Pyrolysis of petroleum residues: I. Yields and product analyses

Escandell, Manuel Martínez; Torregrosa, Pilar Coloma; Marsh, H.; Rodríguez‐Reinoso, F.; Santamarı́a-Ramı́rez, R.; Gómez-de-Salazar, C.; Romero-Palazón, E

doi:10.1016/s0008-6223(99)00028-7

Cited by 51 publications

(26 citation statements)

References 7 publications

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“…The characteristics of the petroleum residues and their treatments can be found elsewhere (DO and PY as R2 and R1, respectively) [8,9]. The pyrolysis conditions for each residue (Table 1) were selected in order to prepare two mesophase pitches with low mesophase content (DO10 and PY56), and two with high mesophase content (DO100 and PY100).…”

Section: Mesophase Pitch Preparationmentioning

confidence: 99%

Very high methane uptake on activated carbons prepared from mesophase pitch: A compromise between microporosity and bulk density

Casco

Escandell

Kaneko

et al. 2015

Carbon

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Please cite this article as: Casco, M.E., Martínez-Escandell, M., Kaneko, K., Silvestre-Albero, J., Rodríguez-Reinoso, F., Very high methane uptake on activated carbons prepared from mesophase pitch: a compromise between microporosity and bulk density, Carbon (2015), doi: http://dx.doi.org/10.1016/j.carbon. 2015.05.029 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractTwo petroleum residues were pyrolysed under two different conditions to obtain pitches with low or high mesophase content. The effect of the KOH: precursor ratio and the activation temperature on the packing density and porous texture of the carbons have been studied and optimized. Activated carbons combining high micropore volume (>1 cm 3 /g) and high packing density (0.7 g / cm 3 ) have been successfully prepared.Regarding excess methane adsorption capacities, the best results (160 cm 3 (STP) / cm 3 at 25 ºC and 3.5 MPa) were obtained using the pitch with the higher content of the more organized mesophase, activated at relatively low temperature (700ºC), with a medium

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Section: Mesophase Pitch Preparationmentioning

confidence: 99%

Very high methane uptake on activated carbons prepared from mesophase pitch: A compromise between microporosity and bulk density

Casco

Escandell

Kaneko

et al. 2015

Carbon

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“…In 1999, Martínez-Escandell et al 94 studied the pyrolysis of three types of petroleum feedstocks (R1-aromatic, R2-low aromaticity and R3 -almost totally aliphatic feedstock) to understand the effect of the initial aromaticity of the raw material on the mesophase formation. Variations were introduced into the maximum pyrolysis temperature (T) 420-480 ºC, the pressure (P) 0.1-1.0 MPa, and soak time 0-12 h, in various combinations.…”

Section: Ito Chose the Values Of [F(r X ) A ] And [F(r X ) L ]mentioning

confidence: 99%

“…R2 (intermediate aromaticity) reacted more slowly than expected to give highly ordered mesophase. 94 In 2000, Torregrosa-Rodriguez et al, 95 using exactly the same feedstocks of Martínez-Escandell et al 94 continued the investigations of the latter to understand the effect of the initial aromaticity of the raw material on the mesophase formation. The same research conditions were used in both cases and the former authors concluded that at the completion of the pyrolysis reactions, semicokes from the two petroleum residues possessed very similar aromaticity, despite significant differences in the initial aromaticity of the parent feedstocks.…”

Section: Ito Chose the Values Of [F(r X ) A ] And [F(r X ) L ]mentioning

confidence: 99%

“…10 Ultimately, it is the chemistry of the pyrolysis system that controls the structure and properties of resultant semicokes/ cokes/ carbons, but, the chemistry, in turn, is a function not only of the chemical properties of the original feedstocks, but also of the physical parameters incorporated into the system, such as heating rate, soak time, final reaction temperature and pressure within the system. 11 Dependent upon how the pyrolysis system is constructed, e.g. whether or not volatile material is lost from or retained within the pyrolysis system, these physical parameters control the chemical composition of the feedstock as it is pyrolysed through to a semicoke.…”

