scholarly journals The Effect of Soda Pulping Variables on Pulp Properties of Coir Fiber

2020 ◽  
Vol 3 (2) ◽  
pp. 170
Author(s):  
Maria Ulfa ◽  
Koriatul Isnaini
Keyword(s):  
Kappa Number ◽  
Pulp Yield ◽  
Cellulose Content ◽  
Coir Fiber ◽  
Residual Lignin ◽  
Coir Fibers ◽  
Soda Pulping ◽  
Pulp Properties ◽  
High Alkali ◽  
Potential Use

Abstract The potential use of coir fiber for pulping and papermaking has been investigated. This research aimed to study effects of pulping processing variables (temperature, pulping time, and alkali charge/solvent pulping) on the properties of pulp (residual lignin, alpha cellulose, kappa number and pulp yield) from coir fiber. For this purpose, the coir fibers were cooked using alkali charge (10 to 20% oven dried, as NaOH), pulping time from 60 to 120 min and temperature from 65 to 180oC. Results indicated that alkali charge and pulping time gave more impact on the properties of pulp than temperature. Pulping at high temperature, long pulping time, and high alkali charge resulted in decreasing of lignin, pulp yield, and kappa number but instead on alpha cellulose content. Keywords: coir, soda pulping, lignin

scholarly journals Potassium hydroxide pulping of four non-woods

2018 ◽  
Vol 53 (1) ◽  
pp. 1-6 ◽  
Author(s):  
S Sutradhar ◽  
M Sarkar ◽  
J Nayeem ◽  
M Sarwar Jahan ◽  
C Tian
Keyword(s):  
Wheat Straw ◽  
Potassium Hydroxide ◽  
Raw Materials ◽  
Kappa Number ◽  
Pulp Yield ◽  
Optimum Conditions ◽  
Corchorus Capsularis ◽  
Sesbania Bispinosa ◽  
Soda Pulping ◽  
Good Substitute

Four non-woods such as, dhaincha (Sesbania bispinosa), jute stick (Corchorus capsularis), wheat straw (Triticum aestivum) and corn stalks (Zea mays) were cooked by potassium hydroxide (KOH) at the optimum conditions of soda pulping. Dhaincha, wheat straw and corn stalks were delignified to kappa number 19.4, 13.6 and 19, respectively, while jute stick was not delignified sufficiently (kappa number 32.5). All these four raw materials maintained good yield in KOH process. Dhaincha produced the highest pulp yield (50.5%) and wheat straw had the lowest pulp yield (44.7). All pulps were bleached by D0EpD1 bleaching sequences in identical bleaching conditions. Final pulp brightness reached to above 80% ISO except jute stick pulp. Jute stick pulp reached to 74.9% brightness only after the consumption of 30 kg ClO2/ ton of pulp. The overall bleaching yields were 92.6%, 88.4%, 90.1 and 90.8% for dhaincha, jute stick, wheat straw and corn stalks pulps, respectively. The oSR of these four non-wood bleached pulps was above 20, consequently improved papermaking in the unrefined state. Beating rapidly increased papermaking properties, as for example, the tensile index of dhaincha pulps increased from 49 N.m/g in the unrefined pulp to 90 N.m/g in the beaten 50 oSR. It can be seen that KOH is a good substitute to soda process for non-wood.Bangladesh J. Sci. Ind. Res.53(1), 1-6, 2018

Optimization of soda pulping process of ligno-cellulosic residues of lemon and sofia grasses produced after steam distillation

BioResources ◽  
2010 ◽  
Vol 6 (1) ◽  
pp. 103-120
Author(s):  
Harjeet Kaur ◽  
Dharm Dutt ◽  
C. H. Tyagi
Keyword(s):  
Steam Distillation ◽  
Strength Properties ◽  
Kappa Number ◽  
Pulp Yield ◽  
Lemon Grass ◽  
Cymbopogon Flexuosus ◽  
Cooking Temperature ◽  
Soda Pulping ◽  
Lignocellulosic Residue ◽  
Better Than

