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volatile ) fractions can also be used to produce asphalt , tar , paraffin wax , lubricating and other heavy oils. refineries also produce other chemicals , some of which are used in chemical processes to produce plastics and other useful materials. since petroleum often contains a few percent sulfur -containing
may be shipped in bulk to a site to prepare as packaged blocks. used for wax emulsions, construction board, matches, candles, rust protection, and vapor barriers. sulfur (or sulfuric acid ), byproducts of sulfur removal from petroleum which may have up to a couple percent sulfur as organic sulfur-containing...
https://en.wikipedia.org/wiki/Oil_refinery