| 摘要 |
<p>Catalyst is transferred to and from a relatively high pressure moving-bed reactor through pressurized, liquid filled lock hoppers. A vertically segmented lock hopper is first filled with liquid and then raised to the pressure of the reactor and communicated with the reactor to allow equal portions of catalyst to slowly settle into each section of the lock hopper. Rapidly flowing liquid is then passed into the reactor to prevent catalyst from passing from the reactor while the lock hopper is emptied. The transfer method is used on reactors processing a heavy residual oil and the lock hoppers are pressurized with a lighter oil. Advantages include gentle catalyst transfer, ease of lock hopper pressurization and partial washing of the withdrawn catalyst.</p> |
