摘要:
Addition of a readily fluidizable, 100-400 micron average diameter particular CO combustion promoter to a circulating fluid bed (CFB) combustion unit improves the efficiency of CO burning, reduces emissions of CO and improves the efficiency of the unit.
摘要:
A method is disclosed for increasing heat transfer efficiency between a conduit and a gas flowing through the conduit by fluidizing in the gas stream a Geldart Type A powder having controlled fines content. The invention further provides a method for integrating two fluid beds to transfer heat from a heat source to a fluid-bed reaction zone.
摘要:
An improvement in gasoline octane without substantial decrease in overall yield is obtained in an integrated process combining a fluidized catalytic cracking reaction and a fluidized catalyst olefin oligomerization reaction when crystalline medium pore shape selective zeolite catalyst particles are withdrawn in partially deactivated form from the oligomerization reaction stage and added as part of the active catalyst in the FCC reaction.
摘要:
A method and apparatus for removing sulfur from a hydrocarbon-containing fluid stream wherein desulfurization is enhanced by improving the contacting of the hydrocarbon-containing fluid stream and sulfur-sorbing solid particulates in a fluidized bed reactor.
摘要:
A process and apparatus for controlling the flow of FCC catalyst around a catalyst regenerator, using a non-mechanical valve, is disclosed. The preferred non-mechanical valve provides a de-aeration section, addition of fluidizing gas, a "U" trap seal, and venturi gas outlet on the top of the trap, for reliable flow control of non-uniform settling particles such as FCC catalyst. Control of the flow of a fluidizing gas to such a valve changes the flow properties of the FCC catalyst and permits flow control without resort to plug valves, or other internal mechanical valves, which are difficult to use in the harsh environment experienced within FCC regenerators.
摘要:
A method is disclosed for increasing heat transfer efficiency between a conduit and a gas flowing through the conduit by fluidizing in the gas stream a Geldart Type A powder having controlled fines content. The invention further provides a method for integrating two fluid beds to transfer heat from a heat source to a fluid-bed reaction zone.
摘要:
A known method for passivating contaminant metals on an FCC catalyst comprises treating the catalyst with a sufficient amount of a sulfur-containing compound capable of associating with the contaminant metals when in contact therewith. An improvement comprises contacting the catalyst with the sulfur-containing compound for at least 3 seconds. In another embodiment of the invention, the improvement comprises contacting the catalyst with the sulfur-containing compound in a separate treatment vessel.
摘要:
Addition of a CO combustion promoter to a circulating fluid bed (CFB) combustion unit and reduction of the air addition rate to 100-110% of stoichiometric improves the efficiency of CO burning, reduces emissions of CO and improves the efficiency of the unit. Stable, reduced temperature operation with air rates close to stoichiometric, reduces NO.sub.x emissions. A circulating (100-400 micron particles) or fast settling (400-1200 micron particle) CO combustion promoter may be used.
摘要:
Addition of a readily fluidizable, but fast settling, 400-1200 micron average diameter particulate CO combustion promoter to a circulating fluid bed (CFB) combustion unit improves the efficiency of CO burning, reduces emissions of CO and improves the efficiency of the unit. The CO combustion promoter accumulates in, or just above, in the fast fluidized bed combustion zone of the CFB.
摘要:
A fluidized bed catalytic process for conversion of propene-rich light olefinic gas feedstock comprising at least 2 mol % ethene and having a C.sub.3 :C.sub.2 molar ratio of at least about 2:1 to produce hydrocarbons rich in C.sub.4.sup.+ aliphatics and aromatics, comprising maintaining a turbulent fluidized bed in a reactor operating at a moderate pressure in the range from about 400 to 2500 kPa, and temperature of about 315.degree. to 510.degree. C., the catalyst having an apparent particle density of about 0.9 to 1.6 g/cm.sup.3, a size range of about 1 to 150 microns, and average catalyst particle size of about 20 to 100 microns containing about 10 to 25 weight percent of fine particles having a particle size less than 32 microns, by passing hot feedstock vapor upwardly through the fluidized catalyst bed at a superficial fluid velocity of about 0.3 to 2 meters per second. Hydrocarbon product is recovered containing a major amount of C.sub.5.sup.+ hydrocarbons and containing C.sub.3 -C.sub.5 alkanes and alkenes in the ratio of about 0.1:1 to 200:1 and preferably at a reaction severity index (R.I.) of about 0.2:1 to 5:1.