Process for removing carbonaceous deposits on surfaces of catalysts and plant parts

US8349090B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Manfred Winter · Dittelsheim-Heßloch, DE
• Hagen Weigl · Ladenburg, DE
• Andreas Kramer · Zürich, CH

Key dates

• Filing date: Oct 9, 2009
• Grant date: Jan 8, 2013
• Expiry date: Oct 9, 2029

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J38/20
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A process for removing carbonaceous deposits on surfaces of catalysts and plant parts by treating the deposits with a superheated stream of steam admixed at least temporarily with an oxygenous gas is provided, which involves, in each case monitoring the offgas CO2 content after condensation of the steam, at a temperature of at least 300° C.: (a) treating the carbonaceous deposits with superheated steam at a temperature of at least 300° C. until the CO2 content of the offgas has exceeded a maximum; (b) then, with further supply of superheated steam, commencing oxygen supply, the amount of oxygen supplied being adjusted such that the CO2 content in the offgas decreases further until it has fallen to a value of <1% by volume; and then (c) ending the supply of superheated steam and passing an oxygenous gas over remaining amounts of carbonaceous deposits until the deposits have been virtually removed.