甲醇与乙醛水溶液缩合制备二甲醇缩乙醛研究

摘要

以甲醇和乙醛水溶液为原料,合成二甲醇缩乙醛,反应过程中考察催化剂种类、催化剂改性效果、搅拌速度、反应温度、反应平衡时间、醇/醛摩尔比、乙醛质量分数等因素对反应的影响。结果表明：以NKC-9树脂作为催化剂,搅拌速度300 r/min,反应温度30益,反应时间25 min,甲醇/乙醛摩尔比13.1时乙醛的转化率最高。1%SnCl4进行改性的改性效果最好。%The 1,1-dimethoxyethane was synthesized with the raw material of acetaldehyde aqueous solution and methanol. Experiment respectively investigated influence of reaction from the types of catalyst, stirring speed, reaction temperature, reaction time of arrival in balance, the molar ratio of methanol and acetaldehyde, acetaldehyde concentration. The modification effect of catalyst was also investigated. The experimental results showed that NKC-9 resin gave the highest acetalization behavior. The highest conversion rate needed stirring rate 300 r/min, the reaction temperature of 30 ℃, reaction time of 25 min, the mole ratio of methanol and acetaldehyde of 13. 1. Using modified catalyst 1%SnCl4 resin catalyst had the best modification effect.