Process for separating tar from a reaction mixture
AssigneeE. I. Du Pont de Nemours and Company
InventorsRobert Brent Landers, Vijay Kumar Gupta, Vinci Martinez Felix
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Abstract
Disclosed is a process for the separation of tar and non-volatile reagents from a reaction mixture formed when chlorinated carbon compounds are allowed to react with anhydrous hydrogen fluoride in a liquid phase to form fluorinated carbon compounds. The disclosed process leaves tar essentially free of HF and in a form allowing for safe, easy, and economical transfer and disposal.
Claims9
A process for separating tar and non-volatile reagents from hydrogen fluoride and other reaction components of a reaction mixture formed in the production of 1,1-difluoroethane (HFC-152a) wherein hydrogen fluoride and at least one halogenated carbon compound selected from the group consisting of chloroethene, fluoroethene, 1,1-dichloroethane, and 1-chloro-1-fluoroethane (HCFC-151a) are allowed to react in a liquid phase, optionally in the presence of metal halide catalyst and other additives, comprising the steps of:
- (a) removing a liquid phase aliquot from the reaction mixture,
- (b) distilling a first portion of components from the liquid phase aliquot to form a remainder,
- (c) combining with the remainder at least one saturated halogenated hydrocarbon solvent and optionally HF, and
- (d) distilling a second portion of components comprising HF and saturated halogenated hydrocarbon solvent therefrom resulting in a composition comprising saturated halogenated hydrocarbon solvent, tar, and non-volatile reagents.
Dependencies are inferred from the claim text.