Title of article :
Reduction of light cycle oil in catalytic cracking of bitumen-derived crude HGOs through catalyst selection
Author/Authors :
Ding، نويسنده , , Fuchen and Ng، نويسنده , , Siauw H. and Xu، نويسنده , , Chunming and Yui، نويسنده , , Sok، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2007
Pages :
13
From page :
833
To page :
845
Abstract :
In an attempt to reduce the production of light cycle oil (LCO), a non-premium fluid catalytic cracking (FCC) product in North America, a large-pore catalyst containing rare-earth-exchanged Y (REY) zeolite, was used to crack two Canadian bitumen-derived crude heavy gas oils (HGOs) hydrotreated to different extents. For comparison, a regular equilibrium FCC catalyst with ultra-stable Y (USY) zeolite and a conventional western Canadian crude HGO were also included in the study. Cracking experiments were conducted in a fixed-bed microactivity test (MAT) reactor at 510 °C, 30 s oil injection time, and varying catalyst-to-oil ratios for different conversions. The results show that pre-cracking of heavy molecules with wide-pore matrix, followed by zeolite cracking, enhanced conversion at the expense of light and heavy cycle oils at a constant catalyst-to-oil ratio, giving improved product selectivities (e.g., higher gasoline and lower dry gas, LCO, and coke yields, in general, at a given conversion). To systematically assess the benefits of employing the specialty catalyst over the regular catalyst in cracking Canadian HGOs, individual product yields were compared at common bases, including constant catalyst-to-oil ratios, conversions, and coke yields for three feeds, and at maximum gasoline yield for one feed. In most cases, the preferred choice of large-pore zeolite-rich catalyst over its counterpart was evident. The observed cracking phenomena were explained based on properties of catalysts and characterization data of feedstocks, including their hydrocarbon type analyses by gas chromatograph with a mass-selective detector (GC-MSD).
Keywords :
Light cycle oil , Gasoline precursors , LCO precursors , Ultra-stable Y zeolite , Rare-earth-exchanged Y zeolite , MAT unit , Large-pore matrix , Bitumen-derived crude
Journal title :
Fuel Processing Technology
Serial Year :
2007
Journal title :
Fuel Processing Technology
Record number :
1507507
Link To Document :
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