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Abstract

Methods of purifying ammonium products, such as ammonium sulfate, from an aqueous ammonium-containing process stream are described. The process stream may be a waste stream from an industrial process, such as from acrylonitrile production, for example. Such process streams typically contain a number of organic contaminants. The methods involve removing water from the process stream and then treating the process stream to oxidatively destroy the organic contaminants. In the described methods, the oxidant used is a strong acid, such as concentrated sulfuric acid. The acid is added at a concentration and rate that is effective at oxidatively removing the organic carbon in the stream while avoiding complications from competing side reactions. Once the process stream is sufficiently free of such contaminants, the ammonium products can be granulated.

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First Claim