Needle coke formation derived from co-carbonization of ethylene tar pitch and polystyrene

Cheng, Xuewu; Zha, Qingfang; <, Zhong Jing-Tao; Yang, Xiaoguang

doi:10.1016/j.fuel.2009.05.006

Cited by 48 publications

(23 citation statements)

References 12 publications

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“…The presence of these absorption bands in the IR spectra of the residues that exhibit no or weak absorption at 6.30-7.20 ppm in the 1 H NMR spectra indicates that the sample contains products of reaction of PS with pitches. The formation of such products in heat treatment of PS with P1 and P2 was also proved in [18,21]. Comparison of the IR and 1 H NMR spectra of the pyrolysis residues shows that the relative contribution of the reactions of PS with pitches, yielding new compounds, is higher with P2, and also at high pitch : PS ratios and at 360°C.…”

Section: S %mentioning

confidence: 77%

“…Simultaneously the softening point of the pyrolysis residues and the amount of more condensed toluene-insoluble compounds in them increase and the yield of volatile matter decreases, except the sample obtained by pyrolysis of the P1-PS mixture containing 23% PS at 360°C: this sample contained a large amount of unchanged PS. The C : H ratio in the toluene-insoluble compounds in the residues from the pyrolysis of the mixtures is lower than in the pitches, which may be due to incorporation of PS fragments into the residues [18,21].…”

Section: S %mentioning

confidence: 91%

“…Co-carbonization of the pitch prepared from ethylene production tar and waste PS was used for preparing needle coke [21]. At the same time, in [15][16][17][18][19][20][21] no data are given on the effect exerted by PS pyrolysis conditions in coal tar pitch on the composition of the low-molecular-weight products and pyrolysis residue, and the chemical interaction of PS with coal tar-pitch in the joint process was not considered.In this study we examined the pyrolysis of PS in coal tar pitch and in ethylene tar pitch prepared from heavy pyrolytic tar from ethylene production plants, with the aim to assess the potentialities of this process both for utilization of waste PS and for production of modifi ed pitches. …”

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confidence: 99%

“…The pitch yield increased, and 10% of the added PS remained in the pitch; a new peak at 460°C, attributable to the degradation of polystyrene fragments in the modifi ed pitch, appeared in the DTG curve of the pitch. Co-carbonization of the pitch prepared from ethylene production tar and waste PS was used for preparing needle coke [21]. At the same time, in [15][16][17][18][19][20][21] no data are given on the effect exerted by PS pyrolysis conditions in coal tar pitch on the composition of the low-molecular-weight products and pyrolysis residue, and the chemical interaction of PS with coal tar-pitch in the joint process was not considered.…”

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confidence: 99%

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Pyrolysis of polystyrene in coal tar and ethylene tar pitches

et al. 2012

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Pyrolysis of polystyrene in the medium of coal tar pitch and of pitch prepared from ethylene production tar was performed in the temperature range 360-420°C at atmospheric pressure.Polystyrene (PS) is one of the most widely used polymers, and utilization of waste PS requires the development of cost-saving and safe technologies [1]. Pyrolysis of polymeric wastes is an effi cient method of their reprocessing. The pyrolysis products are raw materials for the production of fuels or chemicals [2]. In PS pyrolysis, the yield of low-molecular-weight mononuclear aromatic compounds exceeds 95%. Therefore, this process is actively studied as a method for recirculation of the waste polymer [3].The yields and composition of PS pyrolysis products depend on the temperature, presence of catalysts and solvents, type and design of the reactor, and other process conditions [3][4][5][6][7][8][9]. Performing the polymer pyrolysis in solvents allows the conditions of mass and heat transfer in the reaction medium to be improved (otherwise these conditions are unfavorable because of high viscosity of polymer melts) and the process temperature to be decreased [9][10][11]. The solvent can also affect the PS pyrolysis, entering into chemical reactions with the initial polymer or its degradation products.Murakata et al. [9,12] examined the effect of various solvents on the thermal degradation of PS in an autoclave and showed that solvents with high hydrogen donating ability decrease the PS conversion. The major lowmolecular-weight products of PS pyrolysis under these conditions are saturated compounds (ethylbenzene > toluene > styrene). The results are attributed to the hydrogen transfer from solvents to PS degradation products and from PS to solvent radicals. With the aim to increase the styrene yield, Karaduman [13] studied the PS pyrolysis in an autoclave at 350-450°C in phenol, quinone, naphthalene, and diphenylamine. The highest yield of styrene (74%) was attained in naphthalene; in diphenylamine, the styrene yield was lower than when the process was performed without solvent. The amount of the solid pyrolysis residue in the solvents was lower than without solvent.Coal tar pitch can be used as high-boiling solvent for polymers [14]. Studies involving heat treatment of coal tar pitch with PS were primarily aimed at preparing modifi ed asphalt and carbon materials [15][16][17][18]. Carbonization of pitch with 10% PS was studied by Brzozowska et al. [15][16][17], who showed that addition of PS accelerates the formation of the mesophase, affects its structure, and increases the carbonizate yield. Slow heating to 430°C of the toluene-soluble fraction of coal tar pitch with the addition of PS, followed by keeping at high temperature, increases the amount of alkyl groups in the pitch and affects the yield and structural characteristics of the soluble mesophase [18]. Pyrolysis of medium-temperature coal tar pitch at 410-450°C was suggested in a patent [19] for preparing high-temperature modifi ed pitches. Finqueneisel et al. [20] examined the...

