The thermal behavior of kaolinite was studied by electron microscropy and X-ray diffraction. This study has shown that hexagonal-shaped particles persist far above the dehydration temperature of kaolinite., It was concluded that two stages of reaction represent the steps in the firing of kaolinite. First, the chemically combined water is removed, resulting in the formation of a uniquely organized, noncrystalline compound. Second, the noncrystalline compound collapses into crystalline mullite nuclei which exhibit normal growth,

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air under rather extreme conditions of sulfur content and times of standing.The routine use of this acidic-type solvent is recommended only for mercaptan samples known to contain a relatively large amount of elemental sulfur. For samples containing little or no elemental sulfur the regular titration solvent may be satisfactorily used. In fact, the use of the more basic solvent is mandatory when it is desired to determine both hydrogen sulfide and mercaptans on a sample which does not contain elemental sulfur. It is recommended that a nitrogen blanket be used with both solvents as a precautionary measure.In the experimental studies there were indications that the initial product of the reaction of elemental sulfur and mercaptan sulfur was the monoalkyl disulfide ion, (RSS)-, which decomposed to the sulfide ion on standing.Additional standing time in presence of excess elemental sulfur promoted the formation of inorganic polysulfides.In studies showing the effect of the organic substituent groups of the mercaptan it was indicated that phenyl, n-butyl, and ferf-butyl groups tended to form decreasing amounts of inorganic polysulfides in that order. ACKNOWLEDGMENTThe authors wish to thank Marjorie T. Walker for her very capable technical assistance in carrying out the experimental work and the Humble Oil & Refining Co. for permission to publish this paper.

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