Sewage discharge free reparation method of salt-free dye
A preparation process, a technology of salt-free dyes, applied in the direction of organic dyes, etc., can solve the problems of large water consumption, low content of inorganic salt ions, and difficulty in desalination in the nanofiltration process, and achieve green environmental protection, low energy consumption, and high recycling rate. , high economic feasibility
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Embodiment 1
[0030] The reverse osmosis membrane, ultrafiltration membrane, nanofiltration membrane and membrane equipment used in this experiment were all purchased from Zhejiang Saite Membrane Technology Co., Ltd.
[0031] The crude product of Reactive Bright Yellow P-6GS comes from Zhejiang Runtu Co., Ltd., and the dye content of Reactive Bright Yellow P-6GS is 65%. Mix and dissolve 8kg of active bright yellow P-6GS dye crude product with 82kg deionized water, and detect by ion chromatography, wherein: The content is 8235ppm, Cl - The content is 26478ppm, and the crude dye content in the crude slurry aqueous solution is 8.9%.
[0032] The above solution was filtered using an ultrafiltration membrane with a molecular weight cut off of 5000D, and 89 kg of the filtrate was collected.
[0033] Transfer the filtered filtrate to the nanofiltration I process equipment with a molecular weight cut-off of 800D for circulating desalination (pressure 0.5MPa), during which pure water is continuou...
Embodiment 2
[0045] Reactive red 218 dye solid crude product, wherein the reactive red 218 dye content is 72%. The reverse osmosis membrane, ultrafiltration membrane, nanofiltration membrane and membrane equipment used in this experiment were all purchased from Zhejiang Saite Membrane Technology Co., Ltd. The solid crude reactive red 218 dye used was from Zhejiang Runtu Co., Ltd.
[0046] Mix and dissolve 5kg of dye reactive red 218 crude product with 45kg deionized water, and adopt ion chromatography to detect wherein: The content is 9473ppm, Cl - The content is 28784ppm. The crude dye content in the crude slurry aqueous solution is 10%.
[0047] 50 kg of the above-mentioned crude dye aqueous solution was filtered using an ultrafiltration membrane with a molecular weight cut-off of 5000 D, and the filtrate was collected, and about 49 kg of the filtrate was collected.
[0048] The filtered filtrate is transferred to the nanofiltration I process equipment with a molecular weight cut-of...
Embodiment 3
[0061] Acid blue 86 dye solid crude product, wherein acid blue 86 dye content is 55%. The reverse osmosis membrane, ultrafiltration membrane, nanofiltration membrane and membrane equipment used in this experiment were all purchased from Zhejiang Saite Membrane Technology Co., Ltd. The solid crude acid blue 86 dye used was from Zhejiang Runtu Co., Ltd.
[0062] Acid blue 86 dye crude product 5kg is mixed and dissolved with 75kg deionized water, adopts ion chromatography to detect wherein: The content is 6793ppm, Cl - The content is 18847ppm. The crude dye content in the crude slurry aqueous solution is 6.3%.
[0063] 80 kg of the above solution was filtered using an ultrafiltration membrane with a molecular weight cut-off of 5000 D, and about 79 kg of the filtrate was collected.
[0064] The filtered filtrate is transferred to the nanofiltration I process equipment with a molecular weight cut-off of 800D for circulating desalination (at a pressure of 0.5 MPa), during which...
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