Patent · US Active

Process for preparing MMA in high yields

US11299449B2 · kind B2 · utility

3Cited by

14References

20Claims

0Family size

Assignee

Röhm GmbH · DE

Inventors

Steffen Krill · Mühltal, DE
Florian Zschunke · Frankfurt, DE
Belaid Ait Aissa · Darmstadt, DE
Marcel Treskow · Darmstadt, DE

Key dates

Filing date	Jun 7, 2019
Grant date	Apr 12, 2022
Priority date	—
Expiry date	Jun 7, 2039

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C69/54
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

A process for preparing methyl methacrylate by direct oxidative esterification of methacrolein has elevated yields compared to known processes. Methyl methacrylate (MMA) is used in large amounts for preparing polymers and copolymers with other polymerizable compounds. In addition, methyl methacrylate is an important synthesis unit for a variety of specialty esters based on methacrylic acid (MAA), which can be produced by transesterification with the appropriate alcohol. There is consequently a great interest in very simple, economic, and environmentally friendly processes for preparing methyl methacrylate. A superior workup of the reactor output from the oxidative esterification of methacrolein allows specific by-products to be isolated and then additionally converted to alkyl methacrylates, especially to MMA.

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