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Method and device for safely preparing methyl nitrite in oxidative esterification reactor and application thereof

A technology of methyl nitrite and oxidative esterification, applied in the directions of carbon monoxide or formate reaction preparation, nitrite preparation, chemical instruments and methods, etc., can solve problems such as lack of safety guarantee for dangerous characteristics, and achieve safe industrial production. , Safe use guarantee, the effect of preventing explosion

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

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for safely preparing methyl nitrite in an oxidative esterification reactor in order to overcome the problem in the prior art that the dangerous characteristics of the oxidative esterification reactor in the process of preparing ethylene glycol from syngas lack safety assurance. The method adopts the layered control mode to control the temperature and / or pressure in the oxidation esterification reactor, and has the characteristics of ensuring production efficiency under the premise of ensuring production safety

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  • Method and device for safely preparing methyl nitrite in oxidative esterification reactor and application thereof

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Experimental program
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Effect test

Embodiment 1

[0070] The reaction conditions of oxidative esterification are temperature 20°C, pressure 0.1 MPa, molar ratio of methanol, nitric oxide and oxygen is 100:10:5, cold methanol reflux is 105±15% of the original flow. At the same time, the temperature and / or pressure in the oxidative esterification reactor are controlled in the following manner.

[0071] When the temperature in the oxidative esterification reactor reached 48°C, increase the reflux of cold methanol to 1.9 times of the original reflux. At the same time, when the methanol flow rate is lower than 80% of the original flow rate, a methanol low flow alarm is generated, and the methanol flow rate is increased to 100% of the original flow rate. When the flow of methanol is lower than 70% of the original flow, the feed of raw oxygen is cut off urgently.

[0072] When the temperature in the oxidative esterification reactor reaches 60° C., the reflux of cold methanol is increased to 2.9 times of the original reflux. And on...

Embodiment 2

[0080] The reaction conditions of oxidative esterification are temperature 35°C, pressure 0.2MPa, molar ratio of methanol, nitrogen monoxide and oxygen is 150:20:7, and the reflux of cold methanol is more than 90% of the original reflux. At the same time, the temperature and / or pressure in the oxidative esterification reactor are controlled in the following manner.

[0081] When the temperature in the oxidative esterification reactor reached 55°C, increase the reflux of cold methanol to 2.5 times of the original reflux. At the same time, when the methanol flow rate is lower than 80% of the original flow rate, a methanol low flow alarm is generated, and the methanol flow rate is increased to 120% of the original flow rate. When the flow of methanol is lower than 70% of the original flow, the feed of raw oxygen is cut off urgently.

[0082] When the temperature in the oxidative esterification reactor reaches 65° C., increase the reflux of cold methanol to 3.6 times of the origi...

Embodiment 3

[0090] The reaction conditions of oxidative esterification are temperature 45°C, pressure 0.24MPa, the molar ratio of methanol, nitrogen monoxide and oxygen is 130:18:6, and the reflux flow of cold methanol is more than 90% of the original flow. At the same time, the temperature and / or pressure in the oxidative esterification reactor are controlled in the following manner.

[0091] When the temperature in the oxidative esterification reactor reached 45°C, the reflux of cold methanol was increased to 1.6 times of the original reflux. At the same time, when the methanol flow rate is lower than 80% of the original flow rate, a methanol low flow alarm is generated, and the methanol flow rate is increased to 130% of the original flow rate. When the flow of methanol is lower than 70% of the original flow, the feed of raw oxygen is cut off urgently.

[0092] When the temperature in the oxidative esterification reactor reaches 55° C., increase the reflux of cold methanol to 2.2 times...

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Abstract

The invention relates to the field of ethylene glycol synthesis, and discloses a method for safely preparing methyl nitrite in an oxidative esterification reactor, which comprises the following steps: introducing fresh methanol, nitric oxide and oxygen into the oxidative esterification reactor, carrying out oxidative esterification reaction at a set temperature T and a set pressure P, recycling cold methanol from the unreacted gas phase, and returning the recycled cold methanol to the oxidative esterification reactor to participate the oxidative esterification reaction. The method comprises measuring the temperature and / or pressure in the oxidative esterification reactor regularly or irregularly, and controlling the temperature and / or pressure in the oxidative esterification reactor in a hierarchical control mode, thus maintaining the temperature and the pressure in a safe range. The method and the oxidative esterification reactor provided by the invention can effectively prevent burning explosion in the preparation process of the methyl nitrite, so that the use of the methyl nitrite in a coupling section is ensured, and the safe industrial production of preparing the ethylene glycol from the synthesis gas is realized.

Description

technical field [0001] The invention relates to the field of ethylene glycol preparation, in particular to a method and device for safely preparing methyl nitrite in an oxidative esterification reactor and an application thereof. Background technique [0002] Ethylene glycol (EG) is an important basic organic raw material in petrochemical industry with a wide range of uses. In 2016, the global ethylene glycol production capacity was about 37.47 million tons, and the consumption was 26.145 million tons, of which 85% ethylene glycol was used in the polyester industry. 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, that is, first synthesizes ethylene through the petroleum route, then oxidizes ethylene to produce ethylene oxide, and finally hydrates ethylene oxide non-catalytically. The reaction gives EG. The production technology is basically monopolized by Shell of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C201/04C07C203/00C07C67/36C07C69/36C07C29/149C07C31/20
CPCC07C201/04C07C67/36C07C29/149C07C203/00C07C69/36C07C31/202
Inventor 文松姜杰赵磊徐伟
Owner CHINA PETROLEUM & CHEM CORP
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