Modified Lyocell process to improve dissolution of cellulosic pulp and pulp blends in NMMO solvent
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ORIGINAL RESEARCH
Modified Lyocell process to improve dissolution of cellulosic pulp and pulp blends in NMMO solvent Sachin Jadhav . Ashwini Lidhure . Shirish Thakre . Vivek Ganvir
Received: 13 June 2020 / Accepted: 11 November 2020 Ó Springer Nature B.V. 2020
Abstract Utilization of low-cost paper grade pulp is not feasible in Lyocell process due to presence of metallic and hemicellulose impurities that degrade cellulose and N-methyl-morpholine-N-oxide and lower the onset temperature of dope to initiate runway reaction. Conventional Lyocell process is restricted to use good quality dissolving grade pulp for safety reasons. To overcome this limitation, modified Lyocell process is demonstrated by pretreating pulps to remove metallic and hemicellulose impurities. Effectiveness of modified Lyocell process for faster dissolution and impurities removal for pulps/pulp
blends is studied. Pretreatment of pulp blends significantly reduce impurities by 14–32% and improve swelling of pulp results in faster dissolution and safer process. Biopolymer prepared from modified process reduces undissolved particles by 50% and impurities by 30% thus improving overall quality and spinnability. This concept provides practical solution for using paper grade/impure pulps and making it more economical, faster dissolution and safe as compared to conventional process.
S. Jadhav A. Lidhure S. Thakre V. Ganvir (&) Aditya Birla Science and Technology Company Pvt. Ltd (ABSTCPL) MIDC Taloja, Navi Mumbai 410208, India e-mail: [email protected] S. Jadhav e-mail: [email protected] A. Lidhure e-mail: [email protected] S. Thakre e-mail: [email protected]
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Cellulose
Graphical abstract
Keywords Lyocell NMMO Dissolution Biopolymer Cellulose pulp Metal impurities removal
Introduction Cellulose is one of the most abundant natural biopolymers on earth with many applications. However, unlike synthetic polymers cellulose cannot be melted as its melting temperature is higher than its degradation temperature. Hence the alternative to melt cellulose is to dissolve in good solvents (Yamane et al. 2006; Medronho and Lindman 2015) but due to its insolubility in many organic solvents, restricts utilization of cellulose, especially in functional biomaterials and new fields (Lindman et al. 2010). For the preparation of fibers, films and composites direct dissolution of cellulose in polar solvent is preferred as green processes (Kim et al. 2005). Direct dissolution of cellulose in polar solvents is challenging and involves many complex mechanisms to dissolve cellulose in higher concentrations to make polymer dope for commercially viable process. To dissolve
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cellulose, right chemistry of polar solvents, swelling of cellulose in solvents, breaking of hydrogen bonding and partial degradation of cellulose chains are required. Hence, cellulose dissolution is important area of interest in polymer science (Peng et al. 2017). Many solvents have been
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