Chemical Engineering Answers

a) An aqueous reactant stream (4mol/liter) passes through a mixed flow reactor followed by a plug flow reactor. Find the concentration at the exit of the plug flow reactor if in the mixed flow reactor CA-Imol/liter. The reaction is second onder with respect to A: the volume of the plug flow reactor is three times that of the mixed flow reactor. What is the effect on the exit concentration when the reactor combination is neversed for the same feed rate and by how much?

At 500K, the rate of a bimolecular reaction is ten times the rate at 400K Find the activation energy for this reaction from Arhenius theory and collision state theory. Calculate percentage differences of rates from both the reactions.

a) A gas A, decomposes ineversibly to form a gas. C, as per the reactionA→2C. The decomposition of A is a first order reaction and is carried out in an isothermal constant pressure and volume batch reactors separately. Derive the expression for the pressure and volume (both separately) of the system as a function of time, assuming gas behave ideally.

At the boiling point of a completely immiscible system of two liquids, the partial of pressure component in the vapour phase is. a) Always less than its vapour pressure at that temperature b) Always greater than its vapour pressure at that temperature. c) Equal to its vapour pressure at that temperature

d) Dependent on nature and the amount of the other component in the liquid phase

lon exchange resin is

a) Linear substance. b) Low molecular weight substance

c) Organic polymer with porous structure

d) Soluble

Adsorption of gases on solids a) Increases with increasi temperature

b) Decreases with increasing temperature. c) Decreases with decreasing temperature

d) Remains constant with increasing temperature

Adsorption of gases on solids a) Increases with increasi temperature

b) Decreases with increasing temperature. c) Decreases with decreasing temperature

d) Remains constant with increasing temperature

In a binary distillation, the separation of the components is easier if the relative volatility.(α) is

a)α >>1

b) α << 1 c)α=l

d) None of the above

2. In azeotropic distillation the third component is added

a) To form another azeotrope with one of the components b) To increase the relative volatility of the original two components

c) To decrease the relative volatility of the original two components

d) None of the above

1. The number of ideal stages required in a fractionation column is minimum at

a) Minimum reflux ratio

b) Total reflux ratio

c) Optimum reflux ratio d) Reflux ratio of zero