What is a good method for separating hydrogen from coke oven gas?

Hydrogen is recovered from coke oven gas; due to its complex composition, the gas contains large amounts of sulfur, C2+, phenols, benzene, naphthalene, and other organic substances. It is difficult to reduce the concentration of all these organic substances to below 10PPM before pressure swing adsorption. By using renewable adsorbents, it is possible to prevent these organic substances from reaching the front part of the adsorption bed, and the desorbed gas can be used to remove them without contaminating the adsorbent. As a result, the operating costs may be lower. Furthermore, when recovering hydrogen from coke oven gas, the pressure requirement is generally not high; 0.8–2.5 MPa is sufficient, and the operation is simple. I would appreciate everyone’s feedback on whether this view is correct.

It must be PSA, as our facility is a steel plant where PSA is used – it first filters out some benzene and phenols, and after several adsorption steps, the desired purity is achieved. In terms of investment, complete systems are usually required; there are companies in Chengdu that deal with this, and you can contact them. Most of the components used are those that operate at normal temperatures, which makes them much cheaper than those that require low temperatures. Operation and maintenance are very convenient, as the process takes place at normal temperatures without the need for sophisticated insulation measures. In summary, PSA is recommended; cryogenic methods are not advisable due to their high costs and high maintenance expenses

PSA is recommended; indeed, under normal gas flow rates, PSA performs much better than cryogenic methods, mainly in terms of investment and operating costs. There is currently no information available regarding the specific gas flow rate at which this threshold is reached.

Generally speaking, the PSA value is good; at present, the production capacity of the plants operated by Shanxi Sanwei reaches over 30,000 cubic meters per hour. Of course, it also depends on the uses of hydrogen and the other gases. In the PSA process, the hydrogen pressure is high, which facilitates its use in other processes; however, the pressure of the gas obtained after separation, which is poor in hydrogen and rich in methane, is low. The cryogenic process must liquefy other gases in order to separate hydrogen; if you do not need those other products in liquid form, the cost of extracting hydrogen becomes too high. Furthermore, the composition of coke oven gas is complex, making gas treatment prior to cryogenic processing very complicated.

Hehe, it must be pressure swing adsorption! The construction costs for hydrogen stations vary as follows: when there is an inexpensive source of hydrogen, such as the gas produced by steel mills or the exhaust gases from ammonia production, PSA can be used, which is the cheapest option. We have a practical example of this – in a steel mill with a production capacity of 1,000 NM3/h, pressure swing adsorption is utilized! I suggest you use Ah! If there is no cheap source of hydrogen, then it is necessary to produce hydrogen itself. In China, hydrogen is most often produced by the cracking of methanol, followed by PSA adsorption separation; cryogenic methods are used as well, but they are more costly. The above are the methods used for large-scale hydrogen production. When the demand is relatively low, water electrolysis is generally employed for hydrogen production, although this method consumes a lot of electricity – approximately 4-5 kWh per 1 NM3 of hydrogen produced! I’m not sure if it can meet your requirements!