Study on the synthesis and scale inhibition mechanism of phosphate type scale inhibitors
This article synthesized two phosphate scale inhibitors,PC-DETPMP and PA-DETPMP,using phosphoric acid(H3PO3)and phosphorus trichloride(PCl3)as raw materials,respectively,and used a commercial phosphate scale inhibitor as a reference.The nuclear magnetic resonance phosphorus spectrum of the synthesized sample indicates that the ratio of PC-DETPMP synthesized from(H3PO3)contains less phosphorus impurities than PA-DEPMP prepared from PCl3,which may be due to the incomplete hydrolysis of PCl3.The scale inhibition efficiency of three phosphate type scale inhibitors on calcium sulfate was evaluated in a highly mineralized formation water,and their scale inhibition performance was compared under different scale inhibitor dosages and pH value conditions.The results indicate that the scale inhibition performance is as follows:PC-DETPMP＞CP-DETPMP＞PA-DETPMP.To further investigate its scale inhibition mechanism,this article uses ion chromatography to measure the concentration of sulfate ions in the solution and calculate the scale inhibition rate,and studies the relationship between its scale inhibition behavior and time.In dynamic experiments,the performance of scale inhibitors tends to stabilize over time,indicating that the phosphate type scale inhibitors in this article mainly rely on the molecular adsorption mechanism of scale inhibitors.
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