Catalytic cracker bottoms

Unlike coke produced from coal, petroleum cokes are derived from the residua of petroleum refining. Suitable feedstocks for good quality coke are thermal tars, catalytic cracker bottoms, and decant oils [17]. 

Aromatic Pitches from the Asphaltene-Free Distillate Fraction of Catalytic Cracker Bottoms... 

This chapter describes the preparations and characteristics of highly aromatic and highly anisotropic pitches from the distillate fraction of catalytic cracker bottoms (CCB). CCB is the aromatic residue from a catalytic cracking process. 

Catalytic Cracker Bottoms (CCB) which is the heavy residue from the catalytic cracking of petroleum distillate is a common aromatic feedstock used for synthetic carbons and pitch production. CCB, like other heavy aromatic feedstock, is composed of alkyl-substituted polycondensed aromatics with a very wide molecular weight distribution. 

Figure 3 Crude fractionation (crude distillation, three stages). An atmospheric fractionating stage produces lighter oils. An initial vacuum stage produces lube oils. A second vacuum stage fractionates bottoms from the other stages to produce asphalt and catalytic cracker feed. (From Ref. 5.)...

Decant oil the highest boiling product from a catalytic cracker also referred to as slurry oil, clarified oil, or bottoms. 

The design vs r rate in the slurry section of a catalytic cracker fractionator did not allow for vaporization which occurs when a bottom feed with 300°F superheat contacts column liqtiid. Column therefore prematurely flooded. Problem solved by iqiecting subcooled quench liquid to desuperheat the feed. At a later stage, subcooled quench was replaced by a lifter liqtiid that vaporized, and premature flooding reoccurred. 

Petroleum pitch can be obtained from a wide variety of sources such as from the bottoms of catalytic crackers, steam cracking of naphtha and gas oils, and residues from various distillation and refinery processes. The crude product is given an initial refining process, which can include one, or a combination of, several treatments ... 

A part of the bottom section of a fluidized bed catalytic cracker was simulated in 2D using the Eulerian-Eulerian gas-solid flow model presented in Section 13.7 and the 10-lump kinetic model of Jacob et al. [1976] introduced in Section 13.8.1. The simulations aimed at illustrating to what extent a model of this type is capable of describing the details and dynamics of the complex gas-solid flow and species fields. 

Furnace carbon black is produced from the incomplete combustion of what is called carbon black oil feedstock, which consists of heavy aromatic residue oils. In the United States this oil is commonly the bottoms from catalytic cracker units. They are commonly referred to as cat cracker bottoms and contain relatively low hydrogen content (and conversely high carbon content). In Europe and other locations, the carbon black oil used is commonly a byproduct of high-temperature steam cracking of such products as naphtha, gas condensate, and gas oil to produce ethylene, propylene, and other olefins. Here, no catalysts are used in the cracking process. These types of carbon black oils are mainly unsaturated hydrocarbons. A third source of carbon black feedstock is coal tar, which is commonly used in China to manufacture carbon black. 

Refinery sour water originates largely from delayed coker, hydrode-sulferizer reactor effluents, and catalytic cracker and visbreaker fractionators. The main contaminants are NHj and H S. Sour water stripper bottoms are reused in two places ... 

Figure 3.35 shows a process flow diagram of Phillips MTBE/ETBE/TAME process. This process is often called the Phillips Etherification Process. The reaction section (1,2) which receives methanol and isobutene concentrate, contains an ion exchange resin. The isobutene concentrate may be mixed olefins from a Fluid Catalytic Cracking Unit (FCCU) or steam cracker or from the on-purpose dehydration of isobutene (Phillips STAR process). High purity MTBE (99 wt%) is removed as a bottoms product from the MTBE fractionator (3). AH of the unreacted methanol is taken overhead, sent to a methanol... 

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