Dewaxing process
AssigneeThe British Petroleum Company p.l.c.
InventorFerdinand Richter
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Abstract
Halogenated hydrocarbon and uncontaminated water is recovered from a stream of process water contaminated with halogenated hydrocarbon and hydrogen halide. The process water is neutralized and then distilled to obtain a first fraction containing halogenated hydrocarbon and water and a second fraction containing uncontaminated water. The first fraction is allowed to settle into layers of halogenated hydrocarbon and water which are then removed. The contaminated stream may be obtained from a process for the solvent dewaxing of a petroleum fraction.
Claims6
A process for the dewaxing of an oil fraction which process comprises the steps of contacting the mixture with a halogenated hydrocarbon to obtain one fraction relatively free from halogenated hydrocarbon and one fraction associated with halogenated hydrocarbon and recovering halogenated hydrocarbon from the fraction associated therewith by a recovery system involving the use of steam whereby a contaminated stream of process water containing halogenated hydrocarbon and hydrogen halide is formed, neutralizing said process water stream by treatment with an alkali metal hydroxide, carbonate or hydrogen carbonate, or an ion exchanger, distilling the treated stream to obtain a first fraction containing halogenated hydrocarbon and water, allowing the first fraction to settle into layers of halogenated hydrocarbon and water and recycling the layer of halogenated hydrocarbon to the contacting stage upstream of the neutralization of the process water stream.
Dependencies are inferred from the claim text.