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A method for removing benzene group hydrocarbons in coke oven gas

A technology for coke oven gas and benzene hydrocarbons, which is applied in the fields of combustible gas purification, climate sustainability, combustible gas purification/reconstruction, etc. It can solve the problems of low solubility and absorption rate, only applicable, and high cost of cooling equipment heat exchangers , to achieve the effect of economical saving and reducing volatilization loss

Inactive Publication Date: 2016-02-03
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the disadvantage of using this kind of washing oil is: the absorption of aromatics by washing oil is purely physical absorption, and the solubility and absorption rate are low; if this kind of hydrocarbon washing oil contains water, it is easy to form emulsion at low temperature, which will affect the process operation ;Because the washing oil cannot fully dissolve the moisture in the coke oven gas, the absorption process can not dehydrate the coke oven gas at the same time, so additional dehydration operation equipment is required; the washing oil also needs to be deeply regenerated after repeated use
[0006] Low-temperature treatment technology is also a common technology for coke oven gas purification treatment, but this technology uses a low-temperature cold source, which requires high energy grades, and the cost of cooling equipment, especially heat exchangers, is also high, and its actual treatment accuracy It has a lot to do with the level of operation and is generally only suitable for preliminary purification

Method used

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  • A method for removing benzene group hydrocarbons in coke oven gas
  • A method for removing benzene group hydrocarbons in coke oven gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The coke oven gas in a factory still contains aromatic components after desulfurization, deammonification and other processes. According to the needs of the follow-up section, the aromatics should be removed to 3 , the main volume percentage components and impurity content of the feed gas are as follows:

[0028] CO 2 : 2%, CO: 8%, H 2 : 65%, CH 4 : 25%, water content 31g / Nm 3 , aromatics and others: 35g / m 3 . The main components of impurities such as aromatic hydrocarbons are as follows:

[0029] Table 1 Composition of impurities such as aromatics in raw gas

[0030] components

Content g / m 3

Content ratiowt%

Remark

benzene

24.395

69.7

toluene

5.915

16.9

Xylene

1.575

4.5

Contains isomers

trimethylbenzene

0.735

2.1

Contains isomers

unsaturated aliphatic hydrocarbon

0.42

1.2

Cyclopentadiene

0.21

0.6

Styrene

0.1...

Embodiment 2

[0043] The treatment gas source is the same as in Example 1, and the absorption solvent is a mixed solvent of 80wt% N-formylmorpholine + 20wt% N-acetylmorpholine, which also contains simethicone oil with a mass of 5ppm, and the gas to be treated enters the absorption tower The temperature is 30°C, and the pressure at the top of the tower is 0.15MPa, a. The content of aromatics in the liquid entering the absorption tower is less than 0.5%, without water.

[0044] After purification, the content of aromatics in the purified gas from the absorption tower is reduced to 5mg / m 3 Hereinafter, its main composition is the same as that of Example 1.

[0045] The operating temperature of the recovery column is about 202° C., the temperature at the top of the tower is 80° C., the pressure at the top of the tower is 0.04 MPa, and the reflux ratio is 2. Other conditions and results are the same as in Example 1.

[0046] The operating temperature of the regenerating tower kettle was 177° C...

Embodiment 3

[0048] The gas source is the same as in Example 1, and the absorption solvent is N-formylmorpholine and N-acetylmorpholine. Prepare a mixed solvent with a mass ratio of 1:1, and the mixed solvent also contains simethicone with a mass of 5ppm . The temperature of the gas to be treated entering the absorption tower is 30°C, and the pressure at the top of the tower is 0.12MPa, a. The content of aromatics in the liquid entering the absorption tower is less than 0.5%, and does not contain water. The working condition liquid-gas volume ratio is 1:530-580, and the rest of the conditions are the same as in Example 1.

[0049] The benzene content in the purified gas exiting the absorption tower after purification is 1.9mg / m 3 , toluene, xylene less than 0.2mg / m 3 , other aromatic components totaled 6.34g / m 3 .

[0050] The operating temperature of the recovery column is about 205° C., the temperature at the top of the tower is 80° C., the pressure at the top of the tower is 0.11 MP...

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Abstract

The invention belongs to the field of chemical industry, and particularly relates to a removal method of benzenoid hydrocarbon in coke oven gas. The method is characterized by processing the benzenoid hydrocarbon in coke oven gas in an adsorption purification manner by utilizing an adsorption agent. The method specifically comprises the steps: adopting an aromatic hydrocarbon trapping and purifying method, recycling solvent and regenerating, wherein the adsorption agent is mixed solution of N-formyl morpholine and N-morpholinoethanone; the adsorption agent also comprises one or more of sulfolane, water and morpholine, which are used as main components and one or more of simethicone, silicone oleic acid stearic acid, octyl phenol polyethenoxy ether and silicon dioxide, which are used as auxiliary components. Through the method, the aromatic hydrocarbon in the coke oven gas can be rapidly and efficiently removed to be less than 2mg / Nm<3>. The heat of each step is recycled, so that economical efficiency, energy conservation and environmental protection can be realized.

Description

technical field [0001] The invention belongs to the field of chemical industry, in particular to a method for removing benzene group hydrocarbons in coke oven gas. Background technique [0002] A large amount of coke oven gas is produced during coke production. Coke oven gas contains a large amount of aromatic components (mainly including benzene, naphthalene, toluene, xylene, etc.), coking plants can recover these aromatics for the production of crude benzene, naphthalene and other substances. In addition, with the improvement of environmental protection requirements and the promotion of chemical utilization after coke oven gas purification in recent years, the demand for purification of aromatics in coke oven gas is also more urgent. For example, the benzene recovery process of ordinary coke oven gas generally requires the removal of aromatics in coke oven gas to 2g / Nm 3 Below; before the conversion section of coke oven gas to synthesis gas process, it is required to rem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10K1/16
CPCY02P20/10
Inventor 朱林姚雄生金鑫任莉王大军
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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