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Efficient sugar production from sugarcane bagasse by microwave assisted acid and alkali pretreatment

机译：微波辅助酸碱预处理从甘蔗渣中高效制糖

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摘要

Sugarcane bagasse represents one of the best potential feedstocks for the production of second generation bioethanol. The most efficient method to produce fermentable sugars is by enzymatic hydrolysis, assisted by thermochemical pretreatments. Previous research was focused on conventional heating pretreatment and the pretreated biomass residue characteristics. In this work, microwave energy is applied to facilitate sodium hydroxide (NaOH) and sulphuric acid (H_2SO_4) pretreatments on sugarcane bagasse and the efficiency of sugar production was evaluated on the soluble sugars released during pretreatment. The results show that microwave assisted pretreatment was more efficient than conventional heating pretreatment and it gave rise to 4 times higher reducing sugar release by using 5.7 times less pretreatment time. It is highlighted that enrichment of xylose and glucose can be tuned by changing pretreatment media (NaOH/H_2SO_4) and holding time. SEM study shows significant delignifi-cation effect of NaOH pretreatment suggesting a possible improved enzymatic hydrolysis process. However, severe acid conditions should be avoided (long holding time or high acid concentration) under microwave heating conditions. It led to biomass carbonization, reducing sugar production and forming 'humins'. Overall, in comparison with conventional pretreatment, microwave assisted pretreatment removed significant amount of hemicellulose and lignin and led to high amount of sugar production during pretreatment process, suggesting microwave heating pretreatment is an effective and efficient pretreatment method.
机译：甘蔗渣代表了生产第二代生物乙醇的最佳潜在原料之一。生产可发酵糖的最有效方法是酶水解，辅以热化学预处理。先前的研究集中在常规加热预处理和预处理的生物质残留特征上。在这项工作中，微波能量被应用到甘蔗渣上促进氢氧化钠（NaOH）和硫酸（H_2SO_4）的预处理，并评估了预处理过程中释放的可溶性糖的产糖效率。结果表明，微波辅助预处理比常规加热预处理更有效，并且通过减少5.7倍的预处理时间，其还原糖释放量提高了4倍。需要强调的是，可以通过改变预处理介质（NaOH / H_2SO_4）和保持时间来调节木糖和葡萄糖的富集。 SEM研究表明，NaOH预处理具有明显的脱木素作用，表明可能会改善酶促水解过程。但是，在微波加热条件下，应避免使用强酸条件（长时间保持或高酸浓度）。它导致了生物质的碳化，减少了糖的产生并形成了“腐殖质”。总体而言，与常规预处理相比，微波辅助预处理可去除大量的半纤维素和木质素，并在预处理过程中导致大量糖分的产生，这表明微波加热预处理是一种有效的高效预处理方法。

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  • 来源
    《Biomass & bioenergy》 |2016年第10期|269-278|共10页
  • 作者

    Zongyuan Zhu; Camila Alves Rezende; Rachael Simister; Simon J. McQueen-Mason; Duncan J. Macquarrie; Igor Polikarpov; Leonardo D. Gomez;

  • 作者单位

    Green Chemistry Centre of Excellence, Chemistry Department, University of York, Heslington, York, YO10 5DD, United Kingdom;

    Institute of Chemistry, University of Campinas, UNICAMP, P. O. Box 6154, 13084-971, Campinas, Sao Paulo, Brazil;

    CNAP, Department of Biology, University of York, York, Heslington, YO10 5DD, United Kingdom;

    CNAP, Department of Biology, University of York, York, Heslington, YO10 5DD, United Kingdom;

    Green Chemistry Centre of Excellence, Chemistry Department, University of York, Heslington, York, YO10 5DD, United Kingdom;

    Instituto de Fisica de Sao Carlos, Universidade de Sao Paulo/USP, Av. Trabalhador sao-carlense, 400 Pq. Arnold Schimidt, 13566-590, Sao Carlos, Sao Paulo, Brazil;

    CNAP, Department of Biology, University of York, York, Heslington, YO10 5DD, United Kingdom;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Sugarcane bagasse; Microwave pretreatment; Sulphuric acid; Sodium hydroxide; Second generation bioethanol;

    机译：甘蔗渣;微波预处理;硫酸;氢氧化钠;第二代生物乙醇;

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