Investigations on CS2-Solube Fractions and Gasification Reactivity of Liquid-Phase Carbonization Cokes

Abstract

Two kinds of liquid-phase carbonization cokes (LPCCs) from vacuum residue and coal tar pitch were prepared at 350−500 °C, at which the carbonaceous mesophase appears typically. Investigations on elemental composition, surface morphology, extraction yield, CS2-soluble fraction, and gasification activity of LPCCs were mainly made. In the liquid-phase carbonization process, a large quantity of CS2-soluble fractions, which were reserved in the pores of LPCCs, were produced. These CS2-soluble fractions were abundant in alkanes and arenes and only contained a little quantity of cyclanes. The increasing carbonization temperature strongly promoted the production of arenes, with higher aromacity in the CS2-soluble fractions. After the CS2 extraction of LPCCs, two benefits for the use of LPCCs would be obtained: producing some organic compounds as byproducts and greatly enhancing their gasification activity, owing to the removal of CS2-soluble fractions and fine particles conglutinated on their pore surfaces. Therefore, the solvent extraction was a promising and excellent way for the pretreatment of LPCCs (such as petroleum coke and pitch coke) to promote their efficient uses.