	US 12,134,747 B2
	Method for reducing amount of dissolved impurities in a renewable feedstock
Tuula Lehtimaa, Porvoo (FI); Hemanathan Kumar, Porvoo (FI); Annika Malm, Porvoo (FI); Olli Byman, Porvoo (FI); and Ronny Wahlström, Porvoo (FI)
Assigned to NESTE OYJ, Espoo (FI)
Filed by Neste Oyj, Espoo (FI)
Filed on Apr. 7, 2023, as Appl. No. 18/297,210.
Claims priority of application No. 20225300 (FI), filed on Apr. 7, 2022.
Prior Publication US 2023/0323242 A1, Oct. 12, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. C10G 3/00 (2006.01); C11B 3/00 (2006.01); C11B 3/08 (2006.01)

CPC C11B 3/001 (2013.01) [C11B 3/005 (2013.01); C11B 3/08 (2013.01)]

24 Claims

1. A method for reducing an amount of dissolved impurities in an oxygen containing renewable feedstock, the method comprising:

i) providing a first feedstock comprising the oxygen containing renewable feedstock, wherein the oxygen containing renewable feedstock comprises dissolved impurities comprising phosphorus and at least one metal, and obtaining a net elementary charge Q1 based on phosphorus and the at least one metal of the first feedstock;

ii) mixing the first feedstock with an elementary charge balancing component to obtain a feedstock to be treated, wherein the feedstock to be treated has a net elementary charge Qt based on phosphorus and the at least one metal, and the net elementary charge Qt is closer to zero net elementary charge than net elementary charge Q1; and

iii) subjecting the feedstock to be treated to a heat treatment at a temperature of 180-400° C. to form precipitate compounds comprising phosphorus and the at least one metal, and to obtain the treated feedstock; wherein

a net elementary charge Q based on phosphorus and the at least one metal of a feedstock is obtained by equation (I):

Q=(C_P×Q_P)+Σ_i(c_M_{_i}×Q_M_{_i}) (I)

wherein

C_Pis a concentration of dissolved phosphorus in the feedstock in mmol/kg of feedstock,

Q_Pis an elementary charge of dissolved phosphorus in the feedstock,

C_M_{_i}is a concentration of dissolved metal i in the feedstock in mmol/kg of feedstock,

Q_M_{_i}is an elementary charge of the dissolved metal i in the feedstock, and

i is a number of dissolved metals in the feedstock,

such that for Q1, the feedstock is the first feedstock, and for Qt, the feedstock is the feedstock to be treated.