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Another non-oxygen-delignified eucalyptus kraft pulp of KN 13 was received after the extended cooking from a different pulp mill (pulp B). The assays were performed with both lab-washed (carryover-free) and unwashed (carryover-rich) pulps. Both lab-washed and unwashed pulps with carryover were subjected to X treatment, the former being demonstrating considerably higher ClO<jats:sub>2<\/jats:sub> savings than the pulps containing carryover. The savings of bleaching reagents were higher when the X stage was applied to the A1 pulp than to the A2 pulp. This advantage of A1 pulp, however, was not confirmed when using unwashed pulps. In contrast, the gains obtained from the X treatment of unwashed pulp A2 were practically as high as those observed for the lab-washed A2 pulp. Furthermore, a similar effect in X stage was recorded for unwashed pulps having close KN: oxygen-delignified A2 pulp and non-oxygen-delignified B pulp. The results suggest that pulp carryover and initial pH were the key factors relating to the effectiveness of X treatment. The application of X treatment to the A2 unwashed pulp (after the oxygen stage) not only saved 20% of the ClO<jats:sub>2<\/jats:sub> and 10% of the sodium hydroxide, but also improved the brightness stability of the bleached pulp without affecting its papermaking properties.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Key points<\/jats:title>\n            <jats:p>\u2022 <jats:italic>Xylanase treatment boosts kraft pulp bleaching<\/jats:italic>\n            <\/jats:p>\n            <jats:p>\u2022 <jats:italic>Pulp carryover hinders the xylanase treatment<\/jats:italic>\n            <\/jats:p>\n            <jats:p>\u2022 <jats:italic>Nearly 20% of ClO2 and 10% NaOH savings can be reached using xylanase<\/jats:italic>\n            <\/jats:p>\n          <\/jats:sec>","DOI":"10.1007\/s00253-024-13027-3","type":"journal-article","created":{"date-parts":[[2024,2,15]],"date-time":"2024-02-15T03:02:21Z","timestamp":1707966141000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Xylanase treatment of eucalypt kraft pulps: effect of carryover"],"prefix":"10.1007","volume":"108","author":[{"given":"Jos\u00e9 M. 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