Continuous process for singlet oxygenation of hydrophobic substrates in microemulsion using a pervaporation membrane.

Journal of colloid and interface science (2004-12-14)
Laurent Caron, Véronique Nardello, José Mugge, Erik Hoving, Paul L Alsters, Jean-Marie Aubry
RESUMEN

Chemically generated singlet oxygen (1O2, 1Deltag) is able to oxidize a great deal of hydrophobic substrates from molybdate-catalyzed hydrogen peroxide decomposition, provided a suitable reaction medium such as a microemulsion system is used. However, high substrate concentrations or poorly reactive organics require large amounts of H2O2 that generate high amounts of water and thus destabilize the system. We report results obtained on combining dark singlet oxygenation of hydrophobic substrates in microemulsions with a pervaporation membrane process. To avoid composition alterations after addition of H2O2 during the peroxidation, the reaction mixture circulates through a ceramic membrane module that enables a partial and selective dewatering of the microemulsion. Optimization phase diagrams of sodium molybdate/water/alcohol/anionic surfactant/organic solvent have been elaborated to maximize the catalyst concentration and therefore the reaction rate. The membrane selectivity towards the mixture constituents has been investigated showing that a high retention is observed for the catalyst, for organic solvents and hydrophobic substrates, but not for n-propanol (cosurfactant) and water. The efficiency of such a process is illustrated with the peroxidation of a poorly reactive substrate, viz., beta-pinene.

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Sigma-Aldrich
Sodium molybdate dihydrate, ACS reagent, ≥99%
Sigma-Aldrich
Sodium molybdate dihydrate, ≥99.5%
Sigma-Aldrich
Sodium molybdate, ≥98%
Sigma-Aldrich
Sodium molybdate dihydrate, ≥99.5%, suitable for plant cell culture
Sigma-Aldrich
Sodium molybdate, anhydrous, powder, −100 mesh particle size, 99.9% trace metals basis
Sigma-Aldrich
Sodium molybdate dihydrate, 99.99% trace metals basis

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