公开(公告)号：US11970441B2

公开(公告)日：2024-04-30

申请号：US16977107

申请日：2018-12-07

Applicant: CENTRAL SOUTH UNIVERSITY

Inventor： Hong Zhong ,  Xiaoping Huang ,  Shuai Wang ,  Zhanfang Cao

IPC: C07C333/04 ,  B03D1/012 ,  C07C329/14

CPC classification number: C07C333/04 ,  B03D1/012 ,  C07C329/14 ,  B03D2201/02 ,  B03D2203/02

Abstract: The invention belongs to the field of mineral flotation collector materials, and particularly discloses a method for preparing thionocarbamate. In the preparation process, xanthate and 2-haloethanol are esterified to obtain O-alkyl-S-hydroxyethyl xanthate, and then O-alkyl-S-hydroxyethyl xanthate and fatty amine are reacted to obtain a mixture of thionocarbamate and 2-mercaptoethanol. The mixture of thionocarbamate and 2-mercaptoethanol is washed with alkali, and the oil phase and water phase are separated. The oil phase and water phase are thionocarbamate and 2-hydroxyethylthiolate, respectively, and 2-mercaptoethanol is obtained by washing with an acid. 2-alkylthioethanol is obtained by reacting 2-hydroxyethanethiolate with alkyl halide, and then with carbon disulfide and alkali to prepare O-alkylthioethyl xanthate. Thionocarbamate, 2-mercaptoethanol and O-alkylthioethyl xanthate prepared by this method possess high yield and high purity. The process is green and environmentally friendly, and is beneficial to the industrialization of co-production.

公开(公告)号：US12054452B2

公开(公告)日：2024-08-06

申请号：US17005324

申请日：2020-08-28

Applicant: CENTRAL SOUTH UNIVERSITY

Inventor： Hong Zhong ,  Xin Ma ,  Shuai Wang

IPC: C07C329/16 ,  B03D1/002 ,  B03D1/14

CPC classification number: C07C329/16 ,  B03D1/002 ,  B03D1/14 ,  B03D2201/007 ,  B03D2201/02 ,  B03D2203/02

Abstract: A method for preparing xanthate by a slurry method includes steps of: adding a mixture of dichloromethane and carbon disulfide as a reaction solvent in a slurry reactor, and then adding alcohol and caustic alkali to react with carbon disulfide under less than 1 atm to remove heat released by the reaction by evaporating the solvent; performing vacuum distillation after the reaction to remove the solvent and water, so as to obtain the xanthate; transporting the xanthate to a granulation equipment for granulating, and then drying in a drying equipment to obtain a product. The method is performed in a system formed by a reaction equipment, a solvent recovery equipment, the granulation equipment, and the drying equipment, wherein a main equipment of the reaction system is a slurry reactor. The method has advantages of high efficiency, low energy consumption, good safety, environmental friendliness, convenient operation and the like.

公开(公告)号：US12012130B2

公开(公告)日：2024-06-18

申请号：US17044826

申请日：2018-10-30

Applicant: CENTRAL SOUTH UNIVERSITY

Inventor： Guangjun Gao ,  Weiyuan Guan ,  Shuai Wang

IPC: B61G11/12 ,  B61D15/06 ,  B61F19/04

CPC classification number: B61G11/12 ,  B61D15/06 ,  B61F19/04 ,  B60Y2200/30

Abstract: A reusable collision energy absorption device for a rail vehicle includes an impacted rod, a damping structure including a damping plug, a guide tube and a damping elastic element, a return structure including a return piston and an elastic return element, an outer tube having a tubular structure, and an interior partitioned into a front cavity and a rear cavity through a partition plate provided with a damping hole in the form of a through hole. A portion of the damping plug is in the damping hole when the damping plug is in an initial position, and the damping plug can move in a front-rear direction when the device is impacted. A gap between a radial thickest portion of the damping plug and the damping hole allows the fluid to circulate between the front cavity and the rear cavity.