A kind of preparation technology of salt-free dye without waste water discharge
A preparation process, a technology for salt-free dyes, applied in the direction of organic dyes, etc., can solve the problems of large water consumption, difficulty in desalination, and low content of inorganic salt ions in the nanofiltration process, and achieve green environmental protection, low energy consumption, and high economic feasibility. , the effect of high recycling rate
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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 reactive yellow P-6GS comes from Zhejiang Runtu Co., Ltd. The dye content of reactive bright yellow P-6GS is 65%. Mix 8 kg of crude reactive bright yellow P-6GS dye with 82 kg of deionized water to dissolve, and use ion chromatography to detect, among them: The content is 8235ppm, Cl - The content is 26478 ppm, 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 filtrate was collected.
[0033] The filtered filtrate is transferred to the nanofiltration I process equipment with a molecular weight cutoff of 800D for cyclic desalination (pressure 0.5MPa), during which pure water is continuously added, and the circulating...
Embodiment 2
[0045] The crude product of Reactive Red 218 dye solid, in which the content of Reactive Red 218 dye 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 crude Reactive Red 218 dye used was from Zhejiang Runtu Co., Ltd.
[0046] Dissolve 5 kg of the crude dye reactive red 218 with 45 kg of deionized water, and use ion chromatography to detect: The content is 9473ppm, Cl - The content is 28784ppm. The crude dye content in the crude slurry aqueous solution is 10%.
[0047] Filter 50 kg of the above crude dye aqueous solution using an ultrafiltration membrane with a molecular weight cutoff of 5000D, collect the filtrate, and collect about 49 kg of the filtrate.
[0048] The filtered filtrate is transferred to a nanofiltration I process equipment with a molecular weight cut-off of 800D for cyclic desalination (pressure 0.5MPa), duri...
Embodiment 3
[0061] Crude acid blue 86 dye solid product, in which the content of acid blue 86 dye 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 crude solid acid blue 86 dye used was from Zhejiang Runtu Co., Ltd.
[0062] Dissolve 5 kg of crude acid blue 86 dyestuff with 75 kg of deionized water, and use ion chromatography to detect: 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 cutoff of 5000D, and about 79 kg of filtrate was collected.
[0064] The filtered filtrate is transferred to the nanofiltration I process equipment with a molecular weight cut-off of 800D for cyclic desalination (pressure 0.5MPa), during which pure water is continuously added, th...
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