煤与废塑料共液化及其供氢作用的研究

Study of Co-liquefaction and Hydrogen Donating of Coal with Waste Plastics

进行了一系列煤与废塑料的单独和共液化试验。各种塑料的单独液化试验发现 ,高密度聚乙烯 ( HDPE)比较难以液化 ,但在高温下可获得较高的油产率。使用钼灰( FAMo)作催化剂 ,进行先锋褐煤与废塑料共液化 (通常 1∶ 1混和 ) ,试验结果表明 :煤与低密度聚乙烯 ( LDPE)、聚丙烯、聚苯乙烯共液化的油产率高达 60 .3%～ 78.1 % ,转化率均达 95 %以上。与煤和塑料单独液化时油产率的加权平均值相比 ,煤与废塑料共液化试验的油产率增加 5 .1 %～ 2 2 .6% ,氢耗降低 7.7%～ 1 7.9%。反映出煤与废塑料在液化反应中具有协同效应 。

Polyethylene (PE), polypropylene (PP) and polystyrene (PS), respectively with coal, have been successfully converted to oil under typical direct liquefaction conditions(410～450℃, 60 min reaction time and 10 MPa of H 2 cold) . A series of liquefaction experiments were carried out using ground coal and plastic waste individually and in combination. Results for individual plastics showed that high density PE (HDPE), as a model plastics was more difficult to convert, however higher conversions could be obtained at igher temperatures. Co liquefaction reaction was perfermed on coal plastic mixtures (usually 1∶1mixtures) using a Chinese Xianfeng lignite with the fly ash of molybdenum concentrates calcined (FAMo) as catalyst. The oil yields except coal HDPE coliquefaction experiments were as high as 60.3 %～78.1 %, while the total conversions was over 95 %. Oil yields for coal plastic coliquefaction were higher, typically by 5.1 %～22.6 %, than the average of the oil yields for the coal and plastic alone. Hydrogen consumption was also reduced by 7.7 %～17.9 %, implying synergistic effects of coal and waste plastics and indicating the plastic played the role of a hydrogen donor in coliquefaction reaction.