Membrane separation of enzyme-converted biomass compounds: Recovery of xylose and production of gluconic acid as a value-added product

Abstract

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Modelling of oligodextran production via an immobilized enzyme membrane reactor: Bioreaction-separation coupling mechanism

“…The mass transfer rate of solute (N s ) across an enzymatic layer is attributed to both diffusive and convective transport [10],…”

“…where C w is the solute concentration near the membrane surface, C b is the bulk concentration, and k r is the convective and diffusive mass transfer coefficient and can be calculated using the following correlation [10],…”

“…Meanwhile, the product has to be timely transported to the other side of the membrane to eliminate the production inhibition. The substrates transport through the enzymatic membrane layer is influenced by diffusive flow and the convective flow (depending on the transmembrane pressure) [10]. Hence, numerical methods are frequently adopted to analyze the complicated mass transfer phenomenon in the EMR [11][12][13][14].…”

Enzyme production ofd-gluconic acid and glucose oxidase: successful tales of cascade reactions

“…346 This was later utilized in biorefinery liquors obtained from hydrothermal pretreatment of wheat straw, corn stover and Miscanthus stalks. 347 In another research effort, glucose oxidase and catalase were coimmobilized using a sol-gel protocol on silica inverse opals and utilized to oxidize glucose (with a yield of 98.97%) from commercial isomalto-oligosaccharide preparations. 348 The operational stability requires improvement, as less than 80% of the enzyme activity remained after 6 reuses.…”

Modeling Biowaste Biorefineries: A Review

“…The overall goal of the pretreatment is reducing the crystallinity of the raw feedstock and making the C5-, C6-sugars, and other structural components more accessible for the conversion steps. The fraction of biomass that is eventually not converted in one of the Tien et al, 2014 Blocking model for membrane filtration Ashraf et al, 2017 Semi-empirical pervaporation flux model Vane, 2005 Review of pervaporation for product recovery Morthensen et al, 2018 Membrane separation of enzyme-converted biomass Díaz-Reinoso et al, 2017 Recovery of concentrated phenolic product via membrane process targeted products has to be separated from the product stream and decreases the process' carbon efficiency. Commonly used pretreatment steps include ammonia conditioning, (diluted) acid pretreatments, mechanic pretreatments (milling, i.a.…”