Steam-cracking in a fluid bed reaction zone

摘要

The invention is directed to steam-cracking in a fluid bed reaction zone, of a charge of hydrocarbons having at least two carbon atoms per molecule. In this process the charge (3) circulates with steam (2) and inert solid particles, heated at a temperature T1 from 500 DEG to 1,800 DEG C., through at least one enclosure (7). A gas effluent is separated from the particles in the enclosure and fed to a quenching zone (8) opening into said enclosure. Said effluent is circulated with cooling second solid particles which are at a temperature T2 lower than T1 and at most equal to 800 DEG C. A steam-cracking effluent is then recovered through line (15). This process can be used in petrochemistry, particularly for producing ethylene and propylene.