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Low-carbon efficient system and method for combination supply of coal and coke-oven gases to produce ethylene glycol

A technology of ethylene glycol and coke oven gas, which is applied in the direction of chemical instruments and methods, carbon monoxide or formate reaction preparation, organic compound preparation, etc., can solve the problems of environmental pollution and waste of resources, and reduce environmental pollution and Greenhouse gas emission and the effect of increasing commercial utilization value

Inactive Publication Date: 2018-05-18
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Not only pollute the environment, but also waste precious resources

Method used

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  • Low-carbon efficient system and method for combination supply of coal and coke-oven gases to produce ethylene glycol
  • Low-carbon efficient system and method for combination supply of coal and coke-oven gases to produce ethylene glycol
  • Low-carbon efficient system and method for combination supply of coal and coke-oven gases to produce ethylene glycol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A low-carbon and high-efficiency coal and coke oven gas combined supply system for producing ethylene glycol of the present invention such as figure 2 As shown, it mainly includes: air separation unit 1, coal gasification unit 2, acid gas removal unit 4, hydrogen / carbon monoxide separation unit 5, ethylene glycol synthesis unit 6, ethylene glycol refining unit 7, dimethyl oxalate synthesis unit 8. Methane dry reforming unit 26 , methane steam reforming unit 27 and coke oven gas purification unit 28 .

[0044] Wherein: the air separation unit 1 is provided with an air inlet, a nitrogen outlet and an oxygen outlet; the coal gasification unit 2 is provided with a raw coal inlet, an oxygen inlet and a gasification synthesis gas outlet; the acid gas removal unit 4 is provided with a gasification synthesis gas inlet, Nitrogen gas inlet, carbon dioxide outlet and purified synthesis gas outlet; hydrogen / carbon monoxide separation unit 5 is provided with purified synthesis gas ...

Embodiment 2

[0063] This embodiment utilizes the system and method in embodiment 1 to carry out ethylene glycol production, wherein:

[0064] The flow rate of raw coal entering the system is 100t / h, and the feed flow rate of coke oven gas is 68t / h; the ratio of the amount of hydrogen to carbon monoxide separated by the hydrogen / carbon monoxide separation unit is 1.86:1; in the ethylene glycol synthesis unit , the feed molar ratio of hydrogen to dimethyl oxalate is 45.8; the temperature of the methane dry reforming unit is 850°C, the feed molar ratio of carbon dioxide and methane is 1:1; the temperature of the methane steam reforming unit is 900°C, and the steam The feed molar ratio to methane is 3.5.

[0065] The industrial analysis and elemental analysis of raw coal are shown in Table 1, and the process flow chart is as follows figure 2 .

[0066] Table 1 Industrial analysis and elemental analysis of raw coal

[0067]

[0068] Note: M, FC, V and A in the table represent the content...

Embodiment 3

[0071] This embodiment utilizes the system and method in embodiment 1 to carry out ethylene glycol production, wherein:

[0072] The flow rate of raw coal entering the system is 150t / h, and the feed flow rate of coke oven gas is 165t / h; the ratio of the amount of hydrogen to carbon monoxide separated by the hydrogen / carbon monoxide separation unit is 2.0:1; in the ethylene glycol synthesis unit In the process, the feed molar ratio of hydrogen to dimethyl oxalate is 50:1; the temperature of the methane dry reforming unit is 900°C, the feed molar ratio of carbon dioxide and methane is 1.1:1.0; the temperature of the methane steam reforming unit is 850°C , the water vapor and methane feed molar ratio is 4.

[0073] The industrial analysis and elemental analysis of raw coal are shown in Table 2, and the process flow chart is as follows figure 2 .

[0074] Table 2 Industrial analysis and elemental analysis of raw coal

[0075]

[0076] Note: M, FC, V and A in the table represe...

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Abstract

The invention discloses a low-carbon efficient system and a method for combination supply of coal and coke-oven gases to produce ethylene glycol. The system comprises a space division unit, a coal gasification unit, an acid gas desorption unit, a hydrogen / carbon monoxide separation unit, an ethylene glycol synthesis unit, an ethylene glycol refining unit, a dimethyl oxalate synthesis unit, a methane dry reformation unit, a methane steam reformation unit and a coke-oven gas purification unit. According to the system and the method, carbon dioxide obtained through separation of the acid gas desorption unit is comprehensively utilized, a high-value synthesis gas is prepared, not only is greenhouse gas emission of the conventional coal-derived ethylene glycol process reduced, but also the carbon utilization efficiency, the energy efficiency and the economic benefits of the conventional coal-derived ethylene glycol process are improved; by adopting the system, methane dry-wet reformation techniques are integrated, an optimal hydrogen-carbon ratio of a synthesis gas is adjusted, the situation that a great deal of carbon monoxide is applied to water-gas conversion reactions is avoided, awater-gas conversion unit is avoided, the resource utilization rate of the process is remarkably increased, and the energy efficiency of the process is remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of energy and chemical industry, and in particular relates to a system and method for coal and coke oven gas joint production of ethylene glycol. Background technique [0002] As an important organic chemical raw material, ethylene glycol (EG) is widely used in the production of polyester, antifreeze, surfactant, lubricant, plasticizer, cosmetics and other products. With the rapid development of my country's polyester industry, the demand for ethylene glycol in the domestic market continues to grow. Although my country's ethylene glycol production capacity has grown at an average annual rate of about 10% in recent years, the current domestic ethylene glycol production is far from meeting the growing market demand, and the external dependence has been higher than 60%. Therefore, how to increase the production capacity of ethylene glycol to solve the contradiction between the supply and demand of domestic eth...

Claims

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Application Information

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IPC IPC(8): C07C29/152C07C29/149C07C31/20
CPCC07C29/149C07C29/152C07C31/202C07C67/36C07C69/36Y02P20/10
Inventor 杨庆春张大伟刘星
Owner HEFEI UNIV OF TECH
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