Pressure Filtration of Australian Bagasse Pulp

Rainey, Thomas J.; Doherty, William O.S.; Martinez, D. Mark; Brown, Richard J.; Kelson, Neil A.

doi:10.1007/s11242-010-9649-x

Cited by 14 publications

(9 citation statements)

References 6 publications

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“…The specific surface area of straw decreased from 2,961 cm 2 cm À3 to 519 cm 2 cm À3 by delignification, which might have resulted from swelling without particular defibration of the particles. Previously, surface areas of 1,400-2,800 cm 2 cm À3 have been reported for bagasse pulp (Rainey et al, 2011). Increased liquid viscosity by dissolved lignin is not expected to coincide with the most challenging permeability conditions, that is, at the bottom of the column in late stages of delignification.…”

Section: Limits Of Operability Of An Industrial Scale Columnmentioning

confidence: 87%

“…An empirical model for the compressibility of straw was modified from the model described for bagasse by Rainey et al (2011). In addition to the compressibility factors M and N of the original model, a third parameter was included, describing the initial straw density at zero compression, c 0 .…”

Section: Simulationsmentioning

confidence: 99%

“…However, flow-through processing of herbaceous material such as straw may face challenges due to the compressibility of the materials, which can lead to high feed pressures, limited flow rate and volumetric productivity, and even clogging of the bed (Rainey et al, 2011). On the other hand, the low density of freely packed straw requires high liquid volumes for facilitating flow-through and subsequent displacement washing (Chevanan et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

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The effect of direct and counter‐current flow‐through delignification on enzymatic hydrolysis of wheat straw, and flow limits due to compressibility

Pihlajaniemi

Sipponen

Pastinen

et al. 2016

Biotech & Bioengineering

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This article compares the processes for wheat straw lignocellulose fractionation by percolation, counter-current progressing batch percolation and batch reaction at low NaOH-loadings (3-6% of DM). The flow-through processes were found to improve delignification and subsequent enzymatic saccharification, reduce NaOH-consumption and allow reduction of thermal severity, whereas hemicellulose dissolution was unaffected. However, contrary to previous expectations, a counter-current process did not provide additional benefits to regular percolation. The compressibility and flow properties of a straw bed were determined and used for simulation of the packing density profile and dynamic pressure in an industrial scale column. After dissolution of 30% of the straw DM by delignification, a pressure drop above 100 kPa m led to clogging of the flow due to compaction of straw. Accordingly, the maximum applicable feed pressure and volumetric straw throughput was determined as a function of column height, indicating that a 10 m column can be operated at a maximum feed pressure of 530 kPa, corresponding to an operation time of 50 min and a throughput of 163 kg m h . Biotechnol. Bioeng. 2016;113: 2605-2613. © 2016 Wiley Periodicals, Inc.

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Section: Limits Of Operability Of An Industrial Scale Columnmentioning

confidence: 87%

Section: Simulationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The effect of direct and counter‐current flow‐through delignification on enzymatic hydrolysis of wheat straw, and flow limits due to compressibility

Pihlajaniemi

Sipponen

Pastinen

et al. 2016

Biotech & Bioengineering

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“…All of these could improveits surface strength. To increase the bagasse pulp quality, the pith, the density of which is 220 kg/m 3 [17] should be depithed, as the cells of pith are usually in tiny shape (length < 0.4 mm) with thin wall [18]. Thus, after it has been treated by the depithing machine, most parenchyma cells were ruptured with fibrous bundle separated.…”

Section: The Morphology Analysismentioning

confidence: 99%

Copper (II) Removed from Aqueous Solutions by Aminated Bagasse Pith

Liu¹,

Nie²,

Wang³

2016

JRST

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ABSTRACT:The paper investigated the heavy metal ions adsorption by bio-adsorbent obtained from modifying bagasse pith. The bagasse pith, a main solid bio-waste from sugar and pulp industry, was treated by epichlorohydrin and diethylenetriamine. The pith before and after modification were analyzed to characterize its structure change by Fourier Transform Infrared Spectroscopy and Scanning Electron Microscope. It shown that numbers of minor fragments cohere to the surface of fibrous bundle of modified pith. The carboxyl groups has been introduced with the change of substitutional groups in aromatic skeletal of lignin on surface of pith. The kinetics and thermo-dynamic properties were studied. The results shown the adsorption process are well described by Langmuir isotherm and pseudo-2nd order model. It is considered that the bagasse pith, a renewable bio-waste, would be modified to treat the waste water polluted by heavy metal in further studies.

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“…The process of papermaking has remained basically intact since its beginning. A dilute suspension of fibers in water is prepared and evenly distributed on a fine mesh1. The water is removed through the mesh and the remaining fiber mat is pressed and dried.…”

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confidence: 99%

Comprehensive analysis of individual pulp fiber bonds quantifies the mechanisms of fiber bonding in paper

Hirn

Schennach

2015

Sci Rep

123

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The process of papermaking requires substantial amounts of energy and wood consumption, which contributes to larger environmental costs. In order to optimize the production of papermaking to suit its many applications in material science and engineering, a quantitative understanding of bonding forces between the individual pulp fibers is of importance. Here we show the first approach to quantify the bonding energies contributed by the individual bonding mechanisms. We calculated the impact of the following mechanisms necessary for paper formation: mechanical interlocking, interdiffusion, capillary bridges, hydrogen bonding, Van der Waals forces, and Coulomb forces on the bonding energy. Experimental results quantify the area in molecular contact necessary for bonding. Atomic force microscopy experiments derive the impact of mechanical interlocking. Capillary bridges also contribute to the bond. A model based on the crystal structure of cellulose leads to values for the chemical bonds. In contrast to general believe which favors hydrogen bonding Van der Waals bonds play the most important role according to our model. Comparison with experimentally derived bond energies support the presented model. This study characterizes bond formation between pulp fibers leading to insight that could be potentially used to optimize the papermaking process, while reducing energy and wood consumption.

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Pressure Filtration of Australian Bagasse Pulp

Cited by 14 publications

References 6 publications

The effect of direct and counter‐current flow‐through delignification on enzymatic hydrolysis of wheat straw, and flow limits due to compressibility

The effect of direct and counter‐current flow‐through delignification on enzymatic hydrolysis of wheat straw, and flow limits due to compressibility

Copper (II) Removed from Aqueous Solutions by Aminated Bagasse Pith

Comprehensive analysis of individual pulp fiber bonds quantifies the mechanisms of fiber bonding in paper

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