Chemical Analysis of Impurities in Diverse Bioethanol Samples
Chemical Analysis of Impurities in Diverse Bioethanol Samples
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DOI：
10.1627/jpi.56.414
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发表时间：
2013-11-01
影响因子：
1
通讯作者：
Sakaki, Keiji
中科院分区：
文献类型：
--
作者：
Habe, Hiroshi;Shinbo, Toshio;Sakaki, Keiji
生物乙醇最近已成为化学工业的重要资源。研究了 17 种不同类型的生物乙醇的化学成分，重点关注可能影响下游化学过程催化性能的杂质。与糖或淀粉衍生的生物乙醇相比，木质纤维素乙醇含有更高浓度和更多种类的有机杂质。在木质纤维素乙醇中鉴定出 29 种杂质，而在糖或淀粉衍生的生物乙醇中鉴定出 16 种杂质。木质纤维素乙醇含有高浓度的乙酸、乙醛、甲醇和糠醛等呋喃相关化合物。相比之下，除了通过粗蒸馏获得的糖蜜衍生的生物乙醇外，这些成分在糖或淀粉衍生的生物乙醇样品中的浓度较低。木质纤维素乙醇含有二甲基二硫醚和噻唑，而糖或淀粉衍生的生物乙醇中发现的唯一有机硫化合物是二甲硫醚和二甲亚砜。这些含硫杂质会导致生物乙醇转化过程中的催化剂失活。在木质纤维素乙醇中，检测到超过0.1μg/mL的Si。
Bioethanol has recently become an important resource for chemical industries. The chemical compositions of 17 different types of bioethanol were investigated with a focus on impurities that could affect catalytic performances in the downstream chemical processes. Lignocellulosic ethanol contained higher concentrations and a greater variety of organic impurities compared to sugar- or starch-derived bioethanol. Twenty-nine impurities were identified in lignocellulosic ethanol, whereas 16 impurities were in sugar- or starch-derived bioethanol. Lignocellulosic ethanol contained high concentrations of acetic acid, acetaldehyde, methanol, and furan-related compounds such as furfural. In contrast, with the exception of molasses-derived bioethanol obtained by crude distillation, the concentrations of these components were lower in sugar- or starch-derived bioethanol samples. Lignocellulosic ethanol contained dimethyl disulfide and thiazole, whereas the only organosulfur compounds found in sugar- or starch-derived bioethanol were dimethyl sulfide and dimethyl sulfoxide. These sulfur-containing impurities can cause catalyst deactivation in the bioethanol transformation processes. In lignocellulosic ethanol, more than 0.1 mu g/mL of Si was detected.