Patent · US Active

Method for recovering di-trimethylolpropane by distillation

US9745236B2 · kind B2 · utility

0Cited by

9References

20Claims

0Family size

Assignee

OXEA GMBH · DE

Inventors

Guido D. Frey · Riedstadt, DE
Norman Nowotny · Essen, DE
Kurt Schalapski · Oberhausen, DE
Heinz Strutz · Usingen, DE

Key dates

Filing date	Oct 24, 2012
Grant date	Aug 29, 2017
Priority date	—
Expiry date	Aug 14, 2034

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C43/132
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

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 attachment 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 attachment, such that ditrimethylolpropane is obtained as a third tops fraction and high boilers are removed as a third bottoms fraction.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.