Research On Fluorescent Poly (Aspartic Acid) Water Scale Inhibitor

With the rapid economic growth,industrial water consumption has been growing.Industrial water is particularly important in order to ensure the comprehensive utilization of industrial water and sustainable development.Due to the special use of industrial water and its own high hardness,when the industrial water recycling,with the increase in the number of cycles,inevitably produce a lot of scale.Scale production can lead to a variety of industrial production inconvenience:scale will block the water pipes,so that drainage blocked;reduce its heat transfer efficiency,resulting in increased energy consumption.And adding a scale inhibitor is currently a practical solution.At present,most commonly used industrial scale inhibitor will cause some pollution to the environment,while the scale inhibitor in the industrial water in the actual role of the situation can not be detected.And polyaspartic acid scale inhibitors and their derivatives,because of its high scale inhibition performance,good physical and chemical modification and biodegradable properties of concern.In actual use,the addition of scale inhibitor concentration is an important factor in scale inhibition effect,need to achieve a certain concentration requirements in order to play a role in the decomposition of inorganic matter.Scale inhibitor concentration is too high,but will inhibit its scale inhibition efficiency.Industrial applications should be real-time monitoring of the concentration of scale inhibitors.In this study,the decomposition process of the scale inhibitor can be monitored by the fluorescent molecule,and the effect of the scale inhibitor can be monitored.At the same time,the open-loop modification is also carried out in this study,and the modified scale is better.1.preparation of polyaspartic acid.In this paper,polysuccinimide was used to continuously form polyaspartic acid polymer.First use of urea and maleic anhydride as the basic materials,according to the ratio of its molar ratio of 1.5:1 with the addition of the right amount of catalyst?=1:1?,agglomeration,after the combination will produce the corresponding intermediates,Followed by its purification,while the basic implementation of Open loop modification,The modified derivatives have better anti-scale effect.2.Preparation of new scale inhibitor?including naphthalene ring polyaspartic acid?and its effect evaluation.And evaluate the effect of using it.1 in the intermediate as the basic raw materials,and then adding 1-sulfonic acid-2-naphthylamine,you can through a certain chemical reaction,prepared with fluorescent properties of the detergent.And its products to track,evaluate its effect.By fluorescence analysis,the product has a positive correlation with the presence of fluorescence intensity at the excitation wavelength of 346 nm and the emission wavelength is 493 nm,at the addition concentration?5¹5 mg/L?.When the addition amount was 15mg/L,8mg/L and 9mg/L,the inhibition rate of CaCO₃,CaSO₄ and Ca₃?PO₄?were 77.4%,88%and 88%,respectively.3.Preparation of new scale inhibitor?containing benzene ring polyaspartic acid?and its effect evaluation.This experiment is carried out in the case of relatively low basicity,the taurine and L-phenylalanine mixed,and then 1 of the intermediate products open-loop treatment,resulting in a new scale inhibitor-Acid and carboxyl polyaspartic acid,the scale inhibitor has a fluorescent effect.Phe-Try-PASP and Phe-PASP have an excitation wavelength of 320 nm,an emission wavelength of456 nm,an excitation wavelength of 314 nm,and an emission wavelength of 434 nm.Fluorescence tracking was performed to show that the scale inhibitor had a positive correlation with the presence of fluorescence intensity at the addition concentration?2¹0mg/L?.The effect of the addition of Phe-Try-PASP and Phe-PASP was 6mg/L when the temperature was 60?,93.4%and 90.4%,respectively.When Phe-Try-PASP and Phe-PASP were 2.2mg/L and 1.8mg/L respectively,the CaSO4scale was 98.5%and 84.2%,respectively.When Phe-Try-PASP and Phe-PASP concentration reached9mg/L,the inhibition of Ca₃?PO₄?₂ scale reached a peak,reaching about 92%and 88%.4.The morphological changes of CaCO₃ and CaSO₄ were observed by scanning electron microscopy?SEM?.Their growth habit was destroyed by scanning electron microscopy.First,the surface of the regular scale of the crystal decomposition,and then the scale structure of the distortion,then the emergence of loose structure,and ultimately hinder the accumulation of crystals,making it difficult to attach to the surface of the pipe.Explained the reason for the better effect of synthetic scale inhibitor.