Partition wall double-layer plate type circular-flow extraction tower and extraction method

Abstract

The invention discloses a partition wall double-layer plate type circular-flow extraction tower and an extraction method. Tower plates of the extraction tower are composed of distribution plates and dual flow plates; the distribution plates are partitioned from the dual flow plates through a central partition plate. The extraction tower is divided into a front mass transfer area and a rear mass transfer area through the central partition plate; the distribution plates and the dual flow plates in each mass transfer area are arranged alternately from top to bottom; every two adjacent distribution plates in the same area form a mass transfer unit. The distribution plate and the dual flow plate of the same tower plate are communicated through an arc-shaped communicating pipe. Continuous phase fluid flows circularly step by step alternately in all the mass transfer units of the two mass transfer areas through the communicating pipes. Dispersion phase fluid is divided into two equal parts, and the two parts of the dispersion phase fluid and the continuous phase fluid are subjected to step-by-step cross flow in the two mass transfer areas respectively and are in contact for mass transfer. The continuous phase fluid is dependent on the same-direction flow effect of the adjacent mass transfer units; the dispersion phase fluid is dependent on aggregation and dispersion of the distribution plates and the interface updating effect of the dual flow plates, so that liquid-liquid extraction achieves the high mass transfer rate and separation efficiency, it is beneficial to the extraction process with the flow rates of two phases differing greatly and the low flow rate serving as the continuous phase.

Description

technical field [0001] The invention relates to an extraction tower structure and an extraction method, in particular to provide a double-walled double-wall plate circulation extraction tower and an extraction method for the multi-stage countercurrent extraction process in chemical production. Background technique [0002] In the field of chemical separation, sieve tray column is often selected for liquid-liquid continuous countercurrent extraction process. In addition to reducing the axial back-mixing effect of the continuous phase, the sieve plate column can also be designed to be suitable for liquid-liquid extraction systems with large changes in density and flow ratio by adjusting the plate spacing and opening ratio. Therefore, in some specific In the extraction process, the sieve tray column has more advantages than the packed column. [0003] The tray efficiency of the conventional sieve tray extraction tower is generally not high. First, the residence time distributi...

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Problems solved by technology

[0003] The tray efficiency of the conventional sieve tray extraction tower is generally not high. First, the residence time distribution of the continuous phase flow on the tray is very uneven, resulting in serious radial back-mixing and a decrease in the overall mass transfer driving force; second, the aggregation of the dispersed phase For larger droplets, the phase boundary area is greatly reduced, resulting in a decrease in mass transfer rate

Especially for the extraction process with a small flow rate as the continuous phase, with the increase of the tower diameter, the uneven distribution of the flow velocity on the tray becomes more and more serious, and the phase boundary area at different positions also varies greatly, and the overall separation capacity of the tray Greatly reduced

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