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Method for synthesizing lower alcohol by coke oven gas and secondarily producing natural gas and liquid ammonia

A technology for coke oven gas and low-carbon alcohol, which is applied in chemical instruments and methods, preparation/separation of ammonia, preparation of organic compounds, etc., can solve problems such as energy waste and environmental pollution, reduce production costs, and improve enterprise economy. benefits, social and environmental benefits, and the effect of improving utilization

Active Publication Date: 2015-12-02
SEDIN ENG
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the annual production capacity of coke oven gas is nearly 200 billion Nm 3 , in addition to the production of synthetic ammonia, methanol and factory gas, there is a surplus of about 40 billion cubic meters of coke oven gas per year. The traditional method is to use it as waste gas fuel, and the energy utilization rate is about 55%. However, remote areas are discharged in vain, causing huge environmental pollution and energy waste

Method used

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  • Method for synthesizing lower alcohol by coke oven gas and secondarily producing natural gas and liquid ammonia

Examples

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Effect test

Embodiment 1

[0029] The coking coal and the oxygen produced by the air separation unit are sent to the coke oven to obtain coke products and crude coke oven gas; the crude coke oven gas is compressed and enters the coke together with the purge gas separated by PSA (pressure swing adsorption). Furnace gas low-temperature methanol washing and purification system, desulfurization treatment is carried out under the conditions of temperature -48°C and pressure 4.2MPa to obtain H 2 Purified coke oven gas with S2 S condensed gas desulfurization and recovery; the purified coke oven gas adopts the cryogenic separation technology of American Chemtex and Berkeley Weizi Company, and separates CH at a temperature of -159°C and a pressure of 4.0MPa. 4 , separated CH 4 Made into LNG (liquefied natural gas) products;

[0030] Separation of CH 4 The final coke oven gas enters two low-carbon alcohol fixed-bed reactors in series, and the fixed-bed reactors are filled with MoS from DOW Chemical Company of t...

Embodiment 2

[0034] The coking coal and the oxygen produced by the air separation unit are sent to the coke oven to obtain coke products and crude coke oven gas; the crude coke oven gas is compressed and enters the coke together with the purge gas separated by PSA (pressure swing adsorption). Furnace gas low-temperature methanol washing and purification system, desulfurization treatment is carried out under the conditions of temperature -50°C and pressure 4.5MPa to obtain H 2 Purified coke oven gas with S2S condensed gas desulfurization recovery; the purified coke oven gas is subjected to pressure swing adsorption to separate methane, and activated carbon is used as the adsorbent to separate CH at a temperature of 15°C, an adsorption pressure of 4.8 MPa, and a desorption pressure of 0.6 MPa. 4 , separated CH 4 Made into CNG (compressed natural gas) products;

[0035] Separation of CH 4 The final coke oven gas enters three low-carbon alcohol fixed-bed reactors connected in series. The fix...

Embodiment 3

[0039] The coking coal and the oxygen produced by the air separation unit are sent to the coke oven to obtain coke products and crude coke oven gas; the crude coke oven gas is compressed and enters the coke together with the purge gas separated by PSA (pressure swing adsorption). Furnace gas tannin extract method purification system for desulfurization treatment to obtain H 2 Purified coke oven gas with S2 S condensed gas desulfurization and recovery; the purified coke oven gas adopts the cryogenic separation technology of American Chemtex and Bockley Weizi Company, and separates CH at a temperature of -165°C and a pressure of 5.0MPa. 4 , separated CH 4 Made into LNG (liquefied natural gas) products;

[0040] Separation of CH 4 The final coke oven gas enters two low-carbon alcohol fixed-bed reactors connected in series. The fixed-bed reactors are filled with Zn-Cr catalysts from the Shanxi Institute of Coal Chemistry, Chinese Academy of Sciences. 2 / CO molar ratio 2.5, spac...

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Abstract

A method for synthesizing lower alcohol by coke oven gas and secondarily producing natural gas and liquid ammonia comprises: desulfurizing coarse coke oven gas which is compressed and purge gas after membrane separation together and recovering removed H2S; carrying out methane separation on the purified coke oven gas, wherein the removed CH4 is used as a CNG or LNG product; carrying out lower alcohol synthesis on the coke oven gas without CH4 to obtain a lower carbon mixed alcohol liquid product and C2-C5 hydrocarbon gas products as well as unreacted CO, CO2 and H2 gas; carrying out membrane separation by taking the gas product as purge gas, returning separated C2-C5 hydrocarbon gas products and unreacted CO and CO2 gas to a coke oven coal gas purification system, and carrying out ammonia synthesis on separated hydrogen and generated nitrogen which are converged to prepare a liquid ammonia product; and carrying out alcohol-water separation on the liquid product to obtain the lower alcohol product. The method provided by the invention has the advantage of improving the utilization ratio of raw material gas.

Description

technical field [0001] The invention belongs to a method for synthesizing low-carbon alcohols, in particular to a method for synthesizing low-carbon alcohols from coke oven gas and by-producting natural gas and liquid ammonia. Background technique [0002] Low-carbon mixed alcohols (referred to as low-carbon alcohols) refer to liquid mixtures composed of C1-C5 alcohols. The application prospects of low-carbon alcohols are very broad: one of the main uses is as a clean gasoline additive, mainly because low-carbon alcohols contain a large amount of higher alcohols (C2+ alcohols), which can significantly increase the octane number of gasoline and enhance its anti-explosion and shock resistance. Therefore, during the storage and transportation of gasoline, low-carbon alcohols are expected to fully replace the existing heavily polluting methyl tert-butyl ether (MTBE); secondly, low-carbon alcohols have sufficient combustion and CO emissions during combustion , NOx, less hydrocar...

Claims

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Application Information

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IPC IPC(8): C07C31/04C07C31/08C07C31/10C07C31/12C07C29/151C10L3/08C01C1/04
CPCC01C1/0488C07C29/1518C10L3/08C07C31/04C07C31/08C07C31/10C07C31/12
Inventor 李晓张庆庚崔晓曦曹会博马英民王军亭
Owner SEDIN ENG
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