Stilbene optical brighteners are produced at CIBA-GEIGY in the Mclntosh, Alabama, plant. In producing 4, 4’diaminostilbene-2, 2’disulfonic acid, a major intermediate in the production of these brighteners, a large volume of discharges was generated. These discharges were reduced significantly by a number of process improvements consisting of a yield improvement, reducing the volume of an inert non-recoverable solvent and by replacing a Bechamps iron reduction with a catalytic hydrogenation.
Waste Reduction by Process Improvement in the Brightener Intermediates Production
S. E. Sadek, J. G. Lee, R. B. Lund, W. W. McConnell; Waste Reduction by Process Improvement in the Brightener Intermediates Production. Water Sci Technol 1 July 1992; 26 (1-2): 309–317. doi: https://doi.org/10.2166/wst.1992.0411
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