尿素生产工艺物料中二氧化碳测定方法的改进

Improvement on Method for Determination of Carbon Dioxide in Process Materials in Urea Production

通过改变尿素生产工艺物料中二氧化碳测定过程中的取样量、标准溶液浓度和试剂加入量以及滴定过程采用电磁自动搅拌和精密酸度计替代指示剂指示滴定终点等措施 ,改进了二氧化碳测定方法 ,提高了其准确度 ,且操作更加简便 ,缩短了分析滴定时间 ,并降低了分析成本。改进后的分析方法变异系数小于 4 %,加标回收率 98%～ 1 0 1 %,相对偏差降至 1 %以下。

The method for the determination of carbon dioxide is improved by changing the sample size, the standard solution concentration and the volume of the reagent added during the determination of carbon dioxide in the process materials in urea production, and by adopting magretic auto-stirring and precision acidometer to replace indication of end point of titration with an indicator, in titration; thus, the accuracy in carbon dioxide determination is improved, the operation is more convenient and simpler, the titration time in analysis is shortened, and the analytical cost is reduced. The variation coefficient of this modified analytical method is less than 4%, the tagged recovery is 98%～101%, and the relative deviation decreases to below 1%.