Introduction to deep cryogenic and medium cryogenic separation processes for olefin separation?
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Introduction to deep cryogenic and medium cryogenic separation processes for olefin separation?
SW refers to cryogenic processes, right? In the methanol-to-olefins process, there is more cold separation involved; for example, the pre-deethanization process used by Sinopec, and the pre-depropanization process used by Lemmus
The two are roughly the same; the main difference lies in the components. In traditional ethylene production, since there is more methane and hydrogen as pyrolysis products compared to coal-based chemical processes, it is necessary to separate methane and hydrogen in order to ensure that the ethylene product meets quality standards, and these gases are then recovered for use as fuel gas. Therefore, a lower temperature and multiple ethylene refrigeration compressors are required. The structure of the cryogenic box becomes more complex, while everything else remains roughly the same.