Addition of Ascorbic Acid or Purified Kraft Lignin in Pulp Refining: Effects on Chemical Characteristics, Handsheet Properties, and Thermal Stability

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Abstract

The effects of two pulp pretreatments, impregnation with ascorbic acid (AA) or purified kraft lignin (KL), on bleached pulp refining were investigated by examining and testing handsheets made from these pulps. The AA pretreatment of the pulp amplified the depolymerization of the cellulose and notably impaired the strength properties of the pulp handsheets. The effects were enhanced upon the combination of the AA pretreatment and intensive refining. Furthermore, heat treatments (at 225 degrees C, 30 min, in water vapor atmospheres of 1 and 75% (v/v)) promoted the depolymerization of cellulose and the total color difference in the AA impregnated handsheets more than for the KL impregnated and reference handsheets. In contrast to AA, the KL pretreatment of the pulp improved the burst index stability of the refined pulp handsheets after the humid thermal treatment (75% (v/v)). In addition, the total color difference of the KL impregnated handsheets was lower than the AA impregnated and reference handsheets.

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Original languageEnglish
Pages (from-to)1808-1827
Number of pages20
JournalBioResources
Volume11
Issue number1
Publication statusPublished - Feb 2016
MoE publication typeA1 Journal article-refereed

    Research areas

  • Ascorbic acid, DP, Lignin, Pulp, Radical scavenger, Refining, Thermal degradation, UVRR, XPS, HIGH-YIELD PULPS, MECHANICAL PULPS, BRIGHTNESS REVERSION, SURFACE-CHEMISTRY, RESIDUAL LIGNIN, CELLULOSE FIBER, PAPER, DEGRADATION, ANTIOXIDANT, WOOD

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