Needle coke from petroleum residue- a study of the thermal behavior of the middle fraction of the residue

It is generally difficult to produce needle coke by simply coking petroleum residue because the residue is an extremely complex feedstock with a wide molecular weight distribution. Solvent extraction was employed to modify the residue and the coking properties of extracts A and B, both of which have low impurity content and narrow molecular weight distribution, are given. Results show that cokes from extracts A and B have good optical orientation and a high degree of anisotropy.