A process for producing low-carbon alcohol from syngas combined with coke oven gas

Abstract

The invention discloses a technology for preparing low-carbon alcohol from syngas and coke oven gas. The technology comprises the following steps: mixing coke oven gas and syngas to form crude raw material gas for low-carbon alcohol synthesis; washing the crude raw material gas by low temperature methanol to remove the impurities such as hydrogen sulfide, carbon dioxide, and the like to produce purified gas for low-carbon alcohol synthesis, recycling the removed hydrogen sulfide after the sulfur is removed, discharging carbon dioxide into the sky; subjecting the purified gas to low-carbon alcohol synthesis, separating the synthesis products, which are in a gas phase and a liquid phase, to obtain a gas product, which is mainly composed of CO, H2 and CO2, and a liquid product, which is a mixture of alcohol and water, subjecting the gas product to the low temperature methanol washing and circulation, combusting the other part of gas product in a torch as exhausted gas or discharging the gas product; and separating the alcohol from the liquid product so as to obtain the low-carbon alcohol product. The technology can obtain a plurality of products, can reduce the excessive production capacity, promote the energy saving and discharge reducing, and adjust the energy structure.

Description

technical field [0001] The invention belongs to a process for synthesizing low-carbon alcohols, in particular to a process for producing low-carbon alcohols by combining synthesis gas with coke oven 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 good explosion-proo...

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Problems solved by technology

[0006] The process of the present invention is based on the characteristics that coke oven gas has more hydrogen and less carbon, while the synthesis gas has more carbon and less hydrogen, and complements the advantages of the two to meet the hydrogen-to-carbon ratio of synthesizing low-carbon alcohols, so as to solve the problem of using coke oven gas alone to produce low carbon alcohols. Carbon alcohols need carbon supplementation, or low-carbon alcohols using synthesis gas alone need hydrogen supplementation, which provides an effective way for the rational use of coke oven gas, which is conducive to product diversification, regulating excess capacity, promoting energy conservation and emission reduction, and adjusting The energy structure can also significantly improve the economic benefits and social and environmental benefits of the enterprise

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