Conversion of biomass into saleable biochemicals and fuels requires the use of a pretreatment to enable subsequent processing. Acid sulfite pulping is one of the most cost-effective strategies, because the chemicals are inexpensive and the technology is available on an industrial scale. It also allows the simultaneous production of cellulosic fibers and lignosulfonate. However, too little is known about the feasibility of acid sulfite pulping of tropical hardwoods. The objective of this research was to gain a better understanding of the response of Acacia mangium and Eucalyptus pellita in acid sulfite pulping. The plantation-grown hardwood chip samples were obtained from Sabah, Malaysia. The sulfite cooking experiments were carried out in autoclaves with temperatures of 130°C and 140°C and varied chemical charges. The results revealed that a cooking temperature of 140°C was needed to reach kappa numbers below 30, but this also resulted in much reduced fiber length and higher fines content than 130°C, probably due to the intensified acid hydrolysis. To reach kappa numbers below 20, more severe cooking conditions are needed. These results demonstrate that using A. mangium and E. pellita as feedstocks allows feasible production of chemical pulp and sulfonated lignin, which are intermediate products for biorefineries.

中文翻译：

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作为多产品生物精炼厂预处理方法的金合欢和柏树的酸性亚硫酸盐制浆

将生物质转化为可销售的生物化学品和燃料需要使用预处理以进行后续加工。酸性亚硫酸盐制浆是最具成本效益的策略之一，因为化学品价格低廉且该技术可用于工业规模。它还允许同时生产纤维素纤维和木质素磺酸盐。然而，对热带硬木酸性亚硫酸盐制浆的可行性知之甚少。这项研究的目的是更好地了解金合欢和桉树的反应在酸性亚硫酸盐制浆中。种植园种植的硬木片样品来自马来西亚沙巴。亚硫酸盐蒸煮实验在温度为 130°C 和 140°C 和不同化学物质的高压釜中进行。结果表明，要使卡伯值低于 30，需要 140°C 的蒸煮温度，但这也导致纤维长度大大减少，细粉含量高于 130°C，这可能是由于酸水解加剧。为了达到低于 20 的 kappa 值，需要更严格的烹饪条件。这些结果表明，使用A. mangium和E. pellita作为原料可以可行地生产化学纸浆和磺化木质素，它们是生物精炼厂的中间产品。