Method and device for separating surfactant from dilute solution

Abstract

The invention discloses a method and a device for separating surfactant from dilute solution. A raw material tank filled with dilute solution containing surfactant is connected from the bottom of a vertically arranged tubular membrane module via a solution pump, a first valve and a liquid flowmeter; a compressor is also connected from the bottom of the vertically arranged tubular membrane module via a second valve and a gas flowmeter; the top part of the vertically arranged tubular membrane module is connected to a foam collecting groove via a third valve; the middle part of the vertically arranged tubular membrane module is connected with a liquid storage tank. The adoption of the membrane and foam separation inner coupling method can reduce the concentration polarization of the membranesurface effectively, reduce membrane pollution, prolong the service life of the membrane, and simultaneously can eliminate back mixing phenomenon in the membrane and foam separation process, improve mass transfer rate of membrane and foam separation, and achieve separation efficiency. The rejection of the surfactant is 64.9% to 99.9%, thus saving more energy.

Description

technical field [0001] The invention relates to a separation method and device for surface active substances in dilute solution. Background technique [0002] Foam separation is an energy-saving and environmentally friendly separation technology that can be used to recover (or remove) surface-active substances in dilute solutions, or other substances that can combine with surface-active substances. However, the back-mixing phenomenon in the foam column seriously affects the efficiency of foam separation. At the same time, with the progress of the separation process, the concentration of surface active substances in the bulk phase decreases, and the driving force for mass transfer decreases, resulting in a decrease in separation efficiency. [0003] Membrane separation technology is also an energy-saving and environmentally friendly separation technology, but the main disadvantages in the membrane separation process are concentration polarization and membrane pollution. [...

AI Technical Summary

Problems solved by technology

However, the back-mixing phenomenon in the foam column seriously affects the efficiency of foam separation.

At the same time, as the separation process progresses, the concentration of surface active substances in the bulk phase decreases, and the driving force for mass transfer decreases, resulting in a decrease in separation efficiency.

[0003] Membrane separation technology is also an energy-saving and environmentally friendly separation technology, but the main disadvantages in the membrane separation process are concentration polarization and membrane pollution.

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