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Application Of Membrane Separation Technology With Dye
May 28, 2018

Reactive dyes has industrialized production for over forty years, since it has bright color and synthesis is simple, convenient application, used excellent performance, etc, and is now the fastest-growing type of dye. Traditional reactive dye production process in the chemical synthesis of inorganic salt is added to dye slurry, use salting out effect to make the dye supersaturated precipitation, then the dye filtration beating, spray drying, the product is obtained.

In synthetic dyes, because of the complexity of the organic reaction, synthesis in addition to the finished product dye in the slurry, and a variety of dye isomer, homologue and incomplete reaction of raw and auxiliary materials. How to separation and purification in coarse slurry concentration dye to remove inorganic salt and vice dye separation at the same time, has always been a hot spot in the dye industry. Because of the presence of inorganic salt not only affects the stability of the dye, and lower the dye staining intensity and color fastness, while the existence of vice dye influence the final color of dye; The liquid products at the same time, the solid content is low, using spray drying energy consumption is too high.

Using membrane separation technology to deal with the advantages of the dye is as follows:

1, the removal of small molecules inorganic salt, and improve the dye strength of 40-60%;

2, replace the salting-out filter technology to reduce wastewater emissions, shorten the process;

3, save raw and auxiliary materials, recycling products;

4, improve the dye serous 20-30% solid content, reduce the cost of drying;

5, suitable for reactive dyes, acid dyes, direct dyes and whitening agent such as water soluble dyes.