Process Equipment Design -I — Winter 2025

Explain in brief about the equivalent length of pipes and joints

Write a brief note on NPSH for centrifugal pumps

Give the functions of various parts of shell and tube heat exchanger.

Write a brief note on Fluid allocation in shell and tube heat exchanger.

How baffle cut and baffle spacing affect tube outside heat transfer coefficient.

Discuss in detail about criteria of selection between kettle type and thermosyphon reboiler.

Discuss how to find or fix the recirculation ratio in the following conditions: (i) ΔPav ≈ ΔPt (ii) ΔPav > ΔPt (iii)ΔPav < ΔPt

Describe functions of down comer & mention types of down comers

Describe determination of minimum reflux ratio by McCabe-Thiele method.

Aqueous solution of ethanol contains 6% by mass ethanol. It is to be concentrated in the distillation column to 30 % ethanol by mass. Open steam, saturated at 80kPa g pressure will be used for distillation column. Feed flow rate is 5000 kg/hr and it is saturated liquid at its bubble point. Residue should not contain more than 0.02 mass percent ethanol. Sparging steam flow is 0.2 kg per kg of feed. Calculate the number of theoretical stages required for desired production Equilibrium data for Ethanol –Water system x 0.019 0.0721 0.0966 0.1238 0.1661 y 0.17 0.3891 0.4704 0.4704 0.5089

Define: 1) Light key 2) Heavy key 3) Adjacent key 4) Split Key

Discuss in brief the factors affecting selection of tray type1

Asaturated liquid, consisting of phenol and cresols with some xylenols, is fractioned to give a top product of 95.3 mole % phenol. Metacresol is heavy key and phenol is light key component. Total condenser is used. The composition of the top product and phenols in the bottoms are given. Take ν =1.71 for solving min. reflux ratio by under Component α Feed mole % Top Bottoms av Product mole % mole % phenol 1.98 35 95.30 5.24 o-cresol 1.59 15 4.55 ? m-cresol 1.00 30 0.15 ? Xylenol(s) 0.59 20 - ? Total 100 100.00

Describe effect of increase in reflux ratio on number of theoretical stages and utility requirement

Draw falling film type absorber and explain its advantages and disadvantages over the adiabatic type packed tower

Explain design procedure for Absorption tower for finding the height (Cornell’s method) and diameter of column

Discuss jet and downcomer flooding.

Write a brief note on packings used for packed bed absorption.

Discuss about the Liquid distributors, Liquid redistributors, Packing support and Hold-down plate for packed tower type absorber

How distribution coefficient affects liquid liquid extraction

Classify industrially important extractors.

Explain process design of settler

How to decide optimum solvent amount based on number of theoretical stages for liquid liquid extraction.

Discuss the desirable solvent properties for liquid-liquid extraction

Discuss the steps for process design of counter current multistage extractor