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Treatment of water-soluble dye or optical brightener, used for dyeing or optical brightening of natural or synthetic material, especially paper, uses superheated or saturated steam in pressure filtration of aqueous synthesis suspension
Treatment of water-soluble dye or optical brightener, used for dyeing or optical brightening of natural or synthetic material, especially paper, uses superheated or saturated steam in pressure filtration of aqueous synthesis suspension
In the production of water-soluble dye and/or optical brightener compound(s) (A), an aqueous suspension containing (A), with a water solubility of over 0.1, preferably over 1, especially over 5 g/l at 20 [deg] C, is subjected to steam pressure filtration with superheated or saturated steam at the end of chemical synthesis.
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机译：在制备水溶性染料和/或荧光增白剂化合物（A）时，含有（A）的水悬浮液在20 [时]的水溶性超过0.1，优选超过1，特别是超过5 g / l。在化学合成结束时，用过热的或饱和的蒸汽对100℃进行蒸汽压力过滤。
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