The Effects of Phosphonate-Based Scale Inhibitor on Brine
  • venynxvenynx October 2018
    To explore the effects of scale inhibitors on subsurface water–mineral
    interactions, here batch experiments on biotite dissolution (0–96 h)
    were conducted in solutions containing 0–1.0 mM
    diethylenetriaminepenta(methylene)phosphonate (DTPMP, silicone additives
    a model scale inhibitor), at conditions simulating subsurface
    environments (95 °C and 102 atm CO2). The phosphonate groups in DTPMP
    enhanced biotite dissolution through both aqueous and surface
    complexations with Fe, with more significant effects at a higher DTPMP
    concentration. Surface complexation made cracked biotite layers bend,
    and these layers detached at a later stage (≥44 h). The presence of
    DTPMP also promoted secondary precipitation of Fe- and Al-bearing
    minerals both in the solution and on the reacted biotite surfaces. With
    1.0 mM DTPMP after 44 h, significant coverage of biotite surfaces by
    precipitates and less detachment of cracked layers blocked reactive
    sites and inhibited further biotite dissolution. Furthermore, adsorption
    of DTPMP made the reacted biotite basal surfaces more hydrophilic,
    which may affect the transport of reactive fluids. This study provides
    new information on the impacts of phosphonates in brine–mineral
    interactions, benefiting safer and more environmentally sustainable
    design and operation of engineered subsurface processes.

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