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Heavy cycle oil

Heavy cycle oil, heavy naphtha, and other circulating side pumparound reflux streams are used to remove heat from the fractionator. They supply reboil heat to the gas plant and generate steam. The amount of heat removed at any pumparound point is set to distribute vapor and liquid loads evenly throughout the column and to provide the necessary internal reflux. [Pg.24]

The debutanizer separates the feed into two products. The overhead product contains a mixture of C3 s and C4 s. The bottoms product is the stabilized gasoline. Heat for separating these products comes from an external reboiler. The heating source is usually the main fractionator heavy cycle oil or slurry. Steam can also be used. [Pg.28]

Feed - (light cycle oil + heavy cycle oil + decanted oil) Feed... [Pg.142]

Group 3 Loss of pump around flow. This grouping comprises malfunctions associated with the circulation of fluids through and around the main fractionator. The loss of one or more pump flows (slurry, light cycle oil, naphtha, and heavy cycle oil) leads to the loss of some of the fractionator heat sink. [Pg.75]

The performance analysis and product analysis results confirm previous findings (3,8) that hydrotreating improves the quality of catalytic cracker feedstock and the resultant products. In addition, it was shown that the quality of the liquid products and the yields of the coke and the heavy cycle oil (HCO) from cracking of the severely hydrotreated feedstock (WM-2-9) were independent of the conditions of the cracking process. These results imply that there exists a degree of pretreatment hydrotreating above which... [Pg.304]

The catalyst must also have acidity in the matrix in order to reduce the molecular weight of molecules too large to enter the zeolite and in order to also convert heavy-cycle oil to light-cycle oil. Our studies have established that good balance in acidity between the matrix and the zeolite tends to enhance selectivity. A stable matrix acidity is also required, and here a high alumina silica-alumina cogel was selected due to its demonstrated stability in the pre-zeolite era. Certainly many other acidic matrices could probably be substituted. [Pg.338]

Maximizing FCC Light Cycle Oil by Heavy Cycle Oil Recycle... [Pg.1]

In steady-state FCC operation with heavy cycle oil (HCO) recycling, it is conceivable that some hydrocarbon molecules could go through the riser multiple times. We developed a two-pass scheme that combines the Davison circulation riser (DCR) and advanced cracking evaluation (ACE) unit to simulate the recycling operation. [Pg.2]

Modifications can be made to reduce the amount of middle distillate leaving with the bottoms, or to remove the middle distillate in a separate tower. If more middle distillates are a primary objective, a lower conversion may be desired. A separate heavy cycle oil draw may have to be added or reinstated to give the best overall yields. [Pg.95]

Cycle Oil. Heavier, distillate range compounds formed during FCC processing can accumulate within the FCC fractionator. The primary fraction is called light cycle oil (LCO) and contains high percentages of monoaromatic and diaromatic compounds plus olefins and heavier branched paraffins. Unhydrotreated LCO is often quite unstable and has a very low cetane number. For this reason, it is blended into diesel fuel in controlled amounts. Heavy cycle oil and heavy naphtha are additional side cuts that can be produced. These streams can be pumped around to remove heat from the fractionator, used to supply heat to other refinery units, or used as low-quality blendstock component. [Pg.11]

FCC Residual Heavy Cycle Oil Slurry Oil Decant Oil Clarified Oil - This heavy... [Pg.11]

Both light cycle oil and heavy cycle oil can be blended into diesel fuel. Since cycle oil contains olefinic compounds, the potential for fuel oxidation and darkening is high. [Pg.207]

The kinetic scheme does not account for the formation of HCO (heavy cycle oil), which are the fractions produced in addition to gasoline. In refineries, the only fraction that is recycled is HCO and in order to calculate it, the ratio of HCO/ HCO + LCO + CSO) is obtained from plant data. [Pg.441]

Part or all of three FCC products heavier than gasoline can be recycled from the fractionator back to the reactor the light cycle oil which at Toledo is a prime hydrocracker feed, the heavy cycle oil which is usually recycled, and the bottoms or slurry oil, part of which must be recycled to return entrained catalyst to the unit. The program offers six recycle options. For any option, the user specifies five out of the following eight recycle variables ... [Pg.431]


See other pages where Heavy cycle oil is mentioned: [Pg.501]    [Pg.39]    [Pg.80]    [Pg.59]    [Pg.92]    [Pg.262]    [Pg.264]    [Pg.264]    [Pg.279]    [Pg.280]    [Pg.287]    [Pg.287]    [Pg.287]    [Pg.288]    [Pg.288]    [Pg.288]    [Pg.290]    [Pg.296]    [Pg.325]    [Pg.28]    [Pg.28]    [Pg.121]    [Pg.103]   
See also in sourсe #XX -- [ Pg.2 , Pg.40 ]

See also in sourсe #XX -- [ Pg.188 ]

See also in sourсe #XX -- [ Pg.147 ]




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