Study On The Preparation Of Needle Coke By Pretreated FCC Slurry

The FCC decant oil is the ideal feedstock of some high value-added petroleum products, carbon materials for its rich aromatic component. For the current situation of China’s lack of needle coke, we conduct some research of the preparation of needle coke using FCC decant oil as the feedstock. In series of experiments we study about some different process of the enrichment of aromatic component, carry out the best conditions for the preparation of needle coke, and then test the performance of the needle coke product.The results show that after solvent extraction, the aromatic content will increase to a high level while the content of saturated hydrocarbons will reduced to a low level. But after the vacuum distillation treatment, each component of the oil won’t have a large change, and it is easy to generate asphaltenes. We also found that when using DMF as the solvent, liquid-solid and liquid-liquid separation can be completed in one step.Under the appropriate reaction conditions, different feedstock will convert to coke samples after the tank coking reaction. The samples are observed under a polarizing microscope. The cokes obtained by solvent extraction oils have good microstructure, as the anisotropic area presenting a wide area-flow line structure; but the cokes obtained by original decant oils and vacuum distillation treated oils will not have ideal microstructure. After calcined at1200℃, we analysis the elements, microstructure, XRD, true density, ash content and volatile of the calcined coke. By comparing with several commercial needle cokes, we find that the properties of calcined coke can meet the standards that required except for the sulfur content.