Process for purifying renewable feedstock comprising triglycerides

Patent metadata

Field	Value
Publication number	US-10815430-B2
Application number	US-201916713233-A
Country	US
Kind code	B2
Filing date	Dec 13, 2019
Priority date	Dec 14, 2018
Publication date	Oct 27, 2020
Grant date	Oct 27, 2020

Abstract

The present invention relates to a process for purifying renewable feedstock comprising triglycerides, said process comprising the steps, where the renewable feedstock comprising triglycerides, comprising at least one plant oil originating from a plant of the family Brassicaceae, is treated with an aqueous medium to obtain a mixture, and a first stream comprising water and a second stream comprising triglycerides are separated from said mixture, and the second stream is obtained as purified renewable feedstock.

First claim

The invention claimed is:

1. A process for purifying renewable feedstock comprising triglycerides, where said process comprises the steps, where the renewable feedstock comprising triglycerides comprises at least one plant oil originating from a plant of the family Brassicaceae, and said renewable feedstock comprising triglycerides is treated with an aqueous medium, at a temperature from 140 to 195° C., under a pressure from 0.1 to 70 bar (abs), and where the ratio of the feedstock comprising triglycerides to the aqueous medium is from 1:5 to 5:1, respectively, to obtain a mixture, and a first stream comprising water and a second stream comprising triglycerides are separated from said mixture, and the second stream is obtained as purified renewable feedstock.

2. The process according to claim 1 , wherein the plant of the family Brassicaceae is selected from Brassica juncea, Brassica carinata, Brassica nigra, Brassica rapa, Brassica rapa subsp. oleifera, Brassica elongate, Brassica nariosa, Brassica rupestris, Brassica tournefortii, Brassica napus, Brassica napus el, Sinapis hirta, Sinapis alba, Sinapis arvensis, Nasturtium floridanum, Nasturtium gambellium, Nasturtium gronlandicum, Nasturtium microfullum, Nasturtium officinale, Nasturtium sordidum and combinations thereof.

3. The process according to claim 1 , wherein the purified renewable feedstock comprises not more than 50 mg/kg phosphorus, phosphorus, calculated as elemental phosphorus.

4. The process according to claim 1 , wherein the purified renewable feedstock comprises not more than 50 mg/kg alkali metals, alkaline earth metals, metals of the groups VIIB and VIIIB of the Periodic table of elements, or combinations thereof, calculated as elemental metals.

5. The process according to claim 1 , wherein the first stream comprising water comprises not more than 2000 mg/kg total organic carbon.

6. The process according to claim 1 , wherein the purified renewable feedstock comprises not more than 50 mg/kg phosphorus and not more than 50 ppm alkali metals, alkaline earth metals, metals of the groups VIIB and VIIIB of the Periodic table of elements, or combinations thereof and the first stream comprising water comprises not more than 2000 mg/kg total organic carbon.

7. The process according to claim 1 , wherein the aqueous medium comprises 0.01 to 3 wt % of an acid selected from sulfuric acid and C1-C10 organic acids, calculated on the total feed.

8. The process according to claim 7 , wherein the C1-C10 organic acid is EDTA or C1-C6 organic acid selected from citric acid, formic acid, oxalic acid, acetic acid, butyric acid, valeric acid, caproic acid and propionic acid.

9. The process according to claim 7 , wherein the acid is sulphuric acid.

10. The process according to claim 1 , wherein the renewable feedstock comprising triglycerides comprises less than 50 wt % of at least one other renewable feedstock.

11. The process according to claim 10 , wherein the other renewable feedstock is selected from the group consisting of feedstock is selected from the group consisting of plant oils, excluding plant oils originating from a plant of the family Bras sicaceae, animal fats, fish oils, algae oils, low cost waste materials, side streams, by-products, refining waste and residues and sewage sludge, fatty acid distillates from physical refining of plant oils or animal fats, acid oils, distillers corn oil from ethanol production, crude tall oil, waste cooking oils, lard, brown grease, trap grease, waste fats, low-grade oils, super critical water liquefaction oils, pyrolysis oils, plant oils, and any combinations thereof.

12. The process according to claim 1 wherein the aqueous medium is selected from water, mixtures of water and steam, and mixtures of streams comprising water or water and steam, with water soluble and/or water miscible organic compounds.

13. The process according to claim 1 , wherein the aqueous medium comprises not more than 3 wt % of organic compounds.

14. The process according to claim 1 , wherein the temperature is from 140 to 190° C.

15. The process according to claim 1 , wherein the pressure is from 1 to 60 bar (abs).

16. The process according to claim 1 , wherein the residence time is from 10 min to 12 hours.

17. The process according to claim 1 , wherein the pH of the first stream is in the range from 0 to 6.5.

18. The process according to claim 1 , wherein at least part of the first stream is recirculated to the aqueous medium.

19. The process according to claim 1 , wherein the carbon yield is at least 99%.

20. The process according to claim 1 , wherein the plant of the family Brassicaceae is Brassica carinata.

21. The process according to claim 1 , wherein the purified renewable feedstock comprises not more than 10 mg/kg phosphorus, calculated as elemental phosphorus.

22. The process according to claim 1 , wherein the purified renewable feedstock comprises not more than 10 mg/kg alkali metals, alkaline earth metals, metals of the groups VIIB and VIIIB of the Periodic table of elements, or combinations thereof, calculated as elemental metals.

23. The process according to claim 1 , wherein the temperature is from 145 to 185° C.

24. The process according to claim 1 , wherein the residence time is from 15 min to 3 hours.

25. The process according to claim 1 , wherein the pH of the first stream is in the range from 0.1 to 4.

26. The process according to claim 1 , wherein the carbon yield is at least 99.5%.

Assignees

• Upm Kymmene Corp

Inventors

• Gutierrez Andrea
• Björklöf Thomas

Classifications

• C10G2400/04

  Diesel oil · CPC title

• C11B3/006

  by extraction · CPC title

• C11B13/00

  Recovery of fats, fatty oils or fatty acids from waste materials · CPC title

• C11B1/10

  by extracting · CPC title

• C11B3/04 Primary

  with acids · CPC title