外循环撞击流反应器微观混合性能研究

Performance of micromixing in exterior circulative impinging stream reactor

在有效容积为160 L的外循环撞击流反应器(ECISR)内,以酸碱中和与氯乙酸乙酯水解的平行竞争反应为工作体系,对反应器内微观混合性能进行了研究,考察了不同的进料时间、进料位置、循环流量对该平行竞争反应副产物分布的影响,通过副产物收率即离集指数X Q的变化来表征微观混合的效果。研究结果表明:撞击区上部(400mm)进料微观混合效果最好,反应器顶部最差;当进料位置和循环流量不变时,进料时间达40 min以上,X Q不再随进料时间的延长而降低;循环流量达到6 000 L/h时,微观混合效果最佳,再升高循环流量微观混合提升已不明显。

The micromixing performance of impinging stream from an exterior circulative impinging stream reactor （ECISR） with 160 L effective capacity was studied. A pair of competitive parallel reactions was used to investigate the micromixing performance in the ECISR. The factors of machinery of feed-in time, feed-in position, circulative flux affecting the micromixing of ECISR were studied. A simplified distortion-diffuseness model was applied to take the product distribution of parallel reaction. The result indicates that the micromixing is promoted effectively in the impingement zone, and the top of the impingement zone is the best feed-in position while the top of the reactor is the worst; the increasing in feed-in time promotes micromixing while the feed-in position and circulative position are changeless, but micromixing becomes steady while feed-in time up to 40 rain. The influence of macromixing is dispelled while using this critical value as the feed-in time. The performance of micromixing is promoted obviously along with the increasing in circulative flux, but the change of by-product distribution is not distinct when the circulative fluxes rise up to 6 000 L/h.