Catalyst treatment to improve corrosion resistance

Patent metadata

Field	Value
Publication number	US-11878285-B2
Application number	US-201917265968-A
Country	US
Kind code	B2
Filing date	Jul 26, 2019
Priority date	Aug 7, 2018
Publication date	Jan 23, 2024
Grant date	Jan 23, 2024

Abstract

There are provided systems and processes that provide a robust α-alumina supported catalyst for the wet air oxidation or hydrolysis treatment of wastewaters having a pH of 9 or greater.

First claim

The invention claimed is:

1. A wastewater treatment process comprising:
heating an alumina-supported catalyst comprising alumina in a form other than α-alumina and a catalyst deposited thereon at a temperature effective to transform at least a portion of the alumina to its α-alumina form and produce a stabilized α-alumina supported catalyst; and
subjecting a wastewater stream comprising an amount of contaminants and having a pH of 9 or greater to a wet air oxidation or hydrolysis process in the presence of the stabilized α-alumina supported catalyst to reduce an amount of the contaminants in the wastewater stream.

2. The process of claim 1 , wherein the wastewater is subjected to a hydrolysis process.

3. The process of claim 1 , wherein the wastewater is subjected to a wet air oxidation process.

4. A wastewater treatment process comprising:
heating an alumina-supported catalyst comprising alumina in a form other than α-alumina and a catalyst deposited thereon at a temperature effective to transform at least a portion of the alumina to its α-alumina form and produce a stabilized α-alumina supported catalyst; and
subjecting a wastewater stream comprising an amount of contaminants and having a pH of 9 or greater to a wet air oxidation or hydrolysis process in the presence of the stabilized α-alumina supported catalyst to reduce an amount of the contaminants in the wastewater stream, wherein the wastewater stream comprises a wastewater stream from the production of propylene oxide and styrene monomer (POSM).

5. The process of claim 4 , wherein the heating step further comprises heating the alumina-supported catalyst to a temperature greater than 1200° C.

6. The process of claim 5 , wherein the heating step further comprises heating the alumina-supported catalyst to a temperature between 1250° C. and 1350° C.

7. The process of claim 5 , wherein the heating step further comprises heating the alumina-supported catalyst to a temperature between 1200° C. and 1350° C. for at least one hour.

8. The process of claim 1 , wherein the heating step further comprises heating the alumina-supported catalyst to a temperature greater than 1200° C.

9. The process of claim 8 , wherein the heating step further comprises heating the alumina-supported catalyst to a temperature between 1250° C. and 1350° C.

10. The process of claim 8 , wherein the heating step further comprises heating the alumina-supported catalyst to a temperature between 1200° C. and 1350° C. for at least one hour.

11. The process of claim 4 , wherein the contaminants comprise an amount of chemical oxygen demand (COD).

Assignees

• Lummus Technology Inc

Inventors

• Burclaff Philip A
• Bush Dominic
• Kumfer Bryan J

Classifications

• B01J21/04 Primary

  Alumina · CPC title

• B01J23/462

  Ruthenium · CPC title

• B01J37/08

  Heat treatment {(B01J37/0009, B01J37/0018 take precedence)} · CPC title

• C02F1/74

  with air (aeration of stretches of water C02F7/00) · CPC title

• C02F2103/365

  from petrochemical industry (e.g. refineries) · CPC title