In the preparation of practically all chemicals there is the necessity of drying, either of the final product or of one or more of the materials used in its preparation. If the material is in solution, or in a suspension, it can be easily handled by drying upon the surface of an internally heated drum. Continuous sheets such as paper and cloth are also dried this way. If the material is easily damaged by high temperatures it may be dried under a partial vacuum. Considering their adaptability, ease of operation, and relative efficiency of operation, it is not surprising that the drum driers are extensively used... / Master of Science