Method for purifying and recycling benzoid hydrocarbon, ammonia and coal tar from coke-oven gas

A technology for coke oven gas and benzene hydrocarbons, applied in chemical instruments and methods, combustible gas purification, combustible gas purification/transformation, etc., can solve the problems of disordered process temperature changes, complex process flow, frequent gradient changes, etc. The effect of smooth gradient change, simplified process flow, and orderly temperature change

Inactive Publication Date: 2010-06-09
WUHAN UNIV OF SCI & TECH
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  • Abstract
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Problems solved by technology

[0004] The above processes have disordered temperature changes, frequent gradient changes, complex process flow, high energy consumption, many pollution sources, and high production costs

Method used

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  • Method for purifying and recycling benzoid hydrocarbon, ammonia and coal tar from coke-oven gas
  • Method for purifying and recycling benzoid hydrocarbon, ammonia and coal tar from coke-oven gas
  • Method for purifying and recycling benzoid hydrocarbon, ammonia and coal tar from coke-oven gas

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Embodiment

[0030] A method for purifying coke oven gas and recovering benzene group hydrocarbons, ammonia and coal tar. Its process is as figure 1Shown: Coke oven gas at 80-90°C is cooled to 20-27°C through the condensation process and then directly enters the benzene washing process. The final 30~35℃ coke oven gas enters the desulfurization process for desulfurization, and the desulfurized 30~35℃ coke oven gas enters the blast pressurization process for pressurization, and the coke oven gas is naturally heated to 50~55℃. The gas enters the ammonium sulfate process to recover ammonia, and the net coke oven gas after the ammonium sulfate process is used as high-quality fuel for external supply.

[0031] The remaining ammonia water produced in the condensation process enters the ammonia desorption process to desorb the ammonia, and enters the ammonium sulfate process to produce ammonium sulfate; the rich oil produced in the benzene washing process passes through the crude benzene distilla...

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Abstract

The invention relates to a method for purifying and recycling benzoid hydrocarbon, ammonia and coal tar from coke-oven gas. The technical scheme of the method comprises the following steps of: cooling the 80-90 DEG C coke-oven gas through a condensation step to 20-27 DEG C, then directly carrying out a benzene washing step, absorbing benzoid hydrocarbon in the coke-oven gas to the wash oil to form rich oil, desulfurizing the coke-oven gas at 30-35 DEG C after the benzene washing step, air-blast pressurizing the desulfurized coke-oven gas at 30-35 DEG C, naturally raising the temperature of the coke-oven gas to 50-55 DEG C, carrying out an ammonium sulfate step on the coke-oven gas to recycle ammonia therein, and using the purified coke-oven gas after the ammonium sulfate step as high-grade fuel to be supplied to the outside. The remaining ammonia water generated in the condensation step goes into an ammonia desorption step so as to desorb ammonia and goes into the ammonium sulfate step to produce ammonium sulfate; and benzoid hydrocarbon is recycled from the rich oil produced in the benzene washing step through a crude benzene distilling step. The invention has the characteristics of orderly temperature change, smooth change of gradient, simple technical process, low energy consumption, low production cost, high purification efficiency and environmental friendliness.

Description

technical field [0001] The invention belongs to the technical field of coke oven gas purification and chemical product recovery. Specifically, it relates to a method for purifying coke oven gas and recovering benzene group hydrocarbons, ammonia and coal tar. Background technique [0002] At present, for the purification of coke oven gas and the recovery of chemical products, the coke oven gas is condensed and cooled, absorbed by various absorbents, steam distillation treatment and other methods are usually used at home and abroad to recover chemical products such as benzene group hydrocarbons, ammonia and coal tar in the gas ( Selection of coke oven gas purification process, Yang Jianhua and Wang Yonglin, "Anhui Metallurgy" 2008 No. 2), the process flow is: condensation process, blast pressurization process, pre-cooling process, desulfurization process, ammonia distillation process, ammonium sulfate process, Final cooling process, benzene washing process, crude benzene dist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10K1/00C10K1/04C10K1/16C01C1/242C10G5/00
Inventor 王光华温燕明魏松波王晴东梁玉河何选明欧阳曙光李文兵常红兵
Owner WUHAN UNIV OF SCI & TECH
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