자료유형  

 학위논문

Control Number  

0017164462

International Standard Book Number  

9798384043706

Dewey Decimal Classification Number  

620.11

Main Entry-Personal Name  

Speer, David.

Publication, Distribution, etc. (Imprint  

[S.l.] : University of Michigan., 2024

Publication, Distribution, etc. (Imprint  

Ann Arbor : ProQuest Dissertations & Theses, 2024

Physical Description  

146 p.

General Note  

Source: Dissertations Abstracts International, Volume: 86-03, Section: B.

General Note  

Advisor: Tuteja, Anish.

Dissertation Note  

Thesis (Ph.D.)--University of Michigan, 2024.

Summary, Etc.  

요약Liquid-liquid extraction (LLE) is one of the most common and widely utilized separation techniques in industrial processes to date, with countless industrial systems employing this unit operation around the world. Although LLE offers an easy and low-energy methodology for separating miscible liquids, its design is necessarily constrained by the need to avoid the formation of emulsions. Emulsions, while very effective in helping an extraction process reach its thermodynamic equilibrium, are difficult to separate out, often rendering the entire LLE system economically unviable. As such, LLE operations typically avoid emulsion formation and instead opt for non-emulsified systems that typically have lower extraction efficiencies and correspondingly higher operating costs. In the production of volatile fatty acids (VFAs) from fermentation broth, for example, the separation block can be responsible for up to half of the overall process cost. Alternatives to LLE, such as distillation or electrodialysis, struggle with similar tradeoffs related to high economic or environmental costs. The ideal miscible liquid separation system should be highly energy-efficient, possess low operating costs, easily scalable, and compatible with existing industrial processes. In this dissertation, we describe how our recently developed membrane-based LLE process termed as Continuous Liquid-liquid Extraction And in-situ Separation (CLEANS) operates at high efficiency with reduced operating costs and minimal energy input. We examine the recovery of volatile fatty acids (VFAs) and ammonia via CLEANS, and make note of our separation technology's unique strengths.This dissertation begins by addressing one of the most ubiquitous challenges faced by any membrane-based process-surface fouling. We show that our optimized hydrophilic and oleophobic (HL/OP) membranes are capable of rapidly separating emulsions many times faster than by gravity alone, and that they can function even after over a month of continuous fouling in oil. Next, we design a CLEANS based LLE process using these HL/OP membranes. Our optimized CLEANS process demonstrates a capacity to recover VFAs over an order of magnitude more efficiently than has been reported previously. We then study the scale up and techno-economics of the developed CLEANS system for VFA extraction. Our work illustrates that the CLEANS process enables highly consistent extraction efficiency across variable scales of operation, as well as significantly lower operating costs and shorter payback periods when compared with traditional LLE operations. Finally, we expand the utility of our CLEANS processes by demonstrating its effectiveness in converting dissolved ammonia found in wastewater directly into ammonium sulfate, a product that is widely utilized as a fertilizer. We highlight our CLEANS process' unique advantages for this particular application-namely, that it does not require heating of the feed stream, nor the addition of costly or environmentally detrimental chemicals. Overall, this dissertation aims to demonstrate the utility of the CLEANS process to act as an effective recovery methodology for a wide variety of industrially relevant chemical species. We anticipate that the CLEANS process may prove beneficial for separation across a diverse set of industries including bio-processing, fuel purification, wastewater treatment, chemical synthesis, and many more.

Subject Added Entry-Topical Term  

Materials science.

Subject Added Entry-Topical Term  

Chemical engineering.

Subject Added Entry-Topical Term  

Analytical chemistry.

Subject Added Entry-Topical Term  

Biochemistry.

Index Term-Uncontrolled  

Liquid-liquid extraction

Index Term-Uncontrolled  

Membrane technology

Index Term-Uncontrolled  

Separation processes

Index Term-Uncontrolled  

Volatile fatty acids

Index Term-Uncontrolled  

Ammonium sulfate

Added Entry-Corporate Name  

University of Michigan Materials Science and Engineering

Host Item Entry  

Dissertations Abstracts International. 86-03B.

Electronic Location and Access  

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Control Number  

joongbu:653812