SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2023, Vol. 53 ›› Issue (1): 300-309.DOI: 10.1016/j.cjche.2021.12.028

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Study on the catalytic degradation of sodium lignosulfonate to aromatic aldehydes over nano-CuO: Process optimization and reaction kinetics

Yingjie Song1,2, Shuqi Zhong1,2, Yingjiao Li1,2, Kun Dong1,2, Yong Luo2, Guangwen Chu1,2, Haikui Zou1,2, Baochang Sun1,2   

  1. 1. State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China;
    2. Research Center of the Ministry of Education for High Gravity Engineering and Technology, Beijing University of Chemical Technology, Beijing 100029, China
  • Received:2021-06-19 Revised:2021-12-10 Online:2023-04-08 Published:2023-01-28
  • Contact: Guangwen Chu,E-mail:chugw@mail.buct.edu.cn;Baochang Sun,E-mail:sunbc@mail.buct.edu.cn
  • Supported by:
    This work was supported by the National Key Research and Development Program of China (2019YFA0210302), and the National Natural Science Foundation of China (21878009).

Study on the catalytic degradation of sodium lignosulfonate to aromatic aldehydes over nano-CuO: Process optimization and reaction kinetics

Yingjie Song1,2, Shuqi Zhong1,2, Yingjiao Li1,2, Kun Dong1,2, Yong Luo2, Guangwen Chu1,2, Haikui Zou1,2, Baochang Sun1,2   

  1. 1. State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China;
    2. Research Center of the Ministry of Education for High Gravity Engineering and Technology, Beijing University of Chemical Technology, Beijing 100029, China
  • 通讯作者: Guangwen Chu,E-mail:chugw@mail.buct.edu.cn;Baochang Sun,E-mail:sunbc@mail.buct.edu.cn
  • 基金资助:
    This work was supported by the National Key Research and Development Program of China (2019YFA0210302), and the National Natural Science Foundation of China (21878009).

Abstract: As one of the few renewable aromatic resources, the research of depolymerization of lignin into high-value chemicals has attracted extensive attention in recent years. Catalytic wet aerobic oxidation (CWAO) is an effective technology to convert lignin like sodium lignosulfonate (SL), a lignin derivative, into aromatic aldehydes such as vanillin and syringaldehyde. However, how to improve the yield of aromatic aldehyde and conversion efficiency is still a challenge, and many operating conditions that significantly affect the yield of these aromatic compounds have rarely been investigated systematically. In this work, we adopted the stirred tank reactor (STR) for the CWAO process with nano-CuO as catalyst to achieve the conversion of SL into vanillin and syringaldehyde. The effect of operating conditions including reaction time, oxygen partial pressure, reaction temperature, SL concentration, rotational speed, catalyst amount, and NaOH concentration on the yield of single phenolic compound was systematically investigated. The results revealed that all these operating conditions exhibit a significant effect on the aromatic aldehyde yield. Therefore, they should be regulated in an optimal value to obtain high yield of these aldehydes. More importantly, the reaction kinetics of the lignin oxidation was explored. This work could provide basic data for the optimization and design of industrial operation of lignin oxidation.

Key words: Nano-CuO, Sodium lignosulfonate, Catalytic wet aerobic oxidation (CWAO), Aromatic aldehyde, Reaction kinetics

摘要: As one of the few renewable aromatic resources, the research of depolymerization of lignin into high-value chemicals has attracted extensive attention in recent years. Catalytic wet aerobic oxidation (CWAO) is an effective technology to convert lignin like sodium lignosulfonate (SL), a lignin derivative, into aromatic aldehydes such as vanillin and syringaldehyde. However, how to improve the yield of aromatic aldehyde and conversion efficiency is still a challenge, and many operating conditions that significantly affect the yield of these aromatic compounds have rarely been investigated systematically. In this work, we adopted the stirred tank reactor (STR) for the CWAO process with nano-CuO as catalyst to achieve the conversion of SL into vanillin and syringaldehyde. The effect of operating conditions including reaction time, oxygen partial pressure, reaction temperature, SL concentration, rotational speed, catalyst amount, and NaOH concentration on the yield of single phenolic compound was systematically investigated. The results revealed that all these operating conditions exhibit a significant effect on the aromatic aldehyde yield. Therefore, they should be regulated in an optimal value to obtain high yield of these aldehydes. More importantly, the reaction kinetics of the lignin oxidation was explored. This work could provide basic data for the optimization and design of industrial operation of lignin oxidation.

关键词: Nano-CuO, Sodium lignosulfonate, Catalytic wet aerobic oxidation (CWAO), Aromatic aldehyde, Reaction kinetics