超临界水中煤与聚苯乙烯的共液化研究

摘要

在间歇式高压反应装置中,研究了兖州烟煤与塑料聚苯乙烯(PS)在超临界水中的共液化,考察了水/物料比(质量比10～30)、反应温度(360℃～430℃)和塑料添加量(10%～40%)对煤液化转化率及产物收率的影响.结果表明,随着水/物料比的增加,煤液化转化率先升高,之后变化不大;油气产率则呈上升的趋势.反应温度高于420℃,随着温度的升高,煤液化转化率和油气产率有明显上升的趋势,当温度为430℃时,得到最高转化率为31.2%、油气产率12.6%、沥青质产率18.6%.与煤、塑料单独液化油产率的加权平均值对比,塑料投加量小于20%时,油产率提高0.6%～2.7%,表明在超临界水体系中塑料的添加对煤的液化具有一定的协同作用.%Co-liquefaction of coal and polystyrene (PS) in supercritical water (SCW) was studied in an autoclave.The experiments were carried out to investigate the effects of water to reactant ratio( 10 ～ 30) (mass ratio), temperature (360 ℃ ～ 430 ℃ ) and the addition of plastic (10％ ～40％ ) (mass ratio) on the coal conversion, yields of asphaltenes, oil and gas.The results show that with the increasing ratio of water to reactant, the total coal conversion increases at first and then remains constantly; while the yield of oil and gas keeps increasing.The conversion of coal and the yield of oil and gas increase dramatically with the temperature increasing above 420 ℃.It is found that the conversion reaches the maximum value as 31.2％ at 430 ℃, while the yields of oil and gas, asphaltenes are 12.6％ and 18.6％, respectively.The yields of oil and gas for coliquefaction of coal and plastic are higher, typically by 0.6％ ～ 2.7％, than the weighted average oil and gas yields for the coal and plastic alone, which implies the synergistic effects on coal conversion.