Process for the one-step hydrotreatment and hydroisomerization of plant oils using at least one sulfide catalyst with an isomerizing zeolite

A process for treating a feedstock derived from a renewable source, comprising at least the following steps:

• a) a step of hydrotreating said feedstock in the presence of at least one fixed-bed catalyst, said hydrotreating catalyst comprising a hydrogenating function and an oxide support, at a temperature of between 200 and 450° C., at a pressure of between 1 MPa and 10 MPa, at an hourly space velocity of between 0.1 h−1 and 10 h−1 and in the presence of a total amount of hydrogen mixed with the feedstock such that the hydrogen/feedstock ratio is between 70 and 1700 Nm3 of hydrogen/m3 of feedstock,
• b) a step of hydroisomerization of the entire hydrocarbon-based liquid effluent resulting from step a) in the presence of a difunctional fixed-bed hydroisomerization catalyst, said catalyst comprising a sulfide phase of at least one metal from group VIII in combination with at least one metal from group VIB of the Periodic Table and a support comprising at least one zeolite chosen from IZM-2, ZSM-12 and ZSM-23 zeolites and at least one binder, said hydroisomerization step being performed at a temperature of between 250° C. and 500° C., at a pressure of between 1 MPa and 10 MPa, at an hourly space velocity of between 0.1 and 10 h−1 and in the presence of a total amount of hydrogen mixed with the feedstock such that the hydrogen/feedstock ratio is between 70 and 1500 Nm3/m3 of feedstock,
• c) a step of fractionation of the effluent resulting from step b) to obtain at least one gas oil fraction.