Title:
PREPARATION METHOD FOR POLYOXYMETHYLENE DIMETHYL ETHER AND MIXTURE THEREOF
Document Type and Number:
WIPO Patent Application WO/2021/052328
Kind Code:
A1
Abstract:
The present invention provides a preparation method for a polyoxymethylene dimethyl ether (DMMNn, generally, n = 3-8 or 2-8) and a mixture thereof. The preparation method comprises: a mixture of an aqueous formaldehyde solution and polyalcohol is heated and dehydrated under vacuum conditions to yield flowing polyoxymethylene containing low moisture; then the flowing polyoxymethylene is heated and gasified to obtain relatively pure gaseous formaldehyde; then the gaseous formaldehyde is mixed with methylal, the previous batch of low-boiling-point substances applied, macromolecules, and the like in the presence of a catalyst; catalytic reaction is performed to filter out the catalyst and purify synthetic liquid; normal pressure distillation and reduced pressure distillation are respectively performed; separation is performed to obtain low-boiling-point substances, macromolecules, and a DMMn finished product; the DMMn finished product is then subjected to reduced pressure rectification, single-component products can be obtained, and the residual polyalcohol after the gasification of formaldehyde is returned and applied to the next batch of formaldehyde concentration. Or, the preparation method comprises: an aqueous formaldehyde solution, polyalcohol, and the previous batch of macromolecular mixture applied are heated under vacuum conditions to remove moisture so as to obtain an anhydrous flowable polyoxymethylene etherate; the anhydrous flowable polyoxymethylene etherate is mixed with methylal, the previous batch of low-boiling-point substances applied, macromolecules, and the like in the presence of a catalyst; catalytic reaction is performed to filter out the catalyst; normal pressure distillation and reduced pressure distillation are respectively performed; separation is performed to obtain low-boiling-point substances, macromolecules, and a DMMn finished product; the DMMn finished product is then subjected to reduced pressure rectification, single-component products can be obtained, and the separated low-boiling-point substances and macromolecules are returned and applied to the next batch of synthesis.
Inventors:
CAI YIJIN (CN)
WANG XINGLU (CN)
CAI YICHAO (CN)
ZHENG JIZHEN (CN)
SUN HUA (CN)
LI WENQIANG (CN)
CHEN HAILONG (CN)
XU SHENGKAI (CN)
WANG XINGLU (CN)
CAI YICHAO (CN)
ZHENG JIZHEN (CN)
SUN HUA (CN)
LI WENQIANG (CN)
CHEN HAILONG (CN)
XU SHENGKAI (CN)
Application Number:
PCT/CN2020/115358
Publication Date:
March 25, 2021
Filing Date:
September 15, 2020
Export Citation:
Assignee:
SHANDONG CHENXIN NEW ENERGY CO LTD (CN)
International Classes:
C07C41/56; C07C45/83; C07C47/058; C07C43/30
Foreign References:
| CN105541568A | 2016-05-04 | |||
| CN103339094A | 2013-10-02 | |||
| CN105541568A | 2016-05-04 | |||
| CN107353188A | 2017-11-17 | |||
| CN105541568A | 2016-05-04 | |||
| CN101193948A | 2008-06-04 | |||
| CN101198630A | 2008-06-11 | |||
| GB682487A | 1952-11-12 |
Attorney, Agent or Firm:
CHOFN INTELLECTUAL PROPERTY (CN)
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