The sorption behaviors of four kinds of heavy oils into exfoliated graphites with different bulk densities were studied. The maximum sorption capacity of an exfoliated graphite with a bulk density of 6 kg/m(3) was found to be suprisingly high, 86 g of A-grade heavy oil and 76 g of crude oil per 1 g of exfoliated graphite, respectively, and also its sorption occured very rapidly, i.e. within 2 min. Sorption capacity was found to depend strongly on the bulk density and pore volume of the exfoliated graphite and the time it took to reach maximum sorption, as well as sorption capacity, as an exfoliated graphite depended strongly on the grade of heavy oil. Heavy oils sorbed into the exfoliated graphite could be recovered either by a simple compression or suction filtration with a recovery ratio of 60-80%. Recovered oils showed no difference in molecular weight and hydrocarbon constituent from the original. No increase of the water content in the recovered oils was detected, suggesting preferential sorption of heavy oil into exfoliated graphite. This result indicates clearly that the oils recovered from the exfoliated graphite can be recycled. From the present work, exfoliated graphite with low bulk density is a promising material for the sorption and recovery of spilled heavy oil. (C) 2000 Elsevier Science Ltd. All rights reserved. [References: 16]
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机译：研究了四种重油在不同堆积密度的片状石墨中的吸附行为。发现堆积密度为6 kg / m（3）的片状石墨的最大吸附容量非常高，每1克片状石墨分别有86克A级重油和76克原油，并且其吸附非常迅速地发生，即在2分钟内。发现吸附能力在很大程度上取决于片状石墨的堆积密度和孔体积，以及达到最大吸附所需的时间以及吸附能力，因为片状石墨强烈依赖于重油的等级。吸附在片状石墨中的重油可以通过简单的压缩或抽滤进行回收，回收率为60-80％。回收的油与原始油相比，分子量和烃成分无差异。在回收的油中未检测到水含量的增加，表明重油优先吸附在剥离的石墨中。该结果清楚地表明，从片状石墨中回收的油可以再循环。从目前的工作来看，低堆积密度的片状石墨是用于吸附和回收溢出的重油的有前途的材料。 （C）2000 Elsevier ScienceLtd。保留所有权利。 [参考：16]
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