A method for reducing amount of dissolved impurities in a renewable feedstock

Patent metadata

Field	Value
Publication number	US-2025230380-A1
Application number	US-202318853696-A
Country	US
Kind code	A1
Filing date	Apr 5, 2023
Priority date	Apr 7, 2022
Publication date	Jul 17, 2025
Grant date	—

Abstract

The present invention relates to a method for reducing an amount of dissolved impurities in an oxygen containing renewable feedstock, the dissolved impurities being selected from impurities comprising phosphorus and impurities comprising at least one metal. The method comprises obtaining a net elementary charge of a first feedstock; mixing the first feedstock with an elementary charge balancing component to obtain the feedstock to be treated, whereby the feedstock to be treated has a net elementary charge which is closer to zero net elementary charge than the net elementary charge of the first feedstock; and subjecting the feedstock to be treated to a heat treatment at a temperature of 180-400° C. in order to precipitate compounds containing said phosphorus and said at least one metal.

First claim

1 . A method for reducing an amount of dissolved impurities in an oxygen containing renewable feedstock, the dissolved impurities being selected from impurities comprising phosphorus and impurities comprising at least one metal, the method comprising
a) obtaining a net elementary charge Q1 based on phosphorus and the at least one metal in a first feedstock; b) mixing the first feedstock with an elementary charge balancing component to obtain the feedstock to be treated, whereby the feedstock to be treated has a net elementary charge Qt based on phosphorus and the at least one metal which is closer to zero net elementary charge than the net elementary charge Q1 based on phosphorus and the at least one metal in the first feedstock; and c) subjecting the feedstock to be treated to a heat treatment at a temperature of 180-400° C. in order to precipitate compounds containing said phosphorus and said at least one metal, to obtain the treated feedstock.

2 . The method according to claim 1 , further comprising a step d), removing the formed precipitate compounds from the treated feedstock to obtain an at least partially purified feedstock.

3 . The method according to claim 1 , wherein the elementary charge balancing component is a second feedstock having a net elementary charge Q2 based on phosphorus and the at least one metal that is electrically opposite to the net elementary charge Q1 based on phosphorus and the at least one metal in the first feedstock.

4 . The method according to claim 1 , wherein the net elementary charge Q based on phosphorus and the at least one metal is obtained by equation (I)

Q
=

(

C
P

×

Q
P

)

+

∑

i

⁢

(

C

M
i

×

Q

M
i

)

(
I
)

wherein
C P is the concentration of dissolved phosphorus in the feedstock in mmol/kg of feedstock,
Q P is the elementary charge of dissolved phosphorus in the feedstock,
C M i is the concentration of dissolved metal i in the feedstock in mmol/kg of feedstock,
Q M i is the elementary charge of the dissolved metal i in the feedstock, and
i is the number of dissolved metals taken into account.

5 . The method of claim 4 , wherein dissolved metals present in an amount of at least 1 ppm by weight are taken into account in formula (I).

6 . The method of claim 4 , wherein the dissolved metal is selected from sodium, potassium, magnesium, calcium, iron, and mixtures thereof.

7 . The method according to claim 1 , wherein the elementary charge balancing component is selected from metal containing compounds capable of providing metal cations and phosphorus containing compounds capable of providing phosphorus containing anions.

8 . The method according to claim 7 , wherein the elementary charge balancing component is selected from sodium hydroxide, sodium soap, potassium hydroxide, potassium soap, calcium hydroxide, calcium soap, magnesium hydroxide, magnesium soap, iron hydroxide, iron soap, and mixtures thereof, and from phosphoric acid, a phospholipid, and mixtures thereof.

9 . The method according to claim 1 , wherein the heat treatment is carried out at temperature 180-310° C.

10 . The method according to claim 9 , wherein the heat treatment is carried out at temperature 200-290° C.

11 . The method according to claim 1 , wherein the purification heat treatment is carried out in the presence of water, in an amount of at most 1 wt-%.

12 . The method according to claim 1 , wherein the heat treatment is carried out for a period of time of 1 minute to 3 hours, preferably 15 minutes to 3 hours.

13 . The method according to claim 2 , wherein the removal of the formed precipitate compounds in step d) is carried out by at least one method selected from filtration, settling, centrifugation, water washing, degumming and bleaching.

14 . The method according to claim 13 , wherein said removal is carried out by degumming with an acid and/or water, followed by centrifugation.

15 . The method according to claim 13 , wherein said removal is carried out by bleaching in the presence of an acid and an adsorbent.

16 . The method according to claim 1 , wherein the first feedstock and the optional second feedstock comprises at least one of animal fat, animal oil, plant fat, plant oil, fish fat, fish oil, microbial oil, algae oil, waste fat, waste oil, residue fat, residue oil, a sludge originating from plant oil production.

17 . The method according to claim 16 , wherein the first feedstock and the optional second feedstock comprises at least one of acidulated soapstock, poultry fat, dry rendered poultry fat, brown grease, used cooking oil, tall oil, fraction of tall oil, crude tall oil, tall oil pitch, palm oil effluent sludge, crude palm oil, palm oil, palm seed oil, palm fatty acid distillate, babassu oil, carinata oil, coconut butter, muscat butter oil, sesame oil, maize oil, poppy seed oil, cottonseed oil, soy oil, laurel seed oil, jatropha oil, palm kernel oil, camelina oil, archaeal oil, bacterial oil, fungal oil, protozoal oil, algal oil, seaweed oil, mustard seed oil, oils from halophiles, soybean oil, technical corn oil, rapeseed oil, colza oil, canola oil, sunflower oil, hemp seed oil, olive oil, linseed oil, mustard oil, peanut oil, castor oil, coconut oil, lard, tallow, train oil, spent bleaching earth oil, lignocellulosic based feeds, or mixtures thereof.

18 . Use of a feedstock treated with a method according to claim 1 for further processing, the use comprising a processing step after step c) or optional step d), selected from a group comprising hydrolysis, transesterification, deodorisation, metathesis, gasification, hydrotreatment, synthetic gas upgrading, and co-processing in fossil refining processes.

19 . Use of a feedstock treated with a method according to claim 1 , in the manufacturi

Assignees

• Neste Oyj

Inventors

• Lehtimaa Tuula
• Kumar Hemanathan
• Malm Annika
• Byman Olli
• Wahlström Ronny

Classifications

• C11B3/08

  with oxidising agents · CPC title

• C11B3/005

  by wave energy or electric current, e.g. electrodialysis · CPC title

• C10G45/72

  Controlling or regulating · CPC title

• C10G3/50 Primary

  in the presence of hydrogen, hydrogen donors or hydrogen generating compounds · CPC title

• C11B3/001 Primary

  by a combination of two or more of the means hereafter · CPC title