A reversed liquid-to-gas contact mode in the microchannel reactor can significantly improve the carbonization method for the synthesis of high-purity mesoporous pseudo-boehmite. The transfer mass details were simulated by computational fluid dynamics. The NaAlO2 droplets were surrounded by the CO2 gas flow in the microchannel, which is the key to the two-phase mixing efficiency.
Abstract
Pseudo-boehmite with a high specific surface area and large pore volume was continuously synthesized in a microchannel reactor using the carbonation method. The effects of the microchannel on the prepared pseudo-boehmite, strongly present in gas-liquid mixing efficiency, were studied. In time scale, the crystallinity of pseudo-boehmite in the microchannel, without the aging process of high-temperature stirring, reaches the standard of industrial products. Besides, the fluid and mass transfer effect of the gas-liquid mixing process in the microreactor was simulated under experimental conditions in computational fluid dynamics. The result illustrated the base-liquid surround by the acid-gas model in the microreactor, which is significantly different from the batch reactor.