Abstract: A process is disclosed for controlling movement of a vertically movable plug valve with respect to a bottom open end of a riser conduit of a catalytic conversion apparatus during startup and shutdown. The method involves sensing the pressure between the communicating surfaces of the plug valve and the riser conduit as the riser conduit expands or contracts due to thermal changes experienced during startup and shutdown. When the riser conduit expands and causes the pressure to exceed a preselected range, the position of the plug valve with respect to the riser conduit is lowered to reduce the pressure to within the range. When the riser conduit contracts and causes the pressure to fall below the preselected range, the position of the plug valve with respect to the riser conduit is raised to prevent catalyst flow through the valve.

Abstract: An improved process for hydrocarbon conversion-catalyst regeneration processes particularly useful for residual oil, especially high carbon content residual oil conversion. The process generally comprises cooling the compressed air which is introduced into the second stage catalyst regeneration vessel in order to allow processing of feeds which typically produce high coke loading of catalyst in the conversion zone. The cooling process described can be installed and maintained with minimal expense in existing facilities and generally comprises a refrigeration unit and a heat exchange means installed in the conduit transporting air from a compressor unit to the second stage catalyst regenerator air distributor means.

Abstract: A process is described for converting residual oil with fluid catalyst particles which comprises passing an upflowing suspension of fluid catalyst particles at an elevated temperature upwardy through a riser reaction zone/atomizing a residual oil feed to be converted to a particle size commensurate with the particle size of the catalyst particles in the upflowing suspension; discharging the atomized residual oil at a velocity in excess of 300 ft./sec. for contact with said upflowing catalyst particle suspension; maintaining the temperature of contact between said catalyst particles and said atomized residual oil feed suspension sufficiently elevated to obtain up to 50 percent thermal conversion of the atomized oil feed and catalytic conversion thereof by an order of magnitude greater than obtainable with a less atomized oil feed; and separating the suspension vaporous products of the previous step from catalyst particles in a time frame less than two seconds.

Abstract: A process for the clean-up of particulate containing gases is provided wherein a difference in pressures between the pressure of particulate-containing gases in the inlet to cyclone separation means and the pressure in an underflow exit is maintained and controlled. In a preferred embodiment, the particulate-containing gases comprise flue gas from a catalyst regeneration process comprising two separate regeneration zones comprising a low temperature regeneration zone followed by a higher temperature regeneration zone. A CO rich flue gas is recovered from the low temperature regeneration zone and a CO.sub.2 rich flue gas is recovered from the higher temperature regeneration zone. The high temperature CO.sub.2 rich flue gas is passed through a heat exchanger to produce steam and cool the CO.sub.2 rich flue gas. The cooled CO.sub.2 rich flue gas is passed through cyclone separators to capture catalyst particles.

Abstract: A process for converting residual oil comprising vacuum bottoms in the presence of a cracking catalyst of high surface area and comprising an ultrastable zeolite is described. More particularly, a conversion process particularly contributing to producing cycle oil and gasoline boiling range products with reduced carbon deposition in combination with a relatively high regeneration temperature operation of at least 1350.degree. F. and above, and a short contact time riser hydrocarbon conversion operation contributing to reducing slurry oil product in favor of lower boiling products is described. A fluid cracking catalyst comprising a special ultrastable crystalline zeolite of high silica to alumina ratio provides hydrothermal stability of acceptable tolerance in the environment employed.