Synthesis And Properties Of Fluorescent Tracer Water Treatment Agent

In order to solve the problems of corrosion,scaling,and microbial growth in cycling circulating water,various water treatment agents,such as corrosion inhibitors,scale inhibitors,and bactericides are used.To ensure the effect of treatment,the concentration of water treatment agent should be monitored in real time.The traditional detection method indirectly obtains the concentration of the water treatment agents by measuring the total phosphorus content,the operation is complicated and requires a lot of manpower and time.Fluorescent tracer technology is applied to the circulating cooling water system,to determine the concentration of water treatment agent quickly and accurately in industrial production.This type of technique determines the concentration of water treatment agent by the linear relationship between the fluorescence intensity of water and the concentration of the fluorescent substance.Online monitoring and automatic control of agent concentration can be realized by fluorescent tracer technology together with online fluorescence detector.The key to the application of fluorescent tracer technology is to synthesize water treatment agents with fluorescent properties.The object of this paper is to study the application of water-soluble fluorescent monomer and fluorescent polymer in circulating cooling water.The main experimental contents and results are as follows:(1)A kind of fluorescent monomer 8-allyloxy-1,3,6-pyrene was synthesized using pyranine and allyl chloride,and the structure of the product was characterized by NMR.The synthesis method was optimized by single factor test and orthogonal test,and the optimum conditions are as follows:reaction temperature was 80?,reaction time was 6 h,the molar ratio of sodium hydroxide to solvent green 7 is 2.0:1,and the molar ratio of allyl chloride to solvent green 7 is 6.0:1.(2)The fluorescence properties of the two fluorescent monomers were studied.The results show that the linear relationship between the fluorescence intensity and the concentration of the two fluorescent monomers is good.At 289nm as excitation wavelength,the fluorescence spectrums would not affect each other.The interference factors in water include temperature,pH,inorganic salt ions have no significant effect on the fluorescent monomers,but the biocides will reduce the fluorescence intensity of the fluorescent monomers to some extent.The two fluorescent monomers can be used to prepare fluorescent water treatment agents for the excellent fluorescence properties and strong stability.(3)The toxicity was tested using zebra fish as test material,the results of 96 h toxicity test show that there is no significant impact on the life activities of zebrafish when the concentrations of the two fluorescent monomers are not more than 1 mg/L.(4)The fluorescent copolymer FM-PAA was copolymerized with ABTS fluorescent monomer and acrylic acid(AA).The fluorescence intensities have good linearity with the concentration of FM-PAA;FM-PAA shows good inhibition performance on calcium carbonate comparable to that of commonly used inhibitor PAA,for which it can be used as a scale inhibitor in circulating water.(5)The fluorescent copolymer FM-3100 was copolymerized using acrylic acid(AA)?2-Acrylamido-2-Methylpropane sulfonic acid(AMPS)?N-Tert-Butyl acrylamide(TBAM)and ABTS fluorescent monomer.The fluorescence intensities have good linearity with the concentration of FM-3100;FM-3100 has good dispersion properties of iron oxide and zinc,and the dispersion performances are comparable to that of commonly used dispersants ACUMER 3100.So it can be used as a dispersant in circulating water.