Modification of Dissolving Pulp by Hydrolysis with Cellulase Enzymes

1998 ◽  
pp. 318-327 ◽  
Author(s):  
L. Rahkamo ◽  
M. Vehviläinen ◽  
L. Viikari ◽  
P. Nousiainen ◽  
J. Buchert
Keyword(s):  
Dissolving Pulp ◽  
Cellulase Enzymes

Improvement in the Fock test for determining the reactivity of dissolving pulp

TAPPI Journal ◽  
2013 ◽  
Vol 12 (11) ◽  
pp. 21-26 ◽  
Author(s):  
CHAO TIAN ◽  
LINQIANG ZHENG ◽  
QINGXIAN MIAO ◽  
CHRIS NASH ◽  
CHUNYU CAO ◽  
...  
Keyword(s):  
Moisture Content ◽  
Sodium Hydroxide ◽  
Constant Temperature ◽  
Carbon Disulfide ◽  
Testing Procedure ◽  
Dissolving Pulp ◽  
Water Bath ◽  
Testing Conditions ◽  
Pulp Sample ◽  
Fock Reactivity

The Fock test is widely used for assessing the reactivity of dissolving pulp. The objective of this study was to modify the method to improve the repeatability of the test. Various parameters that affect the repeatability of the Fock test were investigated. The results showed that Fock reactivity is dependent on testing conditions affecting the xanthation between cellulose and carbon disulfide, such as the moisture content of the pulp sample, sodium hydroxide (NaOH) concentration, xanthation temperature, carbon disulfide dosage, and xanthation time. The repeatability of the test was significantly improved using the following modified testing procedure: air dried sample in the constant temperature/humidity room, xanthation temperature of 66°F (19°C) in a water bath, xanthation time of 3 h, NaOH concentration of 9% (w/w), and 1.3 mL carbon disulfide.

scholarly journals Optimization of Lignin Recovery from the Pre-Hydrolysate of Kraft-Based Dissolving Pulp Production Processes

2021 ◽  
Vol 11 (1) ◽  
pp. 454
Author(s):  
Adil Mazar ◽  
Naceur Jemaa ◽  
Waleed Wafa Al Dajani ◽  
Mariya Marinova ◽  
Michel Perrier
Keyword(s):  
Molecular Weight ◽  
Lignin Content ◽  
Sulfuric Acid Concentration ◽  
Dissolving Pulp ◽  
Potential Candidate ◽  
Lignin Extraction ◽  
Dissolved Organic Matters ◽  
Lignin Recovery ◽  
Total Lignin ◽  
Total Lignin Content

A pre-hydrolysate is an aqueous stream obtained during the production of hardwood kraft dissolving pulp. It is rich in sugars and contains dissolved organic matters. The purpose of this study is to investigate the optimization of lignin recovery from wood pre-hydrolysates and to characterize the extracted lignin. The optimal conditions for lignin extraction have been determined to be (a) a filtration temperature of 40 °C, (b) a sulfuric acid concentration of 8.5 kg·m−3, and (c) a coagulation time of 180 min. Using these conditions, high filtration rates have been obtained and the extracted lignin has a low content of impurities (8.3%), a low molecular weight (1270 Da), and a very low polydispersity (Mw/Mn = 1.22). Compared to kraft lignin, the pre-hydrolysate lignin has a much lower molecular weight and could be a potential candidate for niche applications. A high lignin recovery rate is possible (52% of the total lignin content in the pre-hydrolysate).

