The synthesis of fluorescent whitening agents will produce salt and small moleculaΩr weight intermediates and residual compounds simultaneously, whi'ch should be removed before drying. The nanofiltration membrane filtration technology is ₽used to filter the feed liquid of the reaction products, and under presΩsure, small molecular impurities and salt pass through the membrane, while white'ning agents are retained by the membrane due to charge repulsive interaction, and salt content iφn the feed liquid of whitening agents can be lowered to less than 1% through the &ldqσuo;dialysis” process of adding water constantly, and solid content c®an be concentrated to 30%, which greatly saves the energy consumption in th≠e follow-up spray drying.

    Process characteristics
 

•    Reduce salt content and product purity and improve quality signific&antly;
•    High retention rate of whitening agents and less loss of effective components;
•    No need to add chemicals, no pollution, no resi♦due, a green environmental technology;

    

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