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Hydroxyl functional groups present in oxygenated hydrocarbons play an important role in determining the mechanistic routes and the extent of reaction of supercritical water decomposition. To examine the effect hydroxyl groups have on supercritical water reactions, kinetic experiments were performed using isopropanol, propylene glycol, and glycerin; e.g., monohydric, dihydric, and trihydric alcohols of C 3  hydrocarbons. The experiments used a Haynes® Alloy 282 reactor system and were conducted at temperatures from 550°C to 650°C at a pressure of 24.13 MPa and reactor space time of 45 seconds. Based on a thorough analysis of carbon gasification, gaseous effluent compositions, and liquid effluent compositions, the mechanisms for supercritical water decomposition and the impact of hydroxyl groups on those reaction mechanisms were elucidated.

Mechanistic Roles of Hydroxyl Group in the Supercritical Water Reaction of Polyhydric Alcohols