Thermosyphon Reboilers, Simulation and Design

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THERMOSYPHON REBOILERS, SIMULATION AND DESIGN

Andrew W. Sloley
The Distillation Group, Inc.*
P.O. Box 10105
College Station, Texas 77842-0105

Gary R. Martin
Process Consulting Services Inc.
P.O. Box 1447
Grapevine, Texas 76099-1447

Published in
Encyclopedia of Chemical Processing and Design, Vol. 58
Marcel Dekker, Inc.
1997

Abstract copyright Andrew W. Sloley
1997

Thermosyphon reboilers provide a simple, low-maintenance design for distillation tower reboiler systems. Design of true thermosyphon exchangers requires an intimate knowledge of a distillation tower's heat balance, temperature levels, and pressure balance in the reboiler loop. Depending on system relative volatilities, the temperature levels vary strongly with composition gradients. This paper compares the commonly used simulation networks for different thermosyphon exchanger-distillation tower configurations. The implications on exchanger design of the correct and incorrect simulation configuration will be shown in case studies of two industrial units. The two cases compare a low relative volatility (alpha) system (ethylene-ethane splitter) and a high alpha system (fluid catalytic cracking unit deethanizer). Main factors presented include impact on equipment size and design. Proper design criteria for the simulation of the thermosyphon exchanger and distillation tower and for integrating process and equipment design are shown.

Electronic version not available.

Papers 34, 35, and 16 cover similar material.

*current affiliation

This page updated June 1, 1999.
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