Discussion on the cooling capacity source for low-temperature methanol washing
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As is well known, in the purification process of process gases, the low-temperature methanol washing process is highly favored by production units for removing acidic gases. So, which cooling medium is safer, more economical, and more stable for supplying cold energy to the lean methanol stream?
This post was last edited by defeil on 2016-11-23 at 14:22. There are only a few types of refrigerants, and the main difference lies in their cooling temperature ranges: lithium bromide can achieve temperatures ranging from 5 to -10 degrees; ammonia can achieve temperatures from -2 to -30 degrees; propylene can achieve temperatures from -25 to -45 degrees; and ethylene can achieve temperatures from -35 to -55 degrees. As for cost efficiency, it depends on the specific process involved. The latter three refrigerants are suitable for use after low-temperature methanol washing; the choice should be based on the products produced downstream in the facility. If ammonia is produced internally, then ammonia refrigeration is the appropriate choice; if ethylene or propylene is produced internally, then those corresponding refrigerants are more suitable. Additionally, stability isn’t greatly affected by the type of refrigerant used