In this work, a loop micro pipeline system is proposed for continuous extraction and recovery of phenol in aqueous phase through the circulation of organic phase. There are two flow patterns of two phases in whole pipeline: Segmented flow and Stratified flow. Phenol extraction and stripping processes are conducted through the pattern of segmented flow in the micro pipe, and then organic and aqueous phases are separated by their stratified flow in the expanded pipe. The circular flow of organic phase in the pipeline system plays a role as carrier to extract phenol from feed phase and discharge it into stripping phase continuously. The results show that the extraction and stripping processes only need 19 seconds respectively in the micro pipe when the flow rate is 3.0 mL/min, and the recovery efficiency of phenol reaches up to 94 %. In addition, mass transfer efficiency of two phases could be improved by the flowing of helical-coiled path. It is expected that such a micro pipeline system has potential for practical application in the recovery of phenol from aqueous solution.

在这项工作中，提出了一种循环微管道系统，通过有机相的循环连续提取和回收水相中的苯酚。整个管道有两个阶段的两种流动模式：分段流动和分层流动。苯酚萃取和汽提过程通过微管中的分段流动模式进行，然后有机相和水相在膨胀管中通过它们的分层流动进行分离。管道系统中有机相的循环流动起到载体的作用，从进料相中提取苯酚，并将其连续排入汽提相。结果表明，当流速为3.0 mL/min时，萃取和汽提过程在微管中分别只需要19秒，苯酚的回收率高达94%。此外，螺旋盘绕路径的流动可以提高两相的传质效率。预计这种微型管道系统在从水溶液中回收苯酚方面具有实际应用的潜力。