Production of lower alkenes and light fuels by gas phase oxidative cracking of heavy hydrocarbons

Zhu, Haiou; Liu, Xuebin; Ge, Qingjie; Li, Wenzhao; Xu, Hai‐Bing

doi:10.1016/j.fuproc.2006.01.009

Cited by 23 publications

(17 citation statements)

References 11 publications

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“…In contrast, water yields increased dramatically when the ER value exceeded 0.34 in the range studied. (8) Soot yields increased prominently with the thermal cracking temperature increasing, up to 22.6 wt % of raw material, and about 88% of pyrolysis tar was converted into soot at 1100°C in inert conditions. However, a certain number of oxygen atoms can boost soot destruction.…”

Section: Resultsmentioning

confidence: 96%

Experimental Investigation of Tar Conversion under Inert and Partial Oxidation Conditions in a Continuous Reactor

Luo

Chen

et al. 2011

Energy Fuels

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The formation and destruction of pyrolysis tar during the thermal cracking and fuel-rich oxidation have been investigated in a constructed test rig. Temperatures of 700À1100°C and equivalence ratios (ERs) of 0À0.403 were considered, and yields of gravimetric tar, gas, water, and soot were taken into account. In inert conditions, pyrolysis tar thermal cracking was greatly enhanced with the temperature increasing. CO and CH 4 increased almost linearly, and H 2 increased exponentially from 700 to 1100°C; meanwhile, oxygen-containing compounds or substituted 1-ring aromatics were converted into polycyclic aromatic hydrocarbons (PAHs). In the homogeneous reactor, the presence of oxygen induced more tar decomposition compared to inert thermal cracking. When the ER increased from 0 to 0.403 with a constant reactor temperature of 900°C, total tar yields reduced rapidly and reached a minimum value of 0.26 wt % at an ER of 0.34; meanwhile, the mass of noncondensable gases reached a maximum value. However, the mass of combustible gases, such as H 2 , CO, and CH 4 , were sharply reduced as the ER increased from 0.34 to 0.403. Although the aromaticity index increased gradually, most aromatic compound yields increased first and then decreased with the ER increasing, except naphthalene. It is considered that a proper oxygen/fuel ratio can promote the free-radical formation and accelerate the tar destruction, but excess oxygen will burn out most combustible gases.

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Section: Resultsmentioning

confidence: 96%

Experimental Investigation of Tar Conversion under Inert and Partial Oxidation Conditions in a Continuous Reactor

Luo

Chen

et al. 2011

Energy Fuels

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“…For alkenes which undergo substantial cleavage by auto-oxidation, primary products often accumulate and the oxidation soon becomes a co-oxidation process of primary products and alkenes. The gas phase oxidative cracking of higher hydrocarbons involves a series of steps and the formation of products is dependent on the temperature and hydrocarbon to oxygen molar ratios [5]. In the partial oxidation of a mixture of alkene isomers, Subramanian et al [6] showed that the specific hydrocarbon to oxygen molar ratio for each alkene isomer is the important parameter for the conversion of these isomers.…”

Section: Introductionmentioning

confidence: 99%

Studies towards a mechanistic insight into the activation of n-octane using vanadium supported on alkaline earth metal hydroxyapatites

Dasireddy

Friedrich

Singh

2013

Applied Catalysis A: General

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“…Accordingly, aromatic carbons can form gasoline; however, the reaction differs from the cracking reactions of other feed lumps. Reactions among feed lumps are usually not considered; however, the reaction of naphthenic carbon to aromatic carbon was considered in this research because naphthenic rings could convert to aromatic rings by dehydrogenation reaction [36].…”

Section: Establishment Of the Physical Modelmentioning

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

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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.

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Production of lower alkenes and light fuels by gas phase oxidative cracking of heavy hydrocarbons

Cited by 23 publications

References 11 publications

Experimental Investigation of Tar Conversion under Inert and Partial Oxidation Conditions in a Continuous Reactor

Experimental Investigation of Tar Conversion under Inert and Partial Oxidation Conditions in a Continuous Reactor

Studies towards a mechanistic insight into the activation of n-octane using vanadium supported on alkaline earth metal hydroxyapatites

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

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