Parastillation and metastillation applied to bioethanol and neutral alcohol purification with energy savings
Parastillation and metastillation applied to bioethanol and neutral alcohol purification with energy savings
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DOI：
10.1016/j.cep.2021.108334
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发表时间：
2021-02-22
影响因子：
4.3
通讯作者：
Meirelles, Antonio J. A.
中科院分区：
文献类型：
--
作者：
Biasi, Lilian C. K.;Batista, Fabio R. M.;Meirelles, Antonio J. A.
生物乙醇是一种重要的生物燃料，具有很大的潜力成为一种安全环保的化石燃料替代品。然而，生物乙醇生产涉及许多蒸馏步骤，这是最耗能的分离过程之一。提出了非常规蒸馏技术，旨在降低生物乙醇生产的能源成本和CO2排放。探讨了准蒸馏和准蒸馏工艺以及这些技术的新奇组合。在所有提出的配置中，液相或气相在塔内分开。首次研究了多冷凝器并联精馏塔和不同精馏工艺的串联精馏塔。多个冷凝器的设置，避免了汽相的不必要的混合。组合塔由精馏段的准蒸馏塔板和汽提段的准蒸馏塔板或常规塔板组成。与传统蒸馏相比，新配置可将年总成本和二氧化碳排放量分别降低35%和42%。与以前的结果不同，在不增加塔高的情况下，通过使用转移蒸馏而不是常规蒸馏来减小塔直径是可能的。因此，生物燃料和中性酒精的生产可以更加经济和可持续。
Bioethanol is an important biofuel with high potential to be a safety environmental alternative to fossil fuels. However, bioethanol production involves many distillation steps, which is one of the most energy consuming separation processes. Unconventional distillation techniques were proposed, aiming to reduce energy cost and CO2 emissions on bioethanol production. Parastillation and metastillation processes and novelty combinations of these techniques were explored. In all proposed configurations the liquid or vapor phase was divided inside the column. For the first time, parastillation columns with multiple condensers and columns with different distillation techniques combined into one unique column shell, here denominated as combined columns, were studied. Multiple condensers set, in parastillation columns, avoids the non-necessary mixed of the vapor phases. Combined columns are composed of parastillation trays in the rectifying section and of metastillation or conventional trays in the stripping section. The new configurations reduce total annual costs and CO2 emissions up to 35 % and 42 %, respectively, when compared with traditional distillation. Reduction in the column diameter by using metastillation instead of conventional distillation was possible without an increase in the column height, differently from previously results. Therefore, biofuel and neutral alcohol production can be even more economical and sustainable.