Process for regenerating a catalyst comprising ruthenium oxide for the oxidation of hydrogen chloride

Patent metadata

Field	Value
Publication number	US-9610567-B2
Application number	US-200913142786-A
Country	US
Kind code	B2
Filing date	Dec 28, 2009
Priority date	Dec 30, 2008
Publication date	Apr 4, 2017
Grant date	Apr 4, 2017

Abstract

The invention relates to a process for regenerating a hydrogen chloride oxidation catalyst comprising ruthenium oxide on a support material, which comprises the steps
a) reduction of the catalyst in a gas stream comprising hydrogen chloride and optionally an inert gas at a temperature of from 100 to 800° C., b) recalcination of the catalyst in an oxygen-comprising gas stream at a temperature of from 150 to 800° C.

First claim

The invention claimed is:

1. A process for the catalytic oxidation of hydrogen chloride, comprising
i) introducing a stream comprising hydrogen chloride and an oxygen-comprising stream into an oxidation reactor comprising a hydrogen chloride oxidation catalyst comprising ruthenium oxide on a support material and oxidation of hydrogen chloride to chlorine over the catalyst until the catalyst has a reduced activity
ii) regenerating the catalyst comprising
a) reducing the catalyst in a gas stream consisting of hydrogen chloride and optionally an inert gas at a temperature of from 380 to 430° C., wherein the hourly gas throughput is from 0.1 to 1 kg of gas per kg of catalyst,
b) recalcinating the catalyst in an oxygen-comprising gas stream at a temperature of from 330 to 450° C., wherein the hourly gas throughput is from 0.1 to 1 kg of gas per kg of catalyst,

iii) continuing oxidizing hydrogen chloride to chlorine according to step i) over the regenerated catalyst obtained in ii);
and wherein i)-iii) are carried out in the same reactor.

2. The process according to claim 1 , wherein the gas stream comprising hydrogen chloride comprises from 10 to 100% by volume of hydrogen chloride.

3. The process according to claim 2 , wherein the gas stream comprising hydrogen chloride comprises nitrogen as inert gas.

4. The process according to claim 1 , wherein the oxygen-comprising gas stream comprises from 1 to 100% by volume of oxygen.

5. The process according to claim 1 , wherein the catalyst comprises ruthenium oxide on a support material selected from the group consisting of oxides of aluminum, silicon and titanium.

6. The process according to claim 5 , wherein the support material is alpha-aluminum oxide.

7. The process according to claim 1 , wherein the process is carried out in a fluidized-bed reactor.

8. A process for regenerating a hydrogen chloride oxidation catalyst comprising ruthenium oxide on a support material of alpha-alumina, said process comprises
a) reducing the catalyst in a gas stream consisting of hydrogen chloride and optionally an inert gas at a temperature of from 380 to 430° C., wherein the hourly gas throughput is from 0.1 to 1 kg of gas per kg of catalyst,
b) recalcinating the catalyst in a gas stream composed of oxygen and optionally an inert gas at a temperature of from 330 to 450° C., wherein the hourly gas throughput is from 0.1 to 1 kg of gas per kg of catalyst,
wherein a) and b) are carried out in direct succession.

Assignees

• Henze Guido
• Urtel Heiko
• Sesing Martin
• Karches Martin
• Von Fehren Thorsten
• Kustura Toni
• Basf Se

Inventors

• Henze Guido
• Urtel Heiko
• Sesing Martin
• Karches Martin
• Von Fehren Thorsten
• Kustura Toni

Classifications

• B01J21/04

  Alumina · CPC title

• B01J38/30

  in gaseous suspension, e.g. fluidised bed · CPC title

• B01J21/063

  Titanium; Oxides or hydroxides thereof · CPC title

• Y02P20/584

  Recycling of catalysts · CPC title

• B01J23/462 Primary

  Ruthenium · CPC title