乙基麦芽酚合成中水解工艺的改进

Process Improvement of Hydrolization Step in the Course of Synthesizing Ethyl Maltol

摘要:

为了提高乙基麦芽酚的产率和减少废水中氯化钠的含量，采用密闭水解法对以糠醛和氯气为原料合成乙基麦芽酚过程中的常压水解步骤进行改进。通过正交试验对密闭水解法的工艺条件进行了优化，并确定了适宜工艺条件为：反应温度为125℃，反应压力为2.1MPa，溶剂中甲醇的体积分数为65％，反应时间为3.5h。与常压水解法比较，乙基麦芽酚的产率可以提高3.9%，氢氧化钠消耗量降低78％，废水中氯化钠的含量降低77.4%，副产品氯甲烷可以回收利用。

Abstract:

With the aim to increase the yield of ethyl maltol and to decrease the content of sodium chloride in discharge water, the sealed hydrolization method was used to improve the atmospheric pressure hydrolization process in the course of synthesizing ethyl maltol by furol and chlorine gas. The process conditions of sealed hydrolization method were optimized by orthogonal experiment, and the optimum process conditions were as follows: the reaction temperature was 125℃, the reaction pressure was 2.1MPa, the volume fraction of methanol in solvent was 65%, and the reaction time was 3.5h. Comparing with atmospheric pressure hydrolization process, the yield of ethyl maltol was increased 3.9%, the consumption of sodium hydroxide was decreased 78％, the content of sodium chloride in discharge water was reduced 77.4%, and the chloromethane resulted as byproduct could be recovered and utilized by the sealed hydrolization process under the optimum process conditions.