Preparation of fluorescent polyaspartic acid and evaluation of its scale inhibition for CaCO₃ and CaSO₄

Abstract

Polysuccinimide was synthesized from maleic anhydride and urea. A polyaspartic acid derivative (PASP‐Try‐SEA) was synthesized from the polysuccinimide with 2‐aminoethanesulfonic acid and tryptophan. The products were characterized by UV, FTIR,1H NMR, TGA and PL, respectively. The results showed that the fluorescent chromophore‐indolyl groups were successfully incorporated into PASP. The relationship between the fluorescence intensity and the concentration of fluorescent polyaspartic acid (FPASP) is linear with the excitation wavelength of 366 nm and 422 nm. FPASP also showed excellent scale inhibition properties with a scale inhibition rate of 78% achieved for CaCO3 with a dosage of 9 mg/L and a significantly enhanced scale inhibition effect for CaSO4, achieving an inhibition rate of 98%, which were determined using the static scale inhibition method. When FPASP was added to the solution, CaCO3 and CaSO4 deposits showed flower patterns with floppy accumulation by scanning electron microscopy. Copyright © 2016 John Wiley & Sons, Ltd.

Synthesis and applications of fluorescent-tagged scale inhibitors in water treatment. A review

“…In 1992 the Nalco Chemical Company first patented an implementation of a fluorescent fragment into the polymeric scale inhibitor [3], Figure 1a. This communication was soon followed by numerous patents issued by Nalko [4][5][6][7], Rhodia Chimie [8,9], Kemira Chemicals Inc. [10][11][12], Ecolab USA Inc. [13,14], PJSC "Fine Chemicals R&D Centre" [15] and by several universities and research centers of Republic of China [16][17][18][19][20], as well as by research reports [2,[21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36]. In 2019 the first communication on synthesis and applications of a fluorescent-tagged phosphonate scale inhibitor -1-hydroxy-7-(6-methoxy-1,3-dioxo-1H-benzo[de]isoquinolin-2(3H)-yl)heptane-1,1-diyl-di(phosphonic acid), (HEDP-F) was published [37], Figure 1b.…”

Synthesis of a polyaspartic acid/4‐(2‐aminoethyl) morpholine graft copolymer and evaluation of its scale and corrosion inhibition performance

“…As a thermal fluid, water containing large varieties of salts and minerals flow through cooling pipes and repeatedly remove the heat generated in production process. During recirculation operation, since some of the water evaporates and the temperature increases, the substances present in the thermal fluid can accumulate and become concentrated, and the pH can change . As a result, the formation of scale, which blocks heat transfer and reduces the flow rate, can occur.…”

“…During recirculation operation, since some of the water evaporates and the temperature increases, the substances present in the thermal fluid can accumulate and become concentrated, and the pH can change. 2 As a result, the formation of scale, which blocks heat transfer and reduces the flow rate, can occur. Scaling results in high industrial costs and potential safety issues.…”

Performance of a novel fluorescent-tagged polyacrylate at a cooling tower test facility: a bench-scale and industrial-scale evaluation

“…Therefore, adequate monitoring of the polymer concentration is needed to minimize the consumption of both a scale inhibitor and water. Along with conventional monitoring methods based on UV-VIS or potentiometry [6], the intensity of fluorescence emitted from a tracer covalently bound to a polymer, becomes a matter of choice [7][8][9][10][11]. Meanwhile, most of these reports are based on the beaker-level experiments [12].…”