Sofia (Cymbopogon martini), and lemon (Cymbopogon flexuosus) grasses, are exclusively cultivated for extraction of important lemongrass and palma rosa oils. Lignocellulosic residue (LCR) of sofia and lemon grasses left after steam distillation can successfully be used for the production of chemical grade pulp. Steam distillation mitigates the problem of mass transfer, and facilitates the faster penetration of cooking liquor by leaching out a part of extraneous components. Sofia grass produces a pulp yield of 43.7% of kappa number 20 at an active alkali dose of 14% (as Na2O), maximum cooking temperature of 160 oC and cooking time 90 min. Likewise, lemon grass produces a pulp yield of 41.4% of kappa number 12.5 under the same conditions except temperature (150 oC) by a soda pulping process. Addition of 0.1% AQ at optimum cooking conditions reduces kappa number by 26 and 8% for sofia and lemon grasses with insignificant increase in pulp yield i.e. 0.2 and 0.4% for sofia and lemon grasses, respectively. The mechanical strength properties of lemon grass soda-AQ pulp are better than sofia grass. Bauer-McNett fiber classification further validates that +20 fractions are more (62.63%) in lemon grass than in sofia grass (42.72%).

scholarly journals Ethylenediamine in alkaline cooking of jute stick for producing dissolving pulp

2015 ◽  
Vol 50 (1) ◽  
pp. 7-14
Author(s):  
M Sarwar Jahan ◽  
Halima Rahman ◽  
Purabi Rani Samaddar ◽  
Mostafizur Rahman
Keyword(s):  
Kappa Number ◽  
Dissolving Pulp ◽  
Pulp Yield ◽  
Cellulose Content ◽  
The Sacrifice ◽  
Cooking Liquor ◽  
Ecf Bleaching

Jute stick is the woody portion of jute plant. It remains as the leftover after extracting the fibre. The ratio of the stick to fibre is about 2.5:1. For producing dissolving pulp, prehydrolysis is carried out prior to pulping to remove hemicelluloses from the lignocelluloses. In this investigation ethylenediamine (EDA) was used with the cooking liquor to remove hemicelluloses from the jute stick. Increasing EDA charge in soda and kraft liquor decreased pentosans content in the pulp. EDA in kraft liquor showed lower kappa number and pentosans content than in the soda-liquor. Prehydrolysis further improved cellulose content and kappa number of jute stick pulp with the sacrifice of pulp yield. The bleachability of soda-EDA pulp was inferoior to the kraft-EDA and prehydrolysed soda-EDA in ECF bleaching sequences. The final brightness of soda-EDA pulp was 85.1% and kraft-EDA pulp 89.7%. Degraded cellulose (R18-R10) in soda-EDA and kraft-EDA pulps was lower than prehydrolysed pulps. Dissolving pulp can be produced to 93% purity without prehydrolysis by reinforcing EDA in kraft liquor.Bangladesh J. Sci. Ind. Res. 50(1), 7-14, 2015

scholarly journals Optimization of a Laccase-Mediator Stage for TCF Bleaching of Flax Pulp

Holzforschung ◽  
2003 ◽  
Vol 57 (5) ◽  
pp. 513-519 ◽  
Author(s):  
O. García ◽  
S. Camarero ◽  
J. F. Colom ◽  
Á. T. Martínez ◽  
M. J. Martínez ◽  
...  
Keyword(s):  
Reaction Time ◽  
Pressure Level ◽  
Kappa Number ◽  
Operating Conditions ◽  
Pycnoporus Cinnabarinus ◽  
Mediator System ◽  
Soda Pulping ◽  
Pulp Properties ◽  
Effect Of Oxygen ◽  
High Pressure Level

SummaryFlax pulp obtained by anthraquinone-soda pulping, resulting in a kappa number of 11.1, a viscosity of 950 ml/g and 36.7% ISO brightness, was bleached in a totally chlorine-free sequence using the enzyme laccase from the fungusPycnoporus cinnabarinusand 1-hydroxybenzotriazole (HBT) as redox mediator (stage L), followed by a hydrogen peroxide stage (P). The laccase treatment was optimized using a three-variable sequential statistical plan over the following ranges: 1–20 U/g o.d.p. (oven-dried pulp) laccase dose, 0.5–7.5% o.d.p. HBT dose and 1–24 h reaction time. The influence of these variables on several pulp properties after the P stage of the LP sequence was examined. The models defined from the results obtained predicted variations in ISO brightness, viscosity and kappa number of 57.6–74.8%,590–955 ml/g and 0–6.2, respectively. The variables most strongly influencing these pulp properties were found to be the reaction time and the enzyme dose. A compromise was adopted as regards the operating conditions in order to ensure optimum results. The study was completed by conducting a biobleaching assay in a pressurized reactor (590 kPa) to assess the effect of oxygen pressure. The high pressure level resulted in improved pulp properties by the laccase-mediator system.

