High-temperature reduction problem of catalysts in gasoline and diesel hydrogenation units
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Pre-sulfidization is carried out when the hydrogenation unit is put into operation in order to enhance catalyst activity. Under high-temperature and hydrogen conditions, the catalyst can be reduced from its sulfided state. Experts, in terms of operation management, what concentration of hydrogen sulfide in the recycle hydrogen should be maintained during normal production to prevent such reduction, and what should be the purity of hydrogen? To what temperature does it drop after presulfurization, and what level should the hydrogen sulfide concentration in the circulating hydrogen be maintained at? How to operate it?
The initial hydrogen reduction temperature is about 160°C, and the rapid hydrogen reduction temperature is about 260°C. During the catalyst sulfidation completion and passivation phases, the H2S concentration in the control system should generally remain at no less than 0.1%