Nanofiltration　(NF)　has　attracted　increasing　interest　for　dye　and　NaCl　fractionation　in　textile　industry.　However,　it　typically　shows　high　rejections　to　divalent　salts　(i.e.,　Na2SO4),　compromising　to　effectively　purify　dye　from　dye/Na2SO4　mixtures,　which　is　crucial　in　digital　ink-jet　printing.　This　study　used　a　tight　ceramic　ultrafiltration　(UF)　membrane　(MWCO　of　2410　Da)　to　desalinate　diverse　reactive　dye　species　with　molecular　weights　from　626.6　to　1205.4　Da.　The　UF　membrane　showed　considerably　high　rejections　to　all　the　reactive　dyes　(>　98.12%)　and　nearly　complete　salt　transmission　(rejections　<　0.1%　and　<　1.5%　with　60　g　L−1　NaCl　and　Na2SO4,　respectively).　Operational　conditions,　i.e.,　dye　concentration,　applied　pressure　and　salt　addition,　have　insignificant　impacts　on　the　dye　rejection,　due　to　dye　aggregation.　An　integrated　UF-diafiltration　process,　including　pre-concentration,　diafiltration　and　post-concentration,　was　designed　to　fractionate　reactive　dyes　and　Na2SO4.　The　model　dye,　reactive　blue　19,　can　be　concentrated　to　142.60　g　L−1　with　a　purity　of　99.83%　in　the　process,　since　low　salt　rejection　and　high　dye　retention　of　the　membrane　allows　for　99.88%　salt　removal　and　2.3%　dye　loss　after　ca.　9　diavolumes.　These　results　indicate　that　tight　ceramic　UF　membranes　have　high　potential　as　a　state-of-the-art　technology　in　reactive　dyes　and　Na2SO4　fractionation　for　digital　ink-jet　printing　applications.　©　2018　Elsevier　B.V.