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36. ReactionKinetics of Transesterification with TitaniumAlkoxide-Based Phase-Transforming Catalyst.

Author

Nawaratna, Gayan and Fernando, Sandun D.

Subjects
*CHEMICAL kinetics, *TRANSESTERIFICATION, *TITANIUM oxides, *POLYMERIZATION, *MONOOLEIN, *CATALYSTS
Abstract

A catalytic process was developedthat uses a phase-transformingcatalyst to perform a transesterification reaction. In this process,titanium isopropoxide catalyst is added to the reaction medium asa liquid, and as a result of condensation polymerization, the spentcatalyst can be removed as a heterogeneous solid. The kinetics ofthis system was studied using monoolein as the model monoglycerideand isopropanol as the alcohol. A yield optimization study was alsoconducted using soybean oil as the triglyceride. The titanium isopropoxidecatalyst was able to transesterify monoolein completely, giving >99%ester yields. The kinetic study revealed that the transesterificationof monoolein with titanium isopropoxide is second-order with respectto isopropyl alcohol. The rate constant was evaluated to be 0.0002L mol–1min–1. In studies withsoybean oil, a maximum ester yield of 71% was observed using 16% (w/w)catalyst under the conditions tested. This catalyst concept, oncefully developed, can be quite useful in a multitude of processes becausethe initial homogeneous catalyst phase alleviates mass-transport issueswhereas the latter heterogeneity eases separation of the catalystfrom the medium. [ABSTRACT FROM AUTHOR]

Published
2013
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