Method for Recovering Di-Trimethylolpropane By Distillation

摘要

Distillative process for obtaining ditrimethylolpropane from solutions includes separating ditrimethylolpropane from the solution in a first distillation unit into a first tops fraction comprising low-boiling compounds having a lower boiling point than ditrimethylolpropane and a first bottoms fraction; introducing the first bottoms fraction into a second distillation unit having at least 5 theoretical plates, said unit being configured as a thin-film evaporator with a column attachement and drawing off a second tops fraction comprising intermediate-boiling compounds having a lower boiling point than ditrimethylolpropane as well as withdrawing a second bottoms fraction from the second distillation unit and introducing the second bottoms fraction into a third distillation unit having at least 4 theoretical plates, said unit being configured as a thin-film evaporator with a column attachement, such that ditrimethylolpropane is obtained as a third tops fraction and high boilers are removed as a third bottoms fraction.

主权项

1. Distillative process for obtaining ditrimethylolpropane from solutions comprising ditrimethylolpropane, characterized in that:
(a) the solution comprising ditrimethylolpropane is separated in a first distillation unit into a first tops fraction comprising low-boiling compounds having a lower boiling point than ditrimethylolpropane and a bottoms fraction; (b) the bottoms fraction obtained after step a) is introduced into a second distillation unit having at least 5 theoretical plates, said unit being configured as a thin-film evaporator with a column attachement, and a second tops fraction comprising intermediate-boiling compounds having a lower boiling point than ditrimethylolpropane is drawn off, and a bottoms fraction is withdrawn; and (c) the bottoms fraction obtained after step b) is introduced into a third distillation unit having at least 4 theoretical plates, said unit being configured as a thin-film evaporator with a column attachement, in which ditrimethylolpropane is obtained as a third tops fraction and high boilers are removed as a bottoms fraction.