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Title Mixed matrix membranes for mixture gas separation of butane isomers
Publication Date
Date Accessioned
Degree PhD
Discipline/Department Chemical Engineering
Degree Level doctoral
University/Publisher Georgia Tech
Abstract The goal of this project was to understand and model the performance of hybrid inorganic-organic membranes under realistic operating conditions for hydrocarbon gas/vapor separation, using butane isomers as the model vapors and a hybrid membrane of 6FDA-DAM-5A as an advanced separation system. To achieve the set goal, three objectives were laid out. The first objective was to determine the factors affecting separation performance in dense neat polymer. One main concern was plasticization. High temperature annealing has been reported as an effect means of suppressing plasticization. A study on the effect of annealing temperature was performed by analyzing data acquired via sorption and permeation measurements. Based on the findings from this study, a suitable annealing temperature was determined. Another factor studied was the effect of operating temperature. In deciding a suitable operating temperature, factors such as its possible effect on plasticization as well as reducing heating/cooling cost in industrial application were considered. Based on the knowledge that industrial applications of this membrane would involve mixture separation, the second objective was to understand and model the complexity of a mixed gas system. This was investigated via permeation measurements using three feed compositions. An interesting transport behavior was observed in the mixed gas system, which to the best of our knowledge, has not been observed in other mixed gas systems involving smaller penetrants. This mixed gas transport behavior presented a challenge in predictability using well-established transport models. Two hypotheses were made to explain the observed transport behavior, which led to the development of a new model termed the HHF model and the introduction of a fitting parameter termed the CAUFFV fit. Both the HHF model and CAUFFV fit showed better agreement with experimental data than the well-established mixed gas transport model. The final objective was to explore the use of mixed matrix membranes as a means of improving the separation performance of this system. A major challenge with the fabrication of good mixed matrix membranes was the adhesion of the zeolite particle with the polymer. This was addressed via sieve surface modification through a Grignard treatment process. Although a Grignard treatment procedure existed, there was a challenge of reproducibility of the treatment. This challenge was addressed by exploring the relationship between the sieves and the solvent used in the treatment, and taking advantage of this relationship in the Grignard treatment process. This study helped identify a suitable solvent, which allowed for successful and reproducible treatment of commercial LTA sieves; however, treatment of lab-made sieves continues to prove challenging. Based on improved understanding of the Grignard treatment reaction mechanism, modifications were made to the existing Grignard treatment procedure, resulting in the introduction of a "simplified" Grignard treatment procedure. The new procedure…
Subjects/Keywords Mixed matrix membranes; Mixed gas permeation; Butane isomers; Gases Separation; Gas separation membranes; Membranes (Technology); Separation (Technology)
Contributors Dr. William Koros (Committee Chair); Dr. Amyn Teja (Committee Member); Dr. Carson Meredith (Committee Member); Dr. Karl Jacob (Committee Member); Dr. Victor Breedveld (Committee Member)
Country of Publication us
Record ID handle:1853/42929
Repository gatech
Date Indexed 2020-05-13
Issued Date 2011-11-14 00:00:00
Note [degree] PhD; [advisor] Committee Chair: Dr. William Koros; Committee Member: Dr. Amyn Teja; Committee Member: Dr. Carson Meredith; Committee Member: Dr. Karl Jacob; Committee Member: Dr. Victor Breedveld;

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