Blown and stripped plant-based oils

Patent metadata

Field	Value
Publication number	US-9556398-B2
Application number	US-201514936181-A
Country	US
Kind code	B2
Filing date	Nov 9, 2015
Priority date	May 21, 2010
Publication date	Jan 31, 2017
Grant date	Jan 31, 2017

Abstract

A method for producing a high viscosity, low volatiles blown stripped plant-based oil is provided. The method may include the steps of: (i) obtaining a plant-based oil; (ii) heating the oil to at least 90C; (iii) passing air through the heated oil to produce a blown oil having a viscosity of at least 200 cSt at 40C; (iv) stripping the blown oil from step (iii) to reduce an acid value of the blown oil to from 5 mg KOH/g to about 9 mg KOH/g; (v) adding a polyol to the stripped oil from (iv), and (vi) stripping the oil from step (v) to reduce the acid value of the oil to less than 5.0 mg KOH/g or less.

First claim

What is claimed is:

1. A method for producing a high viscosity, low volatiles blown stripped plant-based oil, the method comprising the steps of:
(a) obtaining a plant-based oil;
(b) heating the oil to at least 90° C.;
(c) passing air through the heated oil to produce a blown oil having a viscosity of at least 200 cSt at 40° C.;
(d) stripping the blown oil from step (c) to reduce an acid value of the blown oil to from 5 mg KOH/g to about 9 mg KOH/g; and
(e) adding a polyol to the stripped oil from (d); and
(f) stripping the oil from step (e) to reduce the acid value of the oil to less than 5.0 mg KOH/g or less.

2. The method of claim 1 , wherein the oil resulting from step (f) exhibits a viscosity at 40° C. of at least 60 cSt.

3. The method of claim 1 wherein the oil resulting from step (f) exhibits a viscosity at 40° C. of at least 150 cSt.

4. The method of claim 1 , wherein the oil resulting from step (f) exhibits:
a viscosity at 40° C. of at least 500 cSt; an acid value of 4 mg KOH/gram or less; a hydroxyl number of less than 50 mg KOH/gram; and a flash point of at least 293° C., in particular aspects, a flash point of at least 296° C.

5. The method of claim 1 , wherein the oil resulting from step (f) exhibits:
a viscosity at 40° C. of at least 700 cSt; an acid value of 3.5 mg KOH/gram or less; a hydroxyl number of less than about 40 mg KOH/gram; and a flash point of at least 304° C.

6. The method of claim 1 , wherein the oil resulting from step (f) exhibits:
a viscosity at 40° C. of at least 730 cSt; an acid value of 3.0 mg KOH/gram or less; a flash point of at least 315° C.; and a hydroxyl number of less than 30 mg KOH/mg.

7. The method of claim 5 , wherein the oil resulting from step (f) exhibits a flash point of at least 320° C.

8. The method of claim 5 , wherein the oil resulting from step (f) exhibits an acid value of 2.8 mg KOH/gram or less.

9. The method of claim 1 , wherein a catalyst comprising a peroxide or a metal selected from the groups consisting of Transition Elements and Group IV is added to the oil prior to or during step (c).

10. The method of claim 1 , wherein a catalyst is added to the oil prior to or during step (c), the catalyst comprising a metal selected from the group consisting of: tin, cobalt, iron, zirconium, titanium, and combinations thereof.

11. The method of claim 1 , wherein the polyol added comprises glycerin, and sufficient glycerin is added to obtain a molar ratio of added hydroxyl group to fatty acid groups present in the oil resulting from step (d) is from about 1:5 to less than about 1:1, in particular aspects, from about 2:5 to about 8:10.

12. The method of claim 1 , wherein the plant-based oil of step (a) is selected from the group consisting of: soybean oil, sunflower oil, safflower oil, canola oil, rapeseed oil, cottonseed oil, corn oil, corn stillage oil and mixtures thereof.

13. The method of claim 1 , wherein the plant-based oil of step (a) comprises corn stillage oil having an initial acid value from about 12 to about 34 mg KOH/gram, preferably from about 16 to about 32 mg KOH/gram.

Assignees

• Cargill Inc

Inventors

• Hora Michael John
• Murphy Patrick Thomas

Classifications

• C11B3/14 Primary

  with the use of indifferent gases or vapours, e.g. steam · CPC title

• C10M101/04

  Fatty oil fractions · CPC title

• C10M177/00 Primary

  Special methods of preparation of lubricating compositions; Chemical modification by after-treatment of components or of the whole of a lubricating composition, not covered by other classes · CPC title

• C11B3/006

  by extraction · CPC title

• C11C3/02

  by esterification of fatty acids with glycerol · CPC title