Process for producing diesel fuel from a biorenewable feed with recycled sulfur

A process for hydrotreating a biorenewable feedstock, the process comprising:

• injecting sulfur to a feed stream comprising a biorenewable feedstock and passing the feed stream comprising the biorenewable feedstock with injected sulfur to a hydrotreating reactor section;
• hydrotreating said feed stream comprising said biorenewable feedstock in said hydrotreating reactor section in presence of a hydrotreating hydrogen stream comprising at least 50 wppm hydrogen sulfide and a hydrotreating catalyst to hydrodeoxygenate said feed stream to provide a hydrotreated stream;
• separating said hydrotreated stream into a hydrotreated liquid stream and a hydrotreated gas stream comprising hydrogen, carbon dioxide and hydrogen sulfide;
• purifying a first portion of said hydrotreated gas stream to provide a contacted purified gas stream;
• and
• mixing said contacted purified gas stream with a second portion of said hydrotreating gas stream to provide said hydrotreating hydrogen stream.

A process for hydrotreating a biorenewable feedstock, the process comprising:

• injecting sulfur to a feed stream comprising a biorenewable feedstock and passing the feed stream comprising the biorenewable feedstock with injected sulfur to a hydrotreating reactor section;
• hydrotreating said feed stream comprising said biorenewable feedstock in said hydrotreating reactor section in presence of a hydrotreating hydrogen stream and a hydrotreating catalyst to hydrodeoxygenate said feed stream to provide a hydrotreated stream;
• separating said hydrotreated stream into a hydrotreated liquid stream and a hydrotreated gas stream comprising hydrogen, carbon dioxide and hydrogen sulfide;
• splitting said hydrotreated gas stream into a recycle gas stream and a purge gas stream;
• contacting said purge gas with a solid media to remove impurities and provide a contacted gas stream, wherein the solid media is a permeable membrane;
• and
• recycling said contacted gas stream and said recycle gas stream to said hydrotreating step as components of said hydrotreating hydrogen stream, wherein said hydrotreating hydrogen stream further comprises at least 50 wppm hydrogen sulfide.