Cracking of hydrocarbons to gaseous olefines

Claim 1

A PROCESS FOR CRACKING HYDROCARBONS WHICH CONTAIN HIGH BOILING CONSTITUENTS TO PRODUCE GASEOUS OLEFINES WHICH COMPRISES: INJECTING SAID HYDROCARBONS INTO A REACTOR CONTAINING FLUIDIZED SOLID PARTICLES, SAID REACTOR BEING MAINTAINED AT A TEMPERATURE OF FROM ABOUT 680* TO ABOUT 850*C., SAID FLUIDIZED SOLID LPARTICLES BEING INERT HEAT CARRIERS HAVING A GRAIN SIZE OF BETWEEN ABOUT 0.05 AND ABOUT 4.0 MM., WHEREIN AT LEAST 10% BY WEIGHT OF SAID PARTICLES HAVE A GRAIN SIZE GREATER THAN ABOUT 1 MM., SAID PARTICLES BEING CIRCULATED BETWEEN SAID REACTOR AND A FLUIDIZED LAYER REGENERATOR WHEREIN SAID PARTICLES ARE REHEATED, THE PARTICLES BEING WITHDRAWN FROM THE REACTOR AND REGENERATOR THROUGH DOWN PIPES IN WHICH THEY MOVE AS A COMPACT MASS, SAID PARTICLES BEING RETURNED TO SAID REACTOR AND SAID REGENERATOR THROUGH RISING PIPES IN THE FORM OF A DILUTE SUSPENSION WHICH IS FORMED BY THE INTRODUCTION OF THE GAS INTO THE COMPACT MASS; PASSING THE CRACKED GAS AND VAPOR LEAVING THE FLUIDIZED REACTOR INTO A CYCLONE WHEREIN THE BULK OF THE ENTRAINED SOLID PARTICLES ARE SEPARATED FROM SAID GAS AND SAID VAPOR, FROM 5 TO 50 GRAMS OF SOLID PER NORMAL CUBIC METER OF CRACKED GAS BEING LEFT IN THE CRACKED GAS LEAVING SAID CYCLONE; PASSING THE GAS AND VAPOR TO A QUENCHING ZONE WHEREIN SAID