Title:
PROCESS FOR SEPARATING AND PURIFYING BY-PRODUCT 2-CHLOROETHYL N-BUTYL ETHER IN PRODUCTION PROCESS OF TRIS(2-BUTOXYETHYL)PHOSPHATE
Document Type and Number:
WIPO Patent Application WO/2023/236938
Kind Code:
A1
Abstract:
Disclosed is a process for separating and purifying a by-product 2-chloroethyl n-butyl ether in a production process of tris(2-butoxyethyl)phosphate, comprising the following steps: adding titanium tetrachloride into recovered ethylene glycol monobutyl ether containing 2-chloroethyl n-butyl ether having a concentration of ≥ 30%; thoroughly dissolving the resulting mixture and cooling same, dropwise adding excessive phosphorus oxychloride, and carrying out thermal insulation for a period of time after dropwise addition is completed; continuously heating same, thoroughly reacting the ethylene glycol monobutyl ether in the material into butoxyphosphonic dichloride, and carrying out reduced-pressure distillation to separate out a crude 2-chloroethyl n-butyl ether product and a base material, the base material being used for preparing TBEP; adding liquid caustic soda and water into the crude 2-chloroethyl n-butyl ether product, stirring same for alkali washing, and then standing same to separate out a discharging layer and an alkali washing wastewater layer; and adding water into the separated-out discharging layer, and stirring and washing and then standing same to separate out a finished 2-chloroethyl n-butyl ether product and washing wastewater. The present invention is closely combined with a tris(2-butoxyethyl)phosphate production process, and the ethylene glycol monobutyl ether is centralizedly processed and recovered within a production intermittent period by utilizing existing devices.
Inventors:
WANG FUBING (CN)
WANG YI (CN)
JIANG JIANFENG (CN)
CHEN DIXING (CN)
XU RUI (CN)
WANG YI (CN)
JIANG JIANFENG (CN)
CHEN DIXING (CN)
XU RUI (CN)
Application Number:
PCT/CN2023/098549
Publication Date:
December 14, 2023
Filing Date:
June 06, 2023
Export Citation:
Assignee:
ZHEJIANG WANSHENG CO LTD (CN)
International Classes:
C07C41/44; C07C41/42; C07C43/12; C07F9/09
Foreign References:
| CN114853580A | 2022-08-05 | |||
| CN106008592A | 2016-10-12 | |||
| CN106831362A | 2017-06-13 | |||
| US4421695A | 1983-12-20 | |||
| JP2001226387A | 2001-08-21 | |||
| CN109516623A | 2019-03-26 |
Attorney, Agent or Firm:
HANGZHOU ZHEKE PATENT AGENCY (GENERAL PARTNERSHIP) (CN)
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