Patent · US Active

Process for the purification of aniline from gas phase hydrogenations

US9447021B2 · kind B2 · utility

0Cited by

4References

12Claims

0Family size

Assignee

Covestro Deutschland AG · DE

Inventors

Michael Merkel · Hof, DE
Peter Lehner · Baytown, US
Bastian Mahr · Bensberg, DE
Amgad Salah Moussa

Key dates

Filing date	Mar 18, 2013
Grant date	Sep 20, 2016
Priority date	—
Expiry date	Mar 18, 2033

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C209/36
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

The present invention relates to a process for the purification of aniline which originates from gas phase hydrogenations. In this process, only a minimum proportion of the aniline has to be evaporated and condensed again. The process is highly efficient in removing compounds which have phenolic hydroxyl groups and results in minimal losses of aniline. This process also reduces the unwanted coupling mechanisms in the division of the overall crude product in the fraction condensation into individual substreams and the subsequent workup of these.

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