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Fate of CS2 in viscose process: a chemistry perspective

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Abstract

Cellulose dissolution in the viscose process has been facilitated through derivatization by carbon disulphide (CS2) at xanthation stage by converting alkali cellulose (AC) to cellulose xanthate (CX). CX formation has been always accompanied with sulphur based byproducts formation as dictated by the mechanism published in earlier study (Gondhalekar et al. (Cellulose 26 3 1595–1604, 2019)). The sulphur byproducts formed during viscose synthesis are sodium sulphide (Na2S), sodium trithiocarbonate (Na2CS3: TTC) and other minor sulphur compounds. These byproducts continue to form during ripening process as dictated by time and temperature coupled with concentration of free caustic and CS2 present in the system. These byproducts get converted into sodium sulphate (Na2SO4), hydrogen sulphide (H2S), CS2 and other sulphurous compounds during spinning. Overall, uncontrolled ripening without parametric optimization adversely impacts raw material (RM) consumption and creates sustainability challenges. Overall optimization based on viscose process fundamental insights presented in this study will effectively help in achieving operational excellence by reducing rate of undesired reactions to improve RM specific consumption and will compliment overall sustainability efforts in viscose industry.

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Acknowledgments

Authors SCG, SSD, PP and ST acknowledges Grasim Industries Ltd. for financial support for this project. Authors also acknowledges Analytical Science and Technology Division of ABSTCPL.

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Authors and Affiliations

  1. Fibre and Textile Division, Aditya Birla Science and Technology Company Private Limited, Navi Mumbai, Maharashtra, India

    Sachin C. Gondhalekar, Pravin J. Pawar, Sunil S. Dhumal & Shirish 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 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. Fate of CS2 in viscose process: a chemistry perspective. Cellulose 29, 1451–1461 (2022). https://doi.org/10.1007/s10570-021-04398-1

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