Process for extracting (chlorinated) hydrocarbon-free hydrogen chloride and phosgene-free (chlorinated) hydrocarbons from a hydrogen chloride stream containing (chlorinated) hydrocarbons and phosgene

US7819949B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Martin Sesing · Waldsee, DE
• Heiner Schelling · Ludwigshafen, DE
• Juergen Ciprian · Ludwigshafen, DE
• Filip Deberdt · Bonheiden, BE
• Martin Karches · Neustadt, DE
• Olga Schubert · Ludwigshafen, DE

Key dates

• Filing date: Jan 25, 2007
• Grant date: Oct 26, 2010
• Expiry date: Nov 9, 2027

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01B7/0718
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

(Chloro)hydrocarbon-free hydrogen chloride and phosgene-free (chloro)hydrocarbons are recovered from a hydrogen chloride stream having (chloro)hydrocarbons and phosgene. The recovery involves connecting a first adsorber and a second adsorber in series and passing the fresh hydrogen chloride stream comprising phosgene and (chloro)hydrocarbons firstly through the first adsorber and subsequently through the second adsorber until essentially no more (chloro)hydrocarbon is adsorbed by the first adsorber, passing the fresh hydrogen chloride stream through the second adsorber while the first adsorber is regenerated, with essentially phosgene-free (chloro)hydrocarbon being obtained in the regeneration, passing the fresh hydrogen chloride stream firstly through the second adsorber and subsequently through the regenerated first adsorber until essentially no more (chloro)hydrocarbon is adsorbed by the second adsorber, and passing the fresh hydrogen chloride stream through the first adsorber while the second adsorber is regenerated, with essentially phosgene-free (chloro)hydrocarbon being obtained in the regeneration.