Process for direct hydrogen injection in liquid full hydroprocessing reactors

摘要

A process of hydroprocessing a hydrocarbon in a down flow reactor comprising one or more hydroprocessing-catalyst beds. The hydrocarbon feed is mixed with hydrogen and optionally diluent to form a liquid feed mixture wherein hydrogen is dissolved in the mixture, and the liquid feed mixture is introduced into the down flow reactor under hydroprocessing conditions. The hydroprocessing-catalyst bed(s) are liquid-full and the feed reacts by contact with the catalyst. Hydrogen gas is injected into at least one of the hydroprocessing-catalyst beds such that at least part of the hydrogen consumed in that bed is replenished and the liquid-full condition is maintained. In a multi-bed reactor, hydrogen gas may be injected into more than one or all of the hydroprocessing-catalyst beds.

主权项

1. A hydroprocessing process comprising:
(a) providing a down flow reactor comprising one or more hydroprocessing-catalyst beds and providing when two or more hydroprocessing-catalyst beds are present that said beds are disposed in sequence and in liquid communication; (b) contacting a hydrocarbon feed with hydrogen and optionally diluent to form a liquid feed mixture wherein hydrogen is dissolved in the mixture; (c) introducing said liquid feed mixture into the down flow reactor under hydroprocessing conditions; (d) reacting the liquid feed mixture by contact with the one or more hydroprocessing-catalyst beds, wherein each of said one or more hydroprocessing-catalyst beds is substantially liquid-full; (e) injecting hydrogen gas directly into at least one of the one or more hydroprocessing-catalyst beds at a controlled rate such that at least part of the hydrogen consumed in each bed by the hydroprocessing reaction is replenished and the substantially liquid-full condition in each hydroprocessing-catalyst bed is maintained; and (f) adjusting the controlled rate of hydrogen gas directly injected into at least one of the one or more hydroprocessing-catalyst beds based on the amount of hydrogen gas determined to be in a headspace above said at least one of the one or more hydroprocessing-catalyst beds.