Analysis of Acid Gas Absorption in a Mixed Amine
absorption and stripping of the acid gases, carbon dioxide and hydrogen sulfide, is an
important unit operation in industrial gas processing. The goal of this thesis was to
develop computationally efficient, accurate and robust algorithms for calculating local
interphase transfer rates in absorption and stripping columns. Within the context of
steady-state Film Theory, mass... read moretransfer is governed by a set of nonlinear differential
equations. An approximate solution was developed by applying a variant of the
linearization technique of Van Krevelen and Hoftijzer (1948). The algorithm was applied
to simulate absorption of CO2 and H2S in aqueous blends of diethanolamine (a secondary
amine) and methyldiethanolamine (a tertiary amine). Calculated enhancement factors, by
which reactions multiply absorption rates, differed by less than 5% from exact values.
The results also conformed with the well-established behavior of tertiary amine
solutions: H2S absorption is gas-phase mass transfer-limited and CO2 absorption is
Thesis (M.S.)--Tufts University, 2017.
Submitted to the Dept. of Chemical and Biological Engineering.
Advisor: Jerry Meldon.
Committee: Derek Mess, and Christoph Börgers.
Keyword: Chemical engineering.read less