Patent · US Active

Process for the preparation of di- and polyamines of the diphenylmethane series

US10759736B2 · kind B2 · utility

0Cited by

5References

15Claims

0Family size

Assignee

Covestro Deutschland AG · DE

Inventors

Stefan Wershofen · Mönchengladbach, DE
Richard Adamson · Leichlingen, DE
Georg Pirkl · Dormitz, DE

Key dates

Filing date	Oct 10, 2019
Grant date	Sep 1, 2020
Priority date	—
Expiry date	Oct 10, 2039

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C211/50
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

The invention relates to a process for the preparation of di- and polyamines of the diphenylmethane series (MDA), in which firstly crude MDA is prepared and is then subjected to a distillation process, wherein the distillation process comprises the following:

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