In addition to containing up to 90% ethylene, steam cracker C2 cuts have from 0.5 to 3% acetylene. This highly unsaturated compound is undesirable in both chemical- and polymer-grade ethylene. The most elegant way to remove acetylene is via hydrogenation to ethylene.
Ethylene production by steam cracking produces several by-products such as pyrolysis gasoline (pygas).
Raw pygas contains highly valuable components such as BTX (benzene, toluene, xylenes), unsaturated compounds like diolefins, styrenes and olefins, and sulfur-containing compounds. In order to recover BTX, the unsaturated compounds and sulfur compounds have to be removed efficiently. This is the target of Axens’ offer through two different stages of pygas hydrogenation : GHU-1 and GHU-2.
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