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研究了反应萃取法分离提取发酵液中1,3-丙二醇的重要反应—缩醛反应。考察了反应温度,反应时间,乙醛的添加量,以及催化剂对1,3-丙二醇转化率的影响。结果表明,通过乙醛与1,3丙二醇可以发生可逆缩醛反应生成2-甲基-1,3-二恶烷,得到最佳的反应条件为反应时间1h,反应温度为55℃,乙醛与1,3-丙二醇的物质的量比为6∶1,树脂催化剂为20g/L,1,3-丙二醇的转化率可以达到96%以上,可以满足1,3-丙二醇转化率的要求。首次采用D005-Ⅱ树脂作为缩醛反应的催化剂,考虑了树脂的重复使用情况。
The important reaction-acetal reaction for the separation and extraction of 1,3-propanediol from fermentation broth was studied. The effects of reaction temperature, reaction time, the amount of acetaldehyde added and the catalyst on the conversion of 1,3-propanediol were investigated. The results showed that 2-methyl-1,3-dioxane could be formed by acetaldehyde and 1,3-propanediol. The optimal reaction conditions were reaction time 1h, reaction temperature 55 ℃, Propanediol is 6: 1, the resin catalyst is 20g / L, the conversion rate of 1,3-propanediol can reach more than 96%, which can meet the requirement of 1,3-propanediol conversion rate. For the first time using D005-Ⅱ resin acetal reaction catalyst, taking into account the repeated use of resin.