	US 12,215,076 B2
	Method for producing limonene and composition containing limonene
Nikolas Bugdahn, Holzminden (DE); Diego Jaime, Holzminden (DE); Bernhard Rußbüldt, Höxter (DE); and Frank Strüver, Hameln (DE)
Assigned to Symrise AG, Holzminden (DE)
Appl. No. 17/800,089
Filed by SYMRISE AG, Holzminden (DE)
PCT Filed Feb. 18, 2020, PCT No. PCT/EP2020/054230 § 371(c)(1), (2) Date Aug. 16, 2022, PCT Pub. No. WO2021/164850, PCT Pub. Date Aug. 26, 2021.
Prior Publication US 2023/0167041 A1, Jun. 1, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. C07C 5/31 (2006.01); B01J 29/70 (2006.01)

CPC C07C 5/31 (2013.01) [B01J 29/7038 (2013.01); C07C 2529/06 (2013.01); C07C 2601/16 (2017.05)]

9 Claims

1. A process for producing limonene from beta-pinene, comprising the steps of:

(a) providing beta-pinene or a beta-pinene-containing starting material;

(b) admixing the starting material with a catalytically active amount of a PSH-3 zeolite to form a reaction mixture;

(c) heating the reaction mixture to a temperature in the range from about 60° C. to about 100° C. in the presence of a solvent which is an ester of acetic acid and aliphatic C1-C4 alcohol to convert beta-pinene to a product containing limonene; and

(d) separating the limonene or a limonene-enriched fraction from the product containing limonene.