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the first grade of polyethylene , produced in by imperial chemical industries (ici) using a high pressure process via free radical polymerization . [ ] its manufacture employs the same method today. the epa estimates % of ldpe ( recycling number ) is recycled. [ ] despite competition from more modern...
bauxite.bauxite consist of - % alumina, as well as earth silicon, ferrous oxide, and titanium dioxide. to separate pure alumina, the bayer process is applied. first, the ore is heated in an autoclave with caustic soda. it is then cooled and a solidresidue — â"red mudâ" — is separated from the liquid...
of the content from the book) hide coal coal carbonization byproducts (coal tar and coke-oven gas) were the main sources for the production of organic chemicals till the second world war. however, the abundant availability of cheap petroleum and natural gas caused a major shift from coal to these raw...