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Possible definitions for iatrochemic
petrochemical
Strictly, any of a large class of chemicals (as distinct from fuels) derived from petroleum and natural gas. The category has been broadened to include a much larger range of organic compounds and a few inorganic compounds (incl. carbon black, sulfur, and ammonia). Some materials are hard to classify because they have alternative sources (benzene from coal, ethanol from fermentation). Like crude oil and natural gas, most petrochemicals consist mainly of carbon and hydrogen and are called hydrocarbons. Petrochemicals used as raw materials ("feedstocks") include ethylene (highest volume), propylene, butadiene, benzene, toluene, xylene, and naphthalene. Petrochemical products include plastics (polyethylene, polypropylene, polystyrene), soaps and detergents, solvents, drugs, fertilizers, pesticides, explosives, synthetic fibers, rubbers, paints, epoxies, flooring and insulating materials, luggage, and recording disks and tapes.
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