Method for producing methanol from semi-coke furnace tail gas

A technology of semi-coke tail gas and methanol synthesis, which is applied in chemical instruments and methods, preparation of hydroxyl compounds, preparation of organic compounds, etc., and can solve the problems of high cost and large investment

Active Publication Date: 2013-02-13
SOUTHWEST RES & DESIGN INST OF CHEM IND
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Problems solved by technology

However, the autothermal conversion in the current production process requi

Method used

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  • Method for producing methanol from semi-coke furnace tail gas

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Embodiment

[0027] The main composition (vol%) of the semi-coke tail gas in this embodiment is: H 2 : 23.9, CH 4 : 7.7, CO: 15.4, CO 2 : 9.5, C n h m : 2.4, N 2 : 40.6, O 2 : 0.5. The gas volume is 1000kmol, and the temperature is 40°C.

[0028] (1) Pre-purification

[0029] A dry purification temperature swing adsorption method is used to remove macromolecular impurities such as tar, naphthalene, benzene and dust in the semi-coke tail gas, and a rough purified semi-coke tail gas is obtained.

[0030] (2) Mix coke oven gas with high hydrogen-to-carbon ratio gas source and semi-coke tail gas, so that the hydrogen-to-carbon ratio in the raw material entering the methanol synthesis process satisfies the following expression f=(H 2 -CO 2 ) / (CO+CO 2 )=2.05~2.15.

[0031] The main composition (vol%) of coke oven gas is: H 2 :58,CH 4 : 26, CO: 7.1, CO 2 : 2.7, C n h m : 2.5, N 2 : 3.2, O 2 : 0.5. The gas volume is 1145kmol, and the temperature is 40°C.

[0032] (3) Compressio...

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Abstract

The invention discloses a method for producing methanol from semi-coke furnace tail gas. The method is characterized in that the air separation unit and the step of producing the methanol through auto-thermal reforming are omitted on the basis of the existing methanol synthesis process, the semi-coke tail gas is mixed with one or more gas sources high in hydrogen-carbon ratio by a physical method, so that the hydrogen-carbon ratio in the raw material entering the methanol synthesis step satisfies the expression that f=(H2-CO2)/(CO+CO2)=2.05-2.15, and industrial methanol satisfying GB338-2004 is obtained through three-tower rectification; therefore, the process is simplified, the investment is reduced, the environmental pollution problem caused by direct emission or burning of the semi-coke tail gas is solved and the emission of sulfides, dust and hydrocarbon is reduced; besides, the recycling of the industrial effluent gas: semi-coke tail gas is also realized so that the economic benefit of the semi-coke enterprise is improved.

Description

technical field [0001] The invention relates to the field of chemical utilization of semi-coke tail gas, in particular to a method for synthesizing methanol by using semi-coke tail gas as a raw material. Background technique [0002] Semi-coke, also known as semi-coke, is a solid substance with high fixed carbon content produced by using Jurassic non-caking coal and weakly caking coal as raw materials by medium and low temperature dry distillation process, because it produces blue flame when burning name. During the production of semi-coke, semi-coke tail gas and coal tar are produced as by-products. At present, about 700Nm of semi-coke is produced per ton of semi-coke 3 Exhaust gas, calorific value 1700~2000 kcal. In 2010, the national semi-coke production was about 10 million tons, that is, the by-product semi-coke tail gas was about 7 billion Nm 3 . During the 12th Five-Year Plan period, my country's semi-coke market is expected to reach more than 50 million tons per ...

Claims

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Application Information

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IPC IPC(8): C07C31/04C07C29/153
Inventor 李泽军谭青杨宽辉易竖棚
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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