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Section: S %mentioning

confidence: 77%

Section: S %mentioning

confidence: 91%

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confidence: 99%

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confidence: 99%

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Pyrolysis of polystyrene in coal tar and ethylene tar pitches

et al. 2012

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“…In this study, the petroleum pitch was prepared using pyrolysis fuel oil (PFO) with heat treatment using polyethylene terephthalate (PET). To control the characteristics of petroleum pitch, studies on the air-blowing process and synthesis using additives such as polyethylene and polystyrene have been researched [26][27][28]. Air-blowing is a polymerization method by which oxygen is added to form crosslinking sites between molecules in the pitch.…”

Section: Introductionmentioning

confidence: 99%

Correlation of EDLC Capacitance with Physical Properties of Polyethylene Terephthalate Added Pitch-Based Activated Carbon

2022

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The electric double-layer capacitor (EDLC) has attracted attention by using activated carbon (AC) as an active electrode material with a high power density and high cost-efficiency in industrial applications. The EDLC has been actively developed over the past decade to improve the power density and capacitance. Extensive studies on EDLCs have been conducted to investigate the relation of EDLC capacitance to the physical properties of AC, such as the specific surface area, pore type and size, and electrical conductivity. In this study, EDLC was fabricated with AC, and its capacitance was evaluated with the physical properties of AC. The AC was prepared using petroleum-based pitch synthesized using pyrolysis fuel oil (PFO) with polyethylene terephthalate (PET). The AC based on PFO and PET (PPAC) exhibited high specific surface area and low micropore fraction compared to the PFO-based AC without PET addition (PAC). Furthermore, the reduction of the EDLC capacitance of PPAC was smaller than that of PAC, as the scan rate was increased from 5 to 100 mV s−1. It was determined that the minor reduction of capacitance with an increase in the scan rate resulted from the development of 4 nm-sized mesopores in PPAC. In addition, a comprehensive correlation of EDLC capacitance with various physical properties of ACs, such as specific surface area, pore characteristics, and electrical conductivity, was established. Finally, the optimal properties of AC were thereupon derived to improve the EDLC capacitance.

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Co‐Carbonization of Medium‐ and Low‐Temperature Coal Tar Pitch and Coal‐Based Hydrogenated Diesel Oil Prepare Mesophase Pitch for Needle Coke Precursor

Tian

Huang

Yu³

et al. 2021

Adv Eng Mater

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Needle coke is a type of high-quality coke with needle-like texture and layer structure. [1] Also, it presents a turbine carbon structure under the scanning electron microscope. [2,3] Needle coke was acknowledged as an exceptional raw material to obtain carbon materials, because it has low coefficient of thermal expansion (CTE), high mechanical strength, easy to graphitization, and other advantages. Therefore, it is widespread used in lithium battery anode materials, high-power, ultrahigh-power graphite electrodes, and so on. [4,5] At present, residual heavy oil, catalytic cracking slurry, and high-temperature coal tar pitch are commonly used to prepare needle coke. [6][7][8] The heavy pitch component of medium-and lowtemperature coal tar has the advantages of high aromaticity, low quinoline insoluble (QI) content, and narrower molecular weight distribution. [9] So, it is an excellent raw material for the preparation of needle coke. However, the higher heteroatom content and saturation in the raw materials lead to higher thermal reaction rate in a carbonization process, which is unfavorable to prepare needle coke and the mesophase with a wide-area streamline structure. [10,11] Because the mesophase with an orderly wide-area streamlined structure is precursor for the production of high-performance green needle coke during the coke is pulled by the airflow. [12] The appropriate pretreatment methods are used to reduce the thermal reactivity of raw materials, which is essential for preparing mesophase pitch. Garcia et al. [11] reported that the

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Needle coke formation derived from co-carbonization of ethylene tar pitch and polystyrene

Cited by 48 publications

References 12 publications

Pyrolysis of polystyrene in coal tar and ethylene tar pitches

Pyrolysis of polystyrene in coal tar and ethylene tar pitches

Correlation of EDLC Capacitance with Physical Properties of Polyethylene Terephthalate Added Pitch-Based Activated Carbon

Co‐Carbonization of Medium‐ and Low‐Temperature Coal Tar Pitch and Coal‐Based Hydrogenated Diesel Oil Prepare Mesophase Pitch for Needle Coke Precursor

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