Diols production from pyrolysis oil water-soluble fraction

IF 2.8 4区生物学 Q3 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Journal of chemical technology and biotechnology Pub Date : 2024-07-15 DOI:10.1002/jctb.7711

Dan Luo, Shuqian Xia, Lixiao Guo, Yang Liu, Yuhang Zhang, Zhiting Gao, Yahua Gao

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引用次数: 0

Abstract

BACKGROUND

The production of value-added chemicals from pyrolysis oil or its fractions is of great significance for the valorization of biomass. Diols, including ethylene glycol (EG) and 1,2-propylene glycol (1,2-PG), are important bulk chemicals with widespread industrial applications. Here we investigated the production of diols from pyrolysis oil water-soluble fraction (WS) using a hybrid catalyst (Ni + H₂WO₄).

RESULTS

Firstly, levoglucosan, glycolaldehyde and acetol, three main components in WS, were respectively selected as the single model compound, and their respective conversions into diols were investigated at different temperatures for different reaction times. The result showed the optimum reaction temperature and time were 180 °C and 2 h respectively, under which a EG yield of 53.8% and 1,2-PG yield of 5.2% were obtained from levoglucosan conversion, a EG yield of 98.6% was obtained from glycolaldehyde conversion, and a 1,2-PG yield of 98.5% was obtained from acetol conversion. The reaction pathway of levoglucosan conversion was analyzed. Secondly, the model mixture of levoglucosan, glycolaldehyde and acetol was used to simulate the real WS, and their conversion was investigated at different ratios of H₂WO₄ to Ni. The result showed the optimum catalyst composition was 0.15 g H₂WO₄ and 0.3 g Ni, under which a EG yield of 76.4% and 1,2-PG yield of 38.4% were obtained. Thirdly, the real original WS was converted under the optimum reaction conditions and the result only gave a EG yield of 19.1% and 1,2-PG yield of 25.8% (based on the carbon moles of main substrates), which were much less than the two yields of model mixture. That was related to the presences of other types of chemicals in original WS. After the original WS being adsorbed by activated carbon, the yields of EG and 1,2-PG could be increased to 39.2% and 37.9%, respectively.

CONCLUSION

The presences of certain other types of chemicals (such as acids, furans, phenolics and cyclopentanones) in original WS inhibited the production of diols. The activated carbon adsorption could efficiently remove most of furans, phenolics and cyclopentanones in original WS and increased significantly the diols yields. © 2024 Society of Chemical Industry (SCI).

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利用热解油水溶性馏分生产二元醇

利用热解油或其馏分生产高附加值化学品对生物质的增值具有重要意义。二元醇（包括乙二醇（EG）和 1,2-丙二醇（1,2-PG））是重要的大宗化学品，具有广泛的工业用途。在此，我们研究了使用混合催化剂（Ni + H2WO4）从热解油水溶性馏分（WS）中生产二元醇的方法。首先，我们分别选择了 WS 中的三种主要成分左旋葡聚糖、乙醛和乙醇作为单一模型化合物，并研究了它们在不同温度、不同反应时间下分别转化为二元醇的情况。结果表明，最佳反应温度和时间分别为 180 ℃ 和 2 h，在此温度下，左旋葡聚糖转化的 EG 收率为 53.8%，1,2-PG 收率为 5.2%；乙醛转化的 EG 收率为 98.6%；乙醇转化的 1,2-PG 收率为 98.5%。分析了左旋葡聚糖转化的反应途径。其次，用左旋葡聚糖、乙醛和乙醇的模型混合物模拟真实的 WS，并研究了 H2WO4 与 Ni 的不同配比下它们的转化率。结果表明，最佳催化剂组成为 0.15 克 H2WO4 和 0.3 克 Ni，在此条件下，EG 收率为 76.4%，1,2-PG 收率为 38.4%。第三，在最佳反应条件下转化真正的原始 WS，结果仅得到 19.1%的 EG 收率和 25.8%的 1,2-PG收率（基于主要底物的碳摩尔数），远低于模型混合物的两个收率。这与原始 WS 中含有其他类型的化学物质有关。原始 WS 被活性炭吸附后，EG 和 1,2-PG 的产率可分别提高到 39.2% 和 37.9%。活性炭吸附能有效去除原 WS 中的大部分呋喃、酚类和环戊酮，并显著提高二元醇的产率。© 2024 化学工业学会（SCI）。

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来源期刊

Journal of chemical technology and biotechnology 工程技术-工程：化工

CiteScore

7.00

自引率

5.90%

发文量

268

审稿时长

1.7 months

期刊介绍： Journal of Chemical Technology and Biotechnology(JCTB) is an international, inter-disciplinary peer-reviewed journal concerned with the application of scientific discoveries and advancements in chemical and biological technology that aim towards economically and environmentally sustainable industrial processes.