Process for preparing 3-methyl-2-butene-1-aldehyde diisopentenyl acetal through continuous reactive distillation

The invention discloses a process for preparing 3-methyl-2-butene-1-aldehyde diisopentenyl acetal by virtue of continuous reaction and rectification. The process comprises a process of preparing 3-methyl-2-butene-1-aldehyde diisopentenyl acetal through reactive distillation of isopentenol and isopentenal in a reactive distillation tower, and is characterized in that the content of 2-methyl-3-butene-2-ol in liquid phases of third to fifth tower plates counted from bottom to top in the reactive distillation tower is controlled to be less than 1wt%. According to the continuous reactive distillation process provided by the invention, the stable operation of the device can be ensured to be as long as 7200h or more, and the economic benefits of enterprises can be obviously improved. 本发明公开了一种连续反应精馏制备3-甲基-2-丁烯-1-醛二异戊烯基缩醛的工艺。该工艺包括在反应精馏塔中使异戊烯醇和异戊烯醛反应精馏制备3-甲基-2-丁烯-1-醛二异戊烯基缩醛的过程，其特征在于，控制反应精馏塔从下往上数第3-5块塔板液相中2-甲基-3-丁烯-2-醇的含量为1wt％以下。通过本发明提供的连续反应精馏工艺，可以保证装置在长达7200h以上的稳定运行，有利于显著提升企业的经济效益。