二元MA-AMPS共聚物与有机膦酸PBTCA复配的新型阻垢剂制备及性能研究
发布时间：2018-08-31 18:17
【摘要】：为推进绿色化学清洁生产技术,实现可持续发展战略,研究开发用于防止工业循环冷却水系统中水质变质、结垢、腐蚀等问题的新型水处理阻垢剂是目前环保领域广泛关注的难点课题。本文开发了一种新型的复配型阻垢剂,可用于高温、高碱度、高pH值和高硬度循环冷却水系统。经过试验确定了阻垢剂的制备方法:以水为溶剂,氧化还原体系为引发剂,马来酸酐(MA)和2-丙烯酰胺-2-甲基丙基磺酸(AMPS)为聚合单体,2-膦酸丁烷-1,2,4-三羧酸(PBTCA)为复配剂,采用聚合与复配同步进行的方式,制得了复配型阻垢剂MA-AMPS/PBTCA。选择静态沉积实验方法评价阻垢剂的性能,通过对制备工艺条件进行单因素实验,得出各因素的较优范围:原料MA、AMPS和PBTC A用量为60%、40%和20%,反应温度70℃~75℃,引发剂用量12%~14%。参考单因素实验结果,选取四个主要因素和三个参数水平进行正交实验,分别以阻碳酸钙、磷酸钙垢率为指标得到最佳反应条件为:m(MA:AMPS:PBTCA)=5:2:3、5:2:2,氧化剂选择过硫酸钠、过硫酸铵,引发剂用量均选12%,反应温度80℃、70℃,阻碳酸钙、磷酸钙垢率达79%、95%以上。对应用条件的考察结果,当Ca2+钙离子浓度400mg/L时阻碳酸钙和磷酸钙垢率依然可达到70%;在实验用水pH为8.5左右、水浴温度80℃~85℃、水浴时间10小时条件下,阻碳酸钙、磷酸钙垢率达:78%~82%、96%~99.5%。当复配型阻垢剂(MA-AMPS/PBTCA)用量为80mg/L,阻碳酸钙垢率达94%,该阻垢剂与市售药剂相比,具有较优的阻垢性能,该产品满足工业所需,生产成本低、无膦,可用作工业循环冷却水的处理。采用FTIR和TG方法分别对阻垢剂和钙垢进行了结构表征和其热稳定性分析,结合XRD、SEM和FTIR表征的结果,探究了阻垢剂对阻CaCO3、Ca3(PO4)2垢的效果。表征结果显示,该复配型阻垢剂中含有MA、AMPS和PBTCA三种物质的结构官能团,生成了MA-AMPS二元共聚物目标产物,该二元共聚物与PBTC A组成的是复配型阻垢剂。该复配型阻垢剂的热分解温度高达276℃,稳定性良好,可在较高温度条件下使用。该阻垢剂能抑制碳酸钙方解石的形成而形成亚稳态的球霰石,达到破坏磷酸钙垢的正常生长、使其表面变得松散呈团簇的作用。阻垢过程的机理可能是:阻垢剂的加入使钙垢结构发生畸变,破坏了垢物表面,从而达到阻垢的效果。
[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.
【学位授予单位】：湘潭大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ085.4
本文编号：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.
【学位授予单位】：湘潭大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ085.4
【参考文献】
相关硕士学位论文 前1条
1 孟冠华;多功能水处理剂的合成及性能研究[D];南京工业大学;2003年
，本文编号：2215773
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