Title:
【発明の名称】ハロゲン交換反応用触媒の回収
Document Type and Number:
Japanese Patent JP2002502690
Kind Code:
A
Abstract:
It has been found possible to separate catalytically-active aminophosphonium catalysts from mixtures composed predominately of aminophosphonium catalyst residue(s) and heavy ends from a halogen exchange reaction conducted in an aprotic solvent/diluent by extracting such mixtures with a neutral or acidic aqueous extraction solvent medium. Various ways of isolating from the halogen exchange reaction product mixture a mixture composed predominately of aminophosphonium catalyst residue(s) and heavy ends are described. Halogen exchange processes in which the catalytically-active aminophosphonium catalysts are separated for reuse are also described. Since aminophosphonium catalysts are expensive, the present process technology fulfills a need which has existed for an effective way of recovering such catalysts in catalytically active form enabling reuse of such materials, especially as halogen exchange catalysts.
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Inventors:
Chieng, Chi Hung
Barhoff, Jiyon Ef
Lynn, Ronnie Double
Barhoff, Jiyon Ef
Lynn, Ronnie Double
Application Number:
JP2000530484A
Publication Date:
January 29, 2002
Filing Date:
December 11, 1998
Export Citation:
Assignee:
Albemarle Corporation
International Classes:
B01J31/40; C07B39/00; C07B61/00; C07C17/20; C07C17/38; C07C25/13; C07C45/63; C07C205/12; C07F9/02; C07F9/54; (IPC1-7): B01J31/40; C07C17/20; C07C17/38; C07C25/13
Attorney, Agent or Firm:
Heiyoshi Odashima