A thermoanalytical study of the co-pyrolysis of coal-tar pitch and petroleum pitch

Pérez, Manuel García; Granda, Marcos; Santamarı́a, Ricardo; Morgan, Trevor; Menéndez, Rosa

doi:10.1016/j.fuel.2003.11.012

Cited by 86 publications

(43 citation statements)

References 9 publications

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“…The first peak appears at 245 °C, and the weight loss is 8 wt%. The first peak can be attributed to the distillation of the volatile compounds that are stable at their boiling point [13], while the second peak at 345 °C indicates the removal of light compounds and gases due to cracking and polymerization reactions. In addition, it was observed that during distillation the temperature increased dramatically from room temperature to 200 °C (7 °C/min) and then it slowed down at 245 °C (1.83 °C/min) and 345 °C (1.22 °C/min).…”

Section: Resultsmentioning

confidence: 99%

Heat Treatment of Pitch Obtained from Atmospheric Fixed-Bed Coal Gasification

Phiciato¹,

Monika²,

Hardian

2018

Indones. J. Chem.

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A medium temperature pitch obtained from atmospheric fixed-bed gasifier was distilled at a various time (1, 2, 3 and 4 h) 27). ABSTRAK Pitch suhu medium yang diperoleh dari gasifikasi batubara tipe fixed-bed, didestilasi pada berbagai variasi waktu (1, 2, 3 dan 4 jam) untuk memicu polimerisasi dan kemudian hasilnya dibandingkan dengan pitch ter batubara komersial (CTP). Tingkat aromatisitas pitch dievaluasi dengan menggunakan spektroskopi inframerah, analisis unsur dan analisis termogravimetri simultan (TG-DSC

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Section: Resultsmentioning

confidence: 99%

Heat Treatment of Pitch Obtained from Atmospheric Fixed-Bed Coal Gasification

Phiciato¹,

Monika²,

Hardian

2018

Indones. J. Chem.

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“…Distillation of coal tar leaves behind coal tar pitch (CTP), a thick black liquid with viscosity even higher than coal tar. CTP is a complex mixture of polyaromatic hydrocarbons [1,2]. Problems of separation into components are somewhat similar as in petroleum [3].…”

Section: Introductionmentioning

confidence: 99%

Mesophase Microspheres From Distillation and Thermal Treatment of Coal Tar

Martínez-Flores¹,

Camporredondo-Saucedo²,

Moreno-C³

et al. 2017

ChChT

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Abstract. 1 We have investigated the formation of mesophase carbon microbeads in tar pitch generated by the coal coking in a steelmaking plant. Pitches were obtained at different distillation temperatures (643, 673 and 723 K). The distilled samples were then thermally treated in nitrogen atmosphere either at 723 K for 8 h (T1) for at 703 K for 4 h (T2). A new phase appears, seen in optical microscopy with a polarizing filter. Samples subjected to the T1 thermal treatment were found to form a discontinuous fluid phase distinct from the main phase. Formation of mesophase carbon microbeads is seen also in samples subjected to the T2 treatment, with the particle diameters from 30 to 60 µm. The microbeads can be used as precursors for the synthesis of graphitic materials.

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“…Moreover, halogen determination in this matrix is still more difficult when considering the risks of losses and contamination during the sample preparation step. [2][3][4]10,14 Despite the fact that the determination of major elements, such as sulfur, in pitch can be carried out using elemental analyzers, 5,13,15,16 these instruments are not suitable for determination of other non-metals (e.g., Br and I). Moreover, there are no methods in the literature for pitch digestion for further simultaneous determination of halogens and sulfur.…”

Section: Introductionmentioning

confidence: 99%

Determination of halogens and sulfur in pitch from crude oil by plasma-based techniques after microwave-induced combustion

Pereira

Frohlich

Duarte

et al. 2015

J. Anal. At. Spectrom.

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This work demonstrates the feasibility of halogen and sulfur determination in pitch produced from crude oil residues by inductively coupled plasma mass spectrometry (ICP-MS) and inductively coupled plasma optical emission spectrometry (ICP-OES), respectively, after digestion by microwave-induced combustion (MIC). Using the proposed system, it was possible to achieve a very effective digestion of pitch (up to 400 mg) using 20 bar of oxygen and 50 mL of 6 mol L À1 of ammonium nitrate as an ignition aid. Water and NH 4 OH solutions (10 to 100 mmol L À1 ) were evaluated for analyte absorption and a reflux step was applied after combustion in order to ensure quantitative analyte absorption. The volume of absorbing solution (6, 8, 10 and 12 mL) was also evaluated and best results were obtained using 6 mL confirming the results of previous studies. Accuracy was evaluated by comparison of results with those obtained using a total Cl and S analyzer, X-ray fluorescence (XRF, for Cl and S determination) and pyrohydrolysis followed by ICP-MS determination (Br and I). By using 50 mmol L À1 NH 4 OH as the absorbing solution the agreement with reference values ranged from 95 to 103% for all analytes. The results obtained using MIC presented an agreement of 101 and 100% with those obtained using a total Cl and S analyzer, respectively. The results were also compared with XRF analysis (for Cl and S) and agreement was 102 and 92%, respectively. In the same way, the results obtained by MIC were in agreement with those obtained by the pyrohydrolysis method (agreement of 97 and 105% for Br and I, respectively). The residual carbon content of MIC digests was always below 1% showing the high efficiency of pitch digestion. Using 400 mg of sample mass and 6 mL of 50 mmol L -1 NH 4 OH as the absorbing solution, limits of detection were 3.1 mg g À1 for S by ICP-OES and 3.2, 0.02 and 0.002 mg g À1 for Cl, Br and I by ICP-MS, respectively.

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A thermoanalytical study of the co-pyrolysis of coal-tar pitch and petroleum pitch

Cited by 86 publications

References 9 publications

Heat Treatment of Pitch Obtained from Atmospheric Fixed-Bed Coal Gasification

Heat Treatment of Pitch Obtained from Atmospheric Fixed-Bed Coal Gasification

Mesophase Microspheres From Distillation and Thermal Treatment of Coal Tar

Determination of halogens and sulfur in pitch from crude oil by plasma-based techniques after microwave-induced combustion

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