Patent ID: 6191332
Filing Date: 2001-02-20
Classification: B01J,C07C,Y02P,Y10S

Abstract:
A method of producing olefinic hydrocarbons from a charge comprising aliphatic hydrocarbons with 2 to 6 carbon atoms, by dehydrogenation in at least one reaction chamber, the chamber having a plurality of substantially parallel reaction tubes arranged in rows, each tube containing a fixed bed of catalyst, wherein said method comprises:a) reacting said charge by circulating said charge, optionally preheated, in the tubes containing the fixed beds of catalyst under dehydrogenation conditions at 500-800.degree. C. and collecting an effluent rich in olefinic hydrocarbons;b) purging the tubes with at least one inert gas, after reaction phase a), and collecting a purge effluent;c) regenerating the catalyst in the tubes of said at least one reaction chamber under regenerating conditions, to remove coke deposited on said catalyst during reaction phase a), and recovering a regeneration effluent; andd) purging the tubes with at least one inert gas, after regeneration phase c);wherein the tubes are heated during reaction phase a) by a plurality of radiant ceramic fiber matrix burners arranged at the periphery of the tubes in layers which are substantially parallel, independent of one another, and substantially perpendicular to the tubes,whereby said burners heat a first part of the tubes, representing 1% to 40% of the length of the tubes, with a heat flow equal to 120% to 300% of the mean heat flow of the reaction chamber, and heat the remaining part of the tubes with a heat flow equal to 20% to 85% of the mean heat flow, so that a constant temperature of the catalyst is substantially maintained, andwherein any combustion fumes emanating from said burners is eventually discharged from the chamber.