AS
Authored
15 records found
Syngas fermentation to ethanol
The effects of gas recycling on economics
Syngas fermentation is a biochemical pathway to produce ethanol and has been commercialized successfully. The economic viability of this process could be further improved to become more competitive in the existing ethanol market. Improving gas utilization is the key, and can be d
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Biomass-specific rates as key performance indicators
A nitrogen balancing method for biofilm-based electrochemical conversion
Microbial electrochemical technologies (METs) employ microorganisms utilizing solid-state electrodes as either electron sink or electron source, such as in microbial electrosynthesis (MES). METs reaction rate is traditionally normalized to the electrode dimensions or to the elect
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Turning waste into value
Eco-efficient recovery of by-products from biomass pretreatment in lignocellulosic biorefineries
This original research contributes to enhancing the viability of biorefineries through recovering valuable by-products from the liquid remaining after the biomass pretreatment by hot liquid water. A novel downstream processing method is developed for the recovery of acetic acid,
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Production of bio-based acetate is commonly hindered by the high costs of the downstream processing. In this paper, a model is developed to describe a new method that recovers acetate salts using anion exchange resins, and subsequently desorbs and upgrades them using CO2-expanded
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Effect of <sub>H2</sub>:COratio on theoretical carbon yield of bio-syngas and basic oxygen furnace gasfermentation to chemicals
A thermodynamic and metabolic-based approach
Syngas fermentation is an up-and-coming technology that uses acetogenic microorganisms to produce ethanol at the commercial scale. Acetogens can produce many different types of products via their metabolic pathway called the Wood Ljugdahl Pathway (WLP). The WLP can natively produ
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Effect of <sub>H2</sub>:COratio on theoretical carbon yield of bio-syngas and basic oxygen furnace gasfermentation to chemicals
A thermodynamic and metabolic-based approach
Syngas fermentation is an up-and-coming technology that uses acetogenic microorganisms to produce ethanol at the commercial scale. Acetogens can produce many different types of products via their metabolic pathway called the Wood Ljugdahl Pathway (WLP). The WLP can natively produ
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Strong anion exchange recovery of aqueous dicarboxylates
Extraction and sorption equilibrium comparison
Ion-exchange can be used for primary recovery of aqueous dicarboxylic acids at neutral pH, where there is almost complete acid dissociation. The equilibria of anion exchange of aqueous dicarboxylate anions (fumarate, itaconate, malate and succinate) with anions (Cl− and OH−) boun
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Downstream of the bioreactor
Advancements in recovering fuels and commodity chemicals
Downstream processing aims at recovering the target product at the required specifications from the bioreactor effluent. Research and development in this field relies on experimental and mathematical tools at the levels of chemical components, unit operations and processes. Recen
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In situ product removal by direct crystallization
An attractive approach for process integration of whole-cell biocatalyzed reactions
In biochemical industry, downstream processing is often the cost-limiting factor during the production of pharmaceutical and fine-chemical products because low product concentrations are usually obtained from the reactor, requiring a large train of separation and purification ste
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BACKGROUND: Isopropanol and acetone production by syngas fermentation is a promising alternative to conventional fossil carbon-dependent production. However, this alternative technology has not yet been scaled up to an industrial level owing to the relatively low product concentr
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The aim of this work was to recover a mixture of carboxylates ranging from 2 to 7 carbon atoms using a strong anion exchange resin, followed by desorption with CO2-expanded methanol. Medium chain carboxylates hexanoate and heptanoate adsorbed better than acetate, and the correspo
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Syngas fermentation to biofuels and chemicals is an emerging technology in the biobased economy. Mass transfer is usually limiting the syngas fermentation rate, due to the low aqueous solubilities of the gaseous substrates. Membrane bioreactors, as efficient gas–liquid contactors
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Distillation is the most used separation technology at industrial-scale, but using distillation in bio-based processes (e.g. fermentation processes to produce bioethanol) is quite challenging when mild temperatures are needed to keep the microbes alive. Vacuum distillation can be
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In gas fermentations (using O2, CO, H2, CH4 or CO2), gas-to-liquid mass transfer is often regarded as one of the limiting processes. However, it is widely known that components in fermentation broths (e.g., salts, biomass, proteins, antifoam, and organic products such as alcohols
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Isobutanol is a highly attractive renewable alternative to conventional fossil fuels, with superior fuel properties as compared to ethanol and 1-butanol. Even though the isobutanol production by fermentation has significant potential, complex downstream processing is limiting the
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Contributed
5 records found
Conceptual Design of a HMF Process
A comparison between TBP and MIBK as organic solvents for Reactive Extraction
5-hydroxymethylfurfural (HMF) is a versatile renewable base chemical, which can be produced by the acid-catalyzed dehydration of fructose. At this time HMF cannot yet compete with oil-based analogues, such as p-xylene, due to the high costs of production. Future incentives to enc
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Producing chiral amines
A bi-enzymatic cascade involving Old Yellow Enzymes and amine dehydrogenases
Chiral amines are valuable compounds for their use as building blocks for pharmaceutical and fine chemical industries. Previously, chiral amines were made with metals as catalysts, but these are unsustainable and difficult to remove from the product. Organocatalysis is a sustaina
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Bubble property determination
Comparison between bubble data from a fibre probe, and a camera
An optical fibre probe was tested in liquids with biotechnologically relevant compounds, to determine if any limits arise in bubble property determination due to these compounds. The data from this fibre probe was compared to the data from a camera for which an image processing a
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The computational power problem: a compartment model solution
Automating the dynamic compartmenting of a stirred-tank reactor
Presented works describe a novel approach to assess mixing in a stirred vessel using light-based tomography. The study is driven by key research questions: What are the obstacles in three-dimensional dynamic tracer distribution reconstruction? How should the experimental equipmen
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