Separation and Characterization of Olefin/Paraffin in Coal Tar and Petroleum Coker Oil

Abstract

We have investigated and established a preparative method of using a solid-phase extraction cartridge containing Ag + -exchange resin (Ag + -SPE) for separating olefins and paraffins in the saturate fractions of coal tar and petroleum coker oil. The successful separation of paraffins and olefins was confirmed by gas chromatography coupled with mass spectrometry (GC− MS). Proton nuclear magnetic resonance ( 1 H NMR) spectroscopy was applied to determine the olefin structures for olefin-type distributions. None or negligible amounts of iso-α-olefins were detected by 1 H NMR in the coal tar but were found significant in the coker oil. Gas chromatography coupled field ionization time-of-flight mass spectrometry (GC−FI-TOF MS) was employed to determine the molecular distribution of paraffins and olefins. With separate paraffin and olefin fractions, the differentiation between isomers, such as monocycloparaffins versus monoolefins, can be made.

Linear α-olefin production with Na-promoted Fe–Zn catalysts via Fischer–Tropsch synthesis

“…, and iso-a-olen (d $ 4.6-4.8), and the composition was calculated as previously reported by Ni et al 38 The amount of oxygenates in the aqueous phase was determined using an organic elemental analyzer (FLASH EA-200, Thermo Scientic).…”

Deep Eutectic Solvents As Tuning Media Dissolving Cu+ Used in Facilitated Transport Supported Liquid Membrane for Ethylene/Ethane Separation

“…Light olefins are primarily produced via the pyrolysis or catalytic cracking of the crude oil component, such as naphtha and gas oil. In addition, a significant amount of the light olefins produced during the refining of crude oil is used as refinery fuel. , Among the mentioned process, the olefins usually exists as the olefins/parraffins mixtures, so the separation technology is critical to enhance the utilization efficiency of light olefins. − Unfortunately, because of the low boiling points and the close relative volatilities of the light olefin and paraffin species, especially with the similar carbon numbers, traditional cryogenic distillation technology requires huge capital and energy cost, such as the very low operational temperature and the numerous trays …”

Separation and Molecular Characterization of Ketones in a Low-Temperature Coal Tar

“…The properties and molecular composition of this sample have been well-characterized previously, and ketones were found to be abundant in a subfraction of the neutral fraction. 2,13,45,46 In this study, the neutral fraction of the coal tar was obtained by acid/ basic liquid extraction, which has been described elsewhere, 46 and used to separate ketones. The yield of the neutral fraction is 69.9 wt % of the total coal tar.…”

“…Meanwhile, LTCT could also be used to produce chemicals, for example, to separate phenols. The composition of LTCT is extremely complex: it consists of thousands of hydrocarbons and heteroatom compounds, including aliphatic − and aromatic , hydrocarbons, phenols, − nitrogen compounds, − etc. Oxygen-containing compounds, such as phenolic compounds, are much more abundant in LTCT than petroleum and high-temperature coal tars.…”