Effects of Preheater Residence Time on the Rheology of SRC-I Slurries under Preheater Conditions. Final Report

摘要

Studies were made on SRC-I feed slurries under preheater conditions to determine the effects of residence times at or above 500 K on the rheological properties of the slurry. Measurements were taken at 17.3 MPa pressure, at reaction times from 15 to 120 s, and at temperatures from 450 to 644 K. Results show that an increase in residence time from 15 to 45 s results in a decrease in apparent viscosity by about 50% at 589 K. The experiments also revealed that after relatively short reaction times (2 min) without hydrogen pressure, the products exhibit fairly low viscosity. At reaction times less than 2 min, the viscosity changes rapidly with reaction time at the temperatures examined. The results demonstrate that rheological data under preheater conditions must be taken carefully at a constant residence time in order to avoid reaction-time effects as the shear rate is changed. (ERA citation 08:055387)