Oxygen delignification of conventional and high alkali cooked softwood Kraft pulps, and study of the residual lignin structure

RSC Advances ◽  
2014 ◽  
Vol 4 (34) ◽  
pp. 17469-17477 ◽  
Author(s):  
Vahid Jafari ◽  
Sara R. Labafzadeh ◽  
Alistair King ◽  
Ilkka Kilpeläinen ◽  
Herbert Sixta ◽  
...  
Keyword(s):  
Kinetic Data ◽  
Kappa Number ◽  
Kraft Pulps ◽  
Residual Lignin ◽  
Oxygen Delignification ◽  
High Alkali ◽  
Lignin Structure

Elucidation of the structure of the residual lignin of high kappa number softwood pulps combined with kinetic data from O-delignification.

Polyhydric Alcohol Pulping at Atmospheric Pressure: An Effective Method for Organosolv Pulping of Softwoods

Holzforschung ◽  
1999 ◽  
Vol 53 (4) ◽  
pp. 411-415 ◽  
Author(s):  
Yasumitsu Uraki ◽  
Yoshihiro Sano
Keyword(s):  
Mechanical Properties ◽  
Atmospheric Pressure ◽  
Kraft Pulp ◽  
Kappa Number ◽  
Polyhydric Alcohol ◽  
Sodium Chlorite ◽  
Cellulose Content ◽  
Residual Lignin ◽  
Bleached Pulp ◽  
Very High

Summary Polyhydric alcohol pulping was developed to separate components of low-quality softwoods that are produced by thinning and improvement cutting as well as to establish a self-supporting pulping system. Propylene glycol (PG) was superior to ethylene glycol (EG) as solvent for polyhydric alcohol pulping at atmospheric pressure. PG pulping of fir, larch and cedar, with sulfuric acid as a catalyst, gave satisfactory pulps with few rejects and a very low level of residual lignin as compared with EG pulping. The PG pulps were readily bleached to approximately Kappa number 1 and 80% brightness by one treatment with sodium chlorite. The yield of bleached pulp from fir was 44.7% based on chips. The bleached pulps had very high α-cellulose content and crystallinity, and their mechanical properties were similar to those of kraft pulp. Therefore, polyhydric alcohol pulping appears to be promising for pulping of softwoods by an organosolv method.

scholarly journals Comparative Studies of Pulping of Jute Fiber, Jute Cutting and Jute Caddis

1970 ◽  
Vol 42 (4) ◽  
pp. 425-434 ◽  
Author(s):  
M Sarwar Jahan ◽  
A Al-Maruf ◽  
MA Quaiyyum
Keyword(s):  
Comparative Studies ◽  
Raw Materials ◽  
Lignin Content ◽  
Kappa Number ◽  
Dissolving Pulp ◽  
Jute Fiber ◽  
Pulp Yield ◽  
Pulp Fiber ◽  
Cellulose Content ◽  
Kraft Process

Comparative studies of retted jute fiber, jute cuttings and jute caddis were carried out in producing dissolving and paper grade pulp. Fiber length of jute fiber was longer than jute cutting and caddis. Klason lignin content was lower and α-cellulose content higher in jute fiber than cuttings and caddis. Extractives content in caddis was higher than jute fiber and cuttings. Pulping of these raw materials was done in soda-anthraquinone process. Higher pulp yield and lower kappa number was observed in jute fiber than that of jute cuttings and caddis. Jute fiber pulp showed better papermaking properties than jute cuttings and caddis. The tear index of these raw materials was similar to softwood. The bleachability of jute fiber pulp was also better than that of cuttings and caddis. These three raw materials were also evaluated in producing dissolving pulp by prehydrolysed kraft process. Pulp yield and bleachability was higher and kappa number lower for jute fiber than jute cuttings and caddis, but α-cellulose, S10 and S18 values and viscosity were almost similar in these three raw materials. Keywords: Jute fiber, Jute cuttings, Jute caddis, Paper grade pulp, Dissolving pulp Bangladesh J. Sci. Ind. Res. 42(4), 425-434, 2007

Diethanolamine Pulping Process of Pinus Kesiya

2013 ◽  
Vol 291-294 ◽  
pp. 347-350 ◽  
Author(s):  
Hao Liang Xiang ◽  
Jie He
Keyword(s):  
Physical Properties ◽  
Kappa Number ◽  
Maximum Temperature ◽  
Pulp Yield ◽  
Tensile Index ◽  
Pinus Kesiya ◽  
Pulp Properties

