Method and system for directly preparing alcohol from coke oven gas

Abstract

The invention discloses a method and system for directly preparing alcohol from coke oven gas. The method comprises the steps of purifying coke oven gas to obtain refined coke oven gas, separating andextracting hydrogen in the coke oven gas through hydrogen extraction, reforming the hydrogen extracted coke oven gas and carbon dioxide in a dry reformer to obtain synthesis gas, mixing the synthesisgas with the separated and purified hydrogen, introducing the mixed gas into an ethanol synthesis device to obtain crude alcohol, and executing separation and refining to obtain a product. The methodis wide in adaptability, no additional hydrogen element is introduced, and methanol, ethanol or other alcohols are produced by adjusting the hydrogen-carbon ratio.

Description

Technical field [0001] The invention belongs to the field of coke oven gas, and specifically relates to a method and system for directly producing alcohol from coke oven gas. Background technique [0002] Ethanol is a gasoline quality improver with excellent performance. Adding a certain proportion of ethanol to gasoline can significantly increase the octane number and anti-knock performance of gasoline, and at the same time improve the combustion efficiency of gasoline, and effectively reduce CO emissions and CO emissions in automobile exhaust. Emissions of other toxic substances. The "Implementation Plan on Expanding Biofuel Ethanol Production and Promoting the Use of Ethanol Gasoline for Vehicles" jointly issued by 15 departments including the National Development and Reform Commission and the National Energy Administration of China clearly requires that by 2020, the use of vehicles should be promoted nationwide. Use ethanol gasoline. In 2017, China's apparent gasoline consu...

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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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