Granted Patent B2

US 12,370,477 · App. 18/633,993 · Granted Jul 29, 2025

Inventors: Thomas Persson (Sandviken, SE); Tomas Östberg (Frösön, SE); Fred Sundström (Stockholm, SE)

Assignee: SKF RECONDOIL AB

B01D37/02B01D17/0202B01D37/04B01D39/18C10M175/0016C10M175/0058B01D2201/182B01D2239/0407C10N2070/00

Abstract

Claims (26)

1. A method for purifying a contaminated oil, comprising:

mixing a liquid composition that is at least substantially insoluble in oil with the contaminated oil to form a two-phase mixture containing an oil phase and a polar phase, whereby the polar phase absorbs contaminating solids and/or dissolved impurities in the contaminated oil, and

separating the oil phase of the two-phase mixture from the polar phase;

wherein the liquid composition comprises a polar polymer, a surface active hydrotrope/solubilizer, and a co-tenside.

2. The method according to claim 1 , wherein the polar polymer comprises a polyalkylene glycol.

3. The method according to claim 1 , wherein the polar polymer comprises a polyethylene glycol or a polypropylene glycol.

4. The method according to claim 1 , wherein the polar polymer comprises a polyethylene glycol.

5. The method according to claim 4 , wherein the polyethylene glycol has an average molecular weight of 190-210 g/mole.

6. The method according to claim 1 , wherein the surface active hydrotrope/solubilizer comprises an anionic sulfonic acid, a phosphate ester or a non-ionic poly-glycoside surfactant.

7. The method according to claim 6 , wherein the polar polymer comprises a polyalkylene glycol.

8. The method according to claim 6 , wherein the polar polymer comprises a polyethylene glycol.

9. The method according to claim 8 , wherein the polyethylene glycol has an average molecular weight of 190-210 g/mole.

10. The method according to claim 9 , wherein the at least one amphoteric co-surfactant comprises sodium caprylimino dipropionate.

11. A liquid composition comprising a polar polymer, a surface active hydrotrope/solubilizer, and sodium caprylimino dipropionate.

12. The liquid composition according to claim 11 , wherein the surface active hydrotrope/solubilizer comprises an anionic sulfonic acid, a phosphate ester or a non-ionic poly-glycoside surfactant.

13. A method for purifying a contaminated oil, comprising:

mixing a liquid composition with the contaminated oil to form a two-phase mixture containing an oil phase and a polar phase, and

filtering the two-phase mixture such that the oil phase passes through a filter and the polar phase and contaminants are retained in the filter;

wherein the liquid composition comprises a polar polymer, a surface active hydrotrope/solubilizer, and a co-tenside.

14. The method according to claim 13 , wherein the filter is a filter cake.

15. The method according to claim 14 , wherein the cake filter is composed of a polar filter material.

16. The method according to claim 15 , wherein the cake filter is composed of cellulose fiber.

17. The method according to claim 16 , wherein the polar polymer comprises a polyalkylene glycol.

18. The method according to claim 17 , wherein the surface active hydrotrope/solubilizer comprises an anionic sulfonic acid, a phosphate ester or a non-ionic poly-glycoside surfactant.

19. The method according to claim 18 , wherein the polyalkylene glycol has an average molecular weight of 190-210 g/mole.

20. The method according to claim 19 , wherein the co-tenside comprises sodium caprylimino dipropionate.

Priority Claims (1)

Continuity (2)

References Cited (129)