Abstract
1. The catalytic activity of tricalcium phosphate in the vapor-phase hydration of propylene oxide to propylene glycol was studied. 2. Calcium phosphate is a stable and selective catalyst for this reaction. 3. The effect of temperature, contact time, and water excess on the glycol yield was studied. Considerable amounts of glycol were formed under the optimal conditions and the glycol yield reached 50–57% at 232°, for example similar results were obtained in the hydration of ethylene oxide. 4. The high specificity of the phosphate catalyst in the hydration of propylene oxide is in accord with the fact that it hardly catalyzes the isomerization of oxide to allyl alcohol and propionaldehyde. 5. The reaction mechanism is discussed.
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