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Preyssler heteropolyacid H<jats:sub>14<\/jats:sub>[NaP<jats:sub>5<\/jats:sub>W<jats:sub>30<\/jats:sub>O<jats:sub>110<\/jats:sub>] and Montmorillonite\u2010based CLOI_CSP catalysts are identified as the most efficient ones, allowing the etherification to reach the <jats:italic>t<\/jats:italic>\u2010BMF\/HMF equilibrium faster (\u22481:1), thus promoting minimum side reactions. Further optimization of the batch experimental conditions, namely catalyst loading, temperature, HMF concentration, time, <jats:italic>t<\/jats:italic>\u2010BMF stability, and additives, allows the <jats:italic>t<\/jats:italic>\u2010BMF\/HMF equilibrium to be reached in less than 3\u2009h with outstanding selectivity &gt;95%. Under optimized conditions, CLOI_CSP is reused for four cycles without significant loss of efficiency. In addition, it exhibits high efficiency under flow conditions, allowing continuous production of <jats:italic>t<\/jats:italic>\u2010BMF up to 0.7\u2009g <jats:italic>t<\/jats:italic>\u2010BMF g<jats:sup>\u22121<\/jats:sup> catalyst\u2009min<jats:sup>\u22121<\/jats:sup> at high concentrations of HMF.<\/jats:p><\/jats:sec>","DOI":"10.1002\/ente.201900780","type":"journal-article","created":{"date-parts":[[2019,8,28]],"date-time":"2019-08-28T07:50:35Z","timestamp":1566978635000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["Efficient Continuous Production of the Biofuel Additive 5\u2010(<i>t\u2010<\/i>Butoxymethyl) Furfural from 5\u2010Hydroxymethylfurfural"],"prefix":"10.1002","volume":"7","author":[{"given":"Oscar H.","family":"Pardo Cuervo","sequence":"first","affiliation":[{"name":"Research Institute for Medicines (iMed.ULisboa) Faculty of Pharmacy Universidade de Lisboa  Av. 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