Process for introducing biogenic carbon into fossil kerosene fuel by hydrotreating in co-treatment using at least one hydroisomerizing catalyst

Abstract

The present invention describes a process for producing at least one kerosene fraction by co-treating a feedstock from a renewable source selected from vegetable or animal oils and fats, or mixtures of such feedstocks, containing triglycerides and / or free fatty acids and / or esters mixed with a fossil feedstock comprising at least one hydroisomerization step of said feedstock in the presence of a bifunctional 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 selected from IZM-2 zeolites and MTW structural-type zeolites, alone or in mixtures, and at least one binder, said hydroisomerization step being carried out at a temperature between 200°C and 400°C, at a pressure between 1 MPa and 10 MPa,at an hourly spatial velocity between 0.1 and 10 h-1 and in the presence of a total quantity of hydrogen mixed with the feed such that the hydrogen / feed ratio is between 30 and 1500 Nm3 / m3 of feed, then a separation step of the hydroisomerized effluent to obtain at least one kerosene cut.