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WorksheetsSection 4.2.5. Separation of Dissolved Liquids PART 2
Total questions: 10
Worksheet time: 5mins
A refinery wants to remove trace sulfur compounds from a hydrocarbon stream without high energy costs. The best method is:
Solvent extraction
Adsorption using activated carbon
Ion exchange
Leaching
Which solvent property most strongly determines phase disengagement in extraction?
Polarity difference with feed solvent
Refractive index
Color
pH
Leaching kinetics are controlled mainly by:
Diffusion through solid pores
Solvent density
Heat of vaporization
Adsorption equilibria
In water softening by ion exchange, regeneration with NaCl restores:
Na⁺ ions on the resin
Ca²⁺ and Mg²⁺ ions
K⁺ ions
Sulfate groups
Which chromatography method separates based on molecular size?
Gel filtration chromatography
Ion exchange chromatography
Affinity chromatography
Partition chromatography
Which factor reduces solvent requirements in extraction?
High distribution coefficient of solute
High solvent miscibility
Low solute diffusivity
Smaller interfacial area
The main limitation of adsorption processes is:
Adsorbent regeneration cost
Low selectivity
Inability to handle gases
Lack of surface area
In countercurrent solvent extraction, the operating line lies:
Below the equilibrium curve for feasible separation
Above the equilibrium curve
Coincident with solvent line
Parallel to solute distribution
A biotech company wants to separate and purify fragile proteins. Which technique is most suitable?
Chromatography
Distillation
Leaching
Spray drying
An environmental plant needs to remove trace pesticides from groundwater at ppb levels. The most efficient method is:
Adsorption on activated carbon
Solvent extraction with hexane
Distillation
Ion exchange with NaCl resin
