Mesophase formation behavior in petroleum residues

Kumar, Subhash; Srivastava, Manoj

doi:10.5714/cl.2015.16.3.171

Cited by 27 publications

(9 citation statements)

References 33 publications

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“…So, it can maintain the fluidity of the CTP 3 during high‐temperature carbonization. [ 34,35 ] At the same time, CD contained a large amount of H γ and a certain amount of H n . It showed that the main structure of hydrogenated coal diesel contained a certain amount of alkanes and naphthenes.…”

Section: Resultsmentioning

confidence: 99%

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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Section: Resultsmentioning

confidence: 99%

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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“…FT-IR spectroscopy is also a useful technique to calculate aromaticity index of two different pitches by taking absorbance value at 3050 cm −1 and 2920 cm −1 . The aromaticity index of pitches was calculated by following equation I ar = Abs 3050 /(Abs 3050 + Abs 2920 ) [10,12] which is presented in Fig. 4.…”

Section: Ft-ir Analysismentioning

confidence: 99%

Enhancement of mesophase formation in paraffinic-rich clarified oil using transition metal catalysts (Cr and Cu)

Kumar

Srivastava

2019

Appl Petrochem Res

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In the present work, we have made attempts to prepare petroleum pitches from paraffinic-rich clarified oil (CLO) by giving thermal treatment at 370 °C in the presence of Cu and Cr catalysts. The feed CLO is predominantly paraffinic in nature, so it takes fairly large thermal soaking time (21 h) to convert into pitch having mesophase content below countable limits. To increase the mesophase content in the pitch or to make mesophase pitch, 3 wt % transition metal catalysts (Cu and Cr) were added to CLO. Addition of transition metal catalysts not only enhances mesophase formation but also helps to reduce thermal treatment time by promoting polymerization and condensation reactions at a faster rate. The mesophase formation pattern reveals that Cu and Cr catalysts increase the mesophase content from below countable limit to 12 and 9 vol %, respectively. This indicates that Cu and Cr showed better catalytic activity for mesophase formation growth. The effect of transition metal catalysts on physico-chemical properties (softening point, coking value, toluene insolubles and quinoline insolubles) as well as the optical texture and physical properties of mesophase pitches were investigated by optical microscope, FT-IR, SEM, NMR, TG/DTG and XRD.

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“…상기 고분자 용액을 실온까지 식힌 후, AAc (15 mL), GA (1 mL), EGDMA (1.5 mL), 및 KPS (2 wt% dissolved in water, 1 mL) 를 첨가하고, 이를 실온에서 3 min 동안 교반하였다. 또한, 메조페이 스 핏치는 탄소물질의 가교결합의 증가 및 고온 열처리 동안에 심하 게 팽창되는 것을 억제하기 위하여 300 ℃에서 2 h 동안 공기분위기 에서 안정화 반응을 진행하였다 [23,24]. 이렇게 제조된 100 µm 이하 …”

Section: 메조페이스 핏치기반 그라파이트 폼의 제조unclassified

Fabrication and Characteristics of Mesophase Pitch-Based Graphite Foams Prepared Using PVA-AAc Solution

Kim¹,

Lee

Jeong³

et al. 2015

Applied Chemistry for Engineering

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Graphite foams (GFs) were prepared by adding different amounts of mesophase pitch (MP) into polyvinyl alcohol-acrylic acid (PVA-AAc) solution followed by the heat treatment. It was confirmed that the pore diameters of GFs were controlled by the slurry concentration, which was the mesophase content added in polymer solution, and their thermal conductivity and compressive strength were also controlled by porosities of GFs formed at different conditions. The resulting GFs in this study had the highest thermal conductivity of 53.414 ± 0.002 W/mK and compressive strength of 1.348 ± 0.864 MPa at 0.69 in porosity. The thermal conductivity of MP based GFs increased approximately 23 times higher than that of using isotropic pitch based GFs due to the developed graphitic structure.

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Mesophase formation behavior in petroleum residues

Cited by 27 publications

References 33 publications

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

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

Enhancement of mesophase formation in paraffinic-rich clarified oil using transition metal catalysts (Cr and Cu)

Fabrication and Characteristics of Mesophase Pitch-Based Graphite Foams Prepared Using PVA-AAc Solution

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