公开(公告)号：US20210094592A1

公开(公告)日：2021-04-01

申请号：US17044826

申请日：2018-10-30

Applicant: CENTRAL SOUTH UNIVERSITY

Inventor： Guangjun GAO ,  Weiyuan GUAN ,  Shuai WANG

IPC: B61F19/04 ,  B61D15/06

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.

公开(公告)号：US20210002218A1

公开(公告)日：2021-01-07

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 ,  C07C329/14 ,  B03D1/012

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：US20210276023A1

公开(公告)日：2021-09-09

申请号：US15734226

申请日：2020-06-19

Applicant: CENTRAL SOUTH UNIVERSITY

Inventor： Hong ZHONG ,  Qing SUN ,  Shuai WANG

IPC: B03D1/012

Abstract: An alkyl thioether ethyl hydroxamic acid beneficiation reagent and a preparation method and application thereof are provided. The alkyl thioether ethyl hydroxamic acid molecules have two functional groups, a thioether group and a hydroxamate group. The beneficiation reagent is obtained by esterification of alkyl thioether acetic acid and methanol and then by hydroxamation of hydroxylamine and an alkali. The alkyl thioether ethyl hydroxamic acid beneficiation reagent can be used as a collector for mineral flotation. The preparation method is simple and has a high yield. The thioether and hydroxamate group in the molecules have a synergistic effect and can effectively improve the collection performance.