Bruceton coal

The composition of the three coal samples studied is shown in Table I. All were high volatile (HVA-type) bituminous coals. The composition of the Bruceton coal was very similar to that of the coal which was used in earlier... 

The infrared spectra of the coal and the various extracts were recorded on a Baird, Model GY-1 (Ireland Mine vitrain concentrate) and on a Perkin Elmer Model 337 spectrophotometer (Bruceton coal). The samples were prepared by the potassium bromide pellet technique. The high resolution proton NMR spectrum of the benzene soluble extract from Ireland Mine vitrain concentrate was recorded on a Varian A-60 spectrometer in 10% deuterated chloroform (CDCh) solution, using tetrametnylsilane internal standard. 

Table III. Elemental Analysis of Products from Phenanthrene Extraction of Bruceton Coal ...

The extract yields are shown in Table II. More than 90% of the organic coal substance was dissolved in the extraction of Ireland Mine vitrain concentrate and about 85% in the case of Bruceton coal. The yield of the phenanthrene soluble fraction was not determined in the extraction of Ireland Mine coal. In that run the products were worked up with a different procedure, and the phenanthrene soluble and phenanthrene insoluble fractions were not separated. 

The elemental analyses of the products from the extraction of Bruceton coal are shown in Table III. The mineral matter was separated from the extract quite efficiently as shown by the ash content of the extracts and the insoluble residue. The elemental composition of all fractions was quite similar to that of the original coal. Only the hydrogen content varied to some extent, increasing with increased solubility. The elemental analysis of the products from the extraction of Ireland Mine coal was incomplete. 

Figure 2. Infrared spectra of (A) Bruceton coal, (B) benzene soluble fraction, (C) pnenanthrene soluble fraction...

Discussion. Experiments were carried out with Bruceton coal and toluene at supercritical toluene densities in the range of 0.157-0.601 g/cc. The temperature range studied was 647-698 K and the reaction time was varied from two minutes to 60 minutes. The experimental results are explained by a kinetic model, the details of which can be found elsewhere (16). 

Two further observations supported this interpretation. The first was the NMR spectrum of octanoylated Bruceton coal shown in Figure 2. The peaks in the octanoyl group were assigned by analogy... 

Figure 1. NMR spectrum of octanoylated Bruceton coal in CDCl ...

Bruceton coal was depolymerized in refluxing phenol using p-toluenesulfonic acid (HOTs) catalyst (29). The products were 91% extractable into pyridine and had a number average molecular weight of 400 in pyridine, measured by vapor pressure osmometry. Yet most of the materials in this solution have molecular weights above 2500. 

Figure 4. Apparent M for true pyridine solubles from depolymerizea Bruceton coal (29)...

Figure 9. Comparison of inverse gas chromatography data from the Bruceton coal with microdilatometer measurements of a coal from the same seam (data from ref. 24).

Table IV. Effect of Pressure on Gasification of Bruceton Coal Using Pretreater and Gasifier in Series...

Test conditions, unit A charge, 10 grams pretreated Bruceton coal, 0.5 gram catalyst ... 

Gasification conditions charge, 70 grams pretreated Bruceton coal, 3.5 grams... 

Pretreated Bruceton Coal and of Residues from Total Gasification ... 

Figure 2. DRIFT spectra. Key A, Bruceton coal B, kaolin in KCl (2.0%) and C, difference spectrum (A — 0,7404 y B).

Larsen, J.W. and P. Chaudhury. Molecular Weight of Denoly-merized Bruceton Coal." J. Org. Chem. 44 (1979) 2656. 

Larsen, J.W. Kennard, L., and Kuemmerle, E.W., Thermodynamics of adsorption of organic compounds on the surface of Bruceton coal measured by gas chromatography. Fuel, 57(5), 309-313 (1978). 

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