Preparation and characterization of high softening point and homogeneous isotropic pitches produced from distilled ethylene tar by a novel bromination method

Ge, Chuanzhang; Sun, Zhen-long; Hu, Yang; Long, Donghui; Qiao, Wen-ming; Ling, Licheng

doi:10.1016/j.carbon.2018.02.016

Cited by 6 publications

(3 citation statements)

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“…Some of the oxidizing modification procedures of petroleum asphaltenes with persulfate and peroxide compounds were used for ET-A technogenic asphaltenes in order to compare the products of oxidation and state the similarity and difference of these polyaromatic structures. ET-A asphaltenes, compared to petroleum asphaltenes, are characterized by lower values of molecular-mass distribution (from 100 to 1200 m/z with Mmax = 400-600 m/z) [3,5]. They feature higher aromaticity (H-to-C ratio) and there are almost no heteroatoms (S, O, N), which are intrinsic to asphaltenes OIL-A (Figure 4).…”

Section: Characteristics Of Oxidizing Agentsmentioning

confidence: 99%

“…Given the growing demand for ethylene [4], expanding the efficient use of ET is of great importance from both economic and environmental aspects. It is known that ET contains a significant amount of various aromatic compounds and can be used as a raw material for the production of bi-and polycyclic hydrocarbons, as well as for the production of high added-value products [5][6][7]. The complexity of the hydrocarbon composition and the high content of technogenic asphaltenes and olefins restricts the production of new materials from ET [1][2][3][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

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Asphaltenes from Ethylene Tar as a Potential Raw Material to Obtain High Value-Added Products

Borisova,

Minzagirova,

Shabalin

et al. 2023

Energies

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Ethylene tar is the main byproduct of ethylene synthesis obtained via pyrolysis of hydrocarbon feedstock. With the growing demand for ethylene, the efficient use of ethylene tar is of great importance from both an economic and an ecological point of view. It contains significant amounts of polycyclic aromatic hydrocarbons, which can be designated as technogenic asphaltenes. Such polyaromatic structures can be isolated and used as a synthetic platform for modification and molecular engineering, similar to petroleum asphaltenes. In this study, the possibility of modifying technogenic asphaltenes by oxidizing reagents used previously for petroleum asphaltenes was shown for the first time. Technogenic asphaltenes contain significantly fewer heteroatomic structures and have a lower molecular weight compared to petroleum asphaltenes. The compositional features of technogenic asphaltenes ensure deeper oxidation with the formation of various O-containing products, whose properties can vary significantly depending on the reaction conditions. At the same time, the general patterns of oxidative modification of technogenic asphaltenes correspond to the oxidation processes of petroleum asphaltenes. The modification products obtained in this way can be used as sorbents, catalysts, fillers for polymers, adhesive additives for road bitumens, etc.

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Section: Characteristics Of Oxidizing Agentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Asphaltenes from Ethylene Tar as a Potential Raw Material to Obtain High Value-Added Products

Borisova,

Minzagirova,

Shabalin

et al. 2023

Energies

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“…Bromination-debromination is a process in which a hydrogen atom on the aliphatic side chain of an aromatic ring is replaced by a bromine radical, and then the bromine is removed in the form of hydrogen bromide at approximately 300 °C. Through this process, aromatic compounds are neatly connected through side chain bridge bonds [ 19 , 20 ]. Bromine can form bromine free radicals under light or low temperature conditions (110 °C).…”

Section: Introductionmentioning

confidence: 99%

Effects of Bromination-Dehydrobromination on the Microstructure of Isotropic Pitch Precursors for Carbon Fibers

et al. 2020

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In this work, isotropic pitch precursors are synthesized by the bromination-debromination method with ethylene bottom oil (EO) as the raw material and bromine as the initiator for pitch formation and condensation reactions. The aggregation structure, molecular weight distribution, and molecular structure of isotropic pitch precursors are characterized by thermal mechanical analyzer (TMA), MALDI TOF-MS, and 13C NMR, respectively, for revealing the mechanism of synthesis of isotropic pitch precursors. The results show that at low bromine concentrations, polycyclic aromatic hydrocarbons (PAHs) were mainly ordered in cross-linked structures by bromination-debromination through substitution reactions of side chains. The condensed reactivity can be improved by the effect of bromine, meaning that condensation reaction was aggravated by the method of bromination-dehydrobromination. In the presence of excess bromine, the cross-linked stereo structure of PAHs changed to the planar structure of condensed PAHs, which was not conducive to the subsequent spinning and preparation of carbon fibers.

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In situ 3D bacterial cellulose/nitrogen-doped graphene oxide quantum dot-based membrane fluorescent probes for aggregation-induced detection of iron ions

Zhou

Mensah

et al. 2019

Cellulose

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Preparation and characterization of high softening point and homogeneous isotropic pitches produced from distilled ethylene tar by a novel bromination method

Cited by 6 publications

References 0 publications

Asphaltenes from Ethylene Tar as a Potential Raw Material to Obtain High Value-Added Products

Asphaltenes from Ethylene Tar as a Potential Raw Material to Obtain High Value-Added Products

Effects of Bromination-Dehydrobromination on the Microstructure of Isotropic Pitch Precursors for Carbon Fibers

In situ 3D bacterial cellulose/nitrogen-doped graphene oxide quantum dot-based membrane fluorescent probes for aggregation-induced detection of iron ions

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