Patent · US Active

Process for preparing cyclic esters from alpha-hydroxy esters and catalysts used therein

US10899730B2 · kind B2 · utility

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2References

26Claims

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Assignee

Katholieke Universiteit Leuven · BE

Inventors

Rik De Clercq · Mechelen, BE
Michiel J. Dusselier · Kessel-Lo, BE
Bert Sels · Balen, BE

Key dates

Filing date	Sep 25, 2017
Grant date	Jan 26, 2021
Priority date	—
Expiry date	Sep 25, 2037

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07D319/12
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

A process for preparing cyclic esters by means of a transesterification reaction in the gas phase, comprises the steps of: (i) vaporizing a liquid solution of alpha-hydroxy esters, (ii) passing the ester vapors through a reaction zone containing a solid catalyst and (iii) recovering the cyclic esters from the gaseous product stream; and wherein the solid catalyst comprises at least one metal of titanium (Ti) and Zirconium (Zr), and a SiO2 support, and wherein said metal is chemically bound to the SiO2 support through M-O—Si chemical bonds.

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