Patent · US Expired

Purification by hydrogenation of hydrogen chloride containing acetylene obtained by the thermal cracking of 1,2-dichloroethane

US4388278A · kind A · utility

4Cited by

4References

5Claims

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Assignee

Wacker Chemie AG · DE

Inventors

Ludwig Schmidhammer · Haiming, DE
Gerhard Dummer · Altötting, DE
Rudolf Straszer · Burghausen, DE

Key dates

Filing date	Oct 29, 1981
Grant date	Jun 14, 1983
Priority date	—
Expiry date	Oct 29, 2001

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC01B7/0706
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

The invention is a process for the purification of hydrogen chloride formed during the thermal cracking of 1,2-dichloroethane, by hydrogenating the acetylene impurities with excess hydrogen, at pressures of from 8 to 20 bar absolute and at temperatures of from 120.degree. to 180.degree. C., using platinum or palladium supported catalysts, wherein, according to the invention, carrier materials having a specific surface area of not more than 5 m.sup.2 /g are used, the hydrogen excess used is a function of the acetylene content, the gas mixture, after reaching a temperature of approximately 70.degree. C., is permitted a dwell time of not more than 0.8 second before it enters the catalyst, and the temperature, pressure and volume flow rates are dependent on one another within narrow limits. The purified hydrogen chloride is used for oxychlorination.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.