Bioethanol dehydration and mixing by heterogeneous azeotropic distillation
Bioethanol dehydration and mixing by heterogeneous azeotropic distillation
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DOI：
10.1016/j.jclepro.2021.128810
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发表时间：
2021-08
影响因子：
11.1
通讯作者：
Alexandra Elena Plesu Popescu;José Lluis Pellin;J. Bonet;J. Llorens
中科院分区：
文献类型：
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作者：
Alexandra Elena Plesu Popescu;José Lluis Pellin;J. Bonet;J. Llorens
根据许多国家通过减少使用化石燃料追求环境可持续性的立法，生物乙醇与汽油混合。生物乙醇是通过许多有机废物或生物质资源在稀释的水性介质中发酵而产生的。不幸的是，用于燃料用途的生物乙醇必须具有低含量的水，并且其回收是能量密集型操作。非均相共沸蒸馏（HAD）是用于醇（例如乙醇）脱水的公知的合适选择。在文献中研究了许多用于该过程的催化剂，并且在本研究中，检查并验证了汽油和汽油添加剂呈现最低的能量消耗。为此，提出了新工艺，并使用AspenPlus®进行了严格模拟，以验证其相对于目前使用的传统工艺的性能。根据模拟结果，工艺，然后比较的环境影响（表示的潜在环境影响（PEI）指数）和经济成本。乙醇脱水是一个非自发的过程，需要能量来完成，另一方面，乙醇与汽油和添加剂的混合是一个自发的过程。将这两种工艺结合在一个单元中，能源消耗减少50%，潜在环境影响减少80%。最后，经济研究表明，采用一个精馏塔的新方案的好处，资本支出减少了20%，投资回收期为1.5年。因此，提出了一种新的可行的工艺，大大降低了当今汽油生产对环境的影响。
Bioethanol is mixed with gasoline according to many countries' legislation pursuing environmental sustainability by reducing the use of fossil fuels. Bioethanol is produced by fermentation of many organic waste or biomass resources in diluted aqueous media. Unfortunately, bioethanol for fuel use must have a low content of water and its recovery is an energy intensive operation. Heterogeneous azeotropic distillation (HAD) is a well-known suitable option for dehydration of alcohols, e.g. ethanol. Many entrainers for this process are studied in literature and, in this study, is checked and verified that gasoline and gasoline additives present the lowest energy consumption. For this purpose, novel processes are proposed and rigorously simulated using AspenPlus® to verify their performance with respect to conventional processes used currently. Based on the simulation results, the processes are then compared in terms of environmental impact (expressed by the Potential Environmental Impact (PEI) index) and economic cost. Ethanol dehydration is a non-spontaneous process that requires energy to be accomplished and, on the other hand, mixing ethanol with gasoline and additives is a spontaneous process. Combining both processes in synergy in a single unit, energy consumption decreases by 50% and Potential Environmental Impact by 80%. Finally, the economic study indicated the benefits of employing the novel proposed scheme of one distillation column as CAPEX is reduced by 20% and the payback time to 1.5 years. Therefore, a novel viable process is proposed that greatly reduces the environmental impact of nowadays gasoline production.