膦酰基羧酸的合成方法与阻垢性能的关系

采用4种方法合成了膦酰基羧酸聚合物(POCA):①以次磷酸钠与丙酮反应生成中间体,再与丙烯酸(AA)及2 丙烯酰胺基 2 甲基丙磺酸(AMPS)聚合,生成物用次氯酸钠氧化得目标产物;②亚磷酸二乙酯与AA、AMPS在二特丁基过氧化物引发剂存在下进行调聚反应,然后用浓盐酸水解。③AA与AMPS的共聚物与三氯化磷在环丁砜中反应。④以双氧水为引发剂,AA、AMPS与亚磷酸在水溶液中聚合反应得目标产物。同时研究了不同方法下合成的产品对碳酸钙、磷酸钙、硫酸钙和锌盐沉积的抑制能力。结果表明:①随加药量的增加,不同方法合成出的4种产品对碳酸钙的抑制能力提高,POCA-1和POCA-2的性能相当,优于POCA-4和POCA-3;②不同方法合成出的产品对磷酸钙的抑制能力存在"临界值"效应,即当加药浓度低时阻垢能力较差,当加药质量浓度超过一定值后,抑制能力迅速提高到100%,方法1,3和4合成出的产品临界值为20mg/L,方法2为15mg/L;③4种产品对硫酸钙沉淀均有较好的抑制能力;随加药量的增加,4种产品对硫酸钙的抑制能力提高。产品POCA-1,POCA-2和POCA-3性能相当;④4种方法合成的产品对锌盐沉积具有优良的抑制作用,随加药量的增加,其稳定锌盐的能力提高,其中POCA-2和POCA-4的性能基本相当,优于POCA-1和POCA-3。考虑产品的综合性能,方法2所合成的产品?

Relationship between Synthetic Method and Scaling Inhibition Performance of Phosphonocarboxylic Acid

Cotelpmer of phosphonocarboxylic acid(POCA) was synthesized by four methods.①Sodium hypophosphite reacted with acetone,then polymerized with acrylic acid(AA) and 2 acrylamido 2 methylpropanesulfonic acid (AMPS) and the product was oxidized by sodium hypochlorite.②Using di tert butyl peroxide as initiator,di ethyl phosphite reacted with AA and AMPS,then hydrolyzed with conc. hydrochloric acid.③The copolymer of AA and AMPS reacted with PCl3 in sulfolane.④Using H2O2 as initiator,H3PO3 reacted with AA and AMPS.The performances of the products from four different methods(denoted by POCA-1,POCA-2,POCA-3,POCA-4) to inhibit scaling of CaCO3,Ca3(PO4)2,CaSO4 and Zn(OH)2 were studied.The ability of scaling inhibition toward CaCO3 enhanced as the concentration of products increased,POCA-1 and POCA-2 being better than POCA-3 and POCA-4.There existed "critial value"effect in scaling inhibition toward Ca3(PO4)2,i.e. when the concentration is low,the ability is bad,but when the concentration surpasses some value,the ability of scaling inhibition increases rapidly to 100%.The critical value of POCA-1,POCA-3 and POCA-4 was 20 mg/L and that of POCA-2 was 15 mg/L.The ability of scaling inhibition of four products toward CaSO4 was good,and the ability enhanced as the concentration of products increased,POCA-1,POCA-2 and POCA-3 being better than POCA-4.The ability of scaling inhibition of four products toward zinc salt was good,and the ability enhanced as the concentration of products increased,POCA-2 and POCA-4 being better than POCA-1and POCA-3.Thus the second method was selected as the prior method of synthesizing phosphonocarboxylic acid cotelomer.