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Water is separated from the first overhead stream, and the resulting isobutylene-enriched stream is recycled back to the reaction step. The first bottoms stream is distilled to produce a bottoms product stream comprising diisobutylene and a second overhead stream comprising tertiary butyl alcohol and diisobutylene.he reaction product stream, comprising diisobutylene, isobutylene, TBA, and water, is purified by a process a shown in. . The reaction product stream is passed via line 11 to a first distillation tower 10. Tower 10 contains 35 ideal stages, 11 above feed and 24 below feed.
Isotretinoin: Overview Brand names: AbsoricaÂ®, AccutaneÂ®, AmnesteemÂ®, ClaravisÂ®, MyorisanÂ®, SotretÂ®, and Zenataneâ¢. Isotretinoin (eye-soh-tret-in-OH-in) is a prescription medicine for severe acne. This type of acne causes deep, painful cysts and nodules. These can be the size of a pencil eraser â or larger. As this acne clears, scars often appear. Severe acne can be difficult to treat. When other treatments fail to clear the skin, isotretinoin may be an option. About 85% of patients see permanently clear skin after one course of treatment with isotretinoin.