Studies On Synthesis And Performances Of Germicide With Corrosion Inhibition

Along with the fast growth of the economy of our country, the shortage of water resources has become one of the important factors that restrict the development of economy. About one fifth of the total consumption amount of water in our country is industrial water and its rate of re-utilization is far lower than that of developed countries. The circulating cooling water is the biggest consumer of industrial water. Therefore, it is very important for the research and development of new water treatment agents and processes to improve the rate of re-utilization of industrial circulating cooling water and to resolve the contradiction between the shortage and waste of water resources.Hexadecylldimethyl (2–sulphite)ethyl ammonium(C₂₀) was synthesized and its biodegradability and ability of sterilization were analyzed by oxygen consumption, suspension quantitative and minimal inhibitory concentration methods respectively in this paper. The compatibilities of C₂₀ with the different scale inhibitor, corrosion inhibitor and germicide were investigated with static scale inhibition and rotary hanging piece methods. The scale inhibition mechanisms of C₂₀ and its compounding agents were also preliminarily studied using Scanning Electron Microscope(SEM).The main contents of this thesis are as follows:1. The C₂₀ was synthesized by the reaction of ethylene sulfite and hexadecylldimethyl ammonium. The synthetic process was improved with the absorption of HCl and H2O remained in the synthetic intermediator using the soda lime and the by-product during the synthesis of C₂₀ was decreased. The effects of reaction time and temperature on the yield of C₂₀ were studied.2. The abilities of biodegradation, sterilization and corrosion inhibition of C₂₀ were investigated. The results show that C₂₀ has good biodegradability and the rate of biodegradation is 85% in 28 days. Good sterilizing effect of C₂₀ was found to the normal microbion including soil bacteria, sulphate-reducing bacteria, iron bacteria and heterotrophic bacteria in the circulating cooling water system. The rate of corrosion inhibition is 54.38% when the concentration of C₂₀ is 40 mg·L-1 and it shows good ability of corrosion inhibition.3. The ability of compatibility of C₂₀ was investigated. The result shows that C₂₀ mixing with copolymer of maleic and acrylic acid , 1-hydroxy ethylidene-1,1-diphosphonic acid and industrial product SWT-303 respectively, has good scale inhibition and corrosion inhibition abilities. The scale inhibition mechanism of C₂₀ was preliminarily discussed using SEM.4. The excellent sterilizing ability of germicide CGL mixed by C₂₀ and glutaraldehyde was observed and CGL is an environment-friendly germicide for its good biodegradability. The good scale and corrosion inhibition behaviors of CCD obtained by mixing of C₂₀, glutaraldehyde and diethylene triamine penta (methylene phosphonic acid) were found. According to the results of SEM, maybe the reduction of crystallite is the main reason for the good dispersion behavior of CCD to the scale of calcium carbonate.