Process and reactor for the production of olefins by the...

C - Chemistry – Metallurgy – 10 – G

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C10G 11/00 (2006.01) C10G 9/14 (2006.01) C10G 11/10 (2006.01)

Patent

CA 2510878

A process for the production of light olefins by means of the steam cracking reaction of liquid hydrocarbon feeds, preferably selected from naphtha, kerosene, atmospheric gas oil, vacuum gas oil and oil residues, alone or mixed with each other, in the presence of a suitable catalyst, effected at a reaction temperature ranging from 700 to 850 ~C, at a pressure ranging from 1.1 to 4.5 absolute Atm and for a contact time ranging from 0.02 to 0.3 sec, preferably from 0.05 to 0.15 sec, in a reactor comprising one or more cylindrical pipes, with the same or different section, consisting of a tubular core and a reaction zone whose transversal section is in the form of a circular crown, the ratio between the area of said circular crown and the circular section ranging from 0.35 to 0.99, preferably from 0.75 to 0.95.

L'invention concerne un procédé de production d'oléfines légères par réaction de vapocraquage de charges d'hydrocarbures liquides, de préférence sélectionnés parmi naphtha, kérosène, gazole atmosphérique, gazole sous vide et résidus d'hydrocarbures, seuls ou en combinaison, en présence d'un catalyseur approprié, à une température de réaction comprise entre 700 et 850 ·C, à une pression comprise entre 1,1 et 4,5 atm absolues et pendant un temps de mise en contact compris entre 0,02 et 0,3 s; de préférence entre 0,05 et 0,15 s; dans un réacteur comprenant un ou plusieurs tuyaux cylindriques, de section identique ou différente, constitués d'une partie centrale tubulaire et d'une zone de réaction dont la section transversale se présente sous forme de couronne circulaire, le rapport entre la surface de cette couronne circulaire et la section circulaire étant compris entre 0,35 et 0,99; de préférence entre 0,75 et 0,95.

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