Document Type

Thesis

Date of Award

Spring 5-31-2017

Degree Name

Master of Science in Chemical Engineering - (M.S.)

Department

Chemical, Biological and Pharmaceutical Engineering

First Advisor

Kamalesh K. Sirkar

Second Advisor

R. P. T. Tomkins

Third Advisor

S. Basuray

Abstract

Carbon dioxide, a greenhouse gas and a major contributor to global warming, is released in large amounts by flue gases. To limit climate change, such CO2 emissions have to be reduced, CO2 captured and sequestered. Conventional monoethanolamine (MEA)-based absorption techniques are costly due to high capital cost and high energy consumption since the absorbent has to be regenerated at a high temperature ~ 120°C. A temperature swing membrane absorption (TSMAB) process was described by Mulukutla et al. (2015) using a novel membrane contactor, novel absorbents and a cyclic process. In this device, the absorbent is on the shell side of a membrane device containing two commingled sets of hollow fiber membranes. One set consists of porous hydrophobic hollow fibers through which the feed gas at 25-50°C comes in for a while and CO2 from this feed gas gets absorbed in the shell-side absorbent. After sometime when the absorbent gets saturated with CO2 and CO2 breaks through the other end of the membrane device, CO2-containing feed gas introduction is stopped. The membrane device has another set of solid essentially impermeable hollow fibers through the bore of which hot water is then passed for some time at a temperature ~ 80-95°C to desorb the absorbed CO2 from the absorbent into the bore of the porous hollow fibers. This purified CO2 stream is taken out for some time. Once the desorption process is over, the TSMAB cycle is initiated again with the CO2-containing feed gas coming in.

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