Fractionation of process water in thermomechanical pulp mills

Persson, Thomas; Krawczyk, Holger; Nordin, Anna-Karin; Jönsson, Ann‐Sofi

doi:10.1016/j.biortech.2009.12.142

Cited by 44 publications

(38 citation statements)

References 18 publications

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“…The product stream consisted of 59% hemicellulose, where most was characterized as GGM, and the rest was characterized as 13% lignin, 7% ash, and 21% un-characterized matter remained as impurities. As in the work of Orsa et al (1997), Persson et al (2010) found that lignin accumulated in the fraction of the lowest molecular weight.…”

Section: Comparison To Other Means Of Bio-refining Norway Sprucesupporting

confidence: 57%

“…Persson et al (2010) investigated the isolation of GGM through pure sterical means; in a sequence of drum-, micro-, ultra-and nano-filtration. The work of Persson et al (2010) differs from the above, as they applied the separation directly on the process stream of an existing TMP plant. Process water was extracted at the disc filters downstream of the refiners.…”

Section: Comparison To Other Means Of Bio-refining Norway Sprucementioning

confidence: 99%

“…Investigations of various means of filtration to obtain hemicelluloses from thermomechanical pulp (TMP) process waters have been performed by Persson et al (2010) and Andersson et al (2007), resulting in a maximum purity of saccharide content of about 80 %. Lawoko et al (2006) report a precipitative scheme for obtaining four fractions of LCC from ball-milled wood that differ by sugar composition.…”

Section: Introductionmentioning

confidence: 99%

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Separation of Galactoglucomannans, Lignin, and Lignin-Carbohydrate Complexes From Hot-Water-Extracted Norway Spruce by Cross-Flow Filtration and Adsorption Chromatography

Westerberg¹,

Sunner²,

Helander³

et al. 2012

BioResources

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A simple method to simultaneously recover polymeric carbohydrates, mainly galactoglucomannans (GGM), lignin, and lignin-carbohydrate complex (LCC) from hot-water-extracted Norway spruce wood is presented. The isolation method consists of cross-flow filtration, where high and low molecular mass species are removed, followed by fixedbed adsorption on a hydrophobic polymeric resin (XAD-16) to remove lignins and lignans. In the second step of fixed-bed adsorption, a phenylic reversed-phase analytical chromatography column, where mass transport resistance is minimized and a very high selectivity towards aromatic compounds have been observed, was used to separate LCC from GGM. The isolated LCC fraction contained about 10% aromatics, whereas the upgraded GGM fraction contained about 1.5% aromatics and the lignin fraction contained about 56% aromatics. Polymeric xylan was accumulated in the GGM fraction, while mannose was the dominant sugar found in the LCC fraction. As products, approximately 7% was recovered in the lignin fraction in the first adsorptive step, 5% was recovered as LCC, and 88% as upgraded hemicelluloses.

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Section: Comparison To Other Means Of Bio-refining Norway Sprucesupporting

confidence: 57%

Section: Comparison To Other Means Of Bio-refining Norway Sprucementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Separation of Galactoglucomannans, Lignin, and Lignin-Carbohydrate Complexes From Hot-Water-Extracted Norway Spruce by Cross-Flow Filtration and Adsorption Chromatography

Westerberg¹,

Sunner²,

Helander³

et al. 2012

BioResources

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“…Membrane processes are the only environmentally and energy-sustainable option for concentrating and purifying substances in such diluted solutions. Laboratory experiments on the extraction of GGM from TMP process water using membrane processes have yielded promising results, [9,10] and on-site trials of GGM recovery on the kgscale have been conducted to produce GGM for research purposes. [3] However, to the best of our knowledge, no results have been published from pilot-scale filtration experiments conducted during on-site GGM recovery.…”

Section: Introductionmentioning

confidence: 99%

On-Site Recovery of Hemicelluloses from Thermomechanical Pulp Mill Process Water by Microfiltration and Ultrafiltration

Thuvander¹,

Lipnizki²,

Jönsson³

2019

Journal of Wood Chemistry and Technology

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During mechanical defibration of wood, a minor fraction of the wood mass is dissolved in the process water. These dissolved substances represent an extra energy demand when they are treated in the mill's wastewater treatment plant. Galactoglucomannan, the main hemicellulose in spruce, can be recovered from thermomechanical pulp mill process water by a process based on microfiltration (MF) and ultrafiltration (UF). The purpose of this work was to study the scale-up of the process from laboratory scale to continuous industrial scale. MF was first studied in the laboratory, and then combined with UF in a continuous pilot process on-site at a pulp mill. The data obtained were used to estimate the cost of the membrane processes for galactoglucomannan recovery which was found to be about e1160 per ton hemicelluloses.

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“…Rice straw can be easily pulped with an alkali-oxygen method (Persson et al 2010), which can largely reduce the silica content of the BL from straw at its end point of pulp reaction when the pH of BL is below 10 (Chen and Hayashi 1997), with the silica content being less than 0.5 g/L in the resultant BL (Chen and Hayashi 1999). But, for traditional pulp such as Soda-AQ, since the high silicon content, the viscosity of the resultant BL increase rapidly once evaporated to approximately 44% of the solids concentration (Zhang et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Effects of pH and Suspended Matter on the Physico-Chemical Properties of Black Liquor from Alkali-Oxygen Pulping of Rice Straw

Zhang¹

2016

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Black liquor (BL) can be regarded as the energy and alkali resource of the pulping mill. In this work, the effects of the characteristics of black liquor derived from the alkali-oxygen pulping of rice straw were studied. Through analyses of the chemical and physical properties, especially the thermodynamics properties, which depend on suspended matter and alkalinity, it was shown that the removal of the suspended matter from the black liquor could effectively improve its thermodynamic properties, particularly in making its solids content reach up to more than 56% at the turning point of its viscosity. Moreover, sodium salt played an important role in the presence of macromolecules and silica in the BL. When the BL was adjusted to pH = 11 with NaOH, the filtered BL had the lowest silica content, the highest volumetric isothermal expansivity (VIE), was more susceptibility to thermal cracking, and was more suitable for processing for alkali recovery.

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Fractionation of process water in thermomechanical pulp mills

Cited by 44 publications

References 18 publications

Separation of Galactoglucomannans, Lignin, and Lignin-Carbohydrate Complexes From Hot-Water-Extracted Norway Spruce by Cross-Flow Filtration and Adsorption Chromatography

Separation of Galactoglucomannans, Lignin, and Lignin-Carbohydrate Complexes From Hot-Water-Extracted Norway Spruce by Cross-Flow Filtration and Adsorption Chromatography

On-Site Recovery of Hemicelluloses from Thermomechanical Pulp Mill Process Water by Microfiltration and Ultrafiltration

Effects of pH and Suspended Matter on the Physico-Chemical Properties of Black Liquor from Alkali-Oxygen Pulping of Rice Straw

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