Abstract: The invention is directed to a process to prepare propylene from a mixture of hydrocarbons having an olefin content of between 5 and 50 wt. % and boiling for more than 90 vol. % between 35 and 280 ?C or from a hydrocarbon feed comprising paraffins, naphthenics and/or aromatics and optionally up to 10 wt. % of olefins, by first contacting the feed with a low acidic density cracking catalyst in a reactor, separating propylene and subsequently contacting the residue with a high acidic density cracking catalyst in a reactor at a more elevated temperature, separating propylene and recycling the residue to first and second cracking reactors. Aromatics may be added to first and second cracking step to improve cycle length.

Abstract: The invention is directed to a process to prepare propylene from a mixture of hydrocarbons having an olefin content of between 5 and 50 wt. % and boiling for more than 90 vol. % between 35 and 280° C. or from a hydrocarbon feed comprising paraffins, naphthenics, aromatics and optionally up to 10 wt. % of olefins, by first contacting the feed with a low acidic density cracking catalyst in a fixed bed reactor, separating propylene and subsequently contacting the residue with a high acidic density cracking catalyst in a fixed bed reactor at a more elevated temperature, separating propylene and recycling the residue to first and second cracking reactors. Aromatics may be added to first and second cracking step to improve cycle length.

Abstract: The invention is directed to a process to prepare propylene from a mixture of hydrocarbons having an olefin content of between 5 and 50 wt. % and boiling for more than 90 vol. % between 35 and 280° C. or from a hydrocarbon feed comprising paraffins, naphthenics, aromatics and optionally up to 10 wt. % of olefins, by first contacting the feed with a low acidic density cracking catalyst in a fixed bed reactor, separating propylene and subsequently contacting the residue with a high acidic density cracking catalyst in a fixed bed reactor at a more elevated temperature, separating propylene and recycling the residue to first and second cracking reactors. Aromatics may be added to first and second cracking step to improve cycle length.

Abstract: A process for reactivating an iron-contaminated FCC catalyst is disclosed. The process comprises contacting the iron-contaminated FCC catalyst with an iron transfer agent. The iron transfer agent comprises a magnesia-alumina hydrotalcite material that contains a modifier selected from the group consisting of calcium, manganese, lanthanum, iron, zinc, or phosphate.

Abstract: Novel catalytic compositions for cracking of crude oil fractions are disclosed. The catalytic compositions comprise a basic material. When used in a cracking process, preferably a FCC process, the resulting LCO and HCO fractions have desirably low aromatics levels. Further disclosed is a one-stage FCC process using the catalytic composition of the invention. Also disclosed is a two-stage FCC process for maximizing the LCO yield.

Abstract: A particulate unsupported superacid catalyst for use in fluid catalytic cracking is provided comprising doped silica which has been doped with from about 1 to about 99 wt %, based on the weight of the catalyst composition, of at least one inorganic oxide dopant selected from the group consisting of rare earth metal oxides, alkaline earth metal oxides, zinc oxide, magnesium oxide, manganese oxide, yttrium oxide, niobium oxide, zirconium oxide and titanium oxide, and wherein the doped silica has been anion-modified by an anion selected from the group consisting of phosphate, tungstate, and sulphate.

Abstract: Novel catalytic compositions for cracking of crude oil fractions are disclosed. The catalytic compositions comprise a basic material. When used in a cracking process, preferably a FCC process, the resulting LCO and HCO fractions have desirably low aromatics levels. Further disclosed is a one-stage FCC process using the catalytic composition of the invention. Also disclosed is a two-stage FCC process for maximizing the LCO yield.

Abstract: A process is disclosed for the preparation of an additive-containing anionic clay generally comprising the steps of: a) milling a physical mixture of a divalent metal compound and a trivalent metal compound, b) calcining the milled physical mixture at a temperature in the range of about 200 to about 8000 C, and c) rehydrating the calcined mixture in aqueous suspension to form the additive-containing anionic clay, wherein an additive is optionally present in the physical mixture of step (a) and present in the aqueous suspension of step (c), and the additive is essentially free of vanadium.

Abstract: Processes for maximizing low aromatics LCO yield and/or propylene yield in fluid catalytic cracking are disclosed. The processes employ catalytic compositions that comprise a predominantly basic material and little to no large pore zeolite.

Abstract: Processes for maximizing low aromatics LCO yield and/or propylene yield in fluid catalytic cracking are disclosed. The processes employ catalytic compositions that comprise a predominantly basic material and little to no large pore zeolite.

Abstract: Novel catalytic compositions for cracking of crude oil fractions are disclosed. The catalytic compositions comprise a basic material and at least one intermediate and/or small pore zeolite, and comprises little to no large pore zeolite.