Process employing coke-oven gas for production of methane

A technology for coke oven gas and methane, which is applied in the direction of adsorption purification/separation, membrane purification/separation, and hydrocarbon production from carbon oxides, etc. It can solve the problems of incomplete hydrogen reaction, low methane yield, and slow reaction rate. Achieve the effects of shortening the cycle period, increasing the yield of methane, and increasing the reaction rate

Inactive Publication Date: 2009-12-23
TAIYUAN UNIV OF TECH
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Problems solved by technology

The process first separates methane from the purified coke oven gas to solve the problems of slow methanation reaction rate and low methane yield; secondly, it supplements carbon dioxide-containing gas during the methanation reaction process to maximize hydrogen production. Participate in the reaction to solve the problem of incomplete hydrogen reaction in the reactant; fin

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  • Process employing coke-oven gas for production of methane
  • Process employing coke-oven gas for production of methane
  • Process employing coke-oven gas for production of methane

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Embodiment 1

[0027] The coke oven gas of the present invention is derived from low-temperature dry distillation, medium-temperature dry distillation or high-temperature dry distillation of coal, and is preliminarily purified coke oven gas, mainly containing methane, hydrogen, carbon monoxide, carbon dioxide and other gases.

[0028] Such as figure 1 Among them, the coke oven gas produced by low-temperature carbonization of coal is subjected to purification processes of dust removal, naphthalene, ammonia, benzene group hydrocarbons, desulfurization, and detarring, and then pressurized to 4.4MPa at a temperature of 40°C and enters the pressure swing adsorption device. Pressure swing adsorption is carried out at a pressure of 2.0-4.4MPa and a temperature of 25-40°C to obtain low-carbon hydrocarbons, carbon monoxide, carbon dioxide and hydrogen. The low-carbon hydrocarbons are compressed to obtain gaseous methane products. Carbon monoxide, carbon dioxide and hydrogen enter the methanation unit...

Embodiment 2

[0030]The coke oven gas produced by medium-temperature dry distillation of coal is subjected to purification processes of dust removal, naphthalene, ammonia, benzene group, desulfurization, and detarring, and then pressurized to 5.0 MPa at 0-15°C and enters the condensing device. Condensation is carried out at a pressure of 3.5-5.0 MPa and a temperature of -170-15°C to obtain a liquid mixture of methane and carbon dioxide and a gaseous mixture of carbon monoxide and hydrogen. After the liquid mixture is processed, the liquid methane product is obtained. After the liquid carbon dioxide is gasified and the gaseous mixture enters the methanation reaction device for reaction, the gas containing 55-60% carbon dioxide is replenished to the methanation device. 28-30%. After the reaction is completed, the methane mixed gas returns to the pressurizing device, pressurizes together with the purified coke oven gas to 5.0MPa at 0-15°C, and then condenses at a pressure of 3.5-5.0MPa and a t...

Embodiment 3

[0032] The coke oven gas produced by medium-temperature dry distillation of coal is desulfurized, detarred, and impurity-removed and purified, then pressurized to 5.0MPa at 20°C and enters the membrane separation device. Membrane separation is carried out at a pressure of 4.0-5.0 MPa and a temperature of 15-25°C to separate mixed gas 1 and mixed gas 2. Mixed gas 1 is mainly composed of hydrogen, carbon monoxide, and carbon dioxide, and contains a small amount of methane. Mixed gas 2 is Mainly methane, also contains a small amount of hydrogen, carbon monoxide, carbon dioxide. The gaseous methane product is obtained after the mixed gas 2 is processed, and the mixed gas 1 enters the methanation device for reaction, and the gas containing 80-85% carbon dioxide is supplemented to the methanation device, and the replenishment amount is 40-45% of the total gas entering the methanation device. After the reaction is completed, the methane mixed gas returns to the pressurizing device, p...

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Abstract

A process employing coke-oven gas for production of methane comprises the following steps: separating methane from the purified coke-oven gas to obtaining methane, performing methanation by using the mixture obtained by separation and a gas containing carbon dioxide, sending the obtained methane mixed gas back after the reaction for separating methane and recycling the above steps to prepare methane. The invention reasonablely combines the physical separation method and chemical synthesis method together, thus improving the methanation rate and the methane yield, reducing the volume of a reactor and the consumption of catalyst, realizing zero emission and zero pollution, and effectively adopting greenhouse gas carbon dioxide. The process has reasonable process route, thus being applicable to the production of methane by using the coke-oven gas generated from the dry distillation of coal.

Description

technical field [0001] A process for producing methane from coke oven gas, including purification treatment of coke oven gas, separation after pressurization to obtain methane and mixed products, a process for producing methane from coke oven gas. technical background [0002] A large amount of coke oven gas is produced in the coke production process, and its general composition is: H 2 : 40~70%, CH 4 : 10.0~30.0%, CO: 5~15%, N 2 : 2~10%, CO 2 : 1~5%, C n h m : 2~4%, O 2 : 0.1-1.5% and a small amount of impurities. Its main purpose is to generate electricity, produce methanol, ammonia, urea, hydrogen, gas for production and domestic use, and some coke oven gas is directly burned and discharged, which has a low utilization rate and pollutes the atmosphere. [0003] There are two ways to produce methane from coke oven gas, namely chemical methods and physical methods. Among them, the methanation reaction principle of the chemical method is as follows: [0004] [0...

Claims

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Application Information

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IPC IPC(8): C07C9/04C07C1/04C07C1/12C07C7/12C07C7/144
Inventor 申曙光张金龙
Owner TAIYUAN UNIV OF TECH
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