Alkaline xylan extraction of bleached kraft pulp - effect of extraction time on pulp chemical composition and physical properties

TAPPI Journal ◽  
2012 ◽  
Vol 11 (4) ◽  
pp. 37-43 ◽  
Author(s):  
ESA SAUKKONEN ◽  
KATJA LYYTIKÄINEN ◽  
KAJ BACKFOLK
Keyword(s):  
Kraft Pulp ◽  
Pilot Trial ◽  
Mechanical Damage ◽  
Pilot Scale ◽  
Extraction Time ◽  
Similar Amount ◽  
Alkaline Extraction ◽  
Paper Properties ◽  
Bleached Kraft Pulp ◽  
Birch Kraft Pulp

In this pilot scale study, we examined the effects of alkaline extraction time on xylan removal, pulp and paper properties, and the consequences that need to be addressed when scaling up and intensifying the process. Alkaline extraction of bleached birch kraft pulp yields two fractions: pure polymeric xylan and pulp with reduced xylan content. Our results indicate that a similar amount of xylan can be extracted in 5 min as the amount obtained in 60 min. We found, however, that the shorter extraction time is beneficial to maintain the fiber and paper properties at an acceptable level. This pilot trial demonstrated that the washing procedure of the alkali-treated fibers must be selected with care to avoid causing mechanical damage to fibers and to avoid the loss of fines.

Effect of reduced pulp xylan content on wet end chemistry and paper properties — a pilot scale study

TAPPI Journal ◽  
2014 ◽  
Vol 13 (2) ◽  
pp. 29-37 ◽  
Author(s):  
KATJA LYYTIKÄINEN ◽  
ESA SAUKKONEN ◽  
MARKKU VÄISÄNEN ◽  
JUSSI TIMONEN ◽  
KAJ BACKFOLK
Keyword(s):  
Kraft Pulp ◽  
Scale Up ◽  
Pilot Scale ◽  
Partial Replacement ◽  
Paper Machine ◽  
Charge Balance ◽  
Paper Properties ◽  
Birch Kraft Pulp ◽  
Positive Effect ◽  
Xylan Content

In this scale-up study, we examined the effects of using varying amounts of fibers with reduced xylan content in paper. Bleached birch kraft pulp was partially or fully replaced by alkali-extracted pulp, and the effects of this replacement on the wet end chemistry of the paper machine and the resulting paper properties were determined. Our results show that paper properties can be maintained or improved when optimizing the partial replacement of bleached birch kraft pulp with alkali-extracted pulp. The incorporation of alkali-extracted pulp in paper machine stock had a positive effect on first pass retention and retention of chemicals. However, careful optimization of chemical dosages is required because of the altered charge balance in the wet end.

scholarly journals A comparative study of enzymatic and Fenton pretreatment applied to a birch kraft pulp used for MFC production in a pilot scale high-pressure homogenizer

TAPPI Journal ◽  
2016 ◽  
Vol 15 (6) ◽  
pp. 375-381
Author(s):  
PIA HELLSTROM ◽  
ANETTE HEIJNESSON-HULTEN ◽  
MAGNUS PAULSSON ◽  
HELENA HAKANSSON ◽  
ULF GERMGARD
Keyword(s):  
High Pressure ◽  
Kraft Pulp ◽  
Pilot Scale ◽  
Enzymatic Method ◽  
Size Fractionation ◽  
Homogenization Treatment ◽  
Betula Verrucosa ◽  
High Pressure Homogenizer ◽  
Birch Kraft Pulp ◽  
Number Of Passes

Microfibrillated cellulose (MFC) was produced in pilot scale from a bleached birch (Betula verrucosa) kraft pulp that was pretreated with either Fenton’s reagent or with a combined mechanical and enzymatic method used at the Centre Technique du Papier (CTP; Grenoble, France). The change in fiber fibrillation during the homogenization treatment was monitored by analyzing the fiber and the fines content, size fractionation, rheological properties and visualization by light- and scanning electron microscopy (SEM). The Fenton pretreatment resulted in MFC suspensions that contained a high amount of small sized elements. After five passes through the highpressure homogenizer, the amount of particles smaller than 20 μm was 37% for the Fenton pretreated MFC compared to 13% for the enzymatically (endoglucanase) pretreated MFC. Altogether, the Fenton pretreatment enabled preparation of MFC with a higher degree of fibrillation after the same number of passes through the high-pressure homogenizer. Another option is to produce MFC of the same amount of fibrillation as after an enzymatic stage, but at significantly lower energy consumption.

