Bipolar Membranes and Membrane Processes

H. Strathmann, University of Twente, The Netherlands Copyright © 2000 Academic Press

Bipolar membranes are gaining increasing attention as an efficient tool for the production of acids and bases from the corresponding salts by electrodialytic water dissociation. The process is economically very attractive and has a multitude of interesting potential applications. The large scale utilization of bipolar membranes, however, is still limited today by unsatisfactory membrane properties and by a lack of application know-how. A bipolar membrane should have adequate water dissociation capability, low electrical resistance, high permselectivity and a long useful life under operat ing conditions, which means that it must be stable in highly concentrated acid or alkaline solutions. The monopolar anion and cation exchange membranes which are also needed in the process should have good proton and hydroxide ion-blocking capability in addition to stability in strong bases and acids.

Although today's membranes do not meet all of these required properties, they are used successfully in a number of relevant applications.

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Solar Panel Basics

Global warming is a huge problem which will significantly affect every country in the world. Many people all over the world are trying to do whatever they can to help combat the effects of global warming. One of the ways that people can fight global warming is to reduce their dependence on non-renewable energy sources like oil and petroleum based products.

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