Coke oven gas and synthesis gas production process of low-carbon alcohol and by-product natural gas

Abstract

A process of coke oven gas and synthesis gas to produce low-carbon alcohol and by-product natural gas is to mix coke oven gas and synthesis gas to form crude raw material gas, which is compressed and washed with low-temperature methanol, and the released hydrogen sulfide is recovered by Claus sulfur removal, The removed carbon dioxide is discharged at high altitude; the raw material gas washed and purified by low-temperature methanol is subjected to cryogenic separation, and the extracted methane is produced into LNG products. , the gas is separated by PSA. After the separation, it mainly includes CO and H2 and returns to the low-temperature methanol washing cycle. The other gases after separation are sent to the flare for combustion and emission as purge gas. The separated liquid phase products enter the low-carbon alcohol separation to obtain low-carbon alcohol products. The invention has the advantages of improving the utilization rate of the raw material gas, diversifying the products and regulating the excess production capacity.

Description

technical field [0001] The invention belongs to a process for synthesizing low-carbon alcohol, in particular to a process for producing low-carbon alcohol and by-product natural gas from coke oven gas and synthesis gas. Background technique [0002] Low carbon alcohol usually refers to the mixture of C1~C5 alcohols. The application prospects are very wide: both as an alternative fuel and as a fuel additive. When low-carbon alcohol is used as an alternative fuel, it burns fully, and emits less CO, NOx, hydrocarbons, etc. during combustion, so it is an environmentally friendly fuel; low-carbon alcohol has a bright future as a fuel additive, and the currently used gasoline additive methyl tert-butyl Due to the problems of storage and transportation, base ethers will eventually be banned with the advancement of science and technology, which provides an opportunity for the development of low-carbon alcohols. Moreover, the low-carbon alcohol has a high octane number, and has goo...

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Problems solved by technology

At present, in addition to the production of synthetic ammonia and methanol, coke oven gas has a surplus of nearly 30 billion cubic meters of coke oven gas per year. Due to the characteristics of "more hydrogen and less carbon" in the composition of coke oven gas, the energy utilization rate of coke oven gas at this stage is about 55%. , resulting in huge waste of energy and environmental pollution,

[0004] my country is rich in coal resources, especially low-quality lignite in Inner Mongolia, Xinjiang and other places. The synthesis gas produced by the gasifier is used for the synthesis of chemical products. The synthesis gas has the characteristics of more carbon and less hydrogen. (The volume percentage of the gas composition of the synthesis gas is: CO: 45-60%, H 2 : 22-28%, CO 2 : 12-20, CH 4 : 8-12%, H 2 S: 0.21); It can be seen that the production of low-carbon alcohols from coke oven gas or synthesis gas alone has the problem of insufficient utilization of components: coke oven gas has more hydrogen and less carbon, and a large amount of hydrogen will inevitably be left in the synthesis of low-carbon alcohols alone, or Additional carbon sources need to be supplemented; while syngas has more carbon and less hydrogen, a large amount of carbon will be left in the synthesis of low-carbon alcohols alone, or additional hydrogen sources need to be supplemented

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