What are the process technologies for the pretreatment of hydrogen production from coke oven gas?

In addition to pressure swing adsorption, temperature swing adsorption, and membrane separation technologies, there are several other process techniques for the pretreatment of coke oven gas to produce hydrogen: 1. Active adsorption method: This involves using active adsorbents such as activated carbon and molecular sieves to absorb CO and CO2, thereby removing impurities from the gas. Compared to pressure swing adsorption and temperature swing adsorption, active adsorption can be carried out at higher temperatures and possesses better resistance to contamination. However, the waste it generates is difficult to handle. 2. Low-temperature catalytic method: CO and water vapor react under the action of a catalyst to produce CO2 and hydrogen; by adjusting parameters such as the type and ratio of the catalyst, as well as the reaction temperature, it is possible to achieve a high conversion rate of CO and high purity of hydrogen. However, this technology requires a large amount of energy, and the catalyst is prone to contamination and deactivation. 3. Isothermal adsorption method: After the coke oven gas undergoes isothermal adsorption for a certain period of time, desorption is carried out to remove CO and CO2. The isothermal adsorption method has advantages such as simple operation and reliable equipment, but it has certain requirements regarding gas flow rate and adsorbent selection. The advantages and disadvantages of these technologies are as follows: - Pressure swing adsorption and temperature swing adsorption: they can produce hydrogen of high purity, but they require a large amount of space and have high energy consumption. - Membrane separation: It has a small size and low energy consumption; however, it requires pre-treatment of the gas, and there is a risk of membrane fouling and damage. - Active adsorption: Suitable for gas treatment under high-temperature conditions, but the resulting waste is difficult to handle. - Low-temperature catalytic method: It enables efficient hydrogen purification, but it has high energy consumption and a limited catalyst lifespan. - Isothermal adsorption method: It is simple to operate and the equipment is reliable, but it has certain requirements regarding the adsorbent and gas flow rate. -

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