CAJ | 학술논문

采用正戊烷溶剂,在超临界状态下,于220℃和5MPa～15MPa循序升压条件下,将高温煤焦油萃取分馏为10个液相窄馏分和1个固相沥青产物;切割深度达78.36%,萃余沥青收率为21.64%,明显低于常规蒸馏沥青收率.研究发现,所用高温煤焦油的初馏分萃取收率最高,随着萃取压力的增加,较低压力段一次萃取液相馏分的收率迅速减少;压力达到10MPa,液相馏分总收率趋于峰值.元素分析和色质联用分析数据表明,随着萃取压力的增加,一次萃取获得窄馏分的碳氢原子比逐渐增加,平均环数和相对分子质量均逐渐增大,萃取馏分逐渐变重.
채용정무완용제,재초림계상태하,우220℃화5MPa～15MPa순서승압조건하,장고온매초유췌취분류위10개액상착류분화1개고상력청산물;절할심도체78.36%,췌여력청수솔위21.64%,명현저우상규증류력청수솔.연구발현,소용고온매초유적초류분췌취수솔최고,수착췌취압력적증가,교저압력단일차췌취액상류분적수솔신속감소;압력체도10MPa,액상류분총수솔추우봉치.원소분석화색질련용분석수거표명,수착췌취압력적증가,일차췌취획득착류분적탄경원자비축점증가,평균배수화상대분자질량균축점증대,췌취류분축점변중.
The high-temperature coal tar sample was separated into 10 narrow oil fractions and one solid-phase pitch product by supercritical fluid extraction and fractionation using n-pentane as solvent at 220℃ and pressure from 5MPa to 15MPa. Results show that the accumulative yields increase with the extract pressure especially at the lower pressures, and the yield increase rate decrease gradually. The total yield of the oil extract is 78.36%, and the raffinate pitch yield is 21.64% which is far below that of the conventional distillation. Elemental analysis and chromatograph-mass spectrometer analysis show that with the increase of the extraction pressure, the atomic ratio of carbon to hydrogen, the average ring numbers, as well as the average molecular weight of narrow oil fractions increase gradually.