Production method of high-purity 3-chloro-1, 2-propanediol

The invention discloses a production method of high-purity 3-chloro-1, 2-propanediol, which comprises the following steps: (1) taking sulfuric acid, benzenesulfonic acid and succinic acid, respectively dissolving the three in deionized water, and preparing into sulfuric acid solution, benzenesulfonic acid solution and succinic acid solution; (2) firstly mixing part of the sulfuric acid solution, part of the benzenesulfonic acid solution and part of epichlorohydrin, carrying out reaction for a period of time, raising temperature, further adding the remaining epichlorohydrin, sequentially adding the remaining benzenesulfonic acid solution and the sulfuric acid solution according to time periods, then adding the succinic acid solution once, raising the temperature, and continuously carrying out the reaction; (3) adding alkaline solution after completing hydrolysis reaction, and stirring for leading the reaction to be uniform; (4) carrying out dehydration on hydrolysate after adding the alkaline solution, adding the alkaline solution after finishing the dehydration, and raising the temperature under stirring condition; and (5) firstly heating materials under vacuum condition, then transferring the materials into a distillation system, and obtaining a product of 3-chloro-1, 2-propanediol by distillation when the vacuum degree is not less than 0.1MPa.