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Generation of biofuels by slow pyrolysis of palm empty fruit bunches: Optimization of process variables and characterization of physical-chemical products
Biomass & Bioenergy ( IF 6 ) Pub Date : 2020-08-04 , DOI: 10.1016/j.biombioe.2020.105707
M.F.P. Ferreira , B.F.H. Oliveira , W.B.S. Pinheiro , N.F. Correa , L.F. França , N.F.P. Ribeiro

Residues of the palm oil agro-industry (palm empty fruit bunches - EFB) were pyrolysed to produce biofuels. Effects of several parameters on the slow pyrolysis process were evaluated using the central compound rotational design (DCCR) for modelling and optimization the process conditions aiming the maximum yield of bio-oil. After pyrolisis and using various approaches the products were characterized with emphasis on bio-oil. The response surface methodology and desirability function indicate that the temperature was the most influential parameter in regard to the liquid yield, in which the optimum pyrolysis conditions were: temperature of 628.2 °C and N2 flow rate of 0.259 L/min. The empirical relationships for the bio-gas, bio-oil, and bio-char were carried out from a second-order polynomial equation adequately describing the nonlinear behaviour of the experimental data with a precision of approximately 85%. Gas chromatography-mass spectrometry (GC-MS) and Fourier Transformer infrared (FTIR) analysis shows that bio-oil has a high content of oxygenated compounds with four main components: hexadecanoic acid methyl ester (25.57 area%), nonane (12.51 area%), n-hexadecanoic acid (10.66 area%) and phenol (10.13 area%). Moreover, high-performance thin-layer chromatography (HPTLC) analysis showed the bio-oil is very promising for biodiesel-based automotive additives preventing oxidation of the bis-allylic methylene groups and the consequent generation of free radicals. Biochar showed low yield (27.52%) but good energy capacity, with a calorific value of 19.27 MJ/kg. Regarding to gases production, CO2 and CH4 are the main compounds observed in optimized conditions suggestion its use like raw material in the energy production.



中文翻译:

通过棕榈空果串的缓慢热解生成生物燃料:工艺变量的优化和物理化学产品的表征

棕榈油农用工业的残渣(棕榈空果串-EFB)被热解以生产生物燃料。使用中央化合物旋转设计(DCCR)评估了几个参数对慢速热解过程的影响,该模型用于建模和优化旨在最大程度提高生物油产量的工艺条件。经过热解和使用各种方法后,对产品进行了表征,重点是生物油。响应面方法学和期望函数表明,温度是影响液体产率的最重要参数,其中最佳的热解条件是:温度为628.2°C和N 2流量为0.259 L / min。生物气体,生物油和生物炭的经验关系是通过二阶多项式方程式进行的,该方程式充分描述了实验数据的非线性行为,其精度约为85%。气相色谱-质谱(GC-MS)和傅立叶红外(FTIR)分析表明,生物油中氧化化合物的含量很高,主要有四个主要成分:十六烷酸甲酯(25.57面积%),壬烷(12.51面积%) ),正十六烷酸(10.66面积%)和苯酚(10.13面积%)。此外,高效薄层色谱(HPTLC)分析表明,该生物油对于基于生物柴油的汽车添加剂非常有希望,可防止双烯丙基亚甲基的氧化以及由此产生的自由基。Biochar产量低(27。52%),但能量容量良好,发热量为19.27 MJ / kg。关于气体生产,CO2和CH 4是在优化条件下观察到的主要化合物,这表明其在能源生产中的用途像原材料。

更新日期:2020-08-04
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