Study of cracking FCC naphtha in a secondary riser of the FCC unit for maximum propylene production

Wang, Gang; Chen, Xu; Gao, Jinsen

doi:10.1016/j.fuproc.2008.02.007

Cited by 65 publications

(50 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Many types of zeolites have been investigated for the catalytic cracking of naphtha to produce ethylene and propylene including ZSM-5 zeolites, zeolite A, zeolite X, zeolite Y, zeolite ZK-5, zeolite ZK-4, synthetic mordenite, dealuminated mordenite, as well as naturally occurring zeolites including chabazite, faujasite, mordenite [2][3][4][5]. High selectivity to light olefins depends on the extent of reaction, reaction path and residence time, which are determined by the zeolite acidity, pore structure and crystal size [2].…”

Section: Introductionmentioning

confidence: 99%

Enhancing the Production of Light Olefins by Catalytic Cracking of FCC Naphtha over Mesoporous ZSM-5 Catalyst

2010

View full text Add to dashboard Cite

The enhanced production of light olefins from the catalytic cracking of FCC naphtha was investigated over a mesoporous ZSM-5 (Meso-Z) catalyst. The effects of acidity and pore structure on conversion, yields and selectivity to light olefins were studied in microactivity test (MAT) unit at 600°C and different catalyst-to-naphtha (C/N) ratios. The catalytic performance of Meso-Z catalyst was compared with three conventional ZSM-5 catalysts having different SiO 2 /Al 2 O 3 (Si/Al) ratios of 22 (Z-22), 27 (Z-27) and 150 (Z-150). The yields of propylene (16 wt%) and ethylene (10 wt%) were significantly higher for Meso-Z compared with the conventional ZSM-5 catalysts. Almost 90% of the olefins in the FCC naphtha feed were converted to lighter olefins, mostly propylene. The aromatics fraction in cracked naphtha almost doubled in all catalysts indicating some level of aromatization activity. The enhanced production of light olefins for Meso-Z is attributed to its small crystals that suppressed secondary and hydrogen transfer reactions and to its mesopores that offered easier transport and access to active sites.

show abstract

Section: Introductionmentioning

confidence: 99%

Enhancing the Production of Light Olefins by Catalytic Cracking of FCC Naphtha over Mesoporous ZSM-5 Catalyst

2010

View full text Add to dashboard Cite

show abstract

“…1,2 Originally, the light olefins were commonly provided as byproducts through the steam cracking and fluid catalytic cracking (FCC) of naphtha and other oil. 3 However, the output of these processes as byproducts cannot meet the increasing demand of the market. So in recent decades great efforts have been contributed to the research of catalytic dehydrogenation of light alkane to olefins.…”

Section: Introductionmentioning

confidence: 99%

“…According to Su's report, 42 the carbon materials, with a variable sp 2 -/sp 3 -carbon ratio, possessed lots of defects/vacancies on its surface, which could act as active sites for the DDH of propane. Coke might also contained a certain amount of defects/vacancies, which kept the reaction activity at a relatively low level.…”

mentioning

confidence: 99%

Insights into the carbon catalyzed direct dehydrogenation of isobutane by employing modified OMCs

Zhang

Yang

Wang

et al. 2016

Catal. Sci. Technol.

View full text Add to dashboard Cite

To identify the possible reaction mechanism of carbon-based catalysts for the isobutane direct dehydrogenation (DDH) reaction, a series of modified ordered mesoporous carbons (OMCs) with different surface oxygen contents were prepared and employed as representative catalysts. The OMCs were synthesized by employing SBA-15 as template, and the different oxygen contents were realized by the subsequent oxidation and reduction treatments. According to the characterization results, the treatments have significantly influenced the surface properties, while no obvious change was observed in their pore structure. The differences of surface properties due to the different treatments, and the changes in pore structure and oxygen contents after being used as catalysts, were employed to identify the possible active sites in the carbon catalyzed direct dehydrogenation (DDH) of isobutane. The carbon-based catalysts kept a good stability over a long period of time. The activity was mainly provided by the defects/vacancies on the surface of the carbon materials, and generated coke was also found to be active at a relatively lower level.

show abstract

“…Having higher light olefin yields, lower energy consumption, and wider feed scope are a number of advantages of this process over conventional steam cracking. The catalytic pyrolysis feeds include butane [1,2] or heavier alkanes [3,4], butene [5,6] or heavier olefins [7][8][9], 5 raffinate [10], natural gasoline [11], naphtha [12,13], fluid catalytic cracking naphtha [14,15], coker naphtha [15], gas oil [16,17], heavy oil [18,19], waste tire [20], plastic mixture [21], and bio-oil or biomass [22,23].…”

Section: Introductionmentioning

confidence: 99%

Nine-Lump Kinetic Study of Catalytic Pyrolysis of Gas Oils Derived from Canadian Synthetic Crude Oil

Zhang

Liu

et al. 2016

International Journal of Chemical Engineering

View full text Add to dashboard Cite

Catalytic pyrolysis of gas oils derived from Canadian synthetic crude oil on a kind of zeolite catalyst was conducted in a confined fluidized bed reactor for the production of light olefins. The overall reactants and products were classified into nine species, and a nine-lump kinetic model was proposed to describe the reactions based on appropriate assumptions. This kinetic model had 24 rate constants and a catalyst deactivation constant. The kinetic constants at 620 ∘ C, 640 ∘ C, 660 ∘ C, and 680 ∘ C were estimated by means of nonlinear least-square regression method. Preexponential factors and apparent activation energies were then calculated according to the Arrhenius equation. The apparent activation energies of the three feed lumps were lower than those of the intermediate product lumps. The nine-lump kinetic model showed good calculation precision and the calculated yields were close to the experimental ones.

show abstract

Study of cracking FCC naphtha in a secondary riser of the FCC unit for maximum propylene production

Cited by 65 publications

References 16 publications

Enhancing the Production of Light Olefins by Catalytic Cracking of FCC Naphtha over Mesoporous ZSM-5 Catalyst

Enhancing the Production of Light Olefins by Catalytic Cracking of FCC Naphtha over Mesoporous ZSM-5 Catalyst

Insights into the carbon catalyzed direct dehydrogenation of isobutane by employing modified OMCs

Nine-Lump Kinetic Study of Catalytic Pyrolysis of Gas Oils Derived from Canadian Synthetic Crude Oil

Contact Info

Product

Resources

About