Environment-friendly preparation process for producing epoxy chloropropane by complexation and extraction

The invention discloses an environment-friendly preparation process for producing epoxy chloropropane by complexation and extraction. The process comprises the following steps: adding complexation extractant into dichloropropanol solution so as to extract HCl and dichloropropanol from the solution in one time; returning the extracted reacting liquid to a chlorohydrination system, and adding lime milk or liquid caustic soda and sodium carbonate into the complexation extraction liquid containing the HCl and the dichloropropanol for saponification so as to produce the epoxy chloropropane, wherein the content of the calcium chloride in raffinate in the bottom of a saponificationcolumn is about 30-40% (such as producing sodium chloride by utilizing the liquid caustic soda by saponification); and carrying out multiple-effect evaporation and concentration on the treated mother liquor to producing the calcium chloride, wherein the concentrated water is used for preparing the lime milk. The invention has the advantage