Kinetics of the Formation of the Solid Lignosulphonic Acid (The First Stage Sulphonation in Sulphite Cooking) II

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  • NOKIHARA Eizo
    The Research Laboratory of the Kokusaku Pulp Industry Co., Ltd.

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Other Title
  • 固状リグノスルフォン酸生成(初期スルフォン化)反應の動力學的研究(其のII)
  • コジョウ リグノスルフオンサン セイセイ ショキ スルフオンカ ハンノウ ノ ドウリキガクテキ ケンキュウ 2 サルフアイト ジョウカイ ノ ケンキュウ 2
  • Studies on the Sulphite Cooking. Part 2
  • サルファイト蒸解の研究第2報

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Description

The kinetics of the formation of solid lignosulphonic acid (the sulphonation in the first stage of sulphite cooking) was carried out using the extracted spruce wood meal (100 mesh) and 12%Na2SO3+3%NaHSO3 solution (pH 6.3) as cooking liquor (liquor ratio 1:10) at 97°, 120° and 137°. From the analysis of the cooking results the sulphonation in the first stage of sulphite cooking are separated into two different sulphonation reactions. If they are treated separately, both of them can be treated strictly as the first order reaction. One reaction (X-reaction) is very fast, and the other (Z-reaction) is slow. The content of the active group (S-group) sulphonated in the first stage of sulphite cooking was 3.8% in lignin, if it were represented as sulphur content. S-group is separated into two groups; X- and Z-groups are sulphonated in X- and Z-reactions, respectively. Their contents are same; 1.90%. The activation energies (temperature coefficients per 10°C. in range 95°_??_135°) of X- and Z-reactions are 16.5 and 35 Cal (1.74 and 3.22), respectively. It is supposed that X-group is a bare active group in the lignin molecule, such as -OH in vanillyl alcohol, and Z-group is masked in some form, such as in weak linkage with carbohydrates.

Journal

  • Nippon Nōgeikagaku Kaishi

    Nippon Nōgeikagaku Kaishi 26 (5), 236-241, 1952

    Japan Society for Bioscience, Biotechnology, and Agrochemistry

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