Study On Complexation Of Some Inhibitors And Their Calcium Carbonate Inhibiting Mechanisms In Cooling System

In view of excessive exploration of world wide water resource, serious water pollution and extension of industrial apparatus operating period, chemicals with high effect against scale for cooling water treatment is developed rapidly. New-typed, efficient and multiple-functional water treatment chemicals have been the hotpot scientists investigate. But only a few put themselves into mechanisms of scale inhibiting. Accordingly, the goal of this thesis is to seek for mechanisms of inhibition so as to open out new ideas for circulating water inhibition and establish feasible and simple static evaluation methods for inhibition.According to series of laboratory tests, performance of some existing inhibitors is reviewed. The effective multiple-inhibitors fit for the common project is founded. And then this thesis seeks for scale formation and inhibition through other tests. Inhibitors used in these tests are divided into three types according to their functional groups: phosphorate, polymers of carboxylic acid and sulfonated bodies. Such inhibitors: 1-hydroxythylidene-l,ldiphosphonic acid(HEDP), ethylene diamine tetramethylene phosphonic sodium(EDTMPS), amino trimethylene phosphonic acid(ATMP), polyamino polyether methylene phosphonic acid(PAPEMP), hydrolyzed polymaleic anhydride(HPMA), polyeposysuecinic acid(PESA), copolymer of acrylic acid/AMPS(AA/AMPS), are selected in the tests.Such evaluation tests as static method and so on are used to evaluate a single-inhibitor and multiple-inhibitors. The best dispensation formula fit for the cooling water of common project is decided at last. The most efficient inhibitor is PAPEMP, and, multiple-inhibitor of PAPEMP-AA/AMPS are most efficient, and PAPEMP-AA/AMPS 2.5:2.5mg/L is the final formulation. And the other assess techniques are used to evaluate a single-inhibitor, at the same time crystal of scale are observed using a scanning electron microscopy. Conclusion that different inhibitors do on inhibit scale the same way is drown. Somehow the more crystal lattice are distort, the higher performance the inhibitor have. Of course, other factors take effect on inhibition are analyzed.