Abstract
PYRIDINE has long been known as a good solvent for coal1. It is effective even at room temperature, and causes marked swelling of the coal substance. Solutions are usually prepared at the boiling point and are recognized to be at least predominantly colloidal. It has recently been found that ethylene diamine is a more rapid and in some respects more powerful solvent, its action being similar in many ways to that of pyridine. A preliminary survey has been made of its interaction with coals. As with pyridine2, the action of ethylene diamine is retarded by the presence of moisture; commercial diamine containing 40 per cent water has very little effect at room temperature. The solvent used in this work contained less than 1 per cent water.
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