绿色环保阻垢缓蚀剂的优化配置

发布时间：2018-01-25 03:12

本文关键词： 协同作用优化配置阻垢缓蚀效率　出处：《西安工程大学》2015年硕士论文　论文类型：学位论文

【摘要】：摘要：循环冷却水的结垢、腐蚀以及污水对水体的污染是工业循环冷却水主要的问题。本文以尿素和马来酸酐作为原料合成PASP,通过与其他天然或高效阻垢缓蚀剂的优化配置,制备多功能绿色水处理剂。并在模拟的高浓缩倍数循环冷却水中,对单一和优化配置的阻垢缓蚀剂的阻垢缓蚀性能进行评定。通过SEM法和红外光谱法对垢样和腐蚀产物进行表征和对阻垢缓蚀机理进行一定的研究。实验选取PASP、PAA、葡萄糖酸钠和单宁酸作为实验的水处理剂。本文采用碳酸钙阻垢法和鼓泡法进行阻垢性能评价,通过对其阻垢剂浓度、钙离子浓度、水浴温度、水浴时间和复配比例等因素的研究表明：PASP和PAA具有较好的阻垢性能,其阻垢效率达到83%和90%左右；葡萄糖酸钠的阻垢效率较低,但是具有一定的分散作用；单宁酸具有一定的阻垢作用,但因其本身性质不是很稳定,最后用氢氧化钠对其进行改性,改性后的阻垢性能稳定且阻垢效率达到60%。PASP+PAA具有协同作用,其阻垢效率能达到92%；而PASP+葡萄糖酸钠、PASP+单宁酸钠在阻垢方面不存在协同作用,但是其阻垢效率明显大于葡萄糖酸钠或者单宁酸阻垢时的效率。在作用机理方面,PASP、PASP+PAA和PASP+单宁酸钠除了螯合增容作用外,主要是由于阻垢剂吸附在碳酸钙晶体的表面,使晶体发生畸变。PASP+葡萄糖酸钠中除了螯合增容和吸附作用之外,因葡萄糖酸钠具有凝聚与分散的作用,垢样易于清洗。采用静态挂片法和旋转挂片法对缓蚀性能进行评价,通过对其阻垢剂浓度、pH、水浴温度、水浴时间以及复配比例的研究表明：PASP和PAA具有稳定且较好的缓蚀效率,其缓蚀效率达到80%和70%；葡萄糖酸钠在缓蚀方面效率较高达到80%；单宁酸和改性后的单宁酸钠具有一定的缓蚀作用,且单宁酸钠的缓蚀率大于单宁酸。在复配药剂中,PASP+PAA、PASP+葡萄糖酸钠和PASP+单宁酸钠均有明显的协同作用。在作用机理方面,PASP+PAA在碳钢表面有吸附作用,使碳钢表面形成了一层保护膜,从而有效的抑制腐蚀。]PASP+葡萄糖酸钠和PASP+单宁酸钠主要是在碳钢表面形成一层沉淀膜对金属表面进行保护。
[Abstract]:Abstract: scale, corrosion and sewage pollution of circulating cooling water are the main problems of industrial circulating cooling water. In this paper, urea and maleic anhydride are used as raw materials to synthesize PASP. The multifunctional green water treatment agent was prepared by optimizing the configuration of the scale and corrosion inhibitor with other natural or high efficiency scale and corrosion inhibitors. The multi-function green water treatment agent was used in the simulated high concentration multiple circulating cooling water. The scale and corrosion inhibition performance of single and optimized scale and corrosion inhibitor was evaluated. The scale samples and corrosion products were characterized by SEM and infrared spectroscopy, and the mechanism of scale and corrosion inhibition was studied. PASP. PAA, sodium gluconate and tannic acid were used as experimental water treatment agents. The scale inhibition performance of PAA, sodium gluconate and tannic acid was evaluated by using calcium carbonate scale inhibition method and bubbling method. The concentration of scale inhibitor, calcium ion concentration and water bath temperature were evaluated. The study on the water bath time and the ratio of water bath to PAA shows that the scale inhibition efficiency is about 83% and 90%, and the scale inhibition efficiency of the two groups is about 83% and 90%. The scale inhibition efficiency of sodium gluconate is low, but it has some dispersing effect. Tannic acid has a certain scale inhibition effect, but its properties are not very stable, finally it was modified with sodium hydroxide. The modified scale inhibition performance is stable and the scale inhibition efficiency reaches 60%. PASP PAA has synergistic effect, and its scale inhibition efficiency can reach 92%. However, PASP sodium gluconate has no synergistic effect on scale inhibition, but its scale inhibition efficiency is obviously higher than that of sodium gluconate or tannic acid. In addition to chelating compatibilization, PASP PAA and PASP sodium tannin are mainly due to the adsorption of scale inhibitor on the surface of calcium carbonate crystal. In addition to chelating compatibilization and adsorption, sodium gluconate has the function of agglomeration and dispersion. The scale sample is easy to be cleaned. The corrosion inhibition performance is evaluated by static hanging plate method and rotating hanging plate method. The scale inhibitor concentration is pH and the water bath temperature is determined. The study on the water bath time and the ratio of water bath to PAA shows that the water bath and PAA have stable and good corrosion inhibition efficiency, and the inhibition efficiency reaches 80% and 70 respectively. The corrosion inhibition efficiency of sodium gluconate is 80%. Tannic acid and modified sodium tannate have certain inhibition effect, and the inhibition rate of sodium tannin is higher than that of tannic acid. PASP sodium gluconate and PASP sodium tannate have obvious synergistic effects. PASP PAA adsorbs on the surface of carbon steel in the mechanism of action. A protective film was formed on the surface of carbon steel, which effectively inhibited corrosion.] Sodium PASP gluconate and sodium PASP tannate mainly formed a precipitation film on the surface of carbon steel to protect the metal surface.
【学位授予单位】：西安工程大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ085.4

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