Abstract
The synergistic effects of Mg2+, Mn2+, polymer acrylic acid/2-acrylamido-2-methylpropane sulfonic acid/hydroxypropyl acrylate (AA/AMPS/HPA) and aminotrimethylenephosphonic acid (ATMP) on the inhibition of CaCO3 precipitation were studied. The obvious synergy regions were confirmed according to the synergistic parameters. The inhibitory mechanism was discussed according to the light of homogeneous nucleation theory. The crystal of CaCO3 was characterized by means of SEM and XRD. There were good synergistic effects on CaCO3 inhibition in the presence of combination of Mn2+ or Mg2+, AA/AMPS/HPA and ATMP with lower concentration of AA/AMPS/HPA+ATMP (lower than 14 mg/L or 10 mg/L). The synergistic parameters were more than 1. The inhibition effect of ion impurities and organic additives on CaCO3 might result from the increasing of surface free energy and activation energy. The regular shapes of CaCO3 crystals were changed obviously in the presence of impurity ions and organic additives, that was, the crystalline form of CaCO3 transformed from calcite into vaterite.
| Original language | English |
|---|---|
| Pages (from-to) | 132-139 |
| Number of pages | 8 |
| Journal | Shiyou Xuebao, Shiyou Jiagong/Acta Petrolei Sinica (Petroleum Processing Section) |
| Volume | 26 |
| Issue number | 1 |
| State | Published - Feb 2010 |
Keywords
- Calcium carbonate
- Impurity ion
- Phosphonate
- Polyelectrolyte
- Surface free energy
- Synergistic effect