Synthesis and performance study of multifunctional low-phosphorus copolymer scale inhibitors
The ammonium persulfate was used as an initiator,and maleic anhydride(MA),2-acrylamido-2-methylpropane sulfonic acid(AMPS),and phosphorous acid(HPA)were used as monomers to synthe-size a new low-phosphorus copolymer scale inhibitor MA-AMPS-HPA.Fourier transform infrared spectros-copy(FTIR),scanning electron microscopy(SEM),and X-ray powder diffraction(XRD)were used along with static scale inhibition tests to analyze the influence of the copolymer's structure on CaCO3 generation and scale inhibition performance.The results showed that the optimal preparation conditions for the scale inhibitor were:monomer ratio(nMA∶nAMPS∶nHPA)1∶0.8∶0.4,initiator dosage 10%(w),reaction tempera-ture 90℃,reaction time 10 h.Without scale inhibitor,CaCO3 crystals were mainly rhombohedral calcite,with a small amount of aragonite.After adding MA-AMPS-HPA,CaCO3 crystals were a mixture of calcite,aragonite and vaterite,indicating the low-phosphorus copolymer had a certain inhibitory effect on calcite formation.The highest scale inhibition efficiency of MA-AMPS-HPA up to 94.82%,over 20%higher than PASP and PESA inhibitors,and the performance was close to the phosphorus-containing inhibitors HEDP,PBTCA and ATMPA.
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