A reactor vessel catalytic fluid cracking comprising: a) an elevator lower internal reactor tube, wherein a portion of the riser lower internal reactor is located within the reactor vessel catalytic cracking fluid bed, and wherein the lower end of the riser lower internal reactor is connected to the container casing reactor fluid bed catalytic cracking; b) an upper internal riser reactor vessel located within the reactor fluid bed catalytic cracking, in which the lower end of the riser reactor top inner ends in a conical section connected to a cylindrical sleeve; wherein the upper section of the riser upper internal reactor is not in fluid connection with section dilute phase of the reactor vessel, and at least two outlet ports riser are mechanically connected to the upper section of the riser upper internal reactor; wherein the upper end of the riser inner lower reactor is in fluid connection with the riser and upper internal reactor dilute phase section of the reactor vessel; the lower internal reactor riser tube is not mechanically connected to the riser top internal reactor; the largest diameter of the conical section of the riser reactor top internal diameter is greater than the upper end of riser lower internal reactor; the cylindrical sleeve of the upper internal riser reactor is greater than the diameter of the upper end of the riser reactor lower internal diameter; at least a portion of the cylindrical sleeve of the upper internal riser reactor overlaps with at least a portion of the upper end of the riser lower internal reactor; and there is no mechanical means located in the region of the overlapping portion of the cylindrical sleeve of the riser upper internal reactor and the upper end of the riser lower internal reactor to restrict the eccentricity between the cylindrical sleeve and the upper end of the riser lower internal reactor; wherein the length of the overlapping portion of the cylindrical sleeve of the upper internal riser reactor and the upper end of the riser reactor is lower inner 6 to 36 inches (15.24 to 91.44 cm) when the container catalytic cracking reactor fluid bed is in the operating condition (hot); and wherein the acute angle between the conical section of the riser reactor and upper inner shaft riser upper internal reactor is 5 ° to 25 °; and in which a transition length measured from the top of the riser reactor inner bottom to the bottom of the conical section is from 6 to 36 inches (15.24 to 91.44 cm) when the reactor vessel catalytic cracking fluid bed is in the operating condition (hot); and wherein there is an annular gap between the riser reactor and lower inner cylindrical sleeve of the upper internal riser reactor 1 to 4 inches (2.54 to 10.16 cm).
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