膦酰基阻垢剂PMAAAP的制备及其阻垢机理分析

Synthesis and Application of Phosphono Scale Inhibitor (PMAAAP) and Their Scale Inhibition Mechanism Research

摘要:

以马来酸酐、丙烯酸和次磷酸钠为主要原料，采用聚合法制备膦酰基阻垢剂——膦基马来酸酐-丙烯酸共聚物（PMAAAP），考察了其在不同条件下的阻垢性能，通过XRD分析其钙沉淀物的晶体结构，利用SEM揭示其钙沉淀物的形貌特征，通过电导率-t动态关系揭示了碳酸钙垢结晶过程。结果表明：当投加量为25mg/L、水温30~45℃、pH=8时，其对碳酸钙的最大阻垢率近100%，对磷酸钙的最大阻垢率为60.87%；XRD显示加入PMAAAP后碳酸钙晶体中方解石结构大量减少，同时出现呈不稳定状态的球霰石晶体结构；SEM显示加入PMAAAP后碳酸钙的形貌呈不规则形状；通过测定溶液中电导率值的变化可知PMAAAP明显抑制了碳酸钙沉淀的形成。制备的PMAAAP可作为一种高效的低磷阻垢剂应用于工业循环冷却水系统中。

Abstract:

Phosphono Scale Inhibitor (PMAAAP) was synthesized through polymerization reaction using maleic anhydride, acrylic acid and sodium hypophosphite as raw materials. The scale inhibition performance of PMAAAP（Phosphono Maleic Anhydride Acrylic Acid Polymer, PMAAAP） under different conditions was investigated. The crystal structure of calcium precipitation was analyzed by XRD and shape characteristic of calcium precipitation was revealed by SEM. The result showed that the maxium calcium carbonate scale inhibition rate is 100% and the maxium calcium phosphate scale inhibition rate is 60.87% under the conditions of dosage is 25 mg/L, pH is 8 and water temperature from 30℃ to 45℃. XRD revealed that the Calcite structure in Calcium carbonate crystal decreased and the unstable vaterite structure appeared. SEM revealed that shape characteristic of calcium carbonate present amorphous. Determination the solution conductivity showed PMAAAP obviously inhibit the formation of calcium carbonate deposits. PMAAAP as an efficient low phosphorus scale inhibitor could be used in industrial cooling water system.