反应萃取耦合法分离1,3-丙二醇中缩醛反应的研究  

Acetal Reaction in Separation of 1,3-Propanediol by Coupling Method of Reaction-Extraction

作　　者：张慧敏[1] 李彦[1] 钱倩[1] 关怡新[1] 姚善泾[1] 

机构地区：[1]浙江大学化学工程与生物工程学系

出　　处：《化学反应工程与工艺》2005年第6期551-555,共5页Chemical Reaction Engineering and Technology

基　　金：国家自然科学基金资助项目(20276065)

摘　　要：研究了用反应萃取耦合法分离1,3-丙二醇过程中的关键反应-缩醛反应。考察了反应温度、反应时间、催化剂以及乙醛加入量对反应过程的影响。结果表明,在强酸性树脂催化下,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(口啞)烷,得到了可逆缩醛反应的最佳反应条件。当反应温度为55℃,反应时间在15 min左右,根据反应的特点,首次采用了强酸性树脂和硫酸分段催化,乙醛与1,3-丙二醇摩尔浓度比为3:1时,萃取液中1,3-丙二醇的转化率最高,其总转化率约为90．02％。Acetal reaction in separation of 1,3-propanediol （PDO）by coupling method of reactionextraction was studied. Effects of temperature, reaction time, catalyzing method, acetaldehyde amount on reaction were investigated. Experiment results indicated that the process coupling the re versible reaction of PDO with acetaldehyde to 2-methyl-1, 3-dioxane by acid resin and a synchronous extraction of the product by toluene could effectively separate PDO from dilute aqueous solutions. Under the preferably reaction conditions of 55 C, molar ratio of acetaldehyde to 1,3-PDO 3 ： 1, reaction time 15 rain and two stages catalysis, 90. 02% of 1,3-PDO could be obtained from dilute aqueous solution.

关 键 词：1.3-丙二醇 反应萃取耦合 缩醛反应 

分 类 号：O623.413[理学—有机化学] TQ028.32[理学—化学]