Characterization and Pyrolysis Behavior of Novel Anthracene Oil Derivatives

Abstract

The characterization and pyrolysis behavior of a set of pitches prepared from anthracene oil have been described. The pitches were obtained from four successive cycles of a sequential process that begins with blowing air through the heated anthracene oil, to bring about recombination reactions. Reaction products are distilled to give a pitch residue and a lighter fraction. Thermal treatment/distillation cycles of this reaction product yield a pitch and a distillate fraction (unreacted anthracene oil) during each subsequent stage. Products obtained during the process have been characterized by elemental analysis, Fourier transform infrared (FTIR) and ultraviolet (UV)-fluorescence spectroscopy, and size-exclusion chromatography (SEC). The pyrolytic behavior of the anthracene oil derivatives was examined using a thermogravimetric balance. Thermal treatment of the anthracene oil and its (distilled) reaction products at 440−460 °C under 5 bar pressure leads to a partially anisotropic pitch with the formation of a liquid crystal phase (mesophase). The formation and evolution of these mesophases were analyzed by optical microscopy.

The effect of the parent graphite on the structure of graphene oxide

“…Two cokes of different optical texture (mosaics and flow domains) obtained from two synthetic pitches prepared from the same coal fraction at different conditions [12] were ground in an agate ball mill at 400 rpm for 1 h, and then sieved through a 0.75 μm mesh. The resultant powders from each coke were graphitized at 2800 °C in a graphite furnace for 45 min under argon flow to provide two graphites, G1 and G2.…”

Elucidating transfer hydrogenation mechanisms in non-catalytic lignin depolymerization

“…Further evidence of the importance of the benzylic position and oxygen in condensation reactions comes from research on the production of synthetic pitches from coal tar derived anthracene oil. 31,40,41 In that work anthracene oil was air blown at 280-300 C in the presence of an iron chloride catalyst. It was found that the incorporation of oxygen groups into aromatic side chains of the anthracene oil molecules was important for improving the yield of higher mass compounds (500 to >3000 amu) compared to nitrogen blown conditions.…”

Characterisation and feasibility as carbon fibre precursors of isotropic pitches derived from anthracene oil

“…In samples with large polydispersity like these pitches, signal from higher molecular weight materials is overshadowed by that of the more abundant lighter species. Fractionation allows then a more accurate determination of the range of molecular weights present in the sample [6].…”

“…However, the use of traditional fibres, e.g., PAN-based carbon fibres, for these applications is not possible due to both their low volume of production and prohibitive cost. The use of synthetic pitches from a low cost carbon-rich source such as anthracene oil has been proposed as an alternative for the production of this kind of fibres [6].…”