| 摘要 |
PROBLEM TO BE SOLVED: To provide a method where, upon driving stop operation in a vacuum distillation tower for easily polymerizable (meth)acrylic acids or he like, polymerization in the distillation tower is prevented, and the driving is safely stopped at a sufficiently early time. ! SOLUTION: Provided is a distillation tower where distillation refining for (meth)acrylic acids is performed, and a reboiler is included, and, when the feed of (meth)acrylic acids to the distillation tower is stopped, and the driving of the distillation tower is stopped, after the heating of the reboiler is stopped, and a tower bottom liquid is circulated to the distillation tower through a cooler installed in the distillation tower to cool the distillation tower and the reboiler. ! COPYRIGHT: (C)2014,JPO&INPIT |
