二甲基氨基甲叉二膦酸氮氧化物的合成

Synthesis on Dimethyl Aminomethane Diphosphonic Acid

以二甲基氨基甲叉二膦酸(DMMP)为原料,双氧水为氧化剂合成二甲基氨基甲叉二膦酸氮氧化物(DMMPO)。研究了原料配比、温度、时间及合成时pH值等条件对目标产物阻磷酸钙垢效果的影响,结果表明:n(DMMP)∶n(H2O2)=1∶3、反应温度为75℃、反应时间为2.5 h,并控制pH值为9左右时合成的DMMPO静态阻垢效果最好。通过IR和31P-NMR对产物进行了结构鉴定,同时对产品进行了活性物含量、亚磷酸根和磷酸根含量的测定,直接合成产物中活性组分含量为22.7%,亚磷酸根和磷酸根含量均小于0.1%。

Dimethyl aminomethane diphosphonic acid N - oxide （DMMPO） was synthesized by DMMP and hydrogen peroxide. From the single - factor the optimized process for DMMPO was that n （DMMP） ： n （H202） = 1 ： 3, and reacted at 75 ℃ for 2.5 h with pH 9 under which the product had the best static anti - scale effect. Its structure was characterized by IR, ^31P-NMR. At the same time, the amounts of active compound, phosphorous and phosphate radical were analyzed. The amount of active compound was 22.7 % whereas the amount of phosphorous and phosphate radical were both less than 0.1%.