柴油非加氢脱硫技术研究中样品的选择

Testing sample choice for non-hydrodesulfurization of diesels

利用气相色谱/原子发射光谱检测器(GC/AED),对小型加氢装置的加氢脱硫柴油样品及氧化/萃取前后样品油中含硫化合物进行了分析,对色谱图中出现的几个可疑峰进行了分析和推测,表明这几个峰是由元素硫产生的,并通过无硫油样中加入硫磺和对样品进行汞洗等实验进行了验证。此外,对于加氢柴油中元素硫产生原因以及对硫质量分数测定和对实验分析的影响,在氧化脱硫等非加氢脱硫实验中样品的选择等问题进行了讨论。

By means of GC-AED, the sulfur-containing compounds presented in the hydrotreated diesels obtained from bench-scale reactor were analyzed, and several questionable peaks were found in the chromatograms. The same questionable peaks were also found in the chromatograms of diesels before and after oxidation and extraction. By the analysis and conjecture it is thought to be the elemental sulfur's peak. Through the analysis of the sample by adding elemental sulfur into sulfur-free oils and washing the object diesels with mercury, these questionable peaks were identified as elemental sulfur. The reason for elemental sulfur formation in the hydrotreated diesels and the effect of elemental sulfur on the analysis of sulfur content of hydrotreated diesels are discussed in this paper. Moreover, if the diesels containing elemental sulfur and/or H2S were selected as samples in non-hydrodesulfurization test, such as oxidative desulfurization test, a wrong conclusion might be made due to the difficulties of removing elemental sulfur by oxidation/extraction. So the diesels not containing elemental sulfur and/or H2S should be chosen as the samples in non-hydrodesulfurization test.