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16 巻, 1 号
選択された号の論文の10件中1～10を表示しています
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西 済1962 年 16 巻 1 号 p. 2
発行日: 1962/01/20
公開日: 2009/11/17
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太田 武雄1962 年 16 巻 1 号 p. 3
発行日: 1962/01/20
公開日: 2009/11/17
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福渡 七郎1962 年 16 巻 1 号 p. 4-8
発行日: 1962/01/20
公開日: 2009/11/17
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福田 祐作1962 年 16 巻 1 号 p. 9-15
発行日: 1962/01/20
公開日: 2010/02/10
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野村 順次1962 年 16 巻 1 号 p. 16-22
発行日: 1962/01/20
公開日: 2009/11/17
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(第3報) 広葉樹材にSivola蒸解法を適用した場合の収率増加の原因について沖 慎一, 角 祐一郎, 沢口 幸男, 軒原 栄三1962 年 16 巻 1 号 p. 23-30
発行日: 1962/01/20
公開日: 2010/02/10
ジャーナル フリーWhen the Sivola process was applied for the manufacturing of dissolving grade pulp from hardwoods, it was found by the present authors (unpublished) yield of the pulp was also higher than that by conventional process, as similar as found for the softwood. In this study, it was tried to clarify characteristics of the hardwoods in the Sivola pulping process and the reasons why the process gave higheryields. Conclusions of this study are as follows ;
(1) The principal reasons of the yield gain are due to pulping of screenings from the first stage sulfite cooking with the second stage alkaline digestion (Fig. 3), and alkaline digestion with a solution of sodium carbonate and sodium sulfite instead of a caustic solution in the second stage (Fig. 4).These are the same as in the case of softwood.
(2) Contrary to the case of soft wood, sulfite spent liquor presenting in the second stage had no effect on the yield gain in the case of hardwood (Fig. .4). This difference seems to be due to some special nature of the sulfite spent liquor from hardwoods and are under further investigation.
(3) Hardwoods are, in general, denser and more resistant to the penetration of cooking liquor thansoftwoods. Sodium-base in the first stage of the Sivola process contributes to a part of the yield gain, especially at the range of higher viscosity level of produced pulp (Fig. 1 and 2).抄録全体を表示PDF形式でダウンロード (1636K) -
(第4報) 広葉樹材に対するSivola蒸解法の2段目アルカリ蒸煮について沖 慎一, 軒原 栄三1962 年 16 巻 1 号 p. 31-41
発行日: 1962/01/20
公開日: 2009/11/17
ジャーナル フリーIt was previously reported by the present authors that, when the Sivola cooking process was applied for hardwoods, chlorine number of the pulp increased during the second alkaline stage of the processand the spent liquor of the first sulfite cooking stage had no effect on the yield gain of the produced pulp, contrary to the results in the case of softwoods. Some investigations were carried out on the above speciality of the sulfite spent liquor from hardwoods, and the obtained results are summarized as follows ;
(1) More sodium carbonate is needed for neutralization of the sulfite spent liquorof the hardwoods than the softwoods at the same level of residual sulfur dioxide content. This is due to some volatile (organic) acids in the spent liquor from the hardwoods because of less sodium carbonate in neutralization of the concentrated one. (Fig. 1, 2 and 3)
(2) If the unbleached sulfite pulp of the hardwoods is digested with an alkaline solution containing sulfite spent liquor of low sulfur dioxide content, the chlorine number of the digested pulp becomes higher (Tab. 1, Fig. 6 and 7) and refining effect on cellulose is also low (Fig. 8). Much residual sulfur dioxide content is necessary for the second alkaline digestion of hardwoodsin the Sivola process.
(3) In order to clarify the above increasing of chlorine number, it was investigated how lignosulfonates of the first stage spent liquors at different residual SO2 contents changed duringthe second alkaline stage. As seen from Tab. 2 and Fig. 4, there are no differences one another in the chemical and physical properties except their colors.
(4) The high chlorine number of pulp after digestion seems to be due to adsorptionof reacticn droducts from lignosulfonates and modified hemicelluloses in the sulfite spent liquor (Tab. 5).抄録全体を表示PDF形式でダウンロード (1869K) -
パルプ漂白機構の研究 第6報佐藤 孝一郎, 小林 晃夫, 三川 礼1962 年 16 巻 1 号 p. 42-47
発行日: 1962/01/20
公開日: 2010/02/10
ジャーナル フリーIn the previous papers, it was reported that the residual lignosulfonic acid in unbleached sulfite pulp (RLS) has about half as much sulfonic acid group as the ordinary lignosulfonic acid (LSA) and has no chemical bond with carbohydrate.
As this RLS was the lignin remained undissolved by cooking and subsequent refining of pulp, it was considered that there must exist any hinderance to dissolution because of the nature of the morphological structure of the cell wall and/or the higher degree of polymerisation of RLS than that of the LSA dissolved during the cooking.
In this paper, the comparison of the molecular weights and of the functional groups of RLS and LSA has been made in order to know the reasons of difficulty of the dissolution of RLS from the unbleached sulfite pulp.
The barium salts of LSA and RLS were fractionated into eight and six fractions respectively with ethanol by Schulz's method, and each fraction was analyzed as usual for methoxyl, sulfur, sulfur in sul-Ionic acid form, weakly acidic group, type I (guaiacyl type) phenolic hydroxl group, type II (condencedtype) phenolic hydroxyl group, total phenolic hydroxyl group and diffusion coefficient of each fraction was measured by McCarthy's method.
The degree of sulfonation of RLS was distributed from 0.25 ot 0.40 per methoxyl and of LSA was 0.40-40.55 per methoxyl.
Total phenolic hydroxyl group of RLS was 0.15-0.18 per methoxyl, being lower than that of LSA, and phenolic hydroxyl group of type I in RLS was 00.03 per methoxyl.
The somewhat surprising fact is that the several fractions of RLS have almost no phenolic hydroxl group of type I.
As diffusion coefficient of RLS measured by McCarthy's solution to gel method was about 3.8-5mm2/day and that of LSA was 6.528mm2/day, it will definitely be concluded that the molecular weight of RLS is higher than that of LSA.
Molecular weight estimated roughly using McCarthy's relation between molecular weight and diffusion coefficient was about 60000-110000 for RLS and about 4000-40000 for LSA.
It was thus confirmed that the reason for the difficulty of the dissolution of the RLS from the unbleached sulfite pulp may be due to too high molecular weight of the RLS to diffuse out from the cell wall.抄録全体を表示PDF形式でダウンロード (1351K) -
炭酸化亜硫酸化によるクラフトパルプ黒液中の薬品の挙動について木村 裕, 藤井 利郎, 赤松 勲, 村尾 安一1962 年 16 巻 1 号 p. 48-55
発行日: 1962/01/20
公開日: 2010/02/10
ジャーナル フリーThe additions of CO2 gas, SO2 gas to black liquor were studied for the manufacture of reproduced semichemical pulp cooking liquor from kraft pulp black liquor, by direct sulpliitation and carbonation sulphitation.
The results were found that cooking liquor can be successfully manufactured by selection of the conditions (temp., gas rate etc.) to reduce the Na2S2O3 formation, especially in the carbonation-sulphi tation.抄録全体を表示PDF形式でダウンロード (459K) -
角 実, 鈴木 富夫1962 年 16 巻 1 号 p. 56-62,68
発行日: 1962/01/20
公開日: 2009/11/17
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