Patent · US Active

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

US10538480B2 · kind B2 · utility

0Cited by

14References

17Claims

0Family size

Assignee

Covestro Deutschland AG · DE

Inventors

Jürgen Arras · Itzehoe, DE
Tobias Keller · Dittelsheim-Heßloch, DE
Javier Perez-Ramirez · Zürich, CH

Key dates

Filing date	Jun 26, 2017
Grant date	Jan 21, 2020
Priority date	—
Expiry date	Jun 26, 2037

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C209/54
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

The invention relates to a production process for di- and polyamines of the diphenylmethane series by the rearrangement of a condensation product of aniline and a methylene group-supplying agent preferably selected from the group consisting of aqueous formaldehyde solution, gaseous formaldehyde, para-formaldehyde, trioxane and mixtures thereof, wherein said condensation product is reacted in the presence of at least one silica-alumina catalyst, said catalyst having

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