Optimum reflux ratio in a continuous distillation column is determined by the__________________?
Correct answer: C. Total cost consideration (fixed cost of the column plus the cooling water & steam cost)
- A. Maximum permissible vapour velocity
- B. Flooding limit of the column
- C. Total cost consideration (fixed cost of the column plus the cooling water & steam cost)
- D. None of these
Explanation
The economic optimum reflux is where annual fixed cost and operating costs are balanced. Increasing reflux raises steam and cooling-water costs, whereas low reflux requires a larger column and more trays, so total cost is minimized at an intermediate value.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
Practise Mass Transfer Operations
669 free Mass Transfer Operations MCQs from Chemical Engineering, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Chemical Engineering questions like this
Chemical Engineering is on this paper prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for it.
More Mass Transfer Operations questions
Bubble cap diameter used for the distillation column having diameter ranging from 1.5 to 4.5 metres is about ______________ mm?
Commercial packed scrubbers are normally designed for a pressure drop range of ______________ mm water column per metre of packed height?
The slope of operating line in the rectifying section of a distillation column is unity, if the reflux ratio is___________________?
In a rotary drier, the average retention time of solid is (where Z = length of the drier, metres ρ = apparent solid density, kg/m3 L = flow rate of dry solids, kg/see. m2 drier crosssection H = hold up of solid.) ?
The approximate liquid depth in an agitation tank is equal to (where, d = tank diameter)_________________?
____________ is the determining factor for the number of bubble caps to be used per tray?