NTS螯合剂研制

Study on Preparation and Application of NTS

研究了用氯乙酸、氯化铵、氢氧化钠合成螯合剂次氨基三乙酸钠（ＮＴＳ）的方法，考察了反应温度、ｐＨ值对ＮＴＳ收率的影响，得出了最佳合成条件。在配料比氯乙酸∶氯化铵＝３∶１．０２（摩尔比）、反应温度为７０℃、ｐＨ＝１．０时，ＮＴＳ收率达到７５％以上。这种螯合剂用于常规酸化处理中防止铁离子形成氢氧化铁，实验结果表明。

A chelating agent,nitrilotriacetic acid sodium(NTS),was prepared from ClCH 2COOH,NH 4Cl and NaOH.The influences of reaction temperature and pH value of solution on the yield were investigated.The yield is over 75% under the optimum synthesis conditions(ClCH 2COOH∶NH 4Cl=3∶1.02(mol),pH=1.0,70℃,2 h).The chelating agent can be used in conventional acid treatment to prevent the formation of Fe(OH) 3,and the experimental results showed that it was a good ferric ions stabilizer.