Method and system for directly producing alcohol from coke oven gas

Abstract

The invention discloses a method and system for directly producing alcohol from coke oven gas. The method comprises: obtaining refined coke oven gas after purification of coke oven gas, and then extracting hydrogen from the coke oven gas through separation and hydrogen extraction, and coke after hydrogen extraction. Furnace gas and carbon dioxide are reformed in a dry reformer to obtain synthesis gas, which is mixed with separated and purified hydrogen and passed into an ethanol synthesis unit to obtain crude alcohol, which is then separated and refined to obtain the product. The method of the invention has wide adaptability, does not introduce additional hydrogen elements, and produces methanol, ethanol or other alcohols by adjusting the ratio of hydrogen to carbon.

Description

technical field [0001] The invention belongs to the field of coke oven gas, and in particular relates to a method and system for directly producing alcohol from coke oven gas. Background technique [0002] Currently, ethanol synthesis methods mainly rely on grain fermentation and chemical synthesis. The cost of grain fermentation is high, and there is a risk of taking grain from others. There are two types of chemical synthesis methods: petrochemical synthesis and coal chemical synthesis. Since my country's energy structure is "rich in coal and poor in oil", the preparation of ethanol from the coal chemical route has become the most promising process route in the future. my country's coking industry produces a large amount of coke oven gas, part of which is used for its own coking and chemical production, and the other part is directly discharged or burned. The main components of coke oven gas are hydrogen, methane, a small amount of carbon monoxide, carbon dioxide, nitrog...

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Problems solved by technology

The existing patent CN 104086368B "Method for H / C Adjustment of Coke Oven Gas to Methanol Hydrogen-Carbon Ratio" uses water vapor + pure oxygen solid gasifier to adjust the hydrogen-carbon ratio, which not only increases the consumption of the gasifier, but also The cost of purchasing pure oxygen or building an air separation plant to prepare pure oxygen remains high. At the same time, water vapor regulation will introduce excess hydrogen

And this method does not introduce new carbon elements, only relying on methane conversion in coke oven gas to reduce the hydrogen-carbon ratio, the adjustable range is small, and the energy consumption is relatively high

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