Analysis of coal liquids

Analysis of Coal Liquids by Size Exclusion Chromatography—Gas Chromatography—Mass Spectrometry... 

Kershaw, J. R. 1989. In Spectroscopic Analysis of Coal Liquids. Elsevier, Amsterdam, Chap. 8. 

Table IV Ultimate Analysis of Coal Liquids and the fractions separated by liquid sulfur dioxide...

Table I. Weight Distribution and Ultimate Analysis of Coal-Liquid Fractions"...

Attalla, M.L, Vassallo, A.M., and Wilson, M.A. 1989. In Spectroscopic Analysis of Coal Liquids, J. Kershaw (Ed.). Elsevier, Amsterdam, the Netherlands, Chapter 7. 

The same authors applied this system to the analysis of coal liquids, using pyridine as solvent. 

Taking advantage of its high separation strength, a combination of SEC with MS enhances the capability of MS and makes it possible for the analysis of coal liquids. SEC can be used as a coal liquid sample pretreatment method prior to GC-MS. For SEC, 1-methyl-2-pyrrolidinone (NMP) is often used as eluent. Analytical result for a coal liquefaction extract sample prepared from SEC by GC-MS showed that only the pentane-soluble components could be analyzed [16] the larger aromatic molecules identified by SEC to be present were lost in the GC column. The molecular weight of the aromatics analyzed in the coal liquids were up to 352 with very few aliphatics. 

Using microbore LC columns, a separation method was developed for a series of weakly basic cyclic and noncyclic secondary amines, which were identified as components of coal-derived solvents. As shown in another study, using normal HPLC on silica gel with Freon-113 elution, model mixtures of aliphatic and aromatic hydrocarbons and nonpolar constituents can be separated in coal-liquefaction process solvents. Encouraging results were obtained on both semipreparative (4.6 mm i.d.) and microbore (1 mm i.d.) columns. According to further reports, carbamate pesticides, polymer additives and solvent-refined coal were analysed, and the components of bergamot oil can be identified. GPC/FT-IR can be used to detect components of cold-rolling oil and to analyse polymers, whereas SEC/FT-IR can be applied to the analysis of coal liquids and to improve detection and identification of proteins. 

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