	US 12,358,872 B2
	Method for producing laurolactam, device for synthesizing same, laurolactam composition produced thereby, and method for producing polylaurolactam using same
Jinho Park, Daejeon (KR); Jiyeon Kim, Daejeon (KR); Hyun Seo, Daejeon (KR); and Namjin Jang, Daejeon (KR)
Assigned to HANWHA SOLUTIONS CORPORATION, Seoul (KR)
Appl. No. 17/782,244
Filed by HANWHA SOLUTIONS CORPORATION, Seoul (KR)
PCT Filed Oct. 27, 2020, PCT No. PCT/KR2020/014732 § 371(c)(1), (2) Date Jun. 3, 2022, PCT Pub. No. WO2021/112407, PCT Pub. Date Jun. 10, 2021.
Claims priority of application No. 10-2019-0161823 (KR), filed on Dec. 6, 2019.
Prior Publication US 2023/0020512 A1, Jan. 19, 2023
Int. Cl. C07D 201/04 (2006.01); C07D 225/02 (2006.01)

CPC C07D 201/04 (2013.01) [C07D 225/02 (2013.01)]

7 Claims

1. A method of preparing laurolactam, the method comprising:

a) synthesizing laurolactam by Beckmann rearrangement of cyclododecanone oxime under a catalyst system,

b) mixing the laurolactam synthesized in a) with a good solvent and removing the catalyst system, and

c) mixing the laurolactam from which the catalyst system has been removed in b) with a poor solvent and performing recrystallization,

wherein in c), the laurolactam is recrystallized using a difference in solubility of laurolactam in the good solvent and the poor solvent,

wherein the good solvent is a c1 to c4 hydrocarbon organic solvent containing one or two or more functional groups selected from the group consisting of a hydroxyl group, an amine group, and a mercapto group, and

wherein the poor solvent is distilled water or deionized water.