Foam Separation ppt.ppt
- 1. FOAM SEPARATION OF TRIBUTYL PHOSPHATE BY M.ARULMOZHI LECTURER IN CHEMICAL TECHNOLOGY BHARATHIDASAN INSTITUTE OF TECHNOLOGY BHARATHIDASAN UNIVERSITY,TRICHY-24
- 2. Introduction: Foam fractionation is a technique useful for the separation and concentration of complex heat sensitive and chemically unstable materials like proteins, enzymes, dyes, metal ions etc Foam Separation processes have been utilized to separate and concentrate effectively a variety of constituents from dilute aqueous solutions. When a solution containing surface active substances is foamed with an inert gas, the foam will be richer in these solutes than the residual liquid. This foam can then be collected and condensed to produce a rich liquid product. The two characteristic features of foam, useful in separation, are its large gas-liquid interfacial area and very low liquid holdup
- 3. Tributyl phosphate(TBP) It is a non-flammable, non-explosive, colorless and odorless liquid. It has a boiling point of 2890C and solubility in water is 0.42 g/l. It is thermally unstable and begins to decompose at temperatures below its boiling point. It is used for solvent extraction and is a very hazardous effluent from nuclear industry. It can not be recovered by distillation because of its high boiling point.
- 4. EXPERIMENT: Batch foam column operation is conducted in two sequential steps. In the first step, foam is generated up to the desired height by passing gas bubbles into a pool of liquid. In the second step, the foam is permitted to drain. The liquid from the foam drains into the liquid pool below.
- 5. The experimental setup consists of a glass tube (column), filter cloth, sintered glass tube, Rubber stopper, Rota meter Compressor etc.,
- 7. Results and Discussion: The enrichment ratio and residual ratio are defined respectively as Enrichment Ratio = Concentration of foam that overflows Feed Concentration Residual Ratio= Concentration of bulk liquid in the column Feed Concentration
- 8. RESULTS AND DISCUSSION:- Constants: Tributyl phosphate concentration = 1.52 * 10-3 mol / l Air flow rate = 12 LPH Contact time = 30 min Height of liquid level = 18 cm pH = 3.4 variable : SDS concentration in mol / l SDS conc. *10-3 mol /l Foam conc. *10-3 mol /l Residual conc. *10-3 mol / l Enrichment Ratio Residual Ratio 1.734 2.600 3.468 4.334 5.020 2.432 2.250 1.976 1.915 1.748 1.246 1.322 1.398 1.459 1.489 1.6 1.48 1.30 1.26 1.15 0.82 0.87 0.92 0.96 0.98
- 9. SDS conc. vs Enrichment ratio 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 1.734 2.6 3.468 4.334 5.02 SDS conc.(x 10-3 mol/lit) Enrichment ratio
- 10. SDS conc. vs residual ratio 0.7 0.75 0.8 0.85 0.9 0.95 1 1.734 2.6 3.468 4.334 5.02 SDS conc. (x 10-3 mol/l) Residual ratio
- 11. Constants: SDS concentration = 1.734 * 10-3 mol / lit Air flow rate = 12 LPH Contact time = 30 min Height of liquid level = 18 cm pH = 3.4 variable : Tributyl Phosphate concentration in mol / lit TBP conc. *10-3 mol /lit 1.52 3.04 4.56 6.08 7.60 Foam conc. *10-3 mol /Lit 2.432 4.651 7.159 9.667 11.78 Residual conc. *10-3 mol / lit 1.246 2.539 3.694 4.934 6.080 Enrichme nt Ratio 1.6 1.53 1.57 1.59 1.55 Residual Ratio 0.82 0.83 0.81 0.81 0.80 Recovered TBP concentration increases with the rise in the initial TBP concentration.
- 12. Initial TBP conc. vs recovered TBP conc. 0 2 4 6 8 10 12 14 1.52 3.04 4.56 6.08 7.6 Initial TBP conc. (x10-3 mol/l) Recovered TBP conc. (x10-3 mol/l)