Transactions . organic sulfurof the coal, and the organic sulfur content was figured by subtractingthe inorganic from the total sulfur. The main source of error in thisprocedure lies in the fact that most coals contain appreciable amounts <Zeit. Angew. Chem. (1899), 764. ^ Chem. Eny (1910) 11, 27. ^ Archil. Phar. (1882) 38. ^Chem. News (1878) 38, 147. 676 FORMS IN WHICH SULFUR OCCURS IN COAL of iron silicate, which on calculating the equivalent sulfur to FeS2 givesa high factor for that constituent. In attempting to secure a direct factor for organic sulfur, the phenolsoluble material was f
Transactions . organic sulfurof the coal, and the organic sulfur content was figured by subtractingthe inorganic from the total sulfur. The main source of error in thisprocedure lies in the fact that most coals contain appreciable amounts <Zeit. Angew. Chem. (1899), 764. ^ Chem. Eny (1910) 11, 27. ^ Archil. Phar. (1882) 38. ^Chem. News (1878) 38, 147. 676 FORMS IN WHICH SULFUR OCCURS IN COAL of iron silicate, which on calculating the equivalent sulfur to FeS2 givesa high factor for that constituent. In attempting to secure a direct factor for organic sulfur, the phenolsoluble material was first studied. The apparatus used for the phenolextraction is shown in Fig. 1. The heating medium was an electric ovenconstructed as shown. The coils of nichrome wire were % in. ( mm.)in diameter and were wound around the iron cyHnder in a spiral fashion;50 ft. (15 m.) of No. 20 wire were used. The extraction was carried onin Erlenmeyer flasks fitted with long glass tubes that extended Air Condensers. Asbestos BoardIron CylinderAsbestos Paper Fire-clay WaterGless Coils of Nichrome Extraction FlasksContcining Coaland t-henol -Asbestos Board Asbestos-MagnesiaInsulation Material KiG. 1.—Cross-section of electric furnace used in phenol extraction of• coal. outside the oven to act as condensers for the phenol vapors. Themethod of procedure was to place 3^^ gm. of the coal in the flask, pour overit 25 of phenol, and maintain the oven at a temperature of 140°.The extraction was continued for 20 hr., when the contents of each flaskwas filtered through a Gooch crucible while still hot. Every particleof residue was rinsed out of the flask by means of alcohol and residue in the Gooch crucible was dried, mixed with sodium peroxide,and ignited in a nickel crucible. The solution obtained from this fusionwas analyzed for sulfur by the regular sulfate method. By subtractingthe sulfur found in this residue from the total sulfur, the phenol solublesulfur was indica
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
