Wyodak analyses

The analysis of Wyodak recycle solvent by SEC-GC-MS shows that certain distribution order exists for species in coal liquids with respect to their size and degree of isomerization. The alkanes increase in chain lengths without any appreciable degree of isomerization, except for some biological markers such as pristane and phytane. Phenols and aromatics vary in size and extent of isomerization which causes the liquid to contain a large number of species. 

Gaschromatograph Analysis of SEC Fractions of Wyodak Recycle Solvent... 

Figure 1. Chromatographic observations for pristine and exposed samples of low sulfur Wyodak coal. Elemental sulfur emerges at 38.3 minutes under the conditions of the analysis. A. Unconcentrated extract of APCSP-2. B. The extract of APCSP-2 after 20-fold concentration. C. Unconcentrated extract of exposed Wyodak coal. D. The same extract after 20-fold concentration. (Adapted with permission from ref. 6. Copyright 1985 Fuel.)...

The elemental analysis and heating value of the selected Wyodak coal is given in Table 1. 

Table 1. Wyodak coal analysis for this study...

Figure 3. Comparison of conversion of MAF Wyodak (—035 solvent (A/ —0/9 solvent (0)) and Monterey (—035 solvent (O) —019 solvent ( Z )) coals to pyridine solubles (based on ash analysis)...

The SRC s used in this study were obtained from the SRC process demonstration unit operated by Southern Services Inc. in Wilsonville, Alabama. Three SRC s were studied and these products were derived from the following coals Illinois No. 6 Burning Star, Illinois No. 6 Monterey, and Wyodak (Amax). The as-received SRC s were wet owing to a water quench and therefore each SRC was dried carefully before sampling and analysis. The vacuum resid was prepared by laboratory vacuum distillation of an atmospheric resid obtained from a commercial refinery source. The identification and source of the coal liquid samples used in this study along with other pertinent information are presented in Table I. 

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