Boiling bed hydrogenation
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Which boiling-bed hydrogenation units are currently in operation across the country? Which process packages are being used everywhere! What is the principle of fluidized bed hydrogenation? Thank you to all fellow sailors!
There are no units in China that operate using sludge oil fluidized-bed hydrogenation; the patent holders mainly fall into two groups: Axens and Chevron. Principle: For the hydroprocessing of boiling-bed residue, thermal cracking reactions are the dominant reactions. In a fluidized bed reactor, the catalyst bed is in a state of complete mixing; the gas, liquid, and solid phases are thoroughly mixed, ensuring thorough contact between the catalyst and the feed oil as well as hydrogen, thereby resulting in high reaction kinetics efficiency ； There is no issue of impurities clogging the bed; the reactor pressure remains low and does not change throughout the operation cycle ； It is possible to process low-quality raw materials ； The interior of the reactor is essentially at an isothermal state; there is no need to inject cold hydrogen, and local overheating does not occur.
Patent holders: Axens and Chevron. Its principle is the same as that of a fixed-bed reactor. In China, projects such as Shenhua’s coal-to-oil production utilize bubbling beds for coal tar hydrogenation, but many of such systems are no longer in operation today.
Thank you for your reply. Could you share some information on AXENS’ H-OIL technology? There is no need for cold hydrogen injection; initially, hydrogen and residue are mixed to raise the temperature, after which they are fed into the reactor from the bottom, with catalyst being added from the top – that’s how the reaction takes place, right? If cracking is the main process, what technical aspects need to be paid attention to?