Regeneration method of solid catalyst

Patent metadata

Field	Value
Publication number	US-11273434-B2
Application number	US-201715726897-A
Country	US
Kind code	B2
Filing date	Oct 6, 2017
Priority date	Oct 6, 2017
Publication date	Mar 15, 2022
Grant date	Mar 15, 2022

Abstract

The present invention aims to provide a regeneration method capable of sufficiently restoring the catalytic performance of a solid catalyst used in a dehydration reaction of lactic acid and derivatives thereof. The present invention relates to a method for regenerating a solid catalyst used in a dehydration reaction of lactic acid and derivatives of lactic acid, the method including a contacting step of bringing a solid catalyst containing a component that forms a molten salt in the presence of steam into contact with oxygen and steam under pressure.

First claim

The invention claimed is:

1. A method comprising a contacting step of bringing a solid catalyst containing a component that forms a molten salt in the presence of steam into contact with oxygen and steam,
wherein the steam in the contacting step has a partial pressure of 0.3 to 10 MPa.

2. The method according to claim 1 ,
wherein the component that forms a molten salt contains a condensed phosphate.

3. The method according to claim 1 ,
wherein the contacting step is performed at 200° C. to 700° C.

4. The method according to claim 2 ,
wherein the contacting step is performed at 200° C. to 700° C.

5. The method according to claim 2 ,
wherein the condensed phosphate is a mixture of an alkali metal salt and an alkaline-earth metal salt.

6. The method according to claim 2 ,
wherein the condensed phosphate is at least one compound selected from the group consisting of Na 4 P 2 O 7 , Na 2 H 2 P 2 O 7 , (NaPO 3 ) n , K 4 P 2 O 7 , K 2 H 2 P 2 O 7 , (KPO 3 ) n , Ca 2 P 2 O 7 , CaH 2 P 2 O 7 , Ca(PO 3 ) 2 , Ca 3 (PO 4 ) 2 , Ba 2 P 2 O 7 , BaH 2 P 2 O 7 , Ba(PO 3 ) 2 , Ca 2-x-s K 2x H 2s P 2 O 7 and Ba 2-x-s K 2x H 2s P 2 O 7 ,
wherein n is a positive integer, x and s are each 0 or more and less than 0.5.

7. The method according to claim 2 ,
wherein the condensed phosphate is at least one compound selected from the group consisting of K 4 P 2 O 7 , K 2 H 2 P 2 O 7 , (KPO 3 ) n , Ba 2 P 2 O 7 , BaH 2 P 2 O 7 , Ba(PO 3 ) 2 and Ba 2-x-s K 2x H 2s P 2 O 7 ,
wherein n is a positive integer, x and s are each 0 or more and less than 0.5.

8. The method according to claim 2 ,
wherein the condensed phosphate is at least one compound selected from the group consisting of Ba 2 P 2 O 7 , (KPO 3 ) n and Ba 2-x-s K 2x H 2s P 2 O 7 ,
wherein n is a positive integer, x and s are each 0 or more and less than 0.5.

9. The method according to claim 2 ,
wherein the condensed phosphate is a mixture of Ba 2 P 2 O 7 and (KPO 3 ) n .

10. The method according to claim 2 ,
wherein when a mixture of an alkali metal salt and an alkaline-earth metal salt is used as the condensed phosphate, the molar ratio of the alkali metal to the alkaline-earth metal (alkali metal/alkaline-earth metal) is 0.5 to 2.0.

11. The method according to claim 1 ,
wherein the solid catalyst is supported on a carrier, and
wherein the carrier is at least one selected from the group consisting of silica, diatomite, alumina, silica alumina, silica magnesia, zirconia, titania, magnesia, niobia, ceria, zeolite, silicon carbide and carbide.

12. The method according to claim 1 ,
wherein the steam in the contacting step has a partial pressure of 0.3 to 5.0 MPa.

13. The method according to claim 1 ,
wherein the steam in the contacting step has a partial pressure of 0.3 to 1.0 MPa.

14. The method according to claim 1 ,
wherein the oxygen partial pressure is more than 0 MPa and not more than 1.0 MPa.

15. The method according to claim 1 ,
wherein the oxygen concentration in the gas component other than steam in the contacting step is 50% by volume or less.

16. The method according to claim 1 ,
wherein the amount of the steam in the contacting step relative to 100% by volume of oxygen is 1% to 100000% by volume.

17. The method according to claim 1 ,
wherein the contacting step is performed at 250° C. to 650° C.

18. The method according to claim 1 ,
wherein the contacting step is performed at 300° C. to 600° C.

Assignees

• Procter & Gamble
• Nippon Catalytic Chem Ind

Inventors

• Velasquez Juan Estaban
• Collias Dimitris Ioannis
• Godlewski Jane Ellen
• Imada Motosuke
• Shingubara Koji
• Tonoya Masashi
• Kanbara Shinji
• Okada Masaki
• Oku Tomoharu
• Tsuneki Hideaki
• Nonoguchi Masanori

Classifications

• B01J38/02

  Heat treatment · CPC title

• B01J27/285 Primary

  of catalysts comprising compounds of phosphorus · CPC title

• B01J38/16 Primary

  Oxidation gas comprising essentially steam and oxygen · CPC title

• C07C51/377

  by splitting-off hydrogen or functional groups; by hydrogenolysis of functional groups {(C07C51/36 - C07C51/373 take precedence)} · CPC title

• B01J38/06

  using steam · CPC title