Pervaporação pressurizada

AUTOR(ES)

Dario Windmoller

DATA DE PUBLICAÇÃO

1991

RESUMO

This thesis reports on pure liquid and solution pervaporation experiments, in which the feed is kept at 0,3 to 1,4 MPa pressure. Silicone rubber flat membranes made of RTV resin were used throughout. The preparation of a new type of silicone membranes displaying an asymmetric structure is also described. Pervaporation experiments were performed using a steel cell made of two compartments, separated by a rigid membrane holder. Temperatures were both above and below the feed liquid boiling temperature (at room pressure). Ethanol, acetone and aqueous ethanol pervaporation fluxes are up to 40-fold greater above than below their boiling temperatures. At lower temperatures, pervaporation permeate flux increases with pressure, linearly. At higher temperatures, feed pressure has a small, negative effect on permeate flux. Water-ethanol separation factors are independent of the temperature. This means, high volumetric output gains may be obtained by increasing the temperature, without loss in the quality of the permeate. Ethanol recovery from dilute solutions requires less pervaporation steps than the corresponding number of distillation theoretical plates.

ASSUNTO(S)

destilação separação de membrana

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