公开(公告)号：US20230406796A1

公开(公告)日：2023-12-21

申请号：US18078107

申请日：2022-12-09

Applicant: SHENZHEN CAPCHEM TECHNOLOGY CO., LTD.

Inventor： WENHAO QIU ,  YANG GUO ,  BANGYING WANG ,  SHUHUA ZENG

IPC: C07C29/94

CPC classification number: C07C29/94 ,  C07C2523/04 ,  C07C2523/02

Abstract: The present invention provides a method for improving ultra-violet light transmittance of ethylene glycol, which includes the following steps: (1) subjecting ethylene glycol, a catalyst and water to a hydrolysis reaction at 120° C.-150° C.; and (2) adding a stabilizer into a product of the hydrolysis reaction, then conducting distillation at reduced pressure, and condensing to recover a fraction. The method of the present invention can effectively decompose impurities of carboxyl-, conjugated double bond-, aldehyde and ketone-containing complex organic compounds in the ethylene glycol which affect the ultra-violet light transmittance, obviously improve UV values of the ethylene glycol at 220 nm, 275 nm and 350 nm, give consideration to the requirements of environmental protection and safety and economic benefits, and have a broad application prospect.