Tunable micro-structure of dissolving pulp-based cellulose nanofibrils with facile prehydrolysis process

Cellulose ◽  
2021 ◽  
Vol 28 (6) ◽  
pp. 3759-3773
Author(s):  
Yachong Zhu ◽  
Chaojun Wu ◽  
Dongmei Yu ◽  
Qijun Ding ◽  
Ronggang Li
Keyword(s):  
Cellulose Nanofibrils ◽  
Dissolving Pulp ◽  
Micro Structure

Effect of Cellulose Coating on Properties of Cotton Fabric

2016 ◽  
Vol 860 ◽  
pp. 81-84
Author(s):  
Bandu Madhukar Kale ◽  
Jakub Wiener ◽  
Jiri Militky ◽  
Hafiz Shahzad Maqsood
Keyword(s):  
Tensile Strength ◽  
Cotton Fabric ◽  
Solvent System ◽  
Dissolving Pulp ◽  
Cotton Fibers ◽  
Cellulose Solution ◽  
Dyeing Properties ◽  
Sem Micrographs ◽  
Coated Substrate ◽  
Water Solvent

Cellulose solution was used for coating and it was prepared by dissolving pulp cellulose in Urea-Thiourea-NaOH-Water solvent system. Reactive Red 240 dye was used for dyeing the coated as well as control cotton fabric. The effect of cellulose coating on the dyeing properties of cotton fabric was studied by measuring K/S values of the coated substrate at various concentrations of cellulose and dye. K/S value decreased after coating cellulose on the surface of cotton fabric. The lightness of cotton fabric increased after cellulose coating. SEM micrographs revealed that coated cellulose was attached to cotton fibers. Tensile strength increased after cellulose coating.

Ultra-high-strength composite films prepared from NMMO solutions of bamboo-derived dissolving pulp and chitosan

2021 ◽  
Vol 170 ◽  
pp. 113747
Author(s):  
Hongmei Yuan ◽  
Jianfei Wu ◽  
Dong Wang ◽  
Liulian Huang ◽  
Lihui Chen ◽  
...  
Keyword(s):  
Composite Films ◽  
High Strength ◽  
Dissolving Pulp

Deep eutectic solvent recycling to prepare high purity dissolving pulp

Cellulose ◽  
2021 ◽  
Author(s):  
Yuanhang Chen ◽  
Kuizhong Shen ◽  
Zhibin He ◽  
Ting Wu ◽  
Chen Huang ◽  
...  
Keyword(s):  
High Purity ◽  
Deep Eutectic Solvent ◽  
Dissolving Pulp

Production of dissolving pulp from Eulaliopsis binata with the concept of integrated biorefinery

Cellulose ◽  
2018 ◽  
Vol 26 (3) ◽  
pp. 2087-2097 ◽  
Author(s):  
Guodong Wu ◽  
Yuedong Zhang ◽  
Bing Yuan ◽  
Chao Liu ◽  
Guang Yu ◽  
...  
Keyword(s):  
Dissolving Pulp ◽  
Integrated Biorefinery ◽  
Eulaliopsis Binata

scholarly journals Produksi Enzim Selulase olehAspergillus niger pada Ampas Sagu

2015 ◽  
Vol 16 (1) ◽  
pp. 1 ◽  
Author(s):  
Nora Idiawati ◽  
Elliska Murni Harfinda ◽  
Lucy Arianie
Keyword(s):  
Enzyme Activity ◽  
Aspergillus Niger ◽  
Moisture Content ◽  
Cellulase Enzymes ◽  
Fermentation Time ◽  
Cellulase Enzyme ◽  
Sago Waste ◽  
Solid Fermentation

Production of cellulase by Aspergillus niger was carried out by growing the cultureson sago waste. Sago waste containscellulose that has not been used optimally. Cellulose is a polysaccharide consisting of glucose monomers linked by β-1,4-glycosides bonds. Glycoside bonds in cellulose can be enzymatically hydrolyzed into glucose with cellulase enzymes. Solid fermentation used to produce cellulase on sago waste as substrate was influenced by pH (3 to 6), moisture content(40% to 85%), and fermentation time (4 to 10 days). Products of the cellulase enzyme activity was measured by phenolsulfuricacid method. The results showed that the highest cellulase enzyme activity was 0.172 U/mL obtained at 85%moisture content, pH 5, and 8 days of fermentation time.

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