Recovery of hydrogen chloride from chlorinated hydrocarbons such

Refrigeration – Processes – Circulating external gas

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62 23, 260652P, 423240, F25J 302, F25J 306, C07C 1900, C01B 700

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040100170

ABSTRACT:
High purity hydrogen chloride is recovered from a gaseous product stream consisting essentially of hydrogen chloride and at least one chlorinated hydrocarbon of from one to two carbon atoms, such as the chloromethanes, by a process which has significantly lowered refrigeration requirements, thus resulting in savings of energy and materials. The process involves (a) condensing essentially all of the gaseous stream to form a liquid phase feed stream wherein the liquid phase consists essentially of the hydrogen chloride and the chlorinated hydrocarbon(s); (b) passing the condensed liquid phase feed stream to a stripping zone; (c) maintaining the stripping zone at a pressure and temperature profile sufficient to retain essentially all of the chlorinated hydrocarbon(s) in a liquid phase and to allow essentially all of the hydrogen chloride to separate in a vapor phase; (d) removing a first recovery stream consisting of the high purity hydrogen chloride vapor phase from the stripping zone; and (e) removing a second recovery stream consisting of the chlorinated hydrocarbon(s) liquid phase from the stripping zone. In a preferred embodiment the gaseous product stream is from a methyl chloride thermal chlorinator and consists essentially of hydrogen chloride and a chloromethane mixture, this gaseous product stream is completely condensed and cooled to a temperature between about -30.degree. C and about -10.degree. C and then fed to the stripping zone which is maintained at a pressure between about 200 psia and about 250 psia.

REFERENCES:
patent: 2472610 (1949-06-01), Nixon et al.
patent: 2490454 (1949-12-01), Myers
patent: 3260059 (1966-07-01), Rosenberg et al.

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