Bituminous coals analyses

A sample of medium-grade bituminous coal analysis is as follows ... 

Fuel high volatile bituminous coal, analysis given in Table II (A) Two-Stage Coal Pyrolysis-Gasification Process... 

Analysis Pure ceUulos e Pine wood Kentuck y bluegrass Giant brown kelp Feedlo t manur e Urban refuse Primary sewage sludge Reed sedge peat Illinois bituminous coal... 

For each coal, at the maximum in hydrogen content, or H/C atomic ratio, the aliphatic hydrogen content (determined by H NMR analysis) accounted for over 90% of the total hydrogen. The aliphatic hydrogen contents were 10.5% for the subbituminous coal,PSOC-1403, and 6.9% for the bituminous coal, PSOC-1266. The high aliphatic hydrogen content was associated with the presence of polymethylene chains. The early release of paraffinic material, as n-alkanes and as long chain substituents to aromatic structures, under conditions of mild pyrolysis has been observed in other research (13-15. ... 

By applying this analysis at discrete 10 K temperature intervals to the NMR thermal analysis data for the 102 coals (subdivided into brown coals (<75% C), lower rank (80-85% C) and higher rank (85-90% C) bituminous coals), regression coefficients could be obtained as functions of temperature and hence the average 2T of the three maceral groups were generated (Figures 3-... 

Berry, W.F. Cole, D.L. Preparation and Polishing of Coal and Coke for Petrographic Analysis. Bituminous Coal Research Inc., Pennsylvania, 1965. 

Bituminous Coala.—Bituminous coal bears a general resemblance to the last, inasmuch as both contain the same substances, varying in. relative quantity. Analysis, however, cannot always determine between them, ai,d the physical marks noted in the preceding pages must be observed narrowly before deciding. For the most part, the density of bituminous coal is greater than that... 

Most of the analyses of Antarctic coal were based on blocks of transportable size taken from surface outcrops. In earlier work, sections of purer coal were cut from the blocks and submitted for analysis. In later work, selected blocks were crushed, and a float fraction of purer coal was submitted to provide analytic data from each deposit. These samples, while not useful for determining coal grade, may be adequate for indicating rank. Practically all of the Antarctic coal, with the exception of that at Amery (which may represent high volatile bituminous coal), corresponds to medium volatile bituminous or higher rank. The high apparent rank Antarctic coal may be classified according to conventional ASTM standards of rank based on proximate analysis, but it seems clear that these results serve only as a first approximation. 

Samples Preparation. The coal liquids were derived from the catalytic liquefaction of Pittsburgh Seam bituminous and Wyoming sub-bituminous coals. The analysis of these coals is given in Table I. The coals were liquefied in a bench-scale catalytic unit using cyclone overhead product as recycle solvent to insure that the liquid products were derived from the coal and not the solvent. The product streams from... 

Direct Characterization Techniques. The in situ analysis of elemental composition of coals by ion microprobe was first demonstrated by Dutcher t al. (85). Raymond (86) has applied this technique to examine the variation in composition of coal macerals which has been especially effective for looking at sulfur distribution. An example of the organic sulfur distribution for two bituminous coals is shown in Table II which is taken from reference (86). Note that the liptinites contain the... 

Raman Analysis of Gasoline from Bituminous Coal... 

An exergy analysis of the conceptual design of the synclude mode H-Coal process for bituminous coal of Illinois No.6 has been carried out based on the data reported by the Fluor Engineers and Constructors, Inc.,(31). The plant is designed to convert 14,448 tons (short ton) of coal per day. 

In lignites, the probably small extent of crosslinking should eliminate the need for correction. However this correction may be important in bituminous coals and anthracites where cross-linking could be extensive. Actually, the effect of "bulky" crosslinks should be included in the non-Gaussian model analysis... 

The objective of this communication is to report structural information on a bituminous coal from a thorough characterization of its extracts. The characterization was carried out according to a scheme devised on the basis of our current understanding of coal chemistry. The scheme consists of considerations in preparation, fractionation, and analysis of coal-derived liquids (CDL) to obtain molecular-level information on the CDL per se as well as on the parent coal. The information obtained relates mostly to the structure of component clusters. 

A high-ash sub-bituminous coal, Butia-Brazil, was used in the experiments, being its proximate and ultimate analysis given in Table 1. 

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