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What are the additives for dewaxing equipment?
Well-known dewaxing aids are condensation polymers of chlorinated paraffins and naphthalenes, polyalkylacrylates, polyalkylmethacrylates, a-olefin copolymers, ethylene-vinyl acetate copolymers, alkyl fumarate-vinyl acetate copolymers, polyethyleneoxides, polyvinylpyrrolidones, polyisobutylenes, polybutadienes, polystyrene-butadiene copolymers, alkali metal stearates, polyalkylene glycols, fatty acid glycerides, etc. These dewaxing aids may be used either alone or in mixtures of two or more dewaxing aids, typical examples of such mixtures being polyalkylmethacrylates and chlorinated paraf- fin/naphthalene condensation polymers; or polyalkylmethacrylates and ethylene-vinylacetate copolymers, etc., mixed in various proportions. In order for these dewaxing aids to be efficient in that their use reduces the amount of fine particles produced and, thereby, the wax separation (filtration) rate is increased, they should be of relatively high molecular weight and possess a broad distribution of molecular weight. Dewaxing aids having molecular weights from 1,000 to approaching or exceeding 5,000,000 have been successfully employed. These dewaxing aids are typically employed in an amount of active ingredient ranging from about 5 to 5,000 ppm of the waxy oil, preferably 50 to 2500 ppm, more preferably 100 to 500 ppm.