Torrefaction refers to the thermal and chemical treatment of organic substances (at atmospheric pressure, between 200–300°C, under inert conditions). The objective of this study is to torrefy the rice husk of Ethiopian origin, after a pretreatment with dilute sulfuric acid in order to enhance its energy density. The torrefaction temperature, holding time, and acid concentration investigated in this study were (200, 250, and 300°C), (20, 40, and 60 min) and (0.75, 1.50, and 2.25 g/L), respectively. Box-Behnken experimental Design (BBD) was applied for optimization using Design-Expert ® Version 7 software (Stat-Ease Inc., Minnesota, United States).

中文翻译：

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稻壳焙烤提高能量含量的研究。

烘焙是指对有机物质的热处理和化学处理（在惰性条件下，在大气压下，介于200–300°C之间）。这项研究的目的是在经过稀硫酸预处理以提高其能量密度之后，将埃塞俄比亚产的稻壳进行焙炒。在这项研究中研究的烘焙温度，保持时间和酸浓度分别为（200、250和300°C），（20、40和60分钟）和（0.75、1.50和2.25 g / L）。使用Design-Expert®版本7软件（美国明尼苏达州Stat-Ease Inc.）将Box-Behnken实验设计（BBD）应用于优化。