SO2-alcohol-water (SAW) fractionation of Eldar pine (Pinus eldarica): effects of alcohol type on pulp and paper properties

IF 2.4 3区农林科学 Q1 FORESTRY European Journal of Wood and Wood Products Pub Date : 2024-02-04 DOI:10.1007/s00107-024-02051-9

Aliasghar Tatari, Mohammadreza Dehghani Firouzabadi, Ali Ghasemian

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Abstract

Generally, ethanol is the alcohol commonly used in the SO₂-alcohol-water (SAW) fractionation process. In this study, Eldar pine (Pinus eldarica) was fractionated with different alcohols (methanol, isopropanol, and 2-methyl-2-propanol, in comparison to ethanol) at 135 °C, duration (60–120 min.), and liquor composition (SO₂:alcohol:water = 12:44:44, w/w%) to achieve a consistent kappa number (∽25). The field emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR) were used to analyze the changes in physical and chemical structure characteristics of selected pulps. The use of isopropanol, as opposed to ethanol (common alcohol in SAW fractionation), showed a beneficial effect on the delignification rate. Meanwhile, both methanol and 2-methyl-2-propanol reduced the delignification rate. Moreover, isopropanol pulp required fewer beating revolutions to achieve a similar freeness (∽385 mL CSF) compared to other alcohols. Handsheets produced from isopropanol fractionation exhibited superior characteristics, including air permeability, apparent density, and tensile, tear, and burst indexes, when compared to those obtained from other alcohols. Overall, isopropanol is a highly suitable alternative to ethanol in SAW fractionation.

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埃达尔松（Pinus eldarica）的二氧化硫-酒精-水（SAW）分馏：酒精类型对纸浆和纸张性能的影响

一般来说，乙醇是二氧化硫-酒精-水（SAW）分馏过程中常用的酒精。在本研究中，埃达尔松（Pinus eldarica）在 135 °C、持续时间（60-120 分钟）和液体成分（SO2:酒精:水 = 12:44:44，w/w%）条件下使用不同的酒精（甲醇、异丙醇和 2-甲基-2-丙醇，与乙醇相比）进行分馏，以获得一致的卡帕数（∽25）。利用场发射扫描电子显微镜（FE-SEM）、X 射线衍射（XRD）和傅立叶变换红外光谱（FTIR）分析了所选纸浆的物理和化学结构特征的变化。与乙醇（SAW 分馏中常用的酒精）相比，异丙醇的使用对脱木质素率产生了有利影响。同时，甲醇和 2-甲基-2-丙醇都会降低脱木素率。此外，与其他醇类相比，异丙醇纸浆需要更少的打浆转数才能达到相似的自由度（∽385 mL CSF）。与其他醇类相比，异丙醇分馏生产的手板具有更优越的特性，包括透气性、表观密度、拉伸指数、撕裂指数和爆裂指数。总体而言，异丙醇是 SAW 分馏中乙醇的一种非常合适的替代品。

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来源期刊

European Journal of Wood and Wood Products 工程技术-材料科学：纸与木材

CiteScore

5.40

自引率

3.80%

发文量

124

审稿时长

6.0 months

期刊介绍： European Journal of Wood and Wood Products reports on original research and new developments in the field of wood and wood products and their biological, chemical, physical as well as mechanical and technological properties, processes and uses. Subjects range from roundwood to wood based products, composite materials and structural applications, with related jointing techniques. Moreover, it deals with wood as a chemical raw material, source of energy as well as with inter-disciplinary aspects of environmental assessment and international markets. European Journal of Wood and Wood Products aims at promoting international scientific communication and transfer of new technologies from research into practice.