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Method for recovering methanol in coal-based synthetic gas-to-glycol process

A technology for the recovery of coal-based synthesis gas and methanol, which is applied in the preparation of hydroxyl compounds, chemical instruments and methods, and preparation of organic compounds, etc. The effect of reducing the consumption of methanol, reducing the amount of methanol circulation, and reducing the accumulation

Active Publication Date: 2016-01-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the accumulation of methyl formate is too high, on the one hand, it will decompose to produce formic acid, which will corrode the equipment and pipelines;

Method used

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  • Method for recovering methanol in coal-based synthetic gas-to-glycol process
  • Method for recovering methanol in coal-based synthetic gas-to-glycol process
  • Method for recovering methanol in coal-based synthetic gas-to-glycol process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The crude methanol stream 1 containing methyl nitrite, methyl formate and dimethyl carbonate first enters the subester recovery tower T-101, and the top of the tower recovers to obtain methyl nitrite 2, and the methyl nitrite returns to the coupling reactor (marked in the figure), the still liquid 3 of the ester recovery tower T-101 enters the light removal tower T-102, and the top of the light removal tower T-102 removes methyl formate 5, and the still liquid of the light removal tower T-102 7 contains a large amount of methanol and a small amount of dimethyl carbonate, the mixture of methanol and dimethyl carbonate enters the methanol and dimethyl carbonate separation unit X-101, separates methanol 9 for recycling, and dimethyl carbonate 8 is extracted as a product.

[0044] 5000kg / hour of crude methanol, the content of methyl nitrite is 0.5wt%, the content of methyl formate is 0.5wt%, the content of dimethyl carbonate is 5wt%, and the content of methanol is 94wt%.

...

Embodiment 2

[0053] Embodiment is the same as [Example 1]. only,

[0054] 10000kg / hour of crude methanol, the content of methyl nitrite is 8wt%, the content of methyl formate is 20wt%, the content of dimethyl carbonate is 20wt%, and the content of methanol is 52wt%.

[0055] The theoretical plate number of the ester recovery tower is 25, the operating pressure at the top of the tower is 0.7MPag, the operating temperature at the top of the tower is 30°C, and the operating temperature at the bottom of the tower is 118°C.

[0056] The theoretical plate number of the light removal tower is 45, the operating pressure at the top of the tower is 0.7MPag, the operating temperature at the top of the tower is 100°C, and the operating temperature at the bottom of the tower is 129°C.

[0057] Among them, the main logistics components are shown in Table 2.

[0058] Table 2

[0059] logistics

1

2

3

5

7

9

8

temperature, ℃

40

30

118

40

12...

Embodiment 3

[0063] Embodiment is the same as [Example 1]. only,

[0064] 10000kg / hour of crude methanol, the content of methyl nitrite is 2wt%, the content of methyl formate is 1wt%, the content of dimethyl carbonate is 20wt%, and the content of methanol is 77wt%.

[0065] The theoretical plate number of the ester recovery tower is 15, the operating pressure at the top of the tower is 0.5MPag, the operating temperature at the top of the tower is 43°C, and the operating temperature at the bottom of the tower is 118°C.

[0066] The theoretical plate number of the light removal tower is 15, the operating pressure at the top of the tower is 0.3MPag, the operating temperature at the top of the tower is 75°C, and the operating temperature at the bottom of the tower is 105°C.

[0067] Among them, the main logistics components are shown in Table 3.

[0068] table 3

[0069] logistics

1

2

3

5

7

9

8

temperature, ℃

40

43

118

40

105 ...

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Abstract

The invention relates to a method for recovering methanol in a coal-based synthetic gas-to-glycol process. The method comprises the following steps: a crude methanol flow containing methyl nitrite, methyl formate and dimethyl carbonate enters a nitrite recovery tower, methyl nitrite is recovered from the top of the recovery tower, methyl nitrite removed crude methanol enters a light component removal tower, methyl formate is removed from the top of the light component removal tower, methyl formate removed crude methanol contains a small amount of dimethyl carbonate, methanol and dimethyl carbonate are separated to obtain methanol for cycle use, and dimethyl carbonate is extracted as a product to be used in industrial production of glycol.

Description

technical field [0001] The invention relates to a method for recovering methanol in the process of producing ethylene glycol from coal-based synthesis gas. Background technique [0002] CO normal pressure gas-phase catalytic coupling to prepare dimethyl oxalate (DMO) reaction is mainly divided into two steps of coupling and oxidative esterification, the product of oxidative esterification methyl nitrite (MN) is the oxygen carrier of the coupling reaction and The intermediate, the NO in the tail gas of the coupling reaction is the reactant of the oxidative esterification reaction, so the matching of the coupling reaction and the oxidative esterification reaction is the key to realize the green and pollution-free circulation system. [0003] Coupling reaction equation: [0004] 2CH 3 ONO+2CO→(COOCH 3 ) 2 +2NO [0005] Oxygenated esterification reaction equation: [0006] [0007] The methyl nitrite generated by the oxidative esterification is returned to the coupling ...

Claims

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Application Information

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IPC IPC(8): C07C27/28C07C29/76C07C29/80C07C31/04C07C67/54C07C69/06C07C68/08C07C69/96C07C201/04C07C203/00
CPCY02E60/32C07C27/28C07C31/04C07C67/54C07C69/36
Inventor 杨卫胜贺来宾李木金胡松
Owner CHINA PETROLEUM & CHEM CORP
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