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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.
Polypropylene is occasionally recycled. PP is strong and can. usually withstand higher temperatures. It is used to make lunch. boxes, margarine containers, yogurt pots, syrup bottles, prescription bottles. Plastic bottle caps are often made from PP. Polystyrene is commonly recycled, but is difficult to do. Items. such as disposable coffee cups, plastic food boxes, plastic cutlery. and packing foam are made from PS. Code 7 is used to designate miscellaneous types of plastic not. defined by the other six codes. Polycarbonate and Polylactide are. included in this category. These types of plastics are difficult to. recycle. Polycarbonate (PC) is used in baby bottles, compact discs, and medical storage containers.