呼伦贝尔褐煤溶剂萃取及萃余煤的双氧水氧化产物分析

Solvent Extraction of Hulunbeier Lignite and Oxidation of Coal Extracted Residue with Hydrogen Peroxide

以CS2、乙醇和丙酮作为溶剂,对呼伦贝尔褐煤进行连续萃取,并利用气相色谱/质谱联用(GC/MS)技术对萃取物进行分析。结果表明:CS2萃取物主要由长链脂肪烃和芳烃组成,而这些脂肪烃存在于3种溶剂萃取物中。在40℃条件下,用H2O2溶液采用恒温水浴和超声两种方式氧化萃余煤,超声条件下氧化剧烈,并用FTIR分析了原煤、萃余煤、氧化煤的化学结构的变化。氧化后的水溶物用乙酸乙酯萃取后,用GC/MS检测萃取物,恒温水浴氧化可以检测到30种化合物,而超声氧化只检测到14种,且都是以酯类为主。

Hulunbeier lignite was extracted using CS2, ethanol and acetone as solvent and the coal extract residues were analyzed with GC/MS. The results showed that CS2 extracts mainly consisted of long chain aliphatic hydrocarbon and aromatic hydrocarbon. Aliphatic hydrocarbon existed in the three solvent extracts. Coal extracted residue was oxidized for 4h at 40 ℃ with hydrogen peroxide at a constant temperature in a water bath with magnetic stirrer and ultrasonic bath, respectively. The reaction in ultrasonic bath was sharp. The chemical structure changes of raw coal, coal extracted residue and oxidized coal were analyzed using FTIR. The water soluble products were extracted extracts detected 30 compounds through oxidation in water bath abundance, while 14 compounds were identified in ultrasonic bath. using ethyl acetate. The GC/MS analysis of ethyl acetate with magnetic stirrer, among which esters were in higher