NEW APPROACHES TO DEEP DESULFURIZATION FOR ULTRA – CLEAN GASOLINE, DIESEL FUEL AND JET FUEL
CLASSIFICATION OF DESULFURIZATION PROCESSES BASED ON ORGANOSULFUR COMPOUND TRANSFORMATION
Desulfurization technologies classified by nature of a key process to remove sulfur
Gasoline production
Formation of sulfur compounds in FCC gasoline
Formation of 2,5-dimethylthiophene through the addition of H2S to hex-1-ene
Typical organosulfur compounds and their hydrotreating pathway
Different approaches to improve HDS catalyst performance
Increased amount of active component;
change nature of active sites (P addition, nitride, noble metal, etc.)
application of advanced support (TiO2-Al2O3, ASA carbon, zeolite, etc.)
change HDS reaction route
application of difference precursons (carbonyl, chelate compounds, etc.)
catalysts preparation using sol – gel techniques;
different activetion/sulfidation techniques
Possible pathways for the transformation of 2-methylthiophene over sulfided CoMo catalysts
Hydrodesulfurization reaction mechanisms
Hydrodesulfurization reaction mechanisms
Mechanism of reactive adsorption desulfurization process
ExxonMobil’s SCANfining process for selective naphtha HDS
Relative activities of SCANfining catalyst for selective cat naphtha HDS
Prime G + process developed IFP
General performance of Prime G + process developed by IFP
Deep HDS combined with octane recovery processing
ExxonMobil’ OCTGain process of selective naphta HDS
Design approaches to deep desulfurization of diesel
Approaches to ultra-deep desulfurization include:
1, improving catalytic activity by new catalyst formulation for HDS of 4,6-DMDBT;
2, tailoring reaction and process condition;
3, designing new reactor configurations;
4, developing new processes.

 Design approaches for ultra-deep HDS focus on how to remove 4,6-DMDBT more effective. One or more approaches may be employed by a refinery to meet the challenges of producing ultra-clean fuels at affordable cost
Design approaches to deeep desulfurzation of diesel
Flow scheme of CDTech’s CDHydro + CDHDS for naphtha desulfurization
ConocoPhillip’s S-Zorb sulfur removal process based on solid adsorbent and its continuous regeneration
Relative activity of the new NEBULA and STARS catalysts compared to conventional CoMo/Al2O3 developed over the last 50 years