Title:
METHOD FOR IMPROVING ULTRA-VIOLET LIGHT TRANSMITTANCE OF ETHYLENE GLYCOL
Document Type and Number:
WIPO Patent Application WO/2023/245919
Kind Code:
A1
Abstract:
Provided is a method for improving ultra-violet light transmittance of ethylene glycol. The method comprises the following steps: (1) subjecting ethylene glycol, a catalyst, and water to a hydrolysis reaction at a temperature of 120 °C to 150 °C; and (2) adding a stabilizer into a product of the hydrolysis reaction, distilling under reduced pressure, and condensing to isolate a fraction. The described method can effectively decompose complex organic compound impurities in the ethylene glycol that contain carboxyl, conjugated double bonds, and aldehyde ketones and affect the ultra-violet light transmittance, thereby significantly improving UV values of ethylene glycol at 220 nm, 275 mm, and 350 nm, and the method takes into account requirements on environmental protection and safety and economic benefits and thereby has a wide application prospect.
More Like This:
Inventors:
QIU WENHAO (CN)
GUO YANG (CN)
WANG BANGYING (CN)
ZENG SHUHUA (CN)
GUO YANG (CN)
WANG BANGYING (CN)
ZENG SHUHUA (CN)
Application Number:
PCT/CN2022/123774
Publication Date:
December 28, 2023
Filing Date:
October 08, 2022
Export Citation:
Assignee:
SHENZHEN CAPCHEM TECHNOLOGY CO LTD (CN)
International Classes:
C07C31/20; C07C29/74; C07C29/80; C07C29/88; C07C29/94
Foreign References:
| CN114988984A | 2022-09-02 | |||
| JP2011068699A | 2011-04-07 | |||
| JP2001031606A | 2001-02-06 | |||
| CN110642676A | 2020-01-03 | |||
| CN101928201A | 2010-12-29 |
Attorney, Agent or Firm:
SHENZHEN GHZF INTELLECTUAL PROPERTY AGENCY (GENERAL PARTNERSHIP) (CN)
Download PDF:
Previous Patent: PERMANENT MAGNET MOTOR
Next Patent: WORD LINE DRIVING CIRCUIT, WORD LINE DRIVER AND STORAGE APPARATUS
Next Patent: WORD LINE DRIVING CIRCUIT, WORD LINE DRIVER AND STORAGE APPARATUS