Verkade super base-catalysed transesterification of propylene carbonate with methanol to co-produce dimethyl carbonate and propylene glycol

Autor:	Pieter S. van Heerden, D. Bradley G. Williams, Mike S. Sibiya, Megan M. Kirk, Roger A. Harris
Rok vydání:	2009
Předmět:	chemistry.chemical_classification Base (chemistry) Process Chemistry and Technology Inorganic chemistry Transesterification Catalysis chemistry.chemical_compound chemistry Alkoxide Propylene carbonate Organic chemistry Carbonate Methanol Physical and Theoretical Chemistry Dimethyl carbonate
Zdroj:	Journal of Molecular Catalysis A: Chemical. 304:147-152
ISSN:	1381-1169
DOI:	10.1016/j.molcata.2009.02.005
Popis:	The co-generation of dimethyl carbonate (potential fuels additive, environmentally friendly replacement for more toxic methylating agents, etc.) and propylene glycol via the transesterification reaction of propylene carbonate and methanol was studied using base catalysis. Verkade super bases (proazaphosphatranes) proved especially effective at low catalyst loadings (0.5%) for the rapid transesterification of propylene carbonate with methanol under mild conditions and with high product selectivity (typically >99.5%). These bases neatly avoid the use of alkoxide catalysts which generate by-products in their neutralisation. The kinetics of the reactions were studied using data obtained from in situ NMR reaction monitoring. The influences of several reaction optimisation parameters are also dealt with.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::b9cc207149aa842e404fd0e810709954 https://doi.org/10.1016/j.molcata.2009.02.005 Zobrazit plný text záznamu Full Text from ScienceDirect