Impact of intermolecular interactions on the nanofiltration of pulping liquor

Schlackl, Klaus; Bischof, Robert H.; Fackler, Karin; Samhaber, Wolfgang

doi:10.1016/j.seppur.2020.117177

Cited by 12 publications

(3 citation statements)

References 32 publications

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“…Hydrogen bonds between the hemicelluloses and hydroxy acids appear to affect the retention of the latter. Similar observations were previously published for the nanofiltration of wood hydrolysates, in which hydrogen bonds between lignosulfonate and furan derivatives increased the retention of some furan derivatives, dependent on the oxygen configuration in the molecule [ 21 ]. The capability to form hydrogen bonds with different biopolymers is essential for the natural function of xylan, and this was already studied by several authors with different prospects.…”

Section: Resultssupporting

confidence: 87%

Intermolecular Interactions in the Membrane Filtration of Highly Alkaline Steeping Lye

et al. 2021

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The reuse of steeping lye is crucial for the sustainable production of viscose fibers. Steeping lye contains hemicellulose and many alkaline degradation products, such as organic acids, so that its purification can be evaluated in terms of total organic carbon removal. When considering purification by membrane filtration, intermolecular interactions between hemicellulose and organic acids can strongly affect their retention efficiency. Herein, we give more insights into the ultrafiltration and nanofiltration of steeping lye and corresponding model solutions. Furthermore, we studied the impact of total organic carbon concentration, hemicellulose concentration and sodium hydroxide concentration on the membrane performance. Hydrogen bonds between hemicellulose and certain types of hydroxy acids increased the retention of the latter. In contrast, charge based repulsion forces led to a decreased retention of a certain type of hydroxy acids. It can be clearly shown that taking intermolecular interactions into account is highly important for the description of complex multicomponent mixtures. In addition, the results can be extended to other, highly alkaline process streams with organic content, such as Kraft pulping liquors.

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Section: Resultssupporting

confidence: 87%

Intermolecular Interactions in the Membrane Filtration of Highly Alkaline Steeping Lye

et al. 2021

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“…This side-stream consists mainly of different wood degradation products, for example, soluble carbohydrates in the form of sugars, lignosulfonates, and aldonic acids. 3,4 The latter are formed during the reaction of aldoses in oxidative environments. In the sulfite pulp process, oxidation occurs mainly in the process step of glycosidic cleavage of hemicellulose chains.…”

Section: ■ Introductionmentioning

confidence: 99%

“…In this respect, spent sulfite liquor ( SSL ) is an abundant side-stream in the pulp and paper industry, which is rich in various carbon sources that can serve as a feedstock for several bio-based platform chemicals. This side-stream consists mainly of different wood degradation products, for example, soluble carbohydrates in the form of sugars, lignosulfonates, and aldonic acids. , The latter are formed during the reaction of aldoses in oxidative environments. In the sulfite pulp process, oxidation occurs mainly in the process step of glycosidic cleavage of hemicellulose chains. , …”

Section: Introductionmentioning

confidence: 99%

Electrocatalytic Reduction of Aldonic Acids to Aldoses on Gold Electrodes

Wolfsgruber

Rodrigues

Cruz

et al. 2022

ACS Sustainable Chem. Eng.

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Spent sulfite liquor, a side-stream from the pulp and paper industry, is an abundantly available carbon source for bio-based platform chemicals. The biotechnological valorization of side streams in biorefineries is hampered by the inability of many microorganisms to metabolize and deal with aldonic acids. Based on the principles of Green Chemistry, the electrochemical reduction of aldonic acids into the corresponding biomass sugars appears as a prospective process for the conversion of these acids into fermentable carbohydrates. In our paper, the investigation of electrochemical reduction of gluconic and xylonic acids into glucose and xylose, respectively, is presented. The proposed mechanism on a gold-coated silver electrode was determined via ReaxFF molecular dynamics simulations and quantum chemistry calculations. Model solutions with an aldonic acid concentration of 2.5 wt % were used for the experiments. Compared to a two-electrode compartment cell, the amounts of glucose and xylose produced in the undivided cell were more than 4 and 5.5 times higher, respectively. The electrode surface was analyzed by scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy. Despite the relatively low conversion rate, our results show that electrochemical reduction of aldonic acids into their corresponding aldoses in model solutions is possible, which represents an important step toward side-stream valorization.

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Simultaneous posthydrolysis and liquid–liquid extraction: a SIMPLLE process to detoxify eucalyptus prehydrolysis liquor

Almhofer

Paulik

Bischof

2023

Biomass Conv. Bioref.

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The prehydrolysis liquor from the prehydrolysis Kraft process is rich in sugars and could thus serve as a sustainable feedstock for the production of various chemicals. However, its industrial utilization is impeded by the presence of fermentation inhibitors and extensive lignin precipitation, the latter receiving only little attention in the literature.In order to provide a feedstock suitable for biotechnological or chemical conversion, the prehydrolysis liquor from eucalyptus wood must be detoxified whilst preventing the precipitation of lignin. To increase the yield of monomeric sugars, acid posthydrolysis should be investigated.Various solvents and solvent mixtures were screened for the high temperature liquid–liquid extraction of isothermally separated prehydrolysis liquor. Their capability to prevent lignin precipitation and to extract fermentation inhibitors was assessed using mass balances and size-exclusion chromatography. Based on the solvent screening, a process for simultaneous posthydrolysis and liquid–liquid extraction of eucalyptus prehydrolysis liquor was proposed and investigated using statistic experimental design.Liquid–liquid extraction using aliphatic alcohols effectively prevents lignin precipitation, and the addition of 25% (w/w) tri-n-octylamine was found to increase the overall inhibitor extraction efficiency. The conditions for the simultaneous posthydrolysis were investigated using a Box-Behnken experimental design, allowing for a maximum monomeric sugar yield of 83.0% at a sugar purity of 91.6%.The simultaneous posthydrolysis and liquid-liquid extraction (SIMPLLE) process thus avoids industrial-level problems associated with lignin precipitation. It provides a carbohydrate-rich stream with low levels of fermentation inhibitors, enabling further conversion to value added products.

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Impact of intermolecular interactions on the nanofiltration of pulping liquor

Cited by 12 publications

References 32 publications

Intermolecular Interactions in the Membrane Filtration of Highly Alkaline Steeping Lye

Intermolecular Interactions in the Membrane Filtration of Highly Alkaline Steeping Lye

Electrocatalytic Reduction of Aldonic Acids to Aldoses on Gold Electrodes

Simultaneous posthydrolysis and liquid–liquid extraction: a SIMPLLE process to detoxify eucalyptus prehydrolysis liquor

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