PRODUCTION OF ANTIOXIDANTS FOR BIODIESEL FROM STRAW BLACK LIQUOR DEPOLYMERIZATION

Energy and Sustainability VIII Pub Date : 2019-09-10 DOI:10.2495/ESUS190091

J. Palomo, Samuel Moles, J. Salafranca, Noemí Gil-Lalaguna, A. Gonzalo, J. Sánchez

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引用次数: 2

Abstract

Black liquor produced from semi-chemical pulping of barley straw has been depolymerized at different temperatures (250 to 325ºC), times (1 to 3 h) and initial solids content in the black liquor (7 to 14%). The obtained degraded and soluble lignin was then used as biodiesel stabilizer (against oxidation). The depolymerization products have been analyzed by gel permeation chromatography, gas chromatography-mass spectrometry (GC-MS), Fourier-transform infrared spectroscopy (FTIR), and phenolic content was quantified by using the Folin–Ciocalteu method. Regarding the molecular weight distribution, temperature and time have been the most influential factors, especially temperature, which decreased the observed molecular weight. The presence of volatile phenolic compounds has been determined by GC-MS. Temperature was found to be the most influential factor: the higher the temperature, the lower the concentration of volatile phenolics. Regarding the FTIR, the measured spectra hardly change when modifying the experimental conditions. Oxidation stability of biodiesel increased with the reaction temperature applied to black liquor, suggesting that the increase of oxidation stability is not only caused by the volatile phenolic compounds.

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秸秆黑液解聚制备生物柴油抗氧化剂

对大麦秸秆半化学制浆所得黑液进行了不同温度(250 ~ 325℃)、次数(1 ~ 3h)和黑液初始固含量(7 ~ 14%)的解聚。得到的降解和可溶性木质素被用作生物柴油的稳定剂(抗氧化)。用凝胶渗透色谱、气相色谱-质谱联用(GC-MS)、傅里叶变换红外光谱(FTIR)对解聚产物进行分析，用Folin-Ciocalteu法测定酚含量。在分子量分布方面，温度和时间是影响最大的因素，尤其是温度降低了观察到的分子量。采用气相色谱-质谱法测定了挥发性酚类化合物的存在。温度是最重要的影响因素，温度越高，挥发性酚类物质的浓度越低。对于FTIR，在改变实验条件时，测量光谱几乎没有变化。随着黑液反应温度的升高，生物柴油的氧化稳定性提高，说明氧化稳定性的提高不仅仅是由挥发性酚类化合物引起的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Energy and Sustainability VIII

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