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Ye, Wenyuan; Lin, Jiuyang; Borrego, Ricard; Chen, Dong; Sotto, Arcadio; Luis, Patricia; Liu, Minghua; Zhao, Shuaifei; Tang, Chuyang Y.; Van der Bruggen, Bart
Separation and purification technology, 05/2018, Letnik: 197Journal Article
Display omitted •Loose NF membrane is successfully applied in dye purification for digital ink-jet printing.•Loose NF membrane yields a high rejection (>97.2%) for 2 reactive dyes and 4 cationic dyes.•Integrated diafiltration process by loose NF membrane removes 99.3% of NaCl with 5 diavolumes. In digital printing, a high salt content in dye solutions is detrimental, which calls for effective strategy for dye/salt fractionation. In this study, a loose nanofiltration (NF) membrane Sepro 2A was employed to desalinate diverse dye species (2 reactive dyes and 4 cationic dyes). This membrane, with a molecular weight cutoff of 490 Da, showed consistently high rejections to all the reactive and cationic dyes (>97.7%). Operational conditions such as dye concentrations and applied pressures have limited effects on the rejection of the membrane. An integrated NF-diafiltration process, involving a pre-concentration and a diafiltration step, was specifically designed for the fractionation of dye/NaCl mixtures. This loose NF membrane showed >99.7% rejection to reactive dyes (reactive blue 2 and reactive orange 16) and ca. 99.3% salt removal with ca. 2.0% dye loss after 5.0 diavolumes. However, the NF membrane experienced a 15.9% loss to methylene blue due to the lower rejection to this model cationic dye (97.2%). The current study provides important insights into dye/salt fractionation by loose NF membranes for digital ink-jet printing.
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