超声萃取中低温煤焦油轻质油中酚类化合物研究

针对陕北榆林地区中低温煤焦油利用率低、环境污染严重等问题,以陕北榆林地区中低温煤焦油轻质油为原料,丙三醇水溶液为萃取剂,采用超声萃取法萃取中低温煤焦油轻质油中的酚类化合物,考察丙三醇添加量、丙三醇水溶液质量分数、超声温度等工艺条件对酚类化合物萃取率的影响。结果表明,丙三醇添加量对萃取结果影响最大,其次是丙三醇水溶液质量分数,超声温度对萃取结果的影响较小。最佳萃取条件为:丙三醇与轻质油质量比3.5∶1,丙三醇水溶液质量分数25%,萃取温度55℃,超声频率25 k Hz,酚类化合物萃取率高达93.9%。 In order to improve utilization rate of medium and low temperature coal tar and reduce environmental pollution,phenolic compounds extraction experiments were conducted. The light oil in medium and low temperature coal tar was adopted as raw material which were extracted by ultrasonic extraction technique,glycerin solution was selected as extractant. The operation condition,such as mass ratio of glycerin to feedstock,content of glycerin solution,and temperature were studied by orthogonal test( L934) when the ultrasonic frequency was 25 k Hz. Glycerin addition was the greatest impact on extraction rate,followed by the content of glycerin solution and temperature. The optional extraction conditions were that,the mass ratio of glycerin to feedstock was 3. 5 ∶ 1,the water content of glycerin solution was 25%,the temperature was 55 ℃,the ultrasonic frequency was 25 k Hz. Under the optional conditions,the extraction rate was 93. 9%