60 アカマツ材のパルプに関する研究(XVII) : 亞硫酸蒸解反応について(其1)

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The sulphonation of lignin and the dissolution of sulphonated lignin in wood were experimentally studied by the process of the two-step cooking which involves pre-sulphonation cooking of wood, followed by the cooking of acids without sulphite and bisulphite ions. The lignosulphonic acids also were isolated from the waste liquor after cooking and their methoxyl group and sulphor content were determined.Main results are as follows : (1) When the pre-sulphonated wood in which the ratio of s/lig. is over about 3.5% is cooked with the acids without sulphite and bisulphite ions (pH 2.2) for 3 hrs. at 150℃, its lignin is almost removed.(2) The higher the pH of cooking acid liquor is, the less the removal rate of lignin becomes.(3) In the case of the Kullgren-sulphonation process, the ratio of s/lig. in wood at first reaches to 3.5-4.0% rapidly, then it increases very slowly, and it reaches to 6.7% at last (90 hrs. cooking). But, in the case of the ordinary sulphite acid process, the rapid increasing of the s/lig. ratio continues even after it has reached to 3.5-4.0%.(4) The lignin of highly sulphonated wood is more easily removed than that of lowly sulphonated one.(5) The ratio CH_3O-/S in lignosulphonic acid isolated from the waste liquor which is obtained by cooking the sulphonated wood with the acids without sulphite and bisulphite ions is 5.0,and the ratio in that from the waste liquor of the ordinary sulphite acid is 1.6 (6) When the lignosulphonic acid of which the CH_3O-/S ratio is 5.0 is further sulphonated.the ratio becomes to 2.5.
一般社団法人日本森林学会の論文
1952-10-25

60 アカマツ材のパルプに関する研究(XVII) : 亞硫酸蒸解反応について(其1)

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