Membrane process for increasing conversion of catalytic cracking or thermal cracking units (LAW011)
AssigneeExxon Research & Engineering Co.
InventorsJames R. Sweet, Tan-Jen Chen, Charles P. Darnell
Life of this patent
Estimating the term…
Abstract
The yield and quality of products secured from cracking units is increased by the process of subjecting the product stream secured from such cracking unit to a selective aromatics removal process and recycling the recovered aromatics lean (saturates rich) stream to the cracking unit whereby such saturates rich stream is subjected to increased conversion to higher value desired products.
Claims6
A method for producing gasoline and light olefins from a liquid hydrocarbonaceous feed stream boiling in the range 65.degree. F. (18.3.degree. C.) to above 1050.degree. F. (565.5.degree. C.) which comprises subjecting the liquid hydrocarbonaceous feed to a non-hydrogen consuming process step selected from thermal or catalytic cracking, recovering the 65.degree. to 800.degree. F. (18.3.degree. to 426.7.degree. C.) effluent from said non-hydrogen consuming process step, passing said effluent or a fraction thereof to a membrane aromatic separation zone containing a polyester imide membrane therein producing an aromatics and nitrogen rich fraction and a non-aromatics rich fraction, passing the non-aromatics rich fraction back to the non-hydrogen consuming process step wherein the non-aromatic rich fraction stream is combined with liquid hydrocarbonaceous feed stream and is therein converted to light products resulting in increased yield of gasoline and light olefins.
A method for producing gasoline and light olefins from a liquid hydrocarbonaceous feed stream boiling in the range 65.degree. F. (18.3.degree. C.) to above 1050.degree. F. (565.5.degree. C.) which comprises subjecting the liquid hydrocarbonaceous feed to a non-hydrogen consuming process step selected from fluid flexicoking or delayed coking, recovering the 65.degree. to 800.degree. F. (18.3.degree. to 426.7.degree. C.) effluent from said non-hydrogen consuming process step, passing said effluent or a fraction thereof to a membrane aromatic separation zone containing a polyester imide membrane therein producing an aromatics and nitrogen rich fraction and a non-aromatics rich fraction, passing the non-aromatics rich fraction back to the non-hydrogen consuming process step wherein the non-aromatic rich fraction stream is combined with liquid hydrocarbonaceous feed stream and is therein converted to light products resulting in increased yield of gasoline and light olefins.
Dependencies are inferred from the claim text.