Abstract: By deep analysis of the catalyst deactivation mechanism and reasons for pressure drop and catalyst bed hot point, RHT residue hydrodesulfurization technology with long operation cycle is developed and applied. Series catalysts with good anti-carbon deposition and high capacity for metal deposition were developed. RHT series catalyst showed good activity and excellent activity stability in many industrial applications and created huge economic efficiency for refineries.

Key words: RHT technology, residue hydrotreating, operation cycle, industrial application