPa. The volume ratio of the methyl nitrite and carbon monoxide is 1:12. The intake of fresh cooling water is (6.50v)m 3 / h, cooling water circulation is (1.3v)m 3 / h, where v is the volume of the coupling reactor, and the temperature and / or pressure in the coupling reactor are controlled in the following manner.

[0094] When the temperature in the coupling reactor exceeds 205°C, increase the cooling water circulation to 2.2 times the original circulation. At the same time, when the intake of fresh cooling water is lower than 90% of the original flow, a low cooling water flow alarm will be generated, and the intake of fresh cooling water will be increased to 125% of the original intake; the intake of fresh cooling water will be lower than the original flow When 80%, cut off the feeding of raw material methyl nitrite urgently.

[0095] When the temperature in the coupling reactor exc...

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Abstract

The invention relates to the field of ethylene glycol synthesis, and discloses a method for safely preparing dimethyl oxalate in a coupling reactor, which comprises the following steps: introducing methyl nitrite and carbon monoxide into a methyl nitrite coupling reactor, carrying out a coupling reaction at a set temperature T and a set pressure P, and introducing fresh cooling water and circulating the cooling water in the reactor during the reaction. The method is characterized in that the method comprises measuring the temperature and / or pressure in the coupling reactor regularly or irregularly, and controlling the temperature and / or pressure in the coupling reactor by adopting a hierarchical control mode according to the measurement result, so that the temperature in the coupling reactor is maintained at T and / or the pressure is maintained at P. By adopting the method and the coupling reactor provided by the invention, the reaction of coupling the methyl nitrite with the carbon monoxide to generate the dimethyl oxalate can be safely carried out, and the production safety of a coupling section for preparing the ethylene glycol from the industrial synthesis gas is ensured.

Description

technical field [0001] The invention relates to the field of ethylene glycol preparation, in particular to a method and device for safely preparing dimethyl oxalate in a coupling reactor and an application thereof. Background technique [0002] Ethylene glycol (EG) is an important petrochemical basic organic raw material with a wide range of uses. According to statistics, in 2016, the global production capacity of ethylene glycol was about 37.47 million tons, and the consumption was 26.145 million tons. At present, the large-scale industrial production of ethylene glycol at home and abroad mainly adopts the process route of direct hydration of ethylene oxide, but this production technology is basically monopolized by Shell of the Netherlands, Halcon-SD of the United States and UCC of the United States. Moreover, this production process is also restricted by oil prices, and its economic benefits are unstable. [0003] At present, a new technology for the preparation of ethy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/36C07C69/36C07C29/149C07C31/20
CPCC07C67/36C07C29/149C07C69/36C07C31/202
Inventor 文松赵磊姜杰徐伟
Owner CHINA PETROLEUM & CHEM CORP
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