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<p>Prehydrolysis/soda–anthraquinone (AQ) cooking has emerged as a promising strategy for the production of high-purity cellulose; however, optimization of the prehydrolysis stage is still required. In this study, monopersulfuric acid (MPS) was evaluated as a prehydrolysis reagent for the production of cellulose from Japanese cedar (<i>Cryptomeria japonica</i>) via prehydrolysis/soda–AQ cooking and compared with sulfuric acid (H<sub>2</sub>SO<sub>4</sub>) under equivalent acid dosages. At high acid dosage, MPS-treated wood showed lower residue yield than H<sub>2</sub>SO<sub>4</sub>-treated wood, whereas H<sub>2</sub>SO<sub>4</sub> treatment resulted in higher Klason lignin content after prehydrolysis. Nitrobenzene oxidation further confirmed lower vanillin yields in H<sub>2</sub>SO<sub>4</sub>-treated wood than in MPS-treated wood, indicating that lignin condensation was suppressed when MPS was used for prehydrolysis. Sugar analysis of the prehydrolysis liquor (PHL) showed that at low H<sub>2</sub>SO<sub>4</sub> dosage (4.8%), MPS and H<sub>2</sub>SO<sub>4</sub> treatments afforded comparable untreated total sugar contents. However, at high dosage (≥ 24%), the untreated total sugar content was lower in MPS-treated PHL, suggesting oxidative transformation or degradation of released carbohydrates. When soda–AQ cooking was conducted after MPS treatment, the resulting pulp showed lower kappa number, improved oxygen-bleaching response, and higher brightness of the final totally chlorine-free (TCF) bleached pulp (83.0% ISO) compared with soda–AQ cooking performed after H<sub>2</sub>SO<sub>4</sub> treatment or without prehydrolysis. However, the brightness differences among the pulps became smaller after the subsequent TCF bleaching sequence, despite the higher brightness of MPS/soda–AQ pulp after oxygen bleaching. Although pulp viscosity did not reach dissolving-pulp grade specifications, the bleached pulp exhibited high glucan purity (≈96%) indicating applicability for high-purity cellulose applications. Overall, the results demonstrate that MPS/soda–AQ is a viable, sulfide-free and chlorine-free route for obtaining cellulose with high glucan content from Japanese cedar. These findings position MPS/soda–AQ cooking as a new biorefinery process for producing high-purity cellulose streams rather than conventional dissolving pulp for advanced material applications from domestic softwood resources in Japan.</p>

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Comparison of monopersulfuric acid and sulfuric acid as prehydrolysis reagents for high-purity cellulose production from Japanese cedar via soda–anthraquinone (soda–AQ) cooking and totally chlorine-free (TCF) bleaching

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  • 发表日期：

    2026年6月1日

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  • Keishi Tanifuji,
  • Shiho Takahashi

摘要

Prehydrolysis/soda–anthraquinone (AQ) cooking has emerged as a promising strategy for the production of high-purity cellulose; however, optimization of the prehydrolysis stage is still required. In this study, monopersulfuric acid (MPS) was evaluated as a prehydrolysis reagent for the production of cellulose from Japanese cedar (Cryptomeria japonica) via prehydrolysis/soda–AQ cooking and compared with sulfuric acid (H2SO4) under equivalent acid dosages. At high acid dosage, MPS-treated wood showed lower residue yield than H2SO4-treated wood, whereas H2SO4 treatment resulted in higher Klason lignin content after prehydrolysis. Nitrobenzene oxidation further confirmed lower vanillin yields in H2SO4-treated wood than in MPS-treated wood, indicating that lignin condensation was suppressed when MPS was used for prehydrolysis. Sugar analysis of the prehydrolysis liquor (PHL) showed that at low H2SO4 dosage (4.8%), MPS and H2SO4 treatments afforded comparable untreated total sugar contents. However, at high dosage (≥ 24%), the untreated total sugar content was lower in MPS-treated PHL, suggesting oxidative transformation or degradation of released carbohydrates. When soda–AQ cooking was conducted after MPS treatment, the resulting pulp showed lower kappa number, improved oxygen-bleaching response, and higher brightness of the final totally chlorine-free (TCF) bleached pulp (83.0% ISO) compared with soda–AQ cooking performed after H2SO4 treatment or without prehydrolysis. However, the brightness differences among the pulps became smaller after the subsequent TCF bleaching sequence, despite the higher brightness of MPS/soda–AQ pulp after oxygen bleaching. Although pulp viscosity did not reach dissolving-pulp grade specifications, the bleached pulp exhibited high glucan purity (≈96%) indicating applicability for high-purity cellulose applications. Overall, the results demonstrate that MPS/soda–AQ is a viable, sulfide-free and chlorine-free route for obtaining cellulose with high glucan content from Japanese cedar. These findings position MPS/soda–AQ cooking as a new biorefinery process for producing high-purity cellulose streams rather than conventional dissolving pulp for advanced material applications from domestic softwood resources in Japan.