Sodium Chloride → Epichlorohydrin

Participants

Reaction Steps

A sulfonation flask is charged with 87.5 pans of hydrolysed polymaleic anhydride (0.5 COOH equivalents, molecular weight 500-2,000, e.g. Belclene® 200), 80 parts of water and 3 parts of NaCl. After 31 parts of epichlorohydrin have been added, the reaction mixture is heated to 80°-85° C. for about 1 hour, cooled down to room temperature and neutralised with sodium hydroxide solution (pH about 6.8). Excess epichlorohydrin and dichloropropanol formed in the course of the reaction are then distilled off azeotropically. After adjustment to a solids concentration of 50%, the product is a mixture of 35% of polymer, 15% of 3-chloro-1,2-propanediol and 50% of water.

Provenance & Evidence