Fluorescent-tagged block copolymer as an effective and green inhibitor for calcium sulfate scales

摘要

Allyloxy polyethoxy ether (APEG) and succinic anhydride were used to prepare allyloxy polyethoxy carboxylate (APEL). 8-Hydroxy-1,3,6-pyrene trisulfonic acid trisodium salt (PY) was reacted with allyl chloride to produce fluorescent monomer 8-allyloxy-1,3,6-pyrene trisulfonic acid trisodium salt (PA). APEL and PA were copolymerized with maleic anhydride (MA) to synthesize PA tagged no phosphate and nitrogen free CaSO4 inhibitor MA-APEL-PA. Structures of PA, APEG, APEL, and MA-APEL-PA were identified by H-1 NMR. The observation shows that the dosage of MA-APEL-PA plays an important role on CaSO4 inhibition. The effect on formation of CaSO4 was investigated with scanning electron microscope (SEM) analysis. Relationship between MA-APEL-PA's fluorescent intensity and its dosage was studied. Correlation coefficient R (2) of MA-APEL-PA fluorescent intensity and MA-APEL-PA dosage is 0.9991.