Gas oil coker

Residues (petroleum), heavy coker and light vacuum Residues (petroleum), catalytic reformer fractionator Residues (petroleum), hydrodesulphurized atmospheric tower Residues (petroleum), topping plant, low sulphur Residues (petroleum), heavy coker gas oil and vacuum gas oil Residues (petroleum), thermal cracked... 

Light coker gas oil Heavy coker gas oil Bottoms slurry oil (4.5 ft/sec min.)... 

Olefins are not the preferred feedstocks to an FCC unit. This is not because olefins are inherently bad, but because olefins in the FCC feed indicate thermally produced oil. They often polymerize to form undesirable products, such as slurry and coke. The typical olefin content of FCC feed is less than 5 wt%, unless unhydrotreated coker gas oils are being charged. 

Feedstock quality. The quality of the FCC feedstock impacts the concentration of coke on the catalyst entering the regenerator. A heavier feed containing a higher concentration of coker gas oil will directionally increase the delta coke as compared with a lighter, resid-free feedstock. 

Stripping steam should be adjusted and its influence on regenerator temperature observed. It should be high enough that no further drop in temperature is observed when the steam rate increases. If resid is added to the unit or coker gas oils are coprocessed, the steam rate to the stripper will usually be higher. When capacity of the unit is increased by raising reactor pressure, the stripper operation will require reoptimization. 

The two feeds for which the correlation gave the highest error are heavy, low API, and already preprocessed feed streams. One is DM0 from Gulf Coast and the other is Coker Gas Oil from Mid West. The H-NMR spectra features summarized in Figure 12.3a and b don t provide good clues about any special properties or features of the two feeds that resulted in the highest error for API prediction. One possible explanation for the poor API prediction for these two feeds is that in the analyzed set of feed samples the low API population was underrepresented. 

Refinery alkylation processes utilize either sulfuric acid or hydrofluoric acid as reaction catalysts. The feedstock for both alkylation processes originates primarily from hydrocracking and catalytic cracking operations. Coker gas oils also serve as feedstock in some applications. The differences and similarities between sulfuric acid alkylation and hydrofluoric acid alkylation are shown in TABLE 2-5. Typical alkylation reactions are shown in FIGURE 2-9. A sulfuric acid alkylation unit is illustrated in FIGURE 2-10. 

Characteristics of feedstock quality, recycle ratio, and drum pressure affect the coke yield. Highly aromatic feedstock contains more carbon per feed volume and typically produces a high coke yield. Heavy coker gas oil can be recycled back into the coker feedstock to help improve the coke yield. Also, increasing the coking drum pressure tends to increase the coke yield. Typically, a higher coke yield results in a reduced liquid product yield. 

Crude oil typically contains little to no olefinic compounds. Through refining and processing, however, olefins are produced and become a part of various crude oil fractions. Olefins can be found in thermally cracked and catalytically cracked gasoline fractions as well as in FCC cycle oils and coker gas oils. For this reason, it is not unusual for finished gasoline and distillate blends to contain a high-olefin-content stream. 

A high carbon value for gasoline, jet fuel or 2 fuel oil is a good indication that the fuel has been contaminated with residual fuel oil. Heavy streams such as VGO, coker gas oil, and 6 fuel oil can contaminate gasoline, jet fuel and diesel fuel. These streams tend to form carbon residue when pyrolyzed and can be identified as fuel contaminants through carbon residue testing. 

Fuel refiners will sometimes blend low levels of coker gas oil or vacuum gas oil into diesel fuel. These high-boiling-point fractions may contain high-molecular-weight polycyclic aromatic compounds which can eventually precipitate to form fuel-insoluble sludge and deposits. 

May contain a high concentration of FCC cycle oil, vacuum gas oil, or coker gas oil... 

Vacuum gas oil and light coker gas oil blended into fuel may be contributing to stability problems... 

The deasphalted oil is sent to the delayed coker where it is combined with the heavy coker gas oil from the coker fractionator and sent to the heavy coker gas oil stripper where low-boiling hydrocarbons, are stripped off and returned to the fractionator. The stripped deasphalted oil/heavy coker gas oil mixture is re-... 

Some initial, very short deactivation studies were carried out with a blend of straight run VGO and coker gas oil (CGO). The test conditions were P = 100 atm., LHSV - 2.25 h T = 200°C or 375°C, The products from these experiments were collected at an interval of 3 minutes from the beginning of each run. Each product sample was analyzed for sulfur and nitrogen and fractionated into aliphatics as well as mono-, di-, tri- and polyaromatic compounds. Further details in [6],... 

Catalytic cracking is one of the most important refinery processes, in which a hot heavy oil feed, such as virgin gas oil, coker gas oil, or residual oil, is brought into intimate contact with catalyst particles to convert it into more valuable light oil and olefinic gas products. As cracking proceeds, some... 

Hydrocracker Trickle phase catalytic Convert gas oils, coker gas oil, and light catalytic cycle oil to lighter products... 

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