Process and apparatus for integration of a high-pressure hydroconversion process and a medium-pressure middle distillate hydrotreatment process, whereby the two processes are independent

A process for hydrotreatment of a light/middle distillate having a boiling point for 95% by weight of the feedstock of 0-400° C., said process comprising:

• hydrotreating said light/middle distillate feedstock in a light/middle distillate hydrotreatment unit operating under a hydrogen partial pressure of 0.5-6.0 MPa, to which hydrogen is supplied, wherein the hydrogen supplied to the a light/middle distillate hydrotreatment unit is at least partially a hydrogen-rich gas obtained from the separation of gases from an effluent from a hydrotreatment and/or hydroconversion unit, the latter unit being independent from said hydrotreatment unit, wherein said hydrogen-rich gas obtained from separation of gases from said effluent from said hydrotreatment and/or hydroconversion unit is introduced into said hydrotreatment unit without prior compression and without prior treatment, and
• wherein said separation of gases is conducted at 2-8 MPa, and the hydrotreatment and/or hydroconversion is conducted in said hydrotreatment and/or hydroconversion unit on a feedstock having a higher boiling point than said light/middle distillate and is carried out at a hydrogen partial pressure that is at least 4.0 MPa higher than the operating hydrogen partial pressure of the light/middle distillate hydrotreatment unit.