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Separative reactors for integrated production of bioethanol and biodiesel

机译:一体化生产生物乙醇和生物柴油的分离反应器

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Conventional integration of bioethanol and biodiesel plants employs the use of anhydrous ethanol in the biodiesel production process. The problem is that the production of anhydrous bioethanol is very energy-demanding, especially due to the azeotropic distillation required to producing high purity ethanol. The use of hydrous ethanol in the biodiesel production is preferable but unfeasible in conventional processes due to the equilibrium limitations and the economic penalties caused by the additional process steps. To solve this problem, this study proposes a novel energy-efficient integrated production of biodiesel from hydrous bioethanol. The key to success is a novel setup that combines the advantages of using solid catalysts with the integration of reaction and separation. This integrated process eliminates all typical catalyst-related operations, and efficiently uses the raw materials and the reactor volume in a separative reactor that allows significant savings in the capital and operating costs.rnRigorous simulations embedding experimental results were performed using computer aided process engineering tools - such as AspenTech Aspen Plus - to design the separative reactor and evaluate the overall technical feasibility of the process. The RD column was simulated using the rigorous RADFRAC unit with RateSep (rate-based) model, and explicitly considering three phases balances. Sensitivity analysis was used to determine the optimal range of the operating parameters. The main results are given for a plant producing 10 ktpy biodiesel (>99.9%wt) from hydrous bioethanol (96%wt) and waste vegetable oil with high free fatty acids content (~100%), using solid acids as green catalysts.
机译:生物乙醇和生物柴油工厂的常规整合在生物柴油生产过程中使用无水乙醇。问题在于,无水生物乙醇的生产非常耗能,特别是由于生产高纯度乙醇所需的共沸蒸馏。在生物柴油生产中使用含水乙醇是优选的,但由于平衡限制和附加工艺步骤造成的经济损失,在常规工艺中不可行。为了解决这个问题,这项研究提出了一种由含水生物乙醇合成生物柴油的节能新方法。成功的关键是一种新颖的装置,该装置将使用固体催化剂的优势与反应和分离的结合相结合。这种集成的过程消除了所有典型的与催化剂相关的操作,并在分离反应器中有效地利用了原料和反应器体积,从而大大节省了资金和运营成本。rn使用计算机辅助过程工程工具执行了嵌入实验结果的严格模拟-例如AspenTech Aspen Plus-设计分离反应器并评估该工艺的总体技术可行性。使用具有RateSep(基于速率)模型的严格RADFRAC单元模拟RD列,并明确考虑了三个阶段的平衡。灵敏度分析用于确定操作参数的最佳范围。给出了使用固体酸作为绿色催化剂,以含水生物乙醇(96%wt)和具有高游离脂肪酸含量(〜100%)的废植物油生产10 ktpy生物柴油(> 99.9wt%)的工厂的主要结果。

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