Gas oil hydroprocess

A process for hydroprocessing a gas oil, comprising:

• (a) contacting a gas oil with hydrogen and optional first diluent to form a first liquid feed wherein hydrogen is dissolved in the first liquid feed;
• (b) contacting the first liquid feed with a first catalyst in a liquid-full hydrotreating reaction zone to produce a first effluent;
• (c) optionally recycling a portion of the first effluent for use as all or part of the first diluent in step (a);
• (d) in a separation zone, separating dissolved gases from the portion of the first effluent not recycled in step (c) to produce a separated product;
• (e) contacting the separated product with hydrogen and optional second diluent to form a second liquid feed, wherein hydrogen is dissolved in the second liquid feed;
• (f) contacting the second liquid feed with a second catalyst in a liquid-full hydrocracking reaction zone to produce a second effluent;
• (g) optionally recycling a portion of the second effluent for use as all or part of the second diluent in step (e);
• and
• (h) in a refining zone upstream of or downstream from the hydrocracking reaction zone, separating one or more refined products and a heavy oil fraction from (1) the portion of the first effluent not recycled, when the refining zone is upstream of the hydrocracking reaction zone, or (2) the portion of the second effluent not recycled when the refining zone is downstream from the hydrocracking reaction zone;
• wherein the first catalyst is a hydrotreating catalyst and the second catalyst is a hydrocracking catalyst.