Kinetics of a diels-alder reaction of maleic anhydride and isoprene in supercritical CCh

Document Type

Article

Publication Date

10-18-2001

Abstract

The kinetics of the reaction of maleic anhydride and isoprene in supercritical carbon dioxide was studied over an extended concentration range, from 5 × 10-5 to 1.3 × 10-2 mole fractions of both maleic anhydride and isoprene at 60 °C and pressure 100 atm. The apparent rate constant of the reaction was found to be concentration dependent, in contradiction with the literature data. The results are interpreted in terms of limited solubility of maleic anhydride in supercritical CO2. The solubility of maleic anhydride in supercritical carbon dioxide was directly measured by sampling and analyzing the supercritical phase. The observed sharp increase in the apparent rate constant of the reaction between maleic anhydride and isoprene correlates with the solubility of maleic anhydride in supercritical carbon dioxide. The interpretation was confirmed using visual observations of the phase behavior. The rate constant of the reaction measured under the true supercritical, single phase, conditions is kx = (17.0 ±1.3) hr-1 (mole fraction units, 60 °C, pressure 100 atm). © 2001 American Chemical Society.

Identifier

0035909520 (Scopus)

Publication Title

Journal of Physical Chemistry A

External Full Text Location

https://doi.org/10.1021/jp011548a

ISSN

10895639

First Page

9427

Last Page

9435

Issue

41

Volume

105

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