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Understanding the effect of low-concentrated protic ionic liquids (PILs) on coconut (Cocos nucifera) residues

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Abstract

Concentrated protic ionic liquid (PIL) without dilution has increased saccharification efficiency due to the solubilization of hemicellulose and lignin compounds. However, concentrated PILs are not cost-effective, highly viscous, and toxic to microorganisms. The present study evaluates the effect of PILs on the solubilization of hemicellulose and lignin present in coconut coir and pith. PILs including pyridinium hydrogen sulfate [PyH][HSO4] and triethylammonium hydrogen sulfate [TEA][HSO4] were considered in this study. The sugars and lignin were partially hydrolyzed during the PIL pretreatment of coir and pith. However, the degree of biomass solubilization varied for different types of biomass and PIL. The changes in the biomass after pretreatment were studied through FTIR and XRD analysis. The yield of glucose released from [PyH][HSO4] and [TEA][HSO4] pretreated coir and pith increased 4.12, 4.73 and 7.36, and 6.44, respectively. The results showed that diluted PIL could be used in a biorefinery to increase the glucose yield with almost similar efficiency obtained from concentrated PIL. The recovery and reusability studies showed the recycled PIL could be utilized 3 times. Further application of low concentrations of PIL suggests the possibility of a new process design for a biorefinery to achieve low operating costs.

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Funding

The Ministry of Human Resource Development (India) and the Department of Science and Technology (India) funded and supported this work under FAST and FIST programs, respectively. Malinee Sriariyanun was supported by King Mongkut’s University of Technology North Bangkok (Contract No. KMUTNB-FF-65–37).

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Authors and Affiliations

  1. Chemical and Process Engineering (CPE), The Sirindhorn International Thai-German Graduate School of Engineering, King Mongkut’s University of Technology North Bangkok (KMUTNB), Bangkok, 10800, Thailand

    Marttin Paulraj Gundupalli & Malinee Sriariyanun

  2. Biorefinery and Process Automation Engineering Center (BPAEC), King Mongkut’s University of Technology North Bangkok (KMUTNB), Bangkok, Thailand

    Marttin Paulraj Gundupalli & Malinee Sriariyanun

  3. Department of Chemistry, Indian Institute of Technology Hyderabad, Telangana, India

    Kulsum Bano & Tarun Kanti Panda

  4. Department of Civil Engineering, Indian Institute of Technology Hyderabad, Telangana, India

    Debraj Bhattacharyya

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  1. Marttin Paulraj Gundupalli
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Gundupalli, M.P., Bano, K., Panda, T.K. et al. Understanding the effect of low-concentrated protic ionic liquids (PILs) on coconut (Cocos nucifera) residues. Biomass Conv. Bioref. 14, 3275–3291 (2024). https://doi.org/10.1007/s13399-022-02572-4

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