STP1460

    The Effect of Dispersant Solubility, Dispersant Dosage, Granule Diameter, and Dome Versus Radial Extrusion on Granule Spontaneity of Disintegration and Resistance to Attrition

    Published: Jan 2005


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    Abstract

    Dissolution rate of 16 sulfonated dispersants was measured in both water and 32-0-0 liquid fertilizer. Two dispersants, BNA and UCA, having different dissolution rates, were used to granulate a 70 % Amicarbazone formulation. Extrusions were made on a MG-55 Multigranulator using both the dome and radial modes with 0.8 mm and 1.0 mm screens. BNA and UCA were included at levels of 5, 10, and 15% of the formulation. The remaining 14 dispersants were compared at fixed levels of 10 % using only the 0.8 mm screen and dome mode. Premix water requirements varied according to dispersant chemistry. Granule disintegration was measured in hard water by number of inversions, ASTM E l945, and CIPAC MT-174. High level of dispersant, slow dissolution rate of dispersant, and larger diameter granules lead to reduced disintegration rate in water. In addition to these factors, disintegration in 32-0-0 was further affected by porosity of the granule.

    Keywords:

    granule, disintegration, dispersant, lignosulfonate


    Author Information:

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

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

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


    Paper ID: STP11974S

    Committee/Subcommittee: E35.22

    DOI: 10.1520/STP11974S


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