Problems with water-soluble acids and bases in gasoline
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Gentlemasters, does anyone understand why gasoline becomes alkaline after hydrogenation (without undergoing any alkali treatment before or after hydrogenation)??????? ? ? ? ? ? ? ? ? ? ? ? I asked for advice! ! ! ! ! ! ! ! !
Gasoline contains impurities containing sulfur and nitrogen; during hydrogenation, in addition to the olefins in gasoline becoming partially saturated, the sulfur- and nitrogen-containing compounds form hydrogen sulfide and ammonia. Hydrogen sulfide is acidic, while ammonia is basic; however, the acidity of hydrogen sulfide is many times stronger than that of ammonia. Therefore, before hydrogenation, the water-soluble substances in hydrocarbon gasoline exhibit neither acidity nor basicity, but after hydrogenation, the formation of ammonia causes these water-soluble substances to become basic. In this case, most of the hydrogen sulfide and ammonia can generally be removed through stripping.
We did not design a stripping tower later on; only a hydrogen stripping tower was installed after Section 1 – (after hydrogen stripping, the oil product becomes neutral.) A stabilizer (reboiler) was installed after Section 2