How is hydrogen produced in the hydrorefining process of crude benzene?

Hydrogen production or extraction – a process specific to the crude benzene refining unit, or hydrogen supplied from outside! This post was last edited by ryn on 2009-3-20 14:41]

Is a hydrogen content of 55–60% in coke oven gas not enough? This post was last edited by ryn on 2009-3-20 21:32]

For crude benzene refining, 55% hydrogen is not sufficient; pure hydrogen is required. Hydrogen can indeed be extracted from coke oven gas. It is said that Germany’s Wood Company has good hydrogen extraction technology!

Don’t you have a hydrogen production system there? Hydrogen with a purity of 55%–60% is simply not sufficient.

As stated in the previous feasibility study, Sichuan Tianyi’s hydrogen production technology is being used. The hydrogen production unit uses pressure swing adsorption technology to purify hydrogen from coke oven gas. The process flow is briefly described as follows: The coke oven gas coming from the recovery workshop is passed through a gas-liquid separator to remove any entrained condensate. Part of this gas is sent to the hydrodesorption unit via a gas compressor to serve as a heat source, while another part is compressed by a gas compressor and then sent to the coke oven gas pretreatment device. Here, impurities such as tar mist, high-carbon alkanes, benzene, naphthalene, sulfides, and nitrogen oxides are removed from the gas, after which it is sent to the pressure swing adsorption (PSA) process. Through pressure swing adsorption separation, most of the impurities in coke oven gas—such as CO, CO2, O2, N2, CH4, and C2–C4 hydrocarbons—are removed, thereby concentrating and purifying the hydrogen; the purity of the hydrogen can reach over 99.99%. This hydrogen is then dried by deoxygenation, pressurized by a make-up gas compressor, and sent to the hydroprocessing unit as the feed gas for hydroprocessing.

Uhde is very expensive; in China, hydrogen production mainly relies on coke oven gas and methanol

Are there many plants in China that produce hydrogen using coke oven gas these days?

Our company uses pressure swing adsorption technology to extract hydrogen from coke oven gas

Now the plant is running on methanol, and hydrogen is being extracted from the methanol off-gases

Our company extracts it using its own existing resources.

The hydrogen source should be determined through comprehensive consideration of factors such as the location of construction, the resources available to the owner, and production costs. If a company or the local area has coke oven gas, hydrogen can be produced via pressure swing adsorption; it can also be generated through methanol cracking or natural gas conversion, or by converting heavy oil or naphtha, among other methods