Synthesis And Scale Inhibition Performance Fatty Alcohol Copolymer

Scale is the most commonly encountered problem in industrial circulating cooling water system. It dosen’t only affect the heat transfer efficiency, thereby causing the loss of heat energy, reducing on yield, also can increase the production cost and extend the production cycle. Scale inhibitor is a kind of chemical reagent which has the ability to prevent inorganic scale or inhibit the growth of the deposition. So the research and development of the effective and reasonable scale inhibitors on calcium scale has a great significance for industrial production. In this paper, a new type of alcohol ether copolymer scale inhibitor was synthesized and purified, the preparation method of copolymer were simple and low cost, less dosage and complete function, and it is better than traditional scale inhibitors with excellent anti-scaling performance, it is a kind of green environmental protection and efficient scale inhibitor which will not cause secondary pollution of water environment due to its ono-sulfur and phosphorus-free.In this paper, alcohol ether carboxylate (AEC) and alcohol ether phosphat e (AEP) were synthesized by gamma-butyrolactone (GBL) method and phospho rus pentoxide (P2O5) acylation method, respectively, with the fatty alcohol poly oxyethylene ether (AE) as raw material. The water-soluble inhibiting-dispersing agent LN-11, LN-12which with carboxylic acid base and phosphate ester base d, respectively, were prepared by aqueous solution copolymerization method, wi th self-made AEC, AEP and acrylic acid (AA) as monomer. The impact of the monomer ratio, initiator dosage, dosage of chain transfer agent, reaction tempe rature and reaction time on the synthesis of copolymer and its scale inhibition performance were studied; The polymer structure, thermal stability performance have been analyzed and characterized by infrared spectrum analysis (FT-IR), n uclear magnetic resonance (NMR), and thermal analysis (TG); The impact on a nti-scaling performance of molecular weight and its distribution of copolymer L N-11have been study by gel permeation chromatography (GPC); Scanning elec tron microscopy (SEM), transmission electron microscopy (TEM) have been use d to characterize the morphology of calcium sulfate scale and type; The proper ties of scale-inhibiting to calcium-phosphate, calcium-sulfate and calcium-carbon ate corrosion inhibiting and dispersing of copolymer LN-11and LN-12to iron oxide in different condition were studied in detail in the laboratory with static method. The affect of circulating water quality changes (such as high tempera ture, high pH, high SO42-, Ca2+) on the performance of scale inhibition were d iscussed; the kinetics of calcium-sulphate crystallization process and the influen ce of temperature on the kinetics were studied; the performance of alcohol eth er copolymer inhibiting-dispersing agent LN-11and LN-12were compared with market scale inhibitor such as Polyacrylic Acid(PAA), Polyamino Polyether M ethylene Phosphonate(PAPEMP),2-Phosphonobutane-1,2,4-Tricarboxylic Acid(PB TC), Acrylic Acid-2-Hydroxypropyl Acrylate(T-225).