Abstract
To overcome the limitations of currently available commercial polymer and zeolite membranes for pervaporation applications, a hybrid silica membrane (HybSi ®) has been developed. In this paper the unprecedented stability of HybSi ® membrane technology for the dehydration of organic solvents is reported. It is shown that the HybSi ® membranes are suitable for demanding separations using pervaporation at temperatures up to at least 190 °C, in aggressive aprotic solvents including N-methyl-2-pyrrolidone (NMP), and down to a pH value of ∼2. The high hydrothermal and chemical stability was proven in continuous measurements that lasted for periods of months to several years. The longest test, on the dehydration of n-butanol at 150 °C, lasted for 1000 days. The high stability parallels high fluxes and selectivities that meet current industrial demands and expectations. After a period of stabilization, fluxes and selectivities become constant. The presented results show that HybSi ® membranes are widely applicable in the dehydration of organic solvents by pervaporation.
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