| 摘要 |
PROBLEM TO BE SOLVED: To provide a continuous, high yield and long stability method for producing 2,3-dichloro-1-propanol (2,3-DCH) and epichlorohydrin by chlorination of allyl alcohol in a hydrochloric acid solution. SOLUTION: In the method for producing 2,3-DCH in which the solution including the 2,3-DCH obtained by chlorination of allyl alcohol in a hydrochloric acid solution is introduced to a degasification tower for diffusing hydrogen chloride, then the hydrogen chloride is returned to a reactor and the 2,3-DCH is recovered from the residual solution, to keep the concentration of chlorine dissolved in the reactor outlet solution at this side of the degasification tower to 0.015 g/mL or less and to keep the partial pressure of chlorine in the vapor phase in the reactor at this side of the degasification tower, to 0.08 MPa (absolute pressure) or less, the concentration of chlorine in the reactor outlet solution at this side of the degasification tower and/or the concentration (partial pressure) of chlorine in the vapor phase are measured using an analyzer, thus the flow of chlorine gas at this side of the degasification tower is controlled.
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