| TECHNOLOGY |
Using 2 phases, has been the way of getting around the difficulty in homogeneous catalysis of having to separate expensive catalysts from rest of reaction mixt. But biphasic systems do have slow rates of reaction Now a new biphasic catalysis system consisting of water & supercritical CO2 with emulsion-forming surfactants drastically improves reaction rates The researchers investigated the hydrogenation of alkenes catalyzed by water-soluble phosphine Rh complexes. The rates are comparable with single-phase reactions in organic solvents using Wilkinson's catalyst The reactions were run at 40C & 4,000 psi with one of 3 surfactants. Simply reducing the pressure at end of reaction breaks the emulsion |
| UPDATE | 01.00 |
| AUTHOR |
Johnston Keith P., Prof Chem Engg., Uni. Texas at Austin Tumas William; Los Alamos National Laboratory |
| LITERATURE REF. | J. Am. Chem. Soc., 121, p. 11902 (1999) |
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