Dye Exhibition in April – Exchange on Dye Concentration and Desalination Processes

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1. Dye concentration and desalination processes: Traditional process: Synthesis of dye – salting out – filtration – spray drying; Nanofiltration process: Synthesis of dye – nanofiltration membrane – spray drying. 2. Comparison of advantages and disadvantages between the nanofiltration process and the traditional process: ① Improvement in coloring quality； The salting-out process introduces a large amount of salt, affecting the coloring and consuming salt at the same time. ②Economic benefits ； The filtration process causes a loss of the main dye, with a loss rate exceeding 5%, resulting in significant economic losses. ③Energy saving ； The concentrated material is easier to dry, reducing the energy consumption required for drying. ④ Emission reduction ； The salting-out process involves the handling of large amounts of salt, while nanofiltration is more environmentally friendly. 3. Economic comparison: Based on a dye production capacity of 1,000 t/year, ① at least 2 t of salt is required per t of dye for salting-out; assuming the salt is sodium chloride, its market price is around 600 yuan per t, resulting in annual costs of approximately 1.2 million yuan. ②In the traditional filtration process, at least 5% of the main dye is lost, while in the nanofiltration process the loss is at most 1%. This results in a reduction of at least 4% per year, or 40 tons of dye lost. At a cost of 30,000 yuan per ton, the use of nanofiltration membranes can save 1.2 million yuan per year. ③There is membrane wear, and the membranes need to be replaced regularly. According to available information, the cost of membrane wear in dye production is around 600 yuan per ton; thus, the annual cost of replacing membranes amounts to 600,000 yuan. ④Economic benefits resulting from reduced emissions, improved quality, and energy savings. Production or technical personnel are welcome to engage in technical exchanges; QQ: 719610630, Phone: 13382551828. Images prove the truth. 2016-02-16 160724.jpg 2016-02-16 160955.jpg 2016-02-16 161138.jpg