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1. (WO1994014534) TEMPERATURE CONTROL IN DRAFT TUBES FOR CATALYST REJUVENATION

Pub. No.:    WO/1994/014534    International Application No.:    PCT/US1993/012096
Publication Date: Fri Jul 08 01:59:59 CEST 1994 International Filing Date: Sat Dec 11 00:59:59 CET 1993
IPC: B01J 38/10
C07C 1/04
Applicants: EXXON RESEARCH AND ENGINEERING CO.
Inventors: BEHRMANN, William, C.
LeVINESS, Stephen, C.
Title: TEMPERATURE CONTROL IN DRAFT TUBES FOR CATALYST REJUVENATION
Abstract:
Catalyst in a slurry phase reactor is rejuvenated in said reactor using a substantially vertical draft tube fully immersed in the slurry which utilizes a rejuvenating gas injected substantially near the bottom of the substantially vertical draft tube whereby catalyst near the bottom of the slurry phase reactor is drawn up the draft tube and discharged from the top of the draft tube near the top of the slurry phase in said reactor, control over the rejuvenation temperature in the substantially vertical draft tube being achieved by means of insulating the draft tube and/or fitting the draft tube with heating or cooling means.