Composition of C4 impurities in the gas phase
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Dear teachers, I would like to ask: after C2 and C3 compounds are removed from conventional catalytic liquefied gas through gas separation, and then the gas undergoes alkali washing and water washing, what is the level of impurities in the C4 fraction? The main impurities are water, total sulfur, total nitrogen, H2S+COS, amines, basic nitrogen, chlorine, and NaOH. Typical refineries can measure total sulfur, but there are no methods to analyze other impurities.
Your liquefied gas should also have been treated with ammonia, which means that sulfur and thiol compounds are generally removed to a large extent. The amount of water present is likely at the ppm level. Ammonia and alkaline solutions can usually be removed through washing, so the gas essentially contains no impurities