Alkaline sulphite anthraquinone pulping of caucasian spruce (Picea orientalis L.) chips with added sodium borohydride and ethanol

IF 0.8 4区农林科学 Q3 MATERIALS SCIENCE, PAPER & WOOD

Drewno Pub Date : 2015-01-01 DOI:10.12841/WOOD.1644-3985.067.07

E. Eri̇şi̇r, E. Gümüşkaya, H. Kirci, N. Misir

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引用次数: 5

Abstract

The study determined and compared the yield, viscosity, and chemical and physical properties of the pulps obtained as a result of Alkaline Sulfite–Anthraquinone (AS-AQ) pulping of Caucasian spruce wood with and without the addition of sodium borohydride (ASAB process) and ethanol (ASAE). It was found that the addition of ethanol to the AS-AQ pulping had a favourable influence on the screened yield and kappa number of the pulps. The addition of NaBH4 to the AS-AQ pulping in general also had a favourable influence on these pulps’ indices, provided that the amount added was not higher than 1–2% and the time of pulping was 180 mins. The higher yield of the ASAE pulps resulted from the higher retention of both cellulose and hemicelluloses, while the higher yield of ASAB pulps resulted from the higher retention of hemicelluloses and lignin. Regarding the AS-AQ pulping conditions, a distinct negative effect of modification on the viscosity of the pulps was observed in the case of the NaBH4 a additions to this pulping process. The viscosity reduction was, however, lower with extended pulping time. The static strength properties (tensile index and burst index) of the ASAB and ASAE pulps were in general lower than the AS-AQ pulps. In the case of the tear index, the tendency was similar. The addition of ethanol and especially NaBH4 to the AS-AQ pulping had a distinctly unfavourable influence on the whiteness and brightness of the pulps.

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添加硼氢化钠和乙醇的高加索云杉片碱性亚硫酸盐蒽醌制浆研究

本研究测定并比较了加硼氢化钠(ASAB工艺)和不加乙醇(ASAE)的高加索云杉碱亚硫酸盐-蒽醌(as - aq)制浆的产率、粘度、化学和物理性能。结果表明，在AS-AQ制浆过程中加入乙醇对制浆得率和kappa值的筛选有较好的影响。在AS-AQ制浆过程中，如果NaBH4的添加量不高于1-2%，制浆时间为180 min，则对这些纸浆的各项指标也有良好的影响。ASAE浆的产率较高是由于纤维素和半纤维素的保留率较高，而ASAB浆的产率较高是由于半纤维素和木质素的保留率较高。在AS-AQ制浆条件下，在该制浆过程中添加nabh4a的情况下，观察到改性对纸浆粘度的明显负面影响。然而，随着制浆时间的延长，粘度降低程度降低。ASAB和ASAE纸浆的静态强度(拉伸指数和破裂指数)普遍低于AS-AQ纸浆。在撕裂指数的情况下，趋势是相似的。乙醇，尤其是NaBH4的加入对AS-AQ浆的白度和亮度有明显的不利影响。

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来源期刊

Drewno MATERIALS SCIENCE, PAPER & WOOD-

CiteScore

1.10

自引率

12.50%

发文量

审稿时长

>12 weeks

期刊介绍： Wood. Research papers. Reports. Announcements" ("Drewno") is an international scientific journal that publishes original results of innovatory basic and applied research concerning technological, technical, economic and ecological issues important for the wood science and forest-based industries, including their environment, and interesting to the international recipients. "Drewno" is an Open Access biannual journal. Aims and scope: wood science: anatomy, biology, chemistry, physics wood mechanical and chemical technology, inter alia, sawmilling, composite wood products, wooden construction, furniture making, wood pulp, paper making material engineering, biocomposites, nanocomposites material management environmental protection, safety of the processes, products and working stations biotechnology bioenergy, biofuels forestry: harvesting and wood quality wood-based industries economics The Editorial Board of the journal especially welcomes articles concerning increase in wood resources (wood mobilisation); innovative composites and lignocellulosic materials; new trends in the protection, modification and finishing of wood; biorefining of raw wood material; "green" building; new technologies of wood waste recycling; sustainable development; innovation management; and business networks.