Title:
METHOD FOR PREPARING HIGH PURITY DIMETHYL DIALLYL AMMONIUM CHLORIDE MONOMER IN HIGH YIELD
Document Type and Number:
WIPO Patent Application WO/2020/140187
Kind Code:
A1
Abstract:
The present invention belongs to the technical field of organic synthesis, and particularly relates to a method for preparing a high purity dimethyl diallyl ammonium chloride monomer in high yield. The preparation method provided by the present invention involves stagewise and alternating addition of allyl chloride and sodium hydroxide solution dropwise, the optimum alternate addition amounts and reaction times of allyl chloride and sodium hydroxide being determined using an acid-base indicator through extensive tests. The preparation method prevents allyl chloride from being present in a highly alkaline environment, which avoids generation of byproducts such as allyl alcohol in large amounts, and increases the utilization rate of allyl chloride. Further, the preparation method employs a pressure-resistant closed reaction vessel to ensure that dimethylamine does not leak and can participate completely in the reaction. The dimethyl diallyl ammonium chloride monomer solution obtained by the preparation method has a light color and few impurities, does not require decoloration and impurity removal with activated carbon, and has a high purity, has very low contents of amine salts and chlorine ions, and a yield approximate to an ideal value. Use of the product in a homopolymerization experiment affords a colorless, transparent and clear polymer solution, with the viscosity and molecular weight thereof being far superior to those of like products.
Inventors:
ZHU NIANDE (CN)
CHENG FEI (CN)
FENG BIN (CN)
ZHANG YINGUANG (CN)
YANG CUNXIN (CN)
CHENG FEI (CN)
FENG BIN (CN)
ZHANG YINGUANG (CN)
YANG CUNXIN (CN)
Application Number:
PCT/CN2019/000149
Publication Date:
July 09, 2020
Filing Date:
July 29, 2019
Export Citation:
Assignee:
SHANDONG TIANCHENG CHEMICAL CO LTD (CN)
International Classes:
C07C209/08; C07C209/12; C07C209/84; C07C211/63
Foreign References:
| CN109438250A | 2019-03-08 | |||
| CN1243822A | 2000-02-09 | |||
| CN1508119A | 2004-06-30 |
Attorney, Agent or Firm:
JINAN SHUNYUAN PATENT AGENCY CO., LTD. (CN)
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