65 アカマツ材のパルプに関する研究(XVIII) : 酸性亞硫酸法蒸解並に中性亞硫酸法蒸解に及ぼす多価フエノールの影響(其の1)

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The antipulping effect of polyphenol in the acid sulphite cook was studied, and besides, the reaction of neutral sulphite pulping of the wood containing lignin previously combined with polyphenol was investigated. The polyphenol such as pinosylvin was substituted by phloroglucinol in this report.Main results are as follows : (1) Under the acidic condition, phloroglucinol combines with the lignin of wood in the proportion of about 126 to 900,namely, a mol to one of lignin-building unit.(2) Also the wood in which lignin was combined with phloroglucinol can be sulphonated by the Kullgren-cooking process, and its s/Lig. ratio becomes over 3.5 %. But its sulphonated lignin can not be removed by the acetic acid cooking. (3) When the pre-sulphonated wood is phenolated by the phloroglucinol solution, its solid lignosulphonic acid combines with the phenol and becomes completely insoluble.So, the reactive group of lignin which is also sulphonatable under the condition of high pH perhaps differs from the phenolatable group of lignin.(4) The wood in which lignin was combined with phloroglucinol can not be delignificated by the sulphite liquor with pH of about 6,but can be almost completely delignificated by the solution of Na_2SO_3 (pH≒9.8).(5) When the phenolated wood is cooked under the alkalic condition, the phloroglucinol which has been combined with the lignin in wood can be removed, probably by breaking the link between lignin and phloroglucinol. This phonomenon gives a good reason for the experimental results in (4).
一般社団法人日本森林学会の論文
1952-11-25

65 アカマツ材のパルプに関する研究(XVIII) : 酸性亞硫酸法蒸解並に中性亞硫酸法蒸解に及ぼす多価フエノールの影響(其の1)

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