二元MA-AMPS共聚物與有機膦酸PBTCA復(fù)配的新型阻垢劑制備及性能研究
發(fā)布時間：2018-08-31 18:17
【摘要】：為推進綠色化學(xué)清潔生產(chǎn)技術(shù),實現(xiàn)可持續(xù)發(fā)展戰(zhàn)略,研究開發(fā)用于防止工業(yè)循環(huán)冷卻水系統(tǒng)中水質(zhì)變質(zhì)、結(jié)垢、腐蝕等問題的新型水處理阻垢劑是目前環(huán)保領(lǐng)域廣泛關(guān)注的難點課題。本文開發(fā)了一種新型的復(fù)配型阻垢劑,可用于高溫、高堿度、高pH值和高硬度循環(huán)冷卻水系統(tǒng)。經(jīng)過試驗確定了阻垢劑的制備方法:以水為溶劑,氧化還原體系為引發(fā)劑,馬來酸酐(MA)和2-丙烯酰胺-2-甲基丙基磺酸(AMPS)為聚合單體,2-膦酸丁烷-1,2,4-三羧酸(PBTCA)為復(fù)配劑,采用聚合與復(fù)配同步進行的方式,制得了復(fù)配型阻垢劑MA-AMPS/PBTCA。選擇靜態(tài)沉積實驗方法評價阻垢劑的性能,通過對制備工藝條件進行單因素實驗,得出各因素的較優(yōu)范圍:原料MA、AMPS和PBTC A用量為60%、40%和20%,反應(yīng)溫度70℃~75℃,引發(fā)劑用量12%~14%。參考單因素實驗結(jié)果,選取四個主要因素和三個參數(shù)水平進行正交實驗,分別以阻碳酸鈣、磷酸鈣垢率為指標得到最佳反應(yīng)條件為:m(MA:AMPS:PBTCA)=5:2:3、5:2:2,氧化劑選擇過硫酸鈉、過硫酸銨,引發(fā)劑用量均選12%,反應(yīng)溫度80℃、70℃,阻碳酸鈣、磷酸鈣垢率達79%、95%以上。對應(yīng)用條件的考察結(jié)果,當Ca2+鈣離子濃度400mg/L時阻碳酸鈣和磷酸鈣垢率依然可達到70%;在實驗用水pH為8.5左右、水浴溫度80℃~85℃、水浴時間10小時條件下,阻碳酸鈣、磷酸鈣垢率達:78%~82%、96%~99.5%。當復(fù)配型阻垢劑(MA-AMPS/PBTCA)用量為80mg/L,阻碳酸鈣垢率達94%,該阻垢劑與市售藥劑相比,具有較優(yōu)的阻垢性能,該產(chǎn)品滿足工業(yè)所需,生產(chǎn)成本低、無膦,可用作工業(yè)循環(huán)冷卻水的處理。采用FTIR和TG方法分別對阻垢劑和鈣垢進行了結(jié)構(gòu)表征和其熱穩(wěn)定性分析,結(jié)合XRD、SEM和FTIR表征的結(jié)果,探究了阻垢劑對阻CaCO3、Ca3(PO4)2垢的效果。表征結(jié)果顯示,該復(fù)配型阻垢劑中含有MA、AMPS和PBTCA三種物質(zhì)的結(jié)構(gòu)官能團,生成了MA-AMPS二元共聚物目標產(chǎn)物,該二元共聚物與PBTC A組成的是復(fù)配型阻垢劑。該復(fù)配型阻垢劑的熱分解溫度高達276℃,穩(wěn)定性良好,可在較高溫度條件下使用。該阻垢劑能抑制碳酸鈣方解石的形成而形成亞穩(wěn)態(tài)的球霰石,達到破壞磷酸鈣垢的正常生長、使其表面變得松散呈團簇的作用。阻垢過程的機理可能是:阻垢劑的加入使鈣垢結(jié)構(gòu)發(fā)生畸變,破壞了垢物表面,從而達到阻垢的效果。
[Abstract]:In order to promote the green chemical clean production technology and realize the sustainable development strategy, the research and development of new water treatment scale inhibitors for preventing the deterioration, scaling and corrosion of water quality in industrial circulating cooling water system is a difficult problem in the field of environmental protection. High alkalinity, high pH value and high hardness circulating cooling water system. The preparation methods of scale inhibitors were determined by experiments: water as solvent, redox system as initiator, maleic anhydride (MA) and 2-acrylamide-2-methylpropyl sulfonic acid (AMPS) as polymeric monomer, butane-2,2,4-tricarboxylic acid (PBTCA) as complex agent, using polymerization and compounding synchronization. The composite scale inhibitor MA-AMPS/PBTCA was prepared. The static deposition method was selected to evaluate the performance of the scale inhibitor. The single factor experiment was carried out to obtain the optimum range of each factor: the dosage of raw material MA, AMPS and PBTCA was 60%, 40% and 20%, the reaction temperature was 70 ~75 ~75 ~14%, and the dosage of initiator was 12%~14%. The results showed that the optimum reaction conditions were: m (MA: AMPS: PBTCA) = 5:2:3, 5:2:2, Oxidant Selection sodium persulfate, ammonium persulfate, the amount of initiator was 12%, reaction temperature was 80 C, 70 C, calcium carbonate inhibition, calcium phosphate scaling rate were obtained by orthogonal experiment. The results show that the scale inhibition rate of calcium carbonate and calcium phosphate can still reach 70% when Ca2+ concentration is 400 mg/L, and the scale inhibition rate of calcium phosphate can reach 78% ~ 82% and 96% ~ 99.5% when the pH of water is about 8.5, the temperature of water bath is 80 ~85 ~and the time of water bath is 10 hours. Compared with the commercial scale inhibitor, the scale inhibitor has better scale inhibition performance. The product meets the needs of industry, has low production cost and no phosphorus. It can be used for the treatment of industrial circulating cooling water. The structure and thermal stability of the scale inhibitor and calcium scale were characterized by FTIR and TG, respectively. The results of EM and FTIR characterization showed that the scale inhibitor contained three functional groups of MA, AMPS and PBTC A, and the target product of MA-AMPS binary copolymer was formed. The binary copolymer and PBTC A were composed of a composite scale inhibitor. The scale inhibitor can inhibit the formation of calcium carbonate calcite and form metastable aragonite, which can destroy the normal growth of calcium phosphate scale and make its surface loose and cluster. The mechanism of scale inhibition process may be: the addition of scale inhibitor makes calcium scale. The structure is distorted, and the scale surface is destroyed, so as to achieve the scale inhibition effect.
