	US 12,031,107 B2
	Energy efficient biodiesel production from natural or industrial waste oil
Paul Klingelhoefer, Ludwigshafen (DE); and Michael Schier, Ludwigshafen (DE)
Assigned to BASF SE, Ludwigshafen (DE)
Appl. No. 17/917,514
Filed by BASF SE, Ludwigshafen (DE)
PCT Filed Mar. 30, 2021, PCT No. PCT/EP2021/058362 § 371(c)(1), (2) Date Oct. 6, 2022, PCT Pub. No. WO2021/204610, PCT Pub. Date Oct. 14, 2021.
Claims priority of application No. 20168384 (EP), filed on Apr. 7, 2020.
Prior Publication US 2023/0151299 A1, May 18, 2023
Int. Cl. C11C 3/02 (2006.01); C10L 1/02 (2006.01); C11C 3/10 (2006.01)

CPC C11C 3/02 (2013.01) [C10L 1/026 (2013.01); C11C 3/10 (2013.01); C10L 2200/0476 (2013.01); C10L 2200/0484 (2013.01)]

18 Claims

1. A method of producing fatty acid alkyl ester from an organic oil source comprising at least one free fatty acid, wherein the organic oil source has an acid number of at least 30 mg KOH/g and wherein the method comprises the steps of

a) reacting the oil source with glycerol at a temperature, which is at least 110° C. and does not exceed 180° C. during the reaction, in the presence of a catalyst comprising at least methane sulfonic acid or the homo anhydride thereof;

b) acidic transesterification at a temperature, which is at least 110° C. and does not exceed 160° C. during the reaction of the reaction product from step a) with an alkanol; and

c) isolating the fatty acid alkyl ester from the reaction product of step b).