US 2024/0351972 A1Published application

Preparation of a catalyst for the oxidative esterification of methacrolein to methyl methacrylate, for extending service life

AssigneeRohm Co., Ltd.

InventorsAndreas Rühling, Steffen Krill, Florian Zschunke, Belaid Ait Aissa, Andreas Tepperis, Mounir Stitou

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Abstract

A process for performing a heterogeneously catalysed reaction for the oxidative esterification of aldehydes to carboxylic esters can be performed. Against this background, the process has made it possible to keep the heterogeneous, precious metal catalyst used in this method active during operation in a particularly effective manner, in order to lengthen the period between downtimes and to effect particularly sustainable catalyst management. This gives rise to the possibility of performing such processes in a very simple, economically viable and environmentally benign manner.

Claims20

Dependent claims

A continuous process for the production of alkyl methacrylates, the alkyl methacrylates being obtained by oxidative esterification of methacrolein with oxygen and an alcohol in the presence of a heterogeneous catalyst having an oxidic support and at least one precious metal, wherein the process comprises:

a. removing at least a portion of the catalyst, or the entire quantity of catalyst, in the form of a suspension, from a reactor,
b. separating the catalyst from the suspension removed in step a.,
c. optionally washing the catalyst from b. once or multiple times,
d. thermally treating the catalyst and/or treating the catalyst with a basic solution,
e. adding a fresh catalyst to the reactor, and/or
f. adding the reactivated catalyst from d. and optionally from c. to the reactor.

3 more elements

Dependencies are inferred from the claim text.