A process for producing low-carbon alcohol from syngas combined with coke oven gas

A technology for coke oven gas and low-carbon alcohol, which is applied in the field of synthesizing low-carbon alcohol, and achieves the effects of good thermal stability and chemical stability, adjustment of energy structure, and improvement of enterprise economic benefits and social environmental benefits

Active Publication Date: 2017-12-15
SEDIN ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The process of the present invention is based on the characteristics that coke oven gas has more hydrogen and less carbon, while the synthesis gas has more carbon and less hydrogen, and complements the advantages of the two to meet the hydrogen-to-carbon ratio of synthesizing low-carbon alcohols, so as to solve the problem of using coke oven gas alone to produce low carbon alcohols. Carbon alcohols need carbon supplementation, or low-carbon alcohols using synthesis gas alone need hydrogen supplementation, which provides an effective way for the rational use of coke oven gas, which is conducive to product diversification, regulating excess capacity, promoting energy conservation and emission reduction, and adjusting The energy structure can also significantly improve the economic benefits and social and environmental benefits of the enterprise

Method used

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  • A process for producing low-carbon alcohol from syngas combined with coke oven gas

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Experimental program
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Effect test

Embodiment 1

[0029] The coke oven gas (volume percentage is composed of H 2 : 54%, CH 4 : 23%, CO: 10%, CO 2 :7%,N 2 : 6%) and synthesis gas (volume percentage composition is CO: 50%, H 2 : 25%, CO 2 :12,CH 4 : 12%, H 2 S: 0.16%) is passed into the gas cabinet at a volume ratio of 7:1 and fully mixed to form a hydrogen-carbon molar ratio that satisfies the synthesis of low-carbon alcohols. 2 / CO = 3.5 raw material gas.

[0030] The crude raw material gas is compressed to 4.0MPa and enters the low-temperature methanol washing and purification device to remove impurities such as hydrogen sulfide and carbon dioxide. 2 S off to less than 0.1ppm, CO 2 Less than 20ppm, the pure gas for the synthesis of low-carbon alcohols is produced, and the hydrogen sulfide H removed 2 S desulfurization recovery, CO removal 2 Discharge at high altitude.

[0031]The purified gas enters two fixed-bed low-carbon alcohol reactors connected in series, both of which use modified Cu-Zn-Al-K catalysts from ...

Embodiment 2

[0035] The coke oven gas (volume percentage is composed of H 2 : 60%, CH 4 : 22%, CO: 9%, CO 2 :6%,N 2 : 3%) and synthesis gas (volume percentage composition is CO: 50%, H 2 : 27%, CO 2 : 11%, CH 4 : 12%, H 2 S: 0.20%) is passed into the gas cabinet at a volume ratio of 5:1 and fully mixed to form a hydrogen-carbon molar ratio that satisfies the synthesis of low-carbon alcohols. 2 / CO = 4.0 raw material gas.

[0036] The crude raw material gas is compressed to 4.5MPa and enters the low-temperature methanol washing and purification device to remove impurities such as hydrogen sulfide and carbon dioxide. 2 S off to less than 0.1ppm, CO 2 Less than 20ppm, the pure gas for the synthesis of low-carbon alcohols is produced, and the hydrogen sulfide H removed 2 S desulfurization recovery, CO removal 2 Discharge at high altitude.

[0037] The purified gas enters two fixed-bed low-carbon alcohol reactors connected in series. The first fixed-bed reactor adopts the Zn-Cr catal...

Embodiment 3

[0041] The coke oven gas (volume percentage is composed of H 2 : 58%, CH 4 : 24%, CO: 8%, CO 2 :6%,N 2 : 4%) and synthesis gas (volume percentage composition is CO: 50%, H 2 : 26%, CO 2 : 11%, CH 4 : 13%, H 2 S: 0.24%) is passed into the gas cabinet at a volume ratio of 3:1 and fully mixed to form a hydrogen-carbon molar ratio that satisfies the synthesis of low-carbon alcohols. 2 / CO = 2.7 raw material gas.

[0042] The crude raw material gas is compressed to 3.8MPa and enters the low-temperature methanol washing and purification device to remove impurities such as hydrogen sulfide and carbon dioxide. 2 S off to less than 0.1ppm, CO 2 Less than 20ppm, the pure gas for the synthesis of low-carbon alcohols is produced, and the hydrogen sulfide H removed 2 S desulfurization recovery, CO removal 2 Discharge at high altitude.

[0043] The purified gas enters three fixed-bed low-carbon alcohol reactors connected in series, and the first fixed-bed reactor adopts MoS from ...

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Abstract

The invention discloses a technology for preparing low-carbon alcohol from syngas and coke oven gas. The technology comprises the following steps: mixing coke oven gas and syngas to form crude raw material gas for low-carbon alcohol synthesis; washing the crude raw material gas by low temperature methanol to remove the impurities such as hydrogen sulfide, carbon dioxide, and the like to produce purified gas for low-carbon alcohol synthesis, recycling the removed hydrogen sulfide after the sulfur is removed, discharging carbon dioxide into the sky; subjecting the purified gas to low-carbon alcohol synthesis, separating the synthesis products, which are in a gas phase and a liquid phase, to obtain a gas product, which is mainly composed of CO, H2 and CO2, and a liquid product, which is a mixture of alcohol and water, subjecting the gas product to the low temperature methanol washing and circulation, combusting the other part of gas product in a torch as exhausted gas or discharging the gas product; and separating the alcohol from the liquid product so as to obtain the low-carbon alcohol product. The technology can obtain a plurality of products, can reduce the excessive production capacity, promote the energy saving and discharge reducing, and adjust the energy structure.

Description

technical field [0001] The invention belongs to a process for synthesizing low-carbon alcohols, in particular to a process for producing low-carbon alcohols by combining synthesis gas with coke oven gas. Background technique [0002] Low carbon alcohol usually refers to the mixture of C1~C5 alcohols. The application prospects are very wide: both as an alternative fuel and as a fuel additive. When low-carbon alcohol is used as an alternative fuel, it burns fully, and emits less CO, NOx, hydrocarbons, etc. during combustion, so it is an environmentally friendly fuel; low-carbon alcohol has a bright future as a fuel additive, and the currently used gasoline additive methyl tert-butyl Due to the problems of storage and transportation, base ethers will eventually be banned with the advancement of science and technology, which provides an opportunity for the development of low-carbon alcohols. Moreover, the low-carbon alcohol has a high octane number, and has good explosion-proo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C29/151C07C31/02C07C31/04C07C31/08C07C31/10
CPCC07C29/1516C07C31/02C07C31/04C07C31/08C07C31/10Y02P20/10
Inventor 李晓张庆庚崔晓曦马英民曹会博
Owner SEDIN ENG
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