Structure of expanded graphite and its use in the removal of oil from water

摘要

A hydrophobic and lyophobic particular vermicular structure of expanded graphite, possessing the property of absorbing large amounts of petroleum products is described. This expanded graphite is characterized by three main properties: (a) a specific density in the range of 0.003 - 0.1 g/ml; (b) a surface area in the range of 50-200 m2/g; and (c) closed pores in the range of 3% to 20%. It can be used in the form of particulate, pillows, blankets, booms or as a filter medium. The oil absorbed onto the expanded graphite can be released by pressure or recovered by solvent extraction.