Separation And Analysis Of Light Components From Coal Tar

On the basis of composition analysis for light component of petroleum ester extractionsfrom high temperature coal tar (L-HTCT) and low temperature coal tar (LTCT), a variety ofmethods were used to separate the samples. High-pressure preparative liquid chromatography(HPLC) and medium-pressure preparative liquid chromatography (MPLC) were used toseparate the L-HTCT. MPLC, spinning band distillation, and double-solvent were used toseparate the LTCT. All the fractions obtained by separation were analysised by gaschromatography-mass spectrometry (GC-MS).Using petroleum ether: ethyl acetate=95:5, and methanol as mobile phase, HPLC wasadopted to separate L-HTCT. The result showed that HPLC could separate the L-HTCT intogroup components, such as aliphatic hydrocarbons, aromatic hydrocarbons, carbazole andindole nitrogen-substituted compounds. Using petroleum ether, ethyl acetate, and methanol asmobile phase, MPLC was adopted to separate L-HTCT. Aliphatic hydrocarbons, aromatichydrocarbons, and nitrogen-substituted heterocyclic compounds were enriched, includingrelatively pure naphthalene (93.8%), and series of aliphatic hydrocarbons and polycyclicaromatic hydrocarbons. The methods were effective to the separation of L-HTCT.Using petroleum ether, ethyl acetate, and methanol as mobile phase, MPLC was adoptedto separate LTCT. The result showed that MPLC could separate the LTCT into groupcomponents, such as aliphatic hydrocarbons, aromatic hydrocarbons, phenols, andnitrogen-substituted compounds. We used a spinning band distillation separation technology toseparate the LTCT. LTCT was cut into170-230oC,230-270oC,270-300oC,300-350oC, and350-380oC five fractions of different temperature ranges according to the boiling point.Phenols were mainly concentrated in ELX1and ELX2, and the content are71.1%and37.0%,respectively. Double-solvent was used to separate the LTCT. We found that phenols wereenriched in directional phase extraction by GC-MS analysis.This article offers a variety of effective methods to separate light components of coal tar.By comparing the separation of different methods, it provides a reference for industrialproduction. It also offers a variety of possibilities for the follow-up study of this subject.