Catalytic Cracking of a Wilmington Vacuum Gas Oil and Selected Hydrotreated Products

Wells, J.W.

doi:10.1021/bk-1988-0375.ch018

Cited by 2 publications

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“…The microconfined bed unit (MCBU) employed for the cracking experiments was developed at Phillips Petroleum Co. Its operation and applications in catalytic cracking research have been described in several reports and papers. 11,[34][35][36][37][38] The overall apparatus is illustrated in figure 2.…”

Section: Catalytic Crackingmentioning

confidence: 99%

Relating Feedstock Composition to Product Slate and Composition in Catalytic Cracking. 1. Bench Scale Experiments with Liquid Chromatographic Fractions from Wilmington, CA, >650 .degree.F Resid

Green¹,

Zagula²,

Reynolds³

et al. 1994

Energy Fuels

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The catalytic cracking behavior of compound types in the >650°F resid from a Wilmington, CA, 14.2°API crude was investigated. Liquid Chromatography (LC) was used to sepm'ate the resid into eight fractions. These fractions were used as feedstocks for a bench scale fluidized catalytic cracking (FCC) unit. Gasoline was produced almost exclusively from neutral (65 % of whole resid) components. Acidic and basic types were partially converted to coke plus small amounts of C! and C2 gases, with the balance primarily carrying over as heavy liquid products. Gasoline composition depended on the type and quantity of polar compounds present in the feed because both acidic and basic compounds inhibited cracking reactions (13-scission, hydrogen transfer, etc.) to varying degrees. In accordance with prior work, basic nitrogen compounds exhibited the largest inhibitory effect on cracking. Their effect is dependent on concentrations up to a limiting value which may correspond to saturation of susceptible catalyst sites. On an equal weight basis, the effect of high boiling (high molecular weight) bases was less than those occurring in the 650-1000°F distillate range. Pm'titioning of nitrogen present in acidic (e.g. carbazole) forms in the feed into liquid products was greater than for basic nitrogen. Thiophenic forms of sulfur partitioned more into liquid and less into gaseous (H2S) products than sulfide-type sulfur. Coke yield was approximately proportional to microcarbon residue test results for all feeds. Ongoing work with additional feedstocks has indicated behavior similar to that of Wilmington. Selected Wilmington liquid products are undergoing detailed analysis in order to determine relationships between feed versus product composition, particularly with respect to acidic and basic types.

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Section: Catalytic Crackingmentioning

confidence: 99%

Relating Feedstock Composition to Product Slate and Composition in Catalytic Cracking. 1. Bench Scale Experiments with Liquid Chromatographic Fractions from Wilmington, CA, >650 .degree.F Resid

Green¹,

Zagula²,

Reynolds³

et al. 1994

Energy Fuels

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show abstract

“…These data compare favorably with published values except for V, which was specified at 333 ppm . Due to its widespread availability and low quality, Maya is commonly used in process studies and development. − Some of its detailed structural characteristics are known . Its main value for the authors' purpose was its significantly different characteristics from those of either Wilmington or Brass River crudes.…”

Section: Introductionmentioning

confidence: 99%

Relating Feedstock Composition to Product Slate and Composition in Catalytic Cracking. 3. Feedstocks Derived from Maya, a Mexican Crude

et al. 1997

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The fluid catalytic cracking (FCC) behavior of compound types present in the >650°F resid from Maya crude was investigated. Distillation and liquid chromatography were employed for separation of selected compound type fractions from the resid; the resulting fractions were then cracked using a bench-scale FCC unit. The FCC behavior for each compound type was defined in terms of the resulting product distribution (yields of gas, gasoline, etc.); sulfur, nitrogen, nickel, and vanadium partitioning; and, in selected cases, gasoline composition. Results obtained from Maya fractions were compared to those obtained from earlier FCC studies of compound types from Wilmington, CA, and Brass River, Nigeria, >650°F resids. A conceptual model was proposed that adequately predicted FCC product slates obtained from >650°F neutral fractions from Maya and the other crudes. An important premise of the model was primary production of gasoline and C 3 /C 4 gases from alkyl side chains and acyclic paraffins in feeds with concurrent conversion of aromatic and naphthenic cores to cycle oils. The product slates calculated from the model agreed well with those determined experimentally. Highly aromatic feedstock constituents presumably formed only coke and light gases. A calculation of hydrogen transfer resulting from cracking indicated no significant hydrogen exchange between aliphatic gasoline or C 3 /C 4 gas precursors and naphthenic/aromatic cores. Implications of the model toward improving FCC feed pretreatment and performance evaluation are discussed.

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Catalytic Cracking of a Wilmington Vacuum Gas Oil and Selected Hydrotreated Products

Cited by 2 publications

References 0 publications

Relating Feedstock Composition to Product Slate and Composition in Catalytic Cracking. 1. Bench Scale Experiments with Liquid Chromatographic Fractions from Wilmington, CA, >650 .degree.F Resid

Relating Feedstock Composition to Product Slate and Composition in Catalytic Cracking. 1. Bench Scale Experiments with Liquid Chromatographic Fractions from Wilmington, CA, >650 .degree.F Resid

Relating Feedstock Composition to Product Slate and Composition in Catalytic Cracking. 3. Feedstocks Derived from Maya, a Mexican Crude

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