A Review of Recent Technological Advances in the Brightening of High‐Yield Pulps

Ni, Yonghao

doi:10.1002/cjce.5450830402

Cited by 18 publications

(7 citation statements)

References 9 publications

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“…The different stabilizers tested were mainly made of silica (Na2SiO3, V141, V268, and V287) except the poly-R-hydroxyacrylic acid. V268 and V287 contained EDTA, stabilizer well-known (19). According to the information found in the literature, co-stabilizers used with Na2SiO3 were urea, magnesium sulfate (MgSO4, 7H2O), dimethylenetriaminepentaacetic acid (DTPA), and sodium nitrate (NaNO3).…”

Section: Methodsmentioning

confidence: 99%

Treatment of Odorous Sulphur Compounds by Chemical Scrubbing with Hydrogen Peroxide - Stabilisation of the Scrubbing Solution

Charron

Couvert

Laplanche

et al. 2006

Environ. Sci. Technol.

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To slow down the hydrogen peroxide decomposition in basic aqueous conditions, the addition of stabilizers and co-stabilizers in the scrubbing solution was investigated. Results found with sodium silicate (Na2SiO3) were quite promising but several problems still remained. Based on these observations, this study focused on the research of a better stabilizer. Several ways were investigated: the use of silicate solutions employed in pulp industries, the addition of co-stabilizers to sodium silicate, or the use of an another stabilizer (the poly-alpha-hydroxyacrylic acid). Experiments revealed that the poly-alpha-hydroxyacrylic acid is the best stabilizing compound.

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Section: Methodsmentioning

confidence: 99%

Treatment of Odorous Sulphur Compounds by Chemical Scrubbing with Hydrogen Peroxide - Stabilisation of the Scrubbing Solution

Charron

Couvert

Laplanche

et al. 2006

Environ. Sci. Technol.

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“…Recently, however, the use of magnesium hydroxide has increased. Its advantages include lower generation of COD, higher light scattering coefficient and no need for stabilizers compared to when sodium hydroxide is used (Johnson et al 2002, Leduc et al 2008, Ni 2005, Ni and He 2010. One important difference is that magnesium hydroxide is not fully dissolved and thus is added as slurry.…”

mentioning

confidence: 99%

Mechanical Pulping: Peroxide-based ATMP refining of spruce: energy efficiency, fibre properties and pulp quality

Gorski

Mörseburg

Axelsson

et al. 2011

Nordic Pulp &Amp; Paper Research Journal

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SUMMARY:Pilot scale refining of White spruce using a modified TMP refining process (ATMP -Advanced Thermomechanical Pulp) was studied. ATMP combines selective wood disintegration by mechanical pretreatment and refining at elevated intensity with chemical treatment after defibration (in this study hydrogen peroxide, alone and in combination with alkali).The electrical energy efficiency and pulp quality using ATMP were evaluated and compared to a conventional TMP process. One goal was to retain the combination of optical properties and strength of typical TMP. Fibre properties (structural dimensions, external and internal fibre development) as well as the amount of split fibres resulting from TMP and ATMP processes were compared.The results indicate an electrical energy efficiency improvement potential of 0.65 MWh/odt (34%) at tensile index 30 N.m/g of ATMP compared to reference TMP. All ATMP pulps retained their TMP character, i.e. the relationships between light scattering coefficient, density, elongation properties and strength that are important for printing paper. ATMP had a significantly lower content of shives and higher external and internal fibre development compared to TMP at equal energy application. The long fibre fraction of ATMP also contained significantly higher amount of split fibres. The brightness of ATMP produced with addition of hydrogen peroxide (28 kg/odt) and magnesium hydroxide (14 kg/odt) was 14 ISO % higher compared to TMP.

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“…Polyvinylpyrrolidone maleic acid-styrene or propenes, co-polymers of butadiene-maleic acid, and grafted polymers are examples of polymeric stabilizers that have been reported in the literature. Hydroxyacrylate in peroxide bleaching has been reported to be an effective stabilizer for peroxide bleaching (Ni 2005;Wurorimaa et al 2006). The results show that silicate and PHAS have the highest peroxide stabilizing efficiency in terms of brightness and residual peroxide (Hamalainen et al 2007).…”

Section: Deinking Of Different Furnishes Of Recycled Mow Onp and Ommentioning

confidence: 99%

Deinking of Different Furnishes of Recycled MOW, ONP, and OMG Pulps in Silicate-Free Conditions Using Organic Complex of PHASS

2012

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Sodium silicate causes problems in papermaking such as deposit formation, decreased retention, and lower sheet strength. Due to these problems, chemical deinking of different recycled papers furnishes including 100% ONP, 80% ONP, and 20% OMG, and a combination of 70% ONP/ 20% OMG/ 10% MOW was accomplished using an organic complexing agent which included poly-hydroxyl acrylic acid and sodium salt (PHAAS) in silicate-free conditions. PHAAS was utilized at four levels of 0.3, 0.5, 0.7, and 1% (based on oven-dry weight of recycled paper) rather than sodium silicate. The optical and physical properties of deinked pulp were compared to control pulp (conventional deinking containing 2% sodium silicate). The results showed that the paper brightness was improved and the yellowness, dirt count, and dirt area were decreased significantly by increasing PHAAS charge up to 0.9%. Also, in different recycled paper furnishes above mentioned, using different charges of PHAAS had different effects on paper opacity. Using different charges of PHAAS (especially 0.7 to 0.9%) decreased paper caliper, increased paper air resistance, increased freeness, and gave similar or slightly better paper tear indices. Differences of tear indices were not significant at confidence level of 99%. Based on the present research, the use of 0.7 to 0.9% PHAAS in place of sodium silicate is advisable because of the better quality of final papers compared to conventional deinking process.

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A Review of Recent Technological Advances in the Brightening of High‐Yield Pulps

Cited by 18 publications

References 9 publications

Treatment of Odorous Sulphur Compounds by Chemical Scrubbing with Hydrogen Peroxide - Stabilisation of the Scrubbing Solution

Treatment of Odorous Sulphur Compounds by Chemical Scrubbing with Hydrogen Peroxide - Stabilisation of the Scrubbing Solution

Mechanical Pulping: Peroxide-based ATMP refining of spruce: energy efficiency, fibre properties and pulp quality

Deinking of Different Furnishes of Recycled MOW, ONP, and OMG Pulps in Silicate-Free Conditions Using Organic Complex of PHASS

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