Integral method for desulphurization of a hydrocarbon...

C - Chemistry – Metallurgy – 10 – G

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C10G 69/12 (2006.01) C10G 29/20 (2006.01)

Patent

CA 2474525

The invention concerns a method for desulphurization a cracking or steam cracking effluent of hydrocarbons more particularly of a gasoline for example for catalytic cracking including elimination of thiophene compounds by alkylation of said compounds, followed by distillation, hydrocracking of said alkyl-thiophene compounds, then hydrodesulphurization of the effluent derived from the hydrocracking zone. Said method comprises, in a preferred embodiment, a prior step which consists in separating into three fractions the cracking or steam cracking effluent and in submitting to the alkylation step only the depleted intermediate fraction of the heavy basic nitrogenous compounds initially present in the effluents to be alkylated.

Procédé de désulfuration d'un effluent de craquage ou de vapocraquage d'hydrocarbures plus particulièrement d'une essence par exemple de craquage catalytique comportant l'élimination des composés thiophéniques par alkylation de ces composés, suivie d'une distillation, d'un hydrocraquage desdits composés alkyl-thiophéniques, puis d'une hydrodésulfuration de l'effluent issu de la zone d'hydrocraquage. Ce procédé comporte dans une forme préférée de réalisation une étape préalable de séparation en trois fractions de l'effluent de craquage ou de vapocraquage et se propose de n'envoyer à l'étape d'alkylation que la fraction intermédiaire appauvrie des composés azotés basiques lourds présents initialement dans les effluents à alkyker.

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