Selection of gas purification process
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For the production of methanol from coke oven gas, which gas purification process is the most suitable? An evaluation is provided from the aspects of investment, operating costs, process maturity, operability, and floor space requirements.
It depends on the scale; for amounts over 300,000 tons, low-temperature methanol washing is a more suitable option
Low-temperature methanol washing is the best option, as crude gas contains relatively high levels of impurities such as sulfides, carbides, and ammonia
For a scale of 300,000, NHD is sufficient to meet the requirements; the investment required for methanol washing is too high
First, you need to consider your production scale; if it is large enough, you can opt for low-temperature methanol washing for desulfurization and decarbonization, Claus process for sulfur recovery, and sulfur-resistant shift reaction
This is a rather complex issue that requires considering various aspects, identifying the appropriate manufacturing process, and estimating the cost of the project
Methanol is produced from coke oven gas, with the gas purification process employing the sulfolane method for desulfurization and the Benfield method for decarburization.
This is a complex issue; first, the production scale needs to be considered, and only after thorough evaluation can a decision be made regarding the appropriate manufacturing process to use.
It is also feasible to use pressure swing adsorption to purify coke oven gas. However, low-temperature methanol washing achieves a high level of purification, enabling the removal of most acidic gases such as CO2, H2S, organic sulfur, and coal tar.
The main differences lie in the desulfurization and ammonia washing systems; a detailed comparison can be made. The benzene processing systems are generally similar; it is advisable to choose processes that offer good environmental performance, although such processes require higher investment, while those with lower investment levels result in poorer environmental outcomes
For the production of methanol from coke oven gas, the TV (tannin) method or the TV + sulfonated cobalt phthaloquinone method can be used for wet desulfurization; followed by dry iron-molybdenum desulfurization, hydrogenation conversion, and zinc oxide treatment for final purification. There is no need for decarburization; instead, carbon needs to be added.
The TV method or TV+cobalt phthalocyanine sulfonation wet desulfurization is a mature technology; it requires much less space compared to low-temperature methanol washing and NHD. It consists of three main components: desulfurization, regeneration, and sulfur recovery. The equipment includes a desulfurization tower, regeneration tank, lean liquid tank, rich liquid tank, sulfur melting kettle, lean liquid pump, rich liquid pump, etc. Dry desulfurization requires only a few stationary units, thus occupying very little space.