生物油是通过在不同温度(300-500°C)下对熟食垃圾(CFW)进行缓慢热解而产生的。然后使用 NMR 分析作为定性手段来表征生物油的性质(脂肪族或芳香族),然后使用 GC-MS 确认和量化化合物。该分析表明,低温 (300 °C) 热解主要产生羰基化合物(醛、酮、酯和氧代基团)、左旋葡聚糖和呋喃(分别占 17%、24% 和 38%),被认为是典型的热解化学品。同样,在中温 (400 °C) 下热解会产生大量存在的其他化合物,包括糖类、脂肪族化合物、氮化合物、酸、酚类化合物和醇类。然而,随着热解温度升高到 500 °C,它们的分数会降低,而芳烃的分数会显着增加(>60%)。这种芳烃馏分比来自典型生物质的生物油中的要多得多,这可以归因于 CFW 明显不同的化学特性,因为 CFW 中存在额外的化合物,例如淀粉、蛋白质、蜡和油。此外,芳烃馏分的组成更好,因为在 500 °C 时发现非常高比例的芳醚 (>58%),例如苯,1,3-双 (3-苯氧基苯氧基),可以转化为脂肪族烷烃,脂肪醇、芳香族衍生物和平台化学品通过催化剂添加。这种芳烃馏分比来自典型生物质的生物油中的要多得多,这可以归因于 CFW 明显不同的化学特性,因为 CFW 中存在额外的化合物,例如淀粉、蛋白质、蜡和油。此外,芳烃馏分的组成更好,因为在 500 °C 时发现非常高比例的芳醚 (>58%),例如苯,1,3-双 (3-苯氧基苯氧基),可以转化为脂肪族烷烃,脂肪醇、芳香族衍生物和平台化学品通过催化剂添加。这种芳烃馏分比来自典型生物质的生物油中的要多得多,这可以归因于 CFW 明显不同的化学特性,因为 CFW 中存在额外的化合物,例如淀粉、蛋白质、蜡和油。此外,芳烃馏分的组成更好,因为在 500 °C 时发现非常高比例的芳醚 (>58%),例如苯,1,3-双 (3-苯氧基苯氧基),可以转化为脂肪族烷烃,脂肪醇、芳香族衍生物和平台化学品通过催化剂添加。
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Generation and characterization of bio-oil obtained from the slow pyrolysis of cooked food waste at various temperatures
Bio-oil was generated from slow pyrolysis of cooked food waste (CFW) at various temperatures (300–500 °C). Then NMR analysis was used as a qualitative means to characterize the bio-oil for its nature (aliphatic or aromatic), and then the compounds were confirmed and quantified using the GC–MS. This analysis indicated that the pyrolysis at low temperature (300 °C) mainly generated carbonyl compounds (Aldehydes, Ketones, Esters, and Oxo groups), Levoglucosans, and Furans (17%, 24%, and 38%, respectively) considered as typical pyrolysis chemicals. Similarly, the pyrolysis at medium temperature (400 °C) generated other compounds that were present in significant quantity, including sugars, aliphatic compounds, nitrogen compounds, acids, phenolic compounds, and alcohols. However, their fraction decreased with an increase in pyrolysis temperature to 500 °C and the fraction of aromatics increased significantly (>60%). This aromatics fraction was much more than that in a bio-oil from typical biomass which can be attributed to distinctively different chemical characteristics of CFW due to presence of additional compounds such as starch, proteins, waxes and oils in CFW. Moreover, the composition of aromatic fraction was better because a very high percentage of aromatic ethers (>58%) e.g. Benzene, 1,3-bis (3-phenoxyphenoxy), was found at 500 °C which can be converted into aliphatic alkanes, aliphatic alcohols, aromatic derivatives and platform chemicals by means of catalyst addition.