contact acid

Double contact acid plants are able to achieve a higher conversion rate of sulphur dioxide in the process off-gas to sulphuric acid, than single contact acid plants.

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But it was William Wollaston's process that rendered 'malleable' platinum available in quantities large enough for crucibles in which to concentrate lead chamber sulphuric acid, later to be superseded by contact acid made with the aid of a platinum catalyst.

Converter gas effluents and, at some smelters, roaster gas effluents are treated in single contact acid plants (SCAP) or double contact acid plants (DCAP) for SO2 removal.