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

Size matters: asphaltenes with enlarged aromatic cores promote heat transfer in organic phase-change materials

“…It is noteworthy that the ASP2 molecule resembles the structure of so-called “technogenic” asphaltenes isolated from ethylene tar samples in ref. 16 and 28. The aliphatic periphery of this molecule consists of several methyl and ethyl groups, so that the ASP2 molecular weight amounts to about 500 g mol −1 in accordance with a peak molecular weight value observed through the matrix assisted laser desorption/ionization (MALDI) spectroscopy for the most probable “technogenic” asphaltene molecules considered in ref.…”

Conformational Analysis of Nonplanar Archipelago Structures on a Cu (111) Surface by Molecular Imaging

“…Direct evidences on the nature and presence of linkers have also been found from other studies. − Mass spectrometric studies, especially tandem MS (MS/MS) methods, such as collision-induced dissociation (CID) or infrared multiphoton dissociation (IRMPD) techniques, suggested the existence of linkages in petroleum asphaltene molecules. − A loss of carbons concurrent with a decrease in double-bond equivalence (DBE) is suggestive of multiple aromatic core structures, while the loss of carbons without a decrease in DBE would suggest a single-core structure . The potential nature of the linker was tackled by the pioneering works of Strausz, who identified potential sulfidic linkages (R–S–S–R, R–S–R) in asphaltene molecules by chemical analysis. , Flash pyrolysis studies demonstrated that a significant amount (∼35 wt %) of lighter components composed of aromatic molecules could be formed and was taken as strong evidence for the archipelago structure. , Furthermore, a later study showed that archipelagos can be formed during thermal cracking process, further complicating data interpretation .…”

Modified Technogenic Asphaltenes as Enhancers of the Thermal Conductivity of Paraffin

“…As an alternative to petroleum asphaltenes, their analogues, technogenic asphaltenes, which were isolated from ethylene tar (ET), a waste product of ethylene production by pyrolysis of hydrocarbon raw materials [ 21 , 22 ], are considered in this paper. Currently, ET is being investigated as a raw material for the synthesis of pitch precursors for various carbon materials, including general purpose carbon fiber [ 22 , 23 , 24 ] and carbon nanofiber [ 25 ]. However, on an industrial scale, ET is used mainly for the production of carbon black or as a component of boiler fuel.…”