Refinery Dry Gas Hydrofining Process

Refinery Dry Gas Hydrofining Process

Normally, for refinery dry gas feedstock with olefin content ≤7v%, the reactor in the hydrogenation process is a common hydrogenation reactor (adiabatic reactor), which is a one-stage hydrogenation process.This process is simple,which can be carried out by using a fixed-bed hydrogenation reactor.With the successful development of a new type of hydrogenation catalyst with good low-temperature performance, the process has been used in domestic hydrogen production units.Especially in the modification of old hydrogen production units, it is widely used and has achieved good economic benefits.However, due to the limitation of the olefin content of the mixed gas (≤7v%), the use of coking dry gas or catalytic dry gas is limited, which is not enough to maximize the utilization of cheap coking dry gas or catalytic dry gas.

For refinery dry gas feedstock with olefin content >7v%, the reactors in the hydrogenation process are usually isothermal bed reactors connected in series with adiabatic reactors, which is two-stage hydrogenation process.Among them, the isothermal bed reactor is a tube-and-tube reactor,in the tube of which is loaded hydrogenation catalysts.The water vapor or other media Removing the hydrogenationreactiong heat outside the tube through the water vapor or other media is in order to effectively control the reaction temperature and temperature rise of the catalyst bed.Since the process is not limited by olefin content, coking dry gas or catalytic dry gas can be used alone.Compared with the adiabatic cycle hydrogenation process, this process has the advantages of low investment, low energy consumption, strong adaptability of raw materials, and large operating flexibility.Promoted in the petrochemical industry, it has great industrial application value.

However, whether it is a one-stage hydrogenation process or a two-stage hydrogenation process, the catalyst is required to have good low-temperature activity, which is the lower the activation temperature of the reaction, the better.