Process employing coke-oven gas for production of methane

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...

AI Technical Summary

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; finally, the methane separation in the reacted methane mixed gas and the methane separation of the raw material gas are carried out in the same device, and the remaining gas after separation continues to undergo methanation reaction , solve the problem of reuse of remaining resources in the equipment and reaction process, and make the whole process realize continuous production

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