STP1449

    Effect of the Lignin Component Size and Proportioning on the Performance of Heterogeneous Sulfonated Lignin Dispersants

    Published: Jan 2003


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    Abstract

    Kraft lignin (KL) was ultrafiltered (UF) to produce a low molecular weight (Mw) fraction with Mw of 4000 daltons (LMWKL) and a higher Mw fraction with Mw of 40 000 daltons (HMWKL). The UF fractions were combined with a high Mw sulfite lignin (SL) such that LMWKL or HMWKL comprised 15, 30, or 45% of total solids. These combinations were pressure cooked for 2 hours at 150°C and the resulting products tested as dispersants. All combinations showed significant improvement in suspensibility of 85% copper oxychloride (COC) wettable powder (WP) in extra-hard water versus cooked sulfite lignin (CSL). There were no differences associated with type or level of the added UF material. Milling viscosity of a sulfur suspension concentrate (SC) was reduced by all combination products versus CSL. This response was greater for LMWKL cooks (LC) and increased directly with increasing levels of either UF fraction. Suspensibility of sulfur in hard water was significantly improved by all combination products versus CSL; HMWK cooks (HC) were generally more effective.

    Keywords:

    sulfite, kraft, lignin, dispersant, suspensibility


    Author Information:

    Winowiski, T
    Senior Research Associate, General Manager Research and Development, and Research Technician,, LignoTech USA Inc., Rothschild, WI

    Lebo, S
    Senior Research Associate, General Manager Research and Development, and Research Technician,, LignoTech USA Inc., Rothschild, WI

    Stoviak, R
    Senior Research Associate, General Manager Research and Development, and Research Technician,, LignoTech USA Inc., Rothschild, WI

    Gustafsson, J
    Research and Development Lab Manager, Borregaard LignoTech, Sarpsborg,


    Paper ID: STP11197S

    Committee/Subcommittee: E35.22

    DOI: 10.1520/STP11197S


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