TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Process: The step (A) of contacting of the heavy hydrocarbon feedstock with a hydrocarbon cracking catalyst involves contacting the heavy hydrocarbon feedstock with a blended catalyst comprising regenerated catalyst and coked catalyst in a fluidized reactor zone at hydrocarbon cracking reaction conditions to produce a fluid catalytic cracker effluent stream containing hydrocarbon products including light olefins, where the catalyst has a catalyst composition including a first component comprising a large pore molecular sieve and a second component comprising a zeolite with not greater than medium pore size ( greater than or equal to 1 wt.%) of the catalyst composition. The step (E) of contacting at least a portion of the first separation system stream in an absorption system involves contacting at least a portion of the first separation system stream in a primary absorption unit with a primary absorption solvent at conditions to absorb a significant portion of greater than or equal to 2C hydrocarbons to form a first primary absorption unit stream comprising primarily methane and hydrogen and to form a second primary absorption unit stream comprising at least a portion of the primary absorption solvent, greater than or equal to 2C hydrocarbons, a quantity of light olefins and a reduced quantity of hydrogen and methane; contacting at least a portion of the first primary absorption unit stream in a secondary absorption unit with a secondary absorption solvent comprising a liquid portion of the first separation system stream at conditions to absorb light olefins to form a first secondary absorption unit stream comprising primarily methane and hydrogen and a second secondary absorption unit stream comprising a quantity of greater than or equal to 2C hydrocarbons including light olefins; stripping at least a quantity of methane and hydrogen from at least a portion of the second primary absorption unit stream in a stripper unit at conditions to form a first stripper unit stream comprising a quantity of hydrogen and methane and a second stripper unit stream comprising at least a portion of the primary absorption solvent and greater than or equal to 2C hydrocarbons including light olefins; returning at least a portion of the first stripper unit stream to the primary absorption unit; separating at least a portion of the second stripper unit stream to form at least a first process stream comprising at least a portion of the primary absorption solvent and at least one second process stream comprising a remaining portion of the second absorption system stream; and returning at least a portion of the first process stream to the absorption system as the primary absorption solvent. The process further involves stripping a liquid portion of the first separation system stream in the stripping unit. The second stripper unit stream includes a quantity of at least one impurity selected from hydrogen sulfide, mercaptan, sulfur, water, carbon dioxide, and acetylene, and the process further involves treating at least a portion of the second absorption system stream in a treatment system to remove at least a portion of the impurity. The step of separating at least a portion of the second stripper unit stream involves forming a second separated process stream comprising primarily 3C hydrocarbons and the process further comprises separating at least a portion of the second separated process stream in a 3C separation unit to form a first 3C separation unit stream comprising primarily propylene and a second 3C separation unit stream comprising primarily propane. The second absorption system stream of step (E) includes a quantity of at least one impurity selected from hydrogen sulfide, mercaptan, sulfur, water, carbon dioxide, and acetylene, and the process further involves treating at least a portion of the second absorption system stream in a treatment system to remove at least a portion of the impurity. The step (F) of separating at least a portion of the second absorption system stream involves forming a first separated process stream comprising primarily 2C hydrocarbons, and the process further involves separating at least a portion of the first separated process stream in a 2C separation unit to form a first 2C separation unit stream comprising primarily ethylene and a second 2C separation unit stream comprising primarily ethane; forming a second separated process stream comprising primarily 3C hydrocarbons and the process further involves separating at least a portion of the second separated process stream in a 3C separation unit to form a first 3C separation unit stream comprising primarily propylene and a second 3C separation unit stream comprising primarily propane; and forming a third separated process stream comprising primarily gasoline. The process involves: (a1) contacting a heavy hydrocarbon feedstock with a hydrocarbon cracking catalyst in a fluidized reactor zone at hydrocarbon cracking reaction conditions to produce light olefins to form a fluid catalytic cracker effluent stream comprising a range of hydrocarbons as cracked stream containing hydrocarbon products including light olefins, where the hydrocarbon cracking catalyst has a catalyst composition including a first component comprising a large pore molecular sieve and a second component comprising a zeolite with not greater than medium pore size ( greater than or equal to 1 wt.%) of the catalyst composition; (b1) separating the fluid catalytic cracker effluent stream in a separation system to form a first separation system stream comprising primarily less than or equal to 4C hydrocarbons and at least a second separation system stream comprising primarily greater than or equal to 5C hydrocarbons; (c1) contacting at least a portion of the first separation system stream in an absorption system with an absorption solvent at conditions to absorb a significant portion of greater than or equal to 2C hydrocarbons from the first separation system stream to form a first absorption system stream comprising primarily methane and hydrogen, and to form a second absorption system stream comprising at least a portion of the absorption solvent, greater than or equal to 2C hydrocarbons and a quantity of at least one impurity selected hydrogen sulfide, mercaptan, sulfur, water, carbon dioxide, and acetylene; (d1) treating at least a portion of the second absorption system stream in a treatment system to remove at least a portion of the impurity; (e1) separating at least a portion of the treated second absorption system stream to form a first process stream comprising at least a portion of the absorption solvent, a first separated process stream comprising primarily 2C hydrocarbons, a second separated process stream comprising primarily 3C hydrocarbons, and a residual separated process stream comprising a remaining portion of the second absorption system stream; (f1) returning at least a portion of the first process stream to the absorption system as the absorption solvent; (g1) separating the first separated process stream in a 2C separation unit to form a first 2C separation unit stream comprising primarily ethylene and a second 2C separation unit stream comprising primarily ethane; and (h1) separating the second separated process stream in a 3C separation unit to form a first 3C separation unit stream comprising primarily propylene and a second 3C separation unit stream comprising primarily propane. The conditions to absorb a significant portion of greater than or equal to 2C hydrocarbons in the absorption system comprise greater than or equal to 1379 kPag (200 psig) and 4-27 degrees C (40-80 degrees F). Prior to the step (c1) of contacting at least a portion of first separation system stream in an absorption system, the process further involves cooling at least a portion of the first separation system stream to 4-27 degrees C (40-80 degrees F); and compressing at least a portion of the first separation system stream to greater than or equal to 1379 kPag (200 psig). Preferred Components: The absorption solvent comprises primarily 4C hydrocarbons. EXAMPLE - No suitable example given.