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Mechanism of xanthation reaction in viscose process

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Abstract

Xanthation reaction in viscose process is heterogeneous reaction (gaseous CS2-wet alkaline cellulose) complicated with side reactions. Commercial requirement of CS2 in viscose process is 32–34%, which is significantly higher than the stoichiometric requirement (23.5% w/w of the cellulose) due to formation of byproducts. Detailed xanthation reaction kinetics study was performed to understand the xanthate and by-products formation mechanism along with effect of mass transfer and its possible impact on CS2 consumption. Heterogeneous nature of the xanthation reaction offers significant mass transfer resistance and was hypothesized to be driven by CS2 partitioning into wet alkali cellulose and its unstable complex (DTC—dithiocarbonate) formation with alkali. Xanthation reaction mechanism in the form of physico-chemical process steps has been proposed with experimental justification.

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Acknowledgments

Authors acknowledges Grasim Industries Ltd. for financial support to this project along with Analytical Science and Technology Division of ABSTCPL for their instrumental analysis of alkali cellulose, CX and viscose dope samples.

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Authors and Affiliations

  1. Fibre and Textile Division, Aditya Birla Science and Technology Company Pvt. Ltd., Taloja MIDC, Maharashtra, India

    Sachin C. Gondhalekar, Pravin J. Pawar, Sunil S. Dhumal & Shirish S. Thakre

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  1. Sachin C. Gondhalekar
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  2. Pravin J. Pawar
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  3. Sunil S. Dhumal
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  4. Shirish S. Thakre
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Correspondence to Sachin C. Gondhalekar.

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Gondhalekar, S.C., Pawar, P.J., Dhumal, S.S. et al. Mechanism of xanthation reaction in viscose process. Cellulose 26, 1595–1604 (2019). https://doi.org/10.1007/s10570-018-2213-5

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  • DOI: https://doi.org/10.1007/s10570-018-2213-5

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