Section: Introductionmentioning

confidence: 99%

“…12 The physico-chemical behaviour of coking, which also includes flow movement or turbulence within the liquid (fluid) carbonization system, caused by thermal flow and gas evolution from the system, also affects semicoke properties. 11 Restrictive environmental legislation concerning the emission of toxic and carcinogenic fumes at work and the closing of numerous coke plants in some countries have led to the search for new pitches capable of replacing, at least in part, coal-tar pitches. In this respect, petroleum pitches could be a good alternative to competing in a market, which until now has been exclusively dominated by coal-tar pitches.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Anisotropy and mesophase formation towards carbon fibre production from coal tar and petroleum pitches: a review

Castro¹

2006

J. Braz. Chem. Soc.

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A mesofase é o fator determinante para se produzir as propriedades e microestruturas desejadas dos materiais de carbono. A remoção das moléculas mais leves é necessária para sua produção, mas o rendimento pode ser melhorado com a utilização de pressão ou oxidação, antes da remoção das mesmas. Piches anisotrópicos podem ser produzidos através das tradicionais esferas de mesofase de Brooks e Taylor, ricas em resinas α, ou evitando-se as mesmas, através de outras técnicas, como a extração com solventes ou agitação intensa, para gerar, quase que exclusivamente, as resinas β. Piches anisotrópicos, contendo valores próximos a 100% de resinas β, têm sido fiados a temperaturas mais baixas, produzindo fibras de carbono de piche de maior qualidade. Estudos recentes mostraram, experimentalmente, porque os piches exibem comportamentos tão diferentes, no que diz respeito à produção da fibra de carbono, quando suas composições variam em termos de resinas α e β.Mesophase is a key issue to design carbon materials towards its properties and microstructures. The understanding of this intermediate phase has changed since it was first discovered. The removal of light molecules is necessary to produce mesophase, but the yield can be improved if other techniques, such as pressure and oxidation, can be used before they are carried out of the system, with nitrogen or vacuum. Anisotropic pitches can be produced throughout the traditional Brooks and Taylor mesophase spheres, rich in α-resins, or, avoiding them, with other techniques, such as solvent extraction or strong agitation, to generate, almost exclusively, β-resins. Anisotropic pitches exhibiting almost 100% β-resins have been meltspun at lower temperatures, producing pitch carbon fibres of higher quality. Recent studies were able to explain why the behaviour of the pitches is so different, towards the pitch carbon fibre production, when their compositions, in terms of α-resins and β-resins, change.

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Adsorption on Heterogeneous Surfaces: Site Energy Distribution Functions from Fritz–Schlüender Isotherms

et al. 2010

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Different site energy distribution functions based on the condensation approximation method are proposed for the liquid-phase or gas-phase adsorption equilibrium data following the Fritz-Schlüender isotherm. Energy distribution functions for the four limiting cases of the Fritz-Schlüender isotherm are also discussed. The proposed models are successfully applied to the experimental equilibrium data of nitrogen molecules at 77 K on a pitch-based activated carbon (PA) and a pitch-based activated carbon containing boron (PBA). An energy distribution function based on FS isotherm containing five parameters suggest a unimodal distribution of binding sites for carbon PA, the binding site energies being distributed as exponential or unimodal, depending on the pressure, in the case of carbon PBA. The advantages of the proposed models are discussed.

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Pyrolysis of petroleum residues: I. Yields and product analyses

Cited by 51 publications

References 7 publications

Very high methane uptake on activated carbons prepared from mesophase pitch: A compromise between microporosity and bulk density

Very high methane uptake on activated carbons prepared from mesophase pitch: A compromise between microporosity and bulk density

Anisotropy and mesophase formation towards carbon fibre production from coal tar and petroleum pitches: a review

Adsorption on Heterogeneous Surfaces: Site Energy Distribution Functions from Fritz–Schlüender Isotherms

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