scholarly journals PATI TERMODIFIKASI ENZIMATIS SEBAGAI KOMPONEN PEREKAT BAHAN SALUT KERTAS CETAK

2016 ◽  
Vol 2 (01) ◽  
Author(s):  
Nina Elyani ◽  
Jenni Rismijana ◽  
Teddy Kardiansyah ◽  
Cucu ,
Keyword(s):  
Kraft Pulp ◽  
Paper Industry ◽  
Dry Weight ◽  
Modified Starch ◽  
Cationic Starch ◽  
Water Penetration ◽  
Paper Properties ◽  
Bleached Kraft Pulp ◽  
Base Paper ◽  
Printing Paper

This research has been conducted through several steps. Step I was base papermaking using 80% LBKP and 20 % NBKP. They were refine separately up to 300 ml CSF, then mixed with 15% CaCO3, 0.6% AKD, 0.5% poliacrylamide, and 1,5% cationic starch to dry-weight of fibers. Step II was modifying starch enzymaticaly at 70-75°C, pH 6.5 - 7.0, amylase 0,05% for 15 minutes. Step III was base-paper coating with varied adhesives. Variation I use natural starch, Variation II use enzymatic modified starch, Variation III use commercial starch each of 8%. Testing for the handsheets comprise of brightness, roughtness, picking strength, water penetration, and pH. The results showed that the viscosity for natural starch, enzymatic starch and commercial starch respectively at 8000 cPs, 26 cPs and 114 cPs. The use of enzymatic modified starch give the best paper properties. The experiments has replicated in a laboratory of paper industry, with the same results, using clay and CaCO3 at 40:60 ratio, enzymatic starch, commercial starch, and natural starch.Keywords: starch, coated printing paper, amylase, viscosity.  ABSTRAK Penelitian ini dilakukan melalui beberapa tahapan. Tahap I adalah pembuatan kertas dasar dengan menggunakan bahan baku 80% serat pendek atau leaf bleached kraft pulp (LBKP) dan 20% serat panjang atau needle bleached kraft pulp ( NBKP) digiling secara terpisah hingga mencapai derajat giling 300 ml CSF. Selanjutnya pulp dicampur ke dalam bahan kimia yang terdiri 15 % CaCO3, 0,6% AKD, 1,5% pati kationik dan Poliakrilamida sebesar 0,5% terhadap berat kering pulp. Lembaran dibuat pada gramatur 60 g/m2. Tahap II adalah pembuatan pati termodifikasi enzimatis pada kondisi inkubasi suhu sekitar 70 – 75oC, pH : 6,5 – 7,0, waktu selama 15 menit dengan penambahan amilase sebesar 0,05%. Tahap III adalah proses penyalutan kertas dasar dengan pati termodifikasi enzimatis, sebagai pembanding menggunakan pati alam maupun pati komersial. Kemudian dilakukan pengujian terhadap lembaran yang dihasilkan meliputi : derajat putih, kekasaran, penetrasi minyak, ketahanan cabut, daya serap air dan pH. Selanjutnya dilakukan uji coba di industri dengan komposisi pigmen kaolin dan kalsium karbonat 40 : 60 menggunakan pati enzim, pati komersial, dan pati alam. Hasil percobaan menunjukkan bahwa viskositas untuk pati alam, pati enzim dan pati komersial masing-masing adalah sebasar 8000 cPs, 26 cPs dan 114 cPs. Penggunaan pati modifikasi enzim memberikan sifat kertas yang paling baik. Hasil replikasi percobaan di laboratorium industri, pati enzim juga menghasilkan sifat kertas yang lebih baik.Kata kunci: pati, kertas cetak salut, amilase, viskositas.  

