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US 10,294,251 B2Granted
Process for preparing alkoxysilanes
AssigneeMomentive Performance Materials Inc.
InventorsAlain Lejeune, Antonio Chaves, Tiberiu Simandan, Ilaria Vecchi, Lesley Hwang, Andrea Trotto
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Abstract
A transesterification process for preparing alkoxysilane includes removal of metal transesterification catalyst from the alkoxysilane transesterification reaction medium.
Claims20
A process for preparing an alkoxysilane transesterification reaction product which comprises
- (a) transesterifying at least one transesterifiable alkoxysilane with at least one transesterifying alcohol under transesterification reaction conditions in the presence of at least one metal transesterification catalyst accompanied by removal of byproduct and/or unreacted alcohol to produce a crude alkoxysilane transesterification reaction product;
- and
- (b) removing at least part of the metal transesterification catalyst from the reaction product, wherein removal of at least part of the metal transesterification catalyst from the reaction product of step (a) comprises hydrolyzing the metal transesterification catalyst to form a catalyst metal oxide and removing the catalyst metal oxide from the reaction product of step (a).
A process for preparing an alkoxysilane transesterification reaction product which comprises
- (a) transesterifying at least one transesterifiable alkoxysilane with at least one transesterifying alcohol under transesterification reaction conditions in the presence of at least one metal transesterification catalyst accompanied by removal of byproduct and/or unreacted alcohol to produce a crude alkoxysilane transesterification reaction product;
- and
- (b) removing at least part of the metal transesterification catalyst from the reaction product, wherein the metal transesterification catalyst is removed by adding an absorption medium of precipitated silica to the crude alkoxysilane transesterification reaction product of step (a) and stirring the mixture, adsorbing the metal transesterification catalyst on an adsorption medium followed by filtering the adsorption medium containing adsorbed catalyst.
A process for preparing an alkoxysilane transesterification reaction product comprising:
- (a) adding a metal transesterification catalyst to a transesterifiable alkoxysilane in the amount of from 0.01 weight percent to 5 weight percent, based on the weight of the transesterifiable alkoxysilane, to form a mixture;
- (b) heating the mixture from step (a) under conditions sufficient to effect a transesterification reaction;
- (c) adding a transesterifying alcohol into the mixture during heating step (b);
- (d) removing byproduct alcohol formed during the transesterification reaction;
- (e) hydrolyzing the metal transesterification catalyst to form a metal oxide of said catalyst;
- (g) removing the metal oxide to form a alkoxysilane transesterification reaction product;
- and, optionally,
- (h) further purifying the alkoxysilane transesterification reaction product of step (g).
5 more elements
Dependencies are inferred from the claim text.