【學(xué)位授予單位】：湘潭大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TQ085.4
本文編號：2215773
[Abstract]:In order to promote the green chemical clean production technology and realize the sustainable development strategy, the research and development of new water treatment scale inhibitors for preventing the deterioration, scaling and corrosion of water quality in industrial circulating cooling water system is a difficult problem in the field of environmental protection. High alkalinity, high pH value and high hardness circulating cooling water system. The preparation methods of scale inhibitors were determined by experiments: water as solvent, redox system as initiator, maleic anhydride (MA) and 2-acrylamide-2-methylpropyl sulfonic acid (AMPS) as polymeric monomer, butane-2,2,4-tricarboxylic acid (PBTCA) as complex agent, using polymerization and compounding synchronization. The composite scale inhibitor MA-AMPS/PBTCA was prepared. The static deposition method was selected to evaluate the performance of the scale inhibitor. The single factor experiment was carried out to obtain the optimum range of each factor: the dosage of raw material MA, AMPS and PBTCA was 60%, 40% and 20%, the reaction temperature was 70 ~75 ~75 ~14%, and the dosage of initiator was 12%~14%. The results showed that the optimum reaction conditions were: m (MA: AMPS: PBTCA) = 5:2:3, 5:2:2, Oxidant Selection sodium persulfate, ammonium persulfate, the amount of initiator was 12%, reaction temperature was 80 C, 70 C, calcium carbonate inhibition, calcium phosphate scaling rate were obtained by orthogonal experiment. The results show that the scale inhibition rate of calcium carbonate and calcium phosphate can still reach 70% when Ca2+ concentration is 400 mg/L, and the scale inhibition rate of calcium phosphate can reach 78% ~ 82% and 96% ~ 99.5% when the pH of water is about 8.5, the temperature of water bath is 80 ~85 ~and the time of water bath is 10 hours. Compared with the commercial scale inhibitor, the scale inhibitor has better scale inhibition performance. The product meets the needs of industry, has low production cost and no phosphorus. It can be used for the treatment of industrial circulating cooling water. The structure and thermal stability of the scale inhibitor and calcium scale were characterized by FTIR and TG, respectively. The results of EM and FTIR characterization showed that the scale inhibitor contained three functional groups of MA, AMPS and PBTC A, and the target product of MA-AMPS binary copolymer was formed. The binary copolymer and PBTC A were composed of a composite scale inhibitor. The scale inhibitor can inhibit the formation of calcium carbonate calcite and form metastable aragonite, which can destroy the normal growth of calcium phosphate scale and make its surface loose and cluster. The mechanism of scale inhibition process may be: the addition of scale inhibitor makes calcium scale. The structure is distorted, and the scale surface is destroyed, so as to achieve the scale inhibition effect.
【學(xué)位授予單位】：湘潭大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TQ085.4
【參考文獻】
相關(guān)碩士學(xué)位論文 前1條
1 孟冠華;多功能水處理劑的合成及性能研究[D];南京工業(yè)大學(xué);2003年
，本文編號：2215773
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