环烷酸中脂肪酸含量测定方法的改进

The improvmecnt of the measurment about the quantity of grease aid in naphthenic acid

讨论了尿素络合酸碱“滴定法”测定从煤、柴油碱碴生产的环烷酸中脂肪酸含量的测定条件和干扰因素并与尿素络合“重量法”进行了比较,“滴定法”比“重量法”操作简单且操作耗时少,而精确度比“重量法”有所提高.该分析方法当环烷酸中脂肪酸的含量为1%～2%时,相对误差不大于6%,变异系数不大于5%;当环烷酸中脂肪酸的含量为1%～2%,而加标量为样品中脂肪酸含量的1倍左右时回收率80%左右.

The measuring conditions and disturption factors about when the quantity of grease acid in naph-thenic acid which comes from kerosene and diesel cut has been determined by urea complexing'acid - base titration method'have been discussed in this paper. Copmared the'acid - base titration method'with urea com-plexing'weight method', It is found out that the'acid - base titration method'is much simper in operation and needs less operating time, but has a little improvment inprecision. If the quantity of grease acid in naphthenic acid is 1-2% ,the relative error of the 'acid-base titration method'is within 6% and variable coefficent is within 5 % ; the rate of recovery is about 80 % when the quantity of grease acid in naphthenic acid is about 1 % -2% and the added scalar quantity is about 1 times of that in the sampe.