Enhancement of cellulose dissolution in water-based solvent via ethanol–hydrochloric acid pretreatment

Jani Trygg, Pedro Fardim

    Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review

    58 Citeringar (Scopus)

    Sammanfattning

    Cellulose dissolution in water-based solvents is essential for processing of regenerated cellulose products such as fibres, films and particles. Cellulose dissolution in NaOH-urea aqueous solution has emerged as a simple and attractive alternative for processing cellulose solutions. However, this solvent requires energy intensive pretreatments such as milling or refining. In this paper we investigate a one step chemical pretreatment method using ethanol-hydrochloric acid prior to the dissolution of cellulose in NaOH-urea-water. The dissolution mechanism of the pretreated sample was initially examined in diluted cupri-ethylenediamine and 7% NaOH-12% urea-water solvent using optical microscopy methods and field emission scanning electron microscopy. The apparent energy of activation for the viscous flow of ethanol-acid pretreated pulp in NaOH-urea-water was calculated using rheological methods. Our results showed that the dissolution of pretreated pulp was achieved up to 4% cellulose concentration. We suggest that the enhancement of dissolution was due to a combination of degradation of remnant primary fibre wall layer and reduction of degree of polymerization of cellulose.
    OriginalspråkOdefinierat/okänt
    Sidor (från-till)987–994
    TidskriftCellulose
    Volym18
    Nummer4
    DOI
    StatusPublicerad - 2011
    MoE-publikationstypA1 Tidskriftsartikel-refererad

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