The Behavioral Study For Enhancing The Foam Phase Drainage Of Inclined Foam Column

The inclined foam column (IFC) was adopted for enhancing the foam phase drainage. The vertical foam column (VFC) was used as the contxastive column. The ionic surfactants cetyl trimethyl ammonium bromide (CTAB) and sodium dodecyl sulfate (SDS), the protein surfactants bovine serum albumin (BSA) and whey soy proteins (WSP) were used as the model aqueous solution. The effects of the IFC on foam separation efficiency were studied. Furthermore, the behavior of the IFC in enhancing the foam, phase drainage was explored.1. For the ionic surfactants, as the tilt angle increases, enrichment ratio increases first and then decreases. However, recovery percentage decreases and then increases. There is an optimum tilt angle. The optimum tilt angle of CTAB was40°under the conditions of initial concentration0.07g·L-1, loading liquid volume250mL and gas flow200mL·min-1. The optimum tilt angle of SDS was40°under the conditions of initial concentration0.2g·L-1, loading liquid volume500mL and gas flow500mL·mm-1. The effects of the tilt length on foam separation efficiency were studied under the optimum tilt angle. The suitable length of inclined foam phase of CTAB was determined to be650mm and SDS was determined to be800mm.2. Using the IFC, the protein surfactants acquired the same law as the ionic surfactants. The optimum tilt angle of BSA was40°under the conditions of initial concentration0.1g·L-1, loading liquid volume250mL and gas flow300mL·min-1. The optimum tilt angle of WSP was40°under the conditions of initial concentration0.2g·L-1, loading liquid volume400mL and gas flow300mL·min-1. The suitable length of inclined foam phase of BSA and WSP were both determined to be500mm.3. To the protein solution, the gravitational force is the main driving force discharge liquid, and the ionic surfactant is mostly caused by the capillary pressure discharge effect. Tilt foam layer for draining effect on the promotion of the drain by gravity as the main driving force of the bubble phase system is more effective, with little fluid flow direction, therefore, surfactant protein enrichment ratio increased by a big margin,4. Generally, as the gas velocity increases, the enrichment ratio decreases and the recovery rate rises of both the VFC and the IFC. Increasing the gas velocity, the bubbles in the liquid’s residence time in the body are narrow. There has no sufficient time to absorb more surface-active substances, while increasing the gas velocity are also makes bubbles in the foam phase residence time narrow, there has not enough time to drain more entrained liquid, so the concentration decreases. However, increasing the gas velocity makes it more bubbles to blow from the tower, and the recovery increases. Comprehending the enrichment ratio and the recovery rate, the optimum gas flow of CTAB was200mL·min-1, SDS was500mL·min-1, BSA and WSP were both300mL·min-1.