Hybrid Pervaporation membrane up to 150° C

The hybrid silica membrane is developed within a STW program of the Dutch Government, in co-operation with the Universities of Amsterdam and Twente and ECN, together with several industry partners. The membrane is calles Hybsi, see also Hybsi.com.

Currently Pervatech is taking measures in production equipment, enabling supply of this membrane by the end of the year 2010 

The hybrid ceramic membrane for pervaporation is the third generation of ceramic membranes for pervaporation, most suitable at elevated temperatures:
- for processing in vapour phase at temperatures up to 150ºC
- in liquid phase at elevated pressure and temperature
- long term exposure at 150ºC is proven for about 3 year continuously indehydration of Butanol.

Because of the high temperature robustness this membrane is advantageously applied in vapor permeation mode. E.g. the feed is supplied to the membrane module as a vapor. Upon passing through the membrane module the water is removed from the feed stream by the membrane without a phase change of the feed from liquid to vapour. Hence, the process is run “isothermally”. No extra heat has to be supplied into the feed stream to let the water vapour pass through the membrane.

Some advantages are:

  • very high throughput because of the high temperature
  • no cooling down during dehydration because of the evaporation of the permeating component.
  • increase of selectivity, because the water vapour transport is strongly enhanced, whilst the organic transport through the membrane is more or less constant.
  • elimination of solids
  • reduction of required membrane surface area.

A possible way of processing involves feeding the top product of the distiller directly into the membrane section without condensation. Thus substantial energy savings can be realized.

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