The Dow Chemical Company

David E Busby

John C Scheifley

Clark R Shields

Feng-Chih Chang

Garnet E McConchie

German R Urioste

Jimmy D Orr

Susan A Wernl

Occluded organic solvent is removed from bisphenol crystals by placing in water maintained at a temperature sufficient to form a molten water-bisphenol phase, holding at that temperature for a time sufficient to transfer the organic solvent to the water phase, flash distilling the organic solvent, cooling molten water-bisphenol phase to produce crystallization and thereafter recovering the bisphenol.

Purification of bisphenols by removing residual solvent

Halogenated hydrocarbon materials are burned in an internally-fired horizontal fire-tube boiler and the heat of combustion directly produces saturated steam. Halogen values may be recovered from the combustion gases, e.g., by being absorbed in water. Thus halogenated hydrocarbon material which may need to be disposed of, is beneficially converted to energy and useful product.

Combustion of halogenated hydrocarbons

Small amounts of acetylene in anhydrous hydrogen chloride can be reduced by heating the gas to a temperature within the range of about 300.degree. C to 500.degree. C in the presence of oxygen, said oxygen being in molar excess to that of the acetylene present. The process converts up to 99+% of the acetylene to vinyl chloride, carbon monoxide, other oxidation and chlorinated products with minimal production of chlorine which is an undesirable by-product.

Method of removing acetylene from anhydrous-hydrogen chloride

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Lake Jackson, TX, United States of America

David E Busby