Synthesis Of FCC Slurry-based COPNA Resin And Its Application In Electric Brush

As a byproduct obtained from FCC unit in refinary, FCC slurry is mainly burnt out as low-value heavy fuel oil. With short side chain, lower steric hindrance, high aromatic content and higher purity, FCC slurry is a good raw material for the synthesis of condensed poly-nuclear aromatic(COPNA) resin.In this paper, furfural was selected as an extracting solvent and used to extract aromatics from FCC slurry. COPNA resin was successfully synthesized from aromatic enriched component at relatively low temperature, with 1, 4-benzenedimethanol(PXG) as cross-linking agent and p-toluene sulfuric acid(PTS) as catalyst. Properties of the resulting COPNA resin, such as softening point, carbon residue and content of β resin, were systematically characterized. To achieve a definitive insight into the reaction mechanism, the critical characteristics of the resulting COPNA resin and raw material were purposely explored using FT-IR, 1H-NMR, vapor pressure osmometer(VPO), and elemental composition analysis. Structural parameters of starting raw material and obtained COPNA resin were calculated by improved B-L method, and then the average molecular models of starting raw material and COPNA resin were obtained. Carbonization process of COPNA-C resin was investigated by Miura integration method. In order to improve the heat resistence of as-made resin, COPNA-B resin was modified by added boric acid, the basic properties of the modified resin were studied and the modification mechanism was discussed. COPNA resin/graphite electric brushes were made from graphite while COPNA resin as binder, and their performances including mechanical property, hardness and resistivity were investigated.The results show that the reaction activity of starting oil is significantly increased after furfural extraction pretreatment. The synthetic mechanism of COPNA-B resin from aromatic enriched component is acid-catalyzed positive ion condensation polymerization. The average molecular weight of COPNA-B resin is 1466, and the average condensation degree is around 3. Weight loss of prepared COPNA-C resin during carbonization includes two sections, i.e. the crosslinking reaction between PXG and the resin moleculars occurred at 250-400 oC with 100-130 kJ mol-1 of the activation energy, and the dehydrogenation reaction among resin moleculars occurred at 400-550 oC with 140-180 kJ mol-1 of the activation energy. The addition of small amount of boric acid enhances the average molecular weight of COPNA resin, and significantly improves heat resistence of COPNA resin. The performances of the prepared COPNA resin/graphite electic brush have reached the same level of similar products abroad.