Development And Applied Research Of Environmentally Friendly Multifunction Water Treatment Agent

Currently, more and more attention was paid on the multifunctional water treatment agent. At the same time, with the development of industrial economy, Research and development the multifunctional water treatment agent of new type, high efficiency, low cost and environmentally friendly was very important. Therefore, the synthesis of multifunctional water treatment agent was of great significance for descaling corrosion protection in the industrial circulating water. This paper study of this to do the following:1. A novel scale and corrosion inhibitor, IA-MA-AMPS terpolymer was synthesized by itaconic acid(IA), maleic anhydride(MA) and 2-acrylamido-2-methylpropane sulfonic acid(AMPS) using microwave radiation. The terpolymer was characterized by infrared spectroscopy analyses. Its performances were evaluated by static scale inhibition method, electrochemical impedance spectroscopy(EIS), conductivity method, polarization curve method and light transmittance method. Its mechanisms were analyzed through observing scanning electron microscopy(SEM) and X-ray diffraction pattern(XRD) of Ca CO3 and SEM of Q235 A carbon surface. Its scale inhibition mechanism was completely discussed by the method of molecular dynamics(MD) according the micro. Then, the performance of scale inhibition and corrosion inhibition of the terpolymer and the mixture was measured in different wastewater. The results showed that IA-MA-AMPS possessed good corrosion inhibition properties and outstanding scale inhibition performance for Ca CO3. Its scale inhibition efficiency and corrosion inhibition efficiency could reach more than 90% when the additive quantity of 50 mg/L. And It could be used in low and middle hardness, high temperature water treatment system. Its scale inhibition mechanism was related to the lattice distortion effect, chelation and dispersive effect.. Its corrosion inhibition mechanism was a “negative catalytic effect”.EIS which was used for determining scale inhibition performance by electrochemical workstation, was more simple, higher accuracy and far less time consuming than static anti-scaling method and conductivity method.2. Hyperbranched polyesteramide with more functional groups has been prepared by accurate-one-step method. On this basis, HBPAE-AMPS copolymer was structured. First, the as-synthesized HBPAE-AMPS was characterized by Fourier transform infrared spectrometry and measurement of molecular weight. Second, The technology, static scale inhibition method, conductivity, and EIS, showed scale inhibition performances of HBPAE-AMPS was better. And its scale inhibition efficiency could reach up to 91.97%. The polarization curve and EIS showed it had good corrosion inhibition efficiency. And its corrosion inhibition efficiency could reach up to 80.8%. The UV-vis spectroscopy showed that its bactericide rate could reach up to 87.21%. Then, its scale mechanism were mainly common results of lattice distortion and dispersion effect, and corrosion mechanism was mainly through adsorption film on carbon steel surface to achieve the corrosion inhibition. Additionly, its scale and corrosion performance could respectively attained to 83.76% and 75.6% in simulated oilfield wastewater.3. Considering the cost,the hyperbranched polyethylenimine(HPEI) was modified as carboxyl HPEI(CHPEI) using maleic acid(MA). A novel multifunction water treatment reagent, CHPEI-AMPS copolymer, was synthesized by CHPEI and 2-acrylamido-2-methylpropane sulfonic acid(AMPS) using microwave radiation. The CHPEI-AMPS was used as carrier to prepare Ag-loading CHPEI-AMPS composite. The CHPEI-AMPS copolymer and Ag-loading CHPEI-AMPS composite were investigated by Fourier transform infrared spectrometry and XRD. Furthermore, their performances were evaluated by static scale inhibition method, electrochemical impedance spectroscopy(EIS), polarization curve method and UV-visible spectroscopy. Scale inhibition mechanism of CHPEI-AMPS was studied by MD simulation. The results showed that CHPEI-AMPS copolymer and Ag-loading CHPEI-AMPS composite had excellent scale and corrosion performances. When the additive quantity of 50 mg/L, both anti-scaling rate was 99% and the corrosion rate were 91% and 94% respectively. Under the same conditions, Ag-loading CHPEI-AMPS had better bactericidal performance. Moreover, scale inhibition mechanism of CHPEI-AMPS mainly was calcite crystal lattice distortion through the nonbonding interaction and Ca-O bonding effect. Then, the application was investigated in air conditioning cooling water. Their scale inhibition efficiency, corrosion inhibition efficiency and bactericide rate could reach more than 90%. Additionly, Ag-loading CHPEI-AMPS had provided the certain basis for development of the organic-inorganic compound multifunctional water treatment agent using organic as the carrier.