桦甸页岩油泥溶剂萃取特性研究

利用N-甲基吡咯烷酮-二硫化碳(NMP-CS2)、四氢呋喃(THF)、乙醇(EA)对桦甸页岩油泥进行温和条件下萃取。对各次萃取液进行GC-MS检测,并分析不同溶剂下萃取物的组分变化。对各次萃余物进行工业分析、电镜扫描分析(SEM)、X射线衍射分析(XRD),得到萃取物矿物组成及物理形貌变化。结果表明:三组溶剂萃取率依次为89.53%(EA)、81.29%(THF)、70.58%(NMP-CS2)。EA萃余物团聚程度最轻,颗粒细散,分离效果明显。各溶剂萃取物主要为C11至C35之间的饱和烷烃,其中THF对油泥中重质烃组分具有较强的溶出能力。油泥萃余物中固体物质主要为油页岩半焦和飞灰混合物。并且观察到EA萃余物中伊蒙混层的消失。

Research on characteristics of solvent extraction of Huadian oil shale sludge

Three organic solvents, including N-methyl pyrrolidone-CS2 (NMP-CS2), Tetrahydrofuran (THF) and ethanol (EA) were used in mild conditions to extract shale oil from oil shale sludge collected from Huadian City. Extracts were subject to GC-MS analysis. Remaining solids went through proximate analysis, scanning electron microscope (SEM) analysis, and X-ray diffraction (XRD) analysis. Results showed that EA, THF, and NMP-CS2 achieved extraction yields of 89.53%, 81.29%, and 70.58%, respectively. Meanwhile SEM analysis showed that the remaining solid upon ethanol extraction was associated with completely dispersed particles structure. It was concluded from GC-MS analysis that these three extracts mainly contained aliphatic hydrocarbons continuously ranging from C11 to C35, and that THF was more suitable for extracting heavy hydrocarbons, compared to the other two solvents. Proximate analysis and XRD analysis concluded that the solid contained in oil shale sludge was basically the mixture of oil shale char and fly ash, and that upon ethanol extraction, mineral types basically remained the same, except the disappearance of illite.