Xylooligosaccharides production by acid hydrolysis of an alkaline extraction filtrate from Eucalyptus globulus bleached kraft pulp

2021 ◽  
Vol 159 ◽  
pp. 113066
Author(s):  
Patrícia Henriques ◽  
Marta Martinho ◽  
Maria de Lurdes Serrano ◽  
António P. Mendes de Sousa ◽  
Ana Maria Brites Alves
Keyword(s):  
Acid Hydrolysis ◽  
Eucalyptus Globulus ◽  
Kraft Pulp ◽  
Alkaline Extraction ◽  
Bleached Kraft Pulp ◽  
Hydrolysis Of

scholarly journals The effect of hemicellulose extraction on fiber charge properties and retention behavior of kraft pulp fibers

BioResources ◽  
2010 ◽  
Vol 6 (1) ◽  
pp. 219-231
Author(s):  
Katja Lyytikäinen ◽  
Esa Saukkonen ◽  
Isko Kajanto ◽  
Jari Käyhkö
Keyword(s):  
Surface Charge ◽  
Kraft Pulp ◽  
Paper Industry ◽  
Fiber Surface ◽  
Pulp Fibers ◽  
Paper Properties ◽  
Bleached Kraft Pulp ◽  
Filler Retention ◽  
Anionic Groups ◽  
Generation Technology

The integrated forest biorefinery (IFBR) concept provides a promising opportunity for the development of the pulp and paper industry. One proposed next generation technology for an integrated forest biorefinery is the extraction of hemicelluloses, allowing the co-production of pulp and different hemicellulose-based chemicals. In addition to paper properties, hemicelluloses are known to be important for the function of cationic papermaking additives, because they are the main source of charged groups in fibers. This paper shows that the alkaline extraction of hemicelluloses from bleached kraft pulp decreases both the total and surface charge of the pulps. It was found that the decreased fiber charge leads to increased filler retention with fixed retention aid dosage. The reduction observed in the fiber surface charge for alkali-extracted pulp was mainly attributed to the decrease in the amount of anionic groups located in fines.

scholarly journals EFFECT OF ADDITION OF DEINKED PULP TO BLEACHED KRAFT PULP ON TISSUE PAPER PROPERTIES

Wood Research ◽  
2021 ◽  
Vol 66 (3) ◽  
pp. 505-516
Author(s):  
Monika Stankovská ◽  
Mária Fišerová ◽  
Juraj Gigac ◽  
Elena Opálená
Keyword(s):  
Water Absorption ◽  
Kraft Pulp ◽  
Kraft Pulps ◽  
Initial Water ◽  
Paper Properties ◽  
High Brightness ◽  
Tissue Paper ◽  
Tensile Index ◽  
Bleached Kraft Pulp ◽  
Eucalyptus Kraft Pulp

The influence of addition of deinked pulps with low and high brightness to bleached eucalyptus and pine kraft pulps on functional tissue paper properties was studied. Deinked pulps with low and high brightness had some different functional properties. Deinked pulp with high brightness has higher bulk, porosity, water absorption after immersion, initial water absorption, bulk softness as well as brightness. On the contrary, the difference in relative bonded area and porosity e between deinked pulps with low and high brightness was moderate. The mixed pulps laboratory pulp sheets from bleached eucalyptus kraft pulp or bleached pine kraft pulp with addition of 20, 40 and 80% of deinked pulp with low brightness or deinked pulp with high brightness were prepared. The addition of the deinked pulp with high or low brightness to bleached kraft pulp leads to increasing of bulk, bulk softness as well as high water absorption after immersion and initial water absorption. The tensile index rapidly decreased by the addition of deinked pulps with high brightness to bleached eucalyptus and pine kraft pulps. Similarly, the addition of deinked pulp with low brightness to bleached pine kraft pulp led to rapid decreasing of tensile index. On contrary, with the addition of deinked pulp with low brightness to eucalyptus kraft pulp, the decreasing of tensile index was less pronounced. Mixed pulp from bleached eucalyptus kraft pulp with a small content of deinked pulp with low brightness with functional properties suitable for production of tissue papers was found as optimal.

