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Technology for synthesizing low carbon alcohol and hydrogen as byproduct from coke oven gas

A technology of coke oven gas and low-carbon alcohol, which is applied in the field of synthesis of low-carbon alcohol, can solve problems such as environmental pollution and energy waste, achieve the effects of enriching composition, realizing comprehensive utilization, and promoting energy saving and emission reduction

Active Publication Date: 2015-11-18
SEDIN ENG
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  • Summary
  • Abstract
  • 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 and methanol, there is an annual surplus of about 40 billion cubic meters of coke oven gas. The traditional method is to use it as waste gas fuel, causing huge environmental pollution and energy waste.

Method used

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  • Technology for synthesizing low carbon alcohol and hydrogen as byproduct from coke oven gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Coke oven gas (composed of H 2 : 51%, CO+CO 2 :18%, CH 4 : 24%, 5% N 2 and H 2 S: 1000ppm) enters the coke oven gas low-temperature methanol washing and purification system after being compressed, and desulfurizes and decarburizes at a temperature of -42°C and a pressure of 4.0MPa to obtain H 2 S2 2 S condensed gas desulfurization recovery, CO removal 2 De-coke oven gas reforming, the purified coke oven gas enters pressure swing adsorption, and the fine-pore silica gel is used as the adsorbent, the adsorption pressure is 4.0MPa, the desorption pressure is 0.3MPa, and the temperature is 8°C to remove CH 4 , the removed CH 4 with purified CO 2 Enter the coke oven gas reforming unit together, using a nickel-based catalyst, reforming at a reforming temperature of 560 ° C, and a pressure of 4.5 MPa. The reformed gas and coke oven gas after pressure swing adsorption are combined to form H 2 The low-carbon alcohol synthesis gas with a / CO molar ratio of 3.5 enters two l...

Embodiment 2

[0027] Coke oven gas (composed of H 2 : 55%, CO+CO 2 : 17%, CH 4 : 23%, 5%N 2 and H 2 S: 2000ppm) enters the coke oven gas NHD (polyethylene glycol dimethyl ether) purification system after being compressed, and desulfurizes and decarburizes at a temperature of 1°C and a pressure of 2.6MPa to obtain H 2 S2 2 S condensed gas desulfurization recovery, CO removal 2 De-coke oven gas reforming, the purified coke oven gas enters pressure swing adsorption, using fine-pore silica gel as the adsorbent, adsorption pressure 4.5MPa, desorption pressure 0.4MPa, and temperature 12°C to remove CH 4 , the removed CH 4 with purified CO 2 Enter the coke oven gas reforming unit together, using a cobalt-based catalyst, reforming at a reforming temperature of 600°C and a pressure of 4.0 MPa, and the reformed gas merges with the coke oven gas after pressure swing adsorption to form H 2 The low-carbon alcohol synthesis gas with a molar ratio of 4.0 / CO enters the low-carbon alcohol fixed-bed r...

Embodiment 3

[0029] Coke oven gas (composed of H 2 : 53%, CO+CO 2 :18%, CH 4 : 25%, 4%N 2 and H 2 S: 2500ppm) enters the coke oven gas low-temperature methanol washing and purification system after being compressed, and desulfurizes and decarburizes at a temperature of -45°C and a pressure of 5.0MPa to obtain H 2 S2 2 S condensed gas desulfurization recovery, CO removal 2 De-coking oven gas reforming, the purified coke oven gas enters pressure swing adsorption, using activated carbon as the adsorbent, adsorption pressure 4.8MPa, desorption pressure 0.2MPa, and temperature 15℃ to remove CH 4 , the removed CH 4 with purified CO 2 Enter the coke oven gas reforming unit together, using a cobalt-based catalyst, reforming at a reforming temperature of 620°C and a pressure of 5.0 MPa, and the reformed gas merges with the coke oven gas after pressure swing adsorption to form H 2 The low-carbon alcohol synthesis gas with a / CO molar ratio of 2.7 enters three low-carbon alcohol fixed-bed reac...

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Abstract

A technology for synthesizing low carbon alcohol and hydrogen as byproduct from coke oven gas comprises the following steps: compressing the coke oven gas, carrying out desulphurization and decarburization treatment to obtain purified coke oven gas with the H2S content being smaller than 1ppm, allowing the purified coke oven gas to enter a pressure swing adsorption unit in order to remove CH4, allowing removed CH4 and CO2 obtained after purification to enter a coke oven gas reforming unit, reforming, mixing the obtained reformed gas with the coke oven gas obtained after pressure swing adsorption to obtain synthetic gas meeting low carbon alcohol synthesis requirements, carrying out low carbon alcohol synthesis, allowing the obtained low carbon alcohol mixture to enter a low carbon alcohol separation unit, and separating to obtain methanol, ethanol, propanol and butanol products. The technology comprises the advantages of reasonable utilization of the coke oven gas, promotion of energy saving and emission reduction, energy structure adjustment, and obvious improvement of the economic and environmental benefits.

Description

technical field [0001] The invention belongs to a process for synthesizing low-carbon alcohols, in particular to a process for synthesizing low-carbon alcohols from coke oven gas and by-producing hydrogen. technical background [0002] Low carbon alcohol usually refers to the mixture of C1~C5 alcohols. The application prospect is very wide: 1. It is used as an alternative fuel. Although its calorific value is low, it is fully combusted and emits less CO, NOx, hydrocarbons, etc. during combustion. It is an environmentally friendly fuel; 2. Used as a fuel additive However, the currently used gasoline additive methyl tert-butyl ether will eventually be banned with the advancement of technology due to storage and transportation problems, which provides an opportunity for the development of low-carbon alcohols. At the same time, low-carbon alcohols have great value as chemical products and raw materials for bulk chemical production. [0003] my country is the world's largest co...

Claims

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Application Information

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IPC IPC(8): C07C29/151C07C31/02C01B3/56
CPCC01B3/508C07C29/1518C07C31/02Y02P20/10Y02P20/54
Inventor 崔晓曦李晓马英民曹会博王贵王军亭
Owner SEDIN ENG
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