A. Thermal decomposition of bottoms
B. Increased relative volatility
C. Erosion of the tower
D. Very efficient operation
Correct Answer: Thermal decomposition of bottoms ✔
Last Updated: February 15, 2019
Related MCQs
- In the layout plan for a vacuum distillation unit, operating at 60 mm Hg, supported by a barometric condenser, the appropriate place for the location of vacuum drum for collecting the distillate will be__________?
- Which of the following is directly concerned with Psychrometry ?
- Measurement of the interfacial area of mass transfer is achieved easily & accurately in case of a __________ column?
- At the boiling point of the liquid at the prevailing pressure, the saturated absolute humidity becomes__________?
- Ammonia present in the coke oven gas is removed by washing with__________?
- Most important factor to be considered in the selection of packings for absorbers is the __________ of packing?
- Which of the following provides maximum contact surface for a liquid-vapour system ?
- Experimental determination of __________ is done by wetted wall column method?
- Which is not concerned directly with mass transfer ?
- To get high tray efficiency__________?
- For ethanol-water system, the lowering of distillate quality from 95% to 92% will cause __________ plate requirement?
- Lewis number (Le) is__________?
- In a gas-liquid absorption column, for obtaining the maximum absorption efficiency__________?
- Humidity chart is useful for the solution of problems concerning condensation, vaporisation and air conditioning. At a given dry bulb temperature, value of humidity obtained from the humidity chart directly, is in terms of __________ humidity?
- Powdery materials can be guarded against caking tendency on storage by__________?
- Leaching of uranium ore and gold ore is done in__________?
- For a ternary mixture, in which equilateral triangular co-ordinate is used in leaching and extraction, a __________ of the equilateral triangular co-ordinates?
- The slope of the operating line for a single component co-current absorber when plotted in terms of mole ratio units is__________?
- The minimum liquid rate to be used in an absorber corresponds to an operating line__________?
- Separation of two volatile liquids by distillation makes use of their__________?
- The critical moisture content in case of drying indicates the __________ rate period?
- In case of physical adsorption, the difference between heat of adsorption and heat of normal condensation is__________?
- A solid is being dried in the linear drying rate regime from moisture content Xo to XF. The drying rate is zero at X = 0 and the critical moisture content is the same as the initial moisture Xo. The drying time for M = (Ls/ARc) is (where, L = total mass of dry solid, A = total surface area for drying Rc = Constant maximum drying rate per unit area X = moisture content (in mass of water/mass of dry solids)) ?
- The drying time between fixed moisture content within diffusion controlled ‘falling rate period’ is proportional to (assuming that drying occurs from all surfaces of the solid) (where, T = thickness of the solid) ?
- The dew point of an unsaturated gas-vapor mixture does not depend upon the __________ of the mixture?
- The Hatta number is important in__________?
- Freundlich equation applies to the adsorption of solute from__________?
- The slope of 9-line is determined by the__________?
- For a binary mixture with low relative volatility__________?
- The interfacial area per unit volume of dispersion, in a gas-liquid contactor, for fractional hold up of gas = 0.1 and gas bubble diameter = 0.5 mm is given by (in m2/m3)__________?
- Plate efficiency in a distillation column is reduced due to the __________ of liquid?
- In extraction, as the temperature increases, the area of heterogeneity (area covered by binodal curve)__________?
- The wet and ‘dry bulb temperature for a vapour-gas mixture are 25°C and 30°C respectively. If the mixture is heated to 45°C at constant pressure, the wet bulb temperature will be __________ °C ?
- Raoult’s law does not apply, when the__________?
- In most of the mechanically agitated liquid-liquid extractors, baffles or horizontal compartmental plates are provided, which helps in__________?
- Rayleigh’s equation applies to __________ distillation?
- Blowdown in a cooling tower__________?
- pertaining to the analogy between equations of heat and mass transfer operations ?
- Water entrained by circulating air in cooling towers is termed as__________?
- Alcohol is dehydrated using __________ distillation?
- When the mixture to be distilled has a very high boiling point and the product material is heat sensitive, the separation technique to be used is __________ distillation?
- Mechanism of moisture removal in case of freeze drying of food stuff is by __________?
- Molality is defined as the number of gm moles of solute per __________ of solvent ?
- Flash distillation is __________?
- When an unsaturated air-water mixture is heated at constant pressure, then __________ ?
- Danckwerts developed the __________ theory?
- Leaching of coarse solid lumps is also termed as __________?
- Steam distillation is used to__________?
- Which of the following can be calculated theoretically using steam table and Dalton’s law of partial pressure; if the relative humidity and dry bulb temperature of moist air is known ?
- In a vapor-liquid contacting equipment, the overall gas phase mass transfer co-efficient (M.T.C), KG is related to individual co-efficients (KG and KL) as __________ ?
- Rayleigh equation applies to __________ distillation ?