In this paper, under the premise of maximum temperature not more than 200 °C, the diethanolamine pulping process of pinus kesiya was optimized. AQ was used as the additive for pulping. Under the optimum pulping condition, the pulp properties were as follows: screened pulp yield 61.9%, viscosity 1306mL•g-1 and kappa number 24.3. The handsheets physical properties were as follows: tensile index 77.6N•m•g-1, bursting index 6.40kPa•m2•g-1, tearing index 10.63mN•m2•g-1

Chemical, anatomical, and technology aspects of Eucalyptus benthamii and Eucalyptus dunii for use in an integrated pulp and paper mill

TAPPI Journal ◽  
2015 ◽  
Vol 14 (2) ◽  
pp. 73-81 ◽  
Author(s):  
GISELY SAMISTRARO ◽  
PETER W. HART ◽  
JORGE LUIZ COLODETTE ◽  
RICARDO PAIM
Keyword(s):  
Energy Levels ◽  
Black Liquor ◽  
Basic Density ◽  
Paper Mill ◽  
Frost Tolerance ◽  
Strength Properties ◽  
Kappa Number ◽  
Pulp Yield ◽  
Chemical Compositions ◽  
Physical Strength

Eucalyptus dunii has been commercially used in southern Brazil because of its relatively good frost tolerance and adequate productivity in the winter months. More recently, interest has grown in cultivating Eucalyptus benthamii Maiden & Cambage, which presents even superior frost tolerance compared to E. dunii and is highly productive as well. The quality of E. benthamii for pulp production is not yet proven. Thus, the chemical, anatomical, and technological aspects of pulp made from E. benthamii were compared with those of E. dunii for unbleached paper production. Samples of E. benthamii chips were obtained and analyzed for their basic density, chemical composition, higher heating value, trace elemental analysis, and chip size distribution. The chips were kraft cooked using conditions that produced a 74 ± 6 kappa number. The pulps were characterized for kappa number, yield, viscosity, and morphologic characteristics (e.g., length, wall thickness, and coarseness). Black liquor was analyzed for total solids, organics, inorganics, sodium sulfide, sodium hydroxide, and sodium carbonate. Brownstocks were beaten at five different energy levels in a Valley beater, and the physical strength properties of 120 g/m² handsheets were measured to develop a beater curve. The results of this study showed differences in delignification between the two woods and lower pulp yield for E. benthamii , which are related to their chemical compositions and basic densities. The E. benthamii studied in this work exhibited higher amounts of lignin and extractives, lower carbohydrate content, and lower basic density. However, cooking a blend of the two woods afforded good results in pulping and in physical pulp properties.

Prehydrolysis kraft pulping of jute cutting and caddis mixture for rayon production

TAPPI Journal ◽  
2019 ◽  
Vol 18 (5) ◽  
pp. 287-293 ◽  
Author(s):  
JANNATUN NAYEEM ◽  
M. SARWAR JAHAN ◽  
RAZIA SULTANA POPY ◽  
M. NASHIR UDDIN ◽  
M.A. QUAIYYUM
Keyword(s):  
Kraft Pulping ◽  
Kappa Number ◽  
Pulp Yield ◽  
Solid Residue ◽  
Rayon Production ◽  
Kraft Cooking ◽  
Prehydrolysis Kraft

Jute cutting, jute caddis, and cutting-caddis mixtures were prehydrolyzed by varying time and temperature to get about 90% prehydrolyzed yield. At the conditions of 170°C for 60 min of prehydrolysis, the yield for 100% jute cutting was 76.3%, while the same for jute caddis was only 67.9%. But with prehydrolysis at 150°C for 60 min, the yield was 90% for jute cutting, where 49.94% of original pentosan was dissolved and prehydrolysis of jute caddis at 140°C in 60 min yielded 86.4% solid residue. Jute cutting-caddis mixed prehydrolysis was done at 140°C for 30 min and yielded 92% solid residue for 50:50 cutting-caddis mixtures, where pentosan dissolution was only 29%. Prehydrolyzed jute cutting, jute caddis, and cutting-caddis mixtures were subsequently kraft cooked. Pulp yield was only 40.9% for 100% jute cutting prehydrolyzed at 170°C for 60 min, which was 10.9% lower than the prehydrolysis at 140°C. For jute cutting-caddis mixed prehydrolysis at 140°C for 45 min followed by kraft cooking, pulp yield decreased by 3.3% from the 100% cutting to 50% caddis in the mixture, but 75% caddis in the mixture decreased pulp yield by 6.7%. The kappa number 50:50 cutting-caddis mixture was only 11.3. Pulp bleachability improved with increasing jute cutting proportion in the cutting-caddis mixture pulp.

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