US 11,939,531 B2
Alkali-enhanced hydrothermal purification of plastic pyrolysis oils
Ville Paasikallio, Porvoo (FI); Jukka-Pekka Pasanen, Porvoo (FI); and Blanka Toukoniitty, Porvoo (FI)
Assigned to NESTE OYJ, Espoo (FI)
Appl. No. 17/613,812
Filed by Neste Oyj, Espoo (FI)
PCT Filed May 26, 2020, PCT No. PCT/EP2020/064512
§ 371(c)(1), (2) Date Nov. 23, 2021,
PCT Pub. No. WO2020/239729, PCT Pub. Date Dec. 3, 2020.
Claims priority of application No. 20195446 (FI), filed on May 28, 2019.
Prior Publication US 2022/0235276 A1, Jul. 28, 2022
Int. Cl. C10G 1/10 (2006.01); B01D 11/04 (2006.01); C10G 1/00 (2006.01); C10G 1/04 (2006.01); C10G 3/00 (2006.01); C10G 19/02 (2006.01); C10G 31/08 (2006.01); C10L 1/04 (2006.01)
CPC C10G 1/10 (2013.01) [B01D 11/04 (2013.01); C10G 1/002 (2013.01); C10G 1/047 (2013.01); C10G 3/40 (2013.01); C10G 3/50 (2013.01); C10G 19/02 (2013.01); C10G 31/08 (2013.01); C10L 1/04 (2013.01); C10G 2300/1007 (2013.01)] 24 Claims
 
1. A method for preparing fuel components from waste pyrolysis oil (WPO), the method comprising:
a) providing a waste pyrolysis oil, containing as a major part, plastic pyrolysis oil (PPO), tyre pyrolysis oil (TPO), or mixtures thereof, the waste pyrolysis oil including as the major part hydrocarbons, and including impurities formed as:
chlorine compounds, containing from 20 mg/kg chlorine of the WPO to 3500 mg/kg chlorine of the WPO;
nitrogen compounds, containing from 50 mg/kg nitrogen of the WPO to 10,000 mg/kg nitrogen of the WPO;
sulphur compounds, containing from 10 mg/kg sulphur of the WPO to 15,000 mg/kg sulphur of the WPO;
silicon compounds, containing from 20 mg/kg silicon of the WPO to 2000 mg/kg silicon of the WPO;
b) purifying the waste pyrolysis oil by subjecting it to a hydrothermal treatment with water or with water having a pH above 7 at 150-450° C., where an oil to water ratio is from 9:1 to 1:9 (weight/weight);
c) separating the hydrothermally treated waste pyrolysis oil from an aqueous phase;
d) preparing a hydroprocessing feed
consisting essentially of the hydrothermally treated waste pyrolysis oil; or
consisting essentially of a mixture of the hydrothermally treated waste pyrolysis oil and one or more feed(s) selected from a list consisting of oxygen-containing biological oils having less than 50 mg/kg chlorine and less than 1 mg/kg silicon and hydrocarbons having less than 50 mg/kg chlorine and less than 1 mg/kg silicon;
e) hydroprocessing the hydroprocessing feed catalytically with hydrogen to cause hydrogenation, and/or one or more of: hydrodeoxygenation (HDO), hydrodesulfurisation (HDS), hydrodenitrification (HDN), hydrodechlorination (HDCl), hydrodearomatization (HDAr), and hydroisomerisation (HI), at a temperature between 270° C. and 390° C., at a pressure between 2 MPa and 8 MPa, at a WHSV in a range from 0.1 h−1 to 10 h−1, and a H2 flow of 50-2000 nl H2/l feed in a presence of a hydrodeoxygenation catalyst; and
f) recovering from a hydroprocessed product at least one hydrocarbon fraction boiling in a liquid fuel range;
wherein in step b) the hydrothermal treatment is conducted so as to cause at least a 50% reduction of silicon compounds of the WPO.