ICI process recovers alkali from sodium sulphate wastes

Engineering contractor John Brown and ICI Chemicals & Polymers have joined forces to develop ICI's electrolytic process for the recovery of acid and alkali from waste streams containing sodium sulphate.

Developed by ICI's electrochemical technology business, the process is likely to generate interest in the pulp and paper, viscose and fine chemicals industries. In the viscose industry, for example, roughly one tonne of sodium sulphate waste is produced for every tonne of viscose rayon produced.

The process is an adaptation of ICI's established FM21 electrolyser technology which was introduced commercially in 1981.

According to ICI's

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