Abstract Lab-scale experiments were carried out to investigate a new approach of preparing biochar-based catalyst for transesterification reaction. Black liquor (BL) from cotton pulping process was used as a precursor for preparing the catalyst via spray drying followed by fast carbonization in a fluidized bed reactor. Response surface methodology (RSM) was employed to statistically analyze and optimize the entire process of catalytic synthesis of biodiesel from a waste frying oil, consisted of the catalyst preparation and transesterification steps. Several major operation parameters of the biodiesel synthesis process, including alkaline loading in biochar, methanol to oil ratio, catalyst loading, and the carbonization temperature of catalyst, were studied for their effects on biodiesel conversion. The optimal condition for achieving the maximum biodiesel conversion (i.e. 91.5 %) was found to be: 27 wt% alkaline loading in biochar, 600 °C carbonization temperature, 7.7 methanol to oil ratio, and 6.5 wt% catalyst loading. Overall, the spry drying fluidized bed carbonization demonstrated its viability for significantly reducing duration of high temperature carbonization, opening up the prospects of manufacturing the catalyst in a much less energy consumption manor.

中文翻译：

---

黑液喷雾干燥流化床碳酸化制备生物柴油合成生物炭催化剂

摘要 通过实验室规模的实验研究了一种制备用于酯交换反应的生物炭基催化剂的新方法。来自棉花制浆过程的黑液 (BL) 用作前体，通过喷雾干燥然后在流化床反应器中快速碳化制备催化剂。采用响应面法（RSM）对废煎炸油催化合成生物柴油的整个过程进行统计分析和优化，包括催化剂制备和酯交换步骤。研究了生物柴油合成过程的几个主要操作参数，包括生物炭中的碱负载量、甲醇油比、催化剂负载量和催化剂的碳化温度，研究了它们对生物柴油转化率的影响。发现实现最大生物柴油转化率（即 91.5%）的最佳条件是：生物炭中碱性负载量为 27%，碳化温度为 600°C，甲醇油比为 7.7，催化剂负载量为 6.5%。总体而言，喷雾干燥流化床碳化证明了其显着缩短高温碳化持续时间的可行性，开辟了以更低能耗制造催化剂的前景。