关键词: 微孔射流, 毛细管反应器, 液液传质, 液液反应选择性

Abstract: Microreaction technology has been widely used in the field of chemical process intensification, especially for fast and complicated competitive reaction systems. For liquid-liquid biphase fast competitive reactions, the reaction process is controlled by mass transfer property, which significantly affects the reaction conversion and yield. In this paper, a new type of micropore-jet capillary microreactor (MJCM) was developed to intensify liquid-liquid biphase mass transfer property at the inlet. Liquid-liquid biphase mass transfer property and reaction selectivity were studied under different experimental conditions (flowrate, flux ratio, surfactant concentration, temperature) and structure parameters (pore size, capillary length), adopting respectively the water-benzoic acid-kerosene system and the water-NaOH-toluene-benzoic acid-ethyl chloroacetate system. Meanwhile, the correlation of Sh was obtained. The results indicate that the mass transfer efficiency (E) decreases, the overall volumetric mass transfer coefficient (KLa) increases, while reaction selectivity index (Xs) first decreases then increases, as the flow rates of two immiscible liquid phases rise. Both liquid–liquid mass transfer and reaction selectivity weaken under larger pore size. Increasing the capillary length results in the increase of E and Xs but decrease of KLa. The volumetric flux ratio of the aqueous phase to the organic phase affects E and KLa in different tendency. Moderate rise of temperature can improve the reaction selectivity. Adding the surfactant can decrease mass transfer property and reaction selectivity. Comparing with other liquid-liquid mass transfer devices, MJCM shows excellent performance on mass transfer property and reaction selectivity, with promising applications in industrial productions to intensify liquid-liquid mass transfer and reaction processes.

Key words: micropore-jet, capillary reactor, liquid–liquid mass transfer, liquid–liquid reaction selectivity