Design operating conditions for gasoline and naphtha hydrogenation
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When reviewing the design specifications for gasoline and naphtha, the pre-hydrogenation section is noted; generally, for gasoline hydrogenation, the hydrogen-to-oil ratio in the design is around 3-5, the space velocity is around 3.0, and the reaction pressure is 2.0 MPa； However, I have seen designs for naphtha hydrogenation where the hydrogen-to-oil ratio is around 300, the space velocity is around 11, and the reaction pressure is 4.0 MPa. What are the mechanisms behind these design differences, and what causes them? Is it due to different uses of the product?
Generally, in gasoline hydrogenation, pre-hydrogenation involves the saturation of dienes along with sulfur transfer; is it necessary to saturate dienes in naphtha as well? ? Are you referring to the parameters for the naphtha desulfurization process?
Naphtha needs to have its olefins and dienes removed, so a higher hydrogen-to-oil ratio is used.
The sulfur transfer hydrogen-to-oil ratio is low, at 5-8, and the temperature rise is also small. However, olefin saturation occurs during desulfurization, which requires more hydrogen
There are two reaction stages: the first one involves low temperature and a low oil-to-hydrogen ratio, which is presumably the volume ratio of liquid to gas; the second reaction stage involves a gas volume ratio, and it is not limited to dienes only – desulfurization and other processes are also involved.