煤直接液化催化剂中总可溶性铁含量分析方法研究

Research on the Analysis Method of Total Soluble Iron Content in Coal Direct Liquefaction Catalyst

针对煤直接液化催化在煤直接液化工艺过程中的重要性和特殊性质,本论文通过研究煤直接液化催化剂中铁含量的分析过程和影响因素,包括样品取样量、盐酸的使用量、煮沸时间及固液分离方法,获取最佳的实验方案。研究发现,当盐酸量为25mL时,样品质量为0.250g,煮沸时间为5min时,选择抽滤法固液分离,分析效果最优,方法相对标准偏差(RSD,n=20)小于5%。该分析方法减少了分析过程中人为因素导致的结果重复性、再现性差等问题,对煤直接液化催化剂中铁含量的分析和煤直接液化催化剂质量控制有现实指导意义。

In view of the importance and special properties of the direct coal liquefaction catalyst,this paper studies the analysis process and the influencing factors of iron content in the direct coal liquefaction catalyst,including the sample size,the amount of hydrochloric acid used,boiling time and solid-liquid separation method,to obtain the best experimental program.It was found that when the amount of hydrochloric acid was 25 mL,the mass of sample was 0.250 g,and the boiling time was 5 min,the extraction-filtration method was the best method for solid-liquid separation.The relative standard deviation(RSD,n=20)of the method was less than 5%.The analysis method reduces the questions of repeatability and needy reproducibility caused by humaitnity factors in the analysis process.It is of practical significance to the analysis of iron content in coal direct liquefaction catalyst and the quality control of coal direct liquefaction catalyst.