Optimization of elemental chlorine-free bleaching for a softwood kraft pulp • part 2: economic analysis of chemical and steam consumption

TAPPI Journal ◽  
2010 ◽  
Vol 9 (9) ◽  
pp. 47-53 ◽  
Author(s):  
BRIAN N. BROGDON
Keyword(s):  
Chlorine Dioxide ◽  
Previous Investigation ◽  
Kraft Pulp ◽  
Energy Costs ◽  
Alkaline Extraction ◽  
Stage Versus ◽  
Kraft Pulps ◽  
Steam Consumption ◽  
Elemental Chlorine ◽  
Softwood Kraft Pulp

Our previous investigation [1] re-analyzed the data from Basta and co-workers (1992 TAPPI Pulping Conference) to demonstrate how oxidative alkaline extraction can be augmented and how these changes affect chlorine dioxide consumption with elemental chlorine-free (ECF) sequences. The current study manipulates extraction delignification variables to curtail bleaching costs with a conventional U.S. Southern softwood kraft pulp. The economic advantages of ~0.35% to 0.65% H2O2 peroxide reinforcement in a 70°C (EOP)-stage versus 90°C (EO)-stage are predisposed to the brightness targets, to short or long bleach sequences, and to mill energy costs. Minimized bleaching costs are generally realized when a 90°C (EO) is employed in D0(EO)D1 bleaching, whereas a 70°C (EOP) is economically advantageous for D0(EOP)D1E2D2 bleaching. The findings we disclose here help to clarify previous ECF optimization studies of conventional softwood kraft pulps.

Desorption of Cationic Polyacrylamide from Bleached Kraft Pulp Fibers

1987 ◽  
Vol 19 (5-6) ◽  
pp. 939-951 ◽  
Author(s):  
Clifton F. Warren ◽  
R. Gehr
Keyword(s):  
Adsorption Isotherm ◽  
Total Nitrogen ◽  
Kraft Pulp ◽  
Detection System ◽  
Cationic Polyelectrolyte ◽  
Chemiluminescence Detection ◽  
Pulp Fibers ◽  
Paper Manufacturing ◽  
Bleached Kraft Pulp ◽  
Receiving Water

The adsorption and desorption behaviour of a cationic polyelectrolyte contacted with wood pulp fibers was determined by total nitrogen analysis using a pyrolysis/chemiluminescence detection system. Dialysed polymer generated an adsorption isotherm of higher affinity than did non-dialysed polymer. Capacity adsorption was maximized at pH 7, but decreased in the presence of alum depending on the dosage. Desorption of non-dialysed polymer was caused by changes in pH above or below 7.0 as well as by addition of alum. However for the alum doses typically encountered in paper manufacturing, significant desorption is unlikely. Nevertheless, the contaminants in non-dialysed polymers do hinder adsorption, and effluents from those processes using both alum and polymer may contain quantities of unadsorbed or desorbed polyelectrolytes which could be damaging to receiving water bodies.

Characterization of odorous compounds from bleached kraft pulp mill effluent

1995 ◽  
Vol 31 (11) ◽  
pp. 35-40 ◽  
Author(s):  
B. G. Brownlee ◽  
S. L. Kenefick ◽  
G. A. MacInnis ◽  
S. E. Hrudey
Keyword(s):  
Gas Chromatography ◽  
Kraft Pulp ◽  
Pulp Mill ◽  
Dimethyl Disulfide ◽  
Gas Chromatography Mass Spectrometry ◽  
Pulp Mill Effluent ◽  
Kraft Pulp Mill ◽  
Bleached Kraft Pulp ◽  
Methyl Phenyl Sulfide ◽  
Library Spectrum

Odour compounds in extracts of bleached kraft pulp mill effluent (BKME) have been characterized by olfactory gas chromatography (OGC) and gas chromatography-mass spectrometry. A variety of sulfury odours was detected by OGC in addition to woody and pulp mill-like odours. Three sulfur compounds were identified by comparison of retention times and partial mass spectra with authentic standards: dimethyl disulfide, 3-methylthiophene and thioanisole (methyl phenyl sulfide). Typical concentrations in BKME were 1, 0.05, and 0.5 μg/l, respectively. Their odour intensity is relatively low and they were not detected by OGC. Dimethyl trisulfide was tentatively identified by comparison of its partial mass spectrum with a literature (library) spectrum. Its concentration in BKME was estimated at 0.5-2 μg/l. It corresponded to a skunky odour in the OGC profiles. Efforts to identify another odour peak, eluting just after 3-methylthiophene, with a pronounced alkyl sulfide odour were unsuccessful.

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