HBS Pulping. 4. ECF Bleaching of HBS pulp and Thermo-Stabilization of HBS Solvents.

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  • Aorigele
    Laboratory of Wood Chemistry, Graduate School of Agriculture, Hokkaido University
  • Kajimoto Junko
    Laboratory of Wood Chemistry, Graduate School of Agriculture, Hokkaido University
  • Sano Yoshihiro
    Laboratory of Wood Chemistry, Graduate School of Agriculture, Hokkaido University

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Other Title
  • ＨＢＳパルプ化　４　　パルプのＥＣＦ漂白とＨＢＳ溶媒の熱安定性
  • HBS パルプカ 4 パルプ ノ ECF ヒョウハク ト HBS ヨウバイ ノ ネツ アンテイセイ
  • ECF Bleaching of HBS pulp and Thermo-Stabilization of HBS Solvents
  • パルプのECF 漂白とHBS 溶媒の熱安定性

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Description

Todomatsu (Abies sachalinensis Mast.) chips as softwood gave T-pulp with a Klason lignin (KL) content of 5.6% and a viscosity degree of 21.5 cP at a yield of 50.3% by HBS pulping with a mixture of 70% aqueous R-1, 3-and 1, 4-butanediol (as RHBS shown in Fig. 1) at 210°C for 3 h. Birch (Betula platpylla var. japonica Hara) chips were cooked with 80% RHBS at 180t for 3 h to give B-pulp with a KL content of 5.0% and a viscosity degree of 43.4 cP at a yield of 54.3%. Chinese reed gave R-pulp with KL and ash contents of 2.5 and 6.3% in a yield of 48.7%, when cooked with 80% RHBS at 200°C for 2 h. B-and R-pulps were fully bleached by ECF sequence with OD, and T-pulp with ODEPP. Bleached B-and T-pulps had TI of 12.4 and 17.6 mN· m2/g, indicating that TI of HBS pulp was remarkably improved by ECF bleaching. Seventy and 80% aqueous HBS such as 1, 3-and 1, 4-butanediol, propylene glycol and 1, 5-pentanediol were quantitatively recovered on heating at 190°C for 2 h, so they can be reused repeatedly as pulping solvents without distillation for purification and also with a little loss.

Journal

  • JAPAN TAPPI JOURNAL

    JAPAN TAPPI JOURNAL 56 (12), 1786-1792, 2002

    JAPAN TECHNICAL ASSOCIATION OF THE PULP AND PAPER INDUSTRY

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