scholarly journals Bio-foam from Kraft Black Liquor

2021 ◽  
Vol 23 (3) ◽  
pp. 892-898
Author(s):  
Esra CEYLAN ◽  
Gülyaz AL ◽  
Ayben KILIÇ PEKGÖZLÜ ◽  
Deniz AYDEMİR
Keyword(s):  
Black Liquor ◽  
Kraft Black Liquor

Evaporation of lignin-lean black liquor

TAPPI Journal ◽  
2015 ◽  
Vol 14 (7) ◽  
pp. 441-450
Author(s):  
HENRIK WALLMO, ◽  
ULF ANDERSSON ◽  
MATHIAS GOURDON ◽  
MARTIN WIMBY
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Black Liquor ◽  
Salt Content ◽  
Solubility Limit ◽  
Lignin Removal ◽  
Kraft Black Liquor ◽  
Black Liquors ◽  
The Heat Transfer Coefficient

Many of the pulp mill biorefinery concepts recently presented include removal of lignin from black liquor. In this work, the aim was to study how the change in liquor chemistry affected the evaporation of kraft black liquor when lignin was removed using the LignoBoost process. Lignin was removed from a softwood kraft black liquor and four different black liquors were studied: one reference black liquor (with no lignin extracted); two ligninlean black liquors with a lignin removal rate of 5.5% and 21%, respectively; and one liquor with maximum lignin removal of 60%. Evaporation tests were carried out at the research evaporator in Chalmers University of Technology. Studied parameters were liquor viscosity, boiling point rise, heat transfer coefficient, scaling propensity, changes in liquor chemical composition, and tube incrustation. It was found that the solubility limit for incrustation changed towards lower dry solids for the lignin-lean black liquors due to an increased salt content. The scaling obtained on the tubes was easily cleaned with thin liquor at 105°C. It was also shown that the liquor viscosity decreased exponentially with increased lignin outtake and hence, the heat transfer coefficient increased with increased lignin outtake. Long term tests, operated about 6 percentage dry solids units above the solubility limit for incrustation for all liquors, showed that the heat transfer coefficient increased from 650 W/m2K for the reference liquor to 1500 W/m2K for the liquor with highest lignin separation degree, 60%.

Correlating lignin structural features to phase partitioning behavior in a novel aqueous fractionation of softwood Kraft black liquor

2013 ◽  
Vol 15 (10) ◽  
pp. 2904 ◽  
Author(s):  
Ryan J. Stoklosa ◽  
Julian Velez ◽  
Shantanu Kelkar ◽  
Christopher M. Saffron ◽  
Mark C. Thies ◽  
...  
Keyword(s):  
Black Liquor ◽  
Structural Features ◽  
Phase Partitioning ◽  
Kraft Black Liquor ◽  
Partitioning Behavior

Laccase-initiated cross-linking of lignocellulose fibres using a ultra-filtered lignin isolated from kraft black liquor

2007 ◽  
Vol 77 (4) ◽  
pp. 809-817 ◽  
Author(s):  
G. Elegir ◽  
D. Bussini ◽  
S. Antonsson ◽  
M. E. Lindström ◽  
L. Zoia
Keyword(s):  
Black Liquor ◽  
Cross Linking ◽  
Kraft Black Liquor

Investigation of acid hydrolysis for carbohydrate analysis in kraft black liquor

Holzforschung ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Silvia Maitz ◽  
Marlene Kienberger
Keyword(s):  
Acid Hydrolysis ◽  
High Performance ◽  
Degradation Products ◽  
Black Liquor ◽  
Amperometric Detection ◽  
Kraft Process ◽  
Kraft Black Liquor ◽  
Carbohydrate Degradation ◽  
Reliable Detection ◽  
Hydrolysis Of

Abstract Black liquor (BL) from the kraft process is considered a promising feedstock for several biorefinery scenarios. Besides lignin and carboxylic acids, this liquor also contains hemicelluloses and their degradation products. A simple and reliable detection of those is of importance for further processing of the liquor. The present paper presents a thorough investigation of quantitative analysis of carbohydrates, by performing acid hydrolysis experiments with a concentrated BL sample of 44% total dry solids. The hydrolysates were then analysed for the four monosaccharides arabinose, xylose, galactose and glucose, by high performance ion chromatography (HPIC) with pulsed amperometric detection. The amount of sulphuric acid needed for complete hydrolysis of the carbohydrates was determined in the range of 3.5–5 mol kg−1 of BL. A lower acid concentration led to insufficient liberation of galactose and glucose, while higher acid concentrations led to degradation of arabinose and xylose. The carbohydrate degradation was also investigated over time for different dilutions and hydrolysis temperatures. These experiments confirmed that the hexoses require considerably harsher conditions for complete liberation compared to xylose and arabinose. The use of internal recovery standards (RSs) was tested; the highest recoveries were obtained by direct spiking of the samples with the RS prior to hydrolysis.

scholarly journals Study on the Dynamic Viscoelasticity of Bamboo Kraft Black Liquor

BioResources ◽  
2016 ◽  
Vol 11 (1) ◽  
Author(s):  
Yongjian Xu ◽  
Weipeng Zhang ◽  
Hao Sun ◽  
Xiaopeng Yue ◽  
Dingjun Zhang
Keyword(s):  
Black Liquor ◽  
Dynamic Viscoelasticity ◽  
Kraft Black Liquor

Concerning operational aspects in supercritical water gasification of kraft black liquor

2019 ◽  
Vol 130 ◽  
pp. 891-901 ◽  
Author(s):  
Cataldo De Blasio ◽  
Sabino De Gisi ◽  
Antonio Molino ◽  
Marco Simonetti ◽  
Massimo Santarelli ◽  
...  
Keyword(s):  
Supercritical Water ◽  
Black Liquor ◽  
Kraft Black Liquor ◽  
Supercritical Water Gasification ◽  
Operational Aspects

Spray atomization simulation of bamboo kraft black liquor with high solid content at splash-plate nozzle

BioResources ◽  
2021 ◽  
Vol 16 (4) ◽  
pp. 6599-6612
Author(s):  
Yongjian Xu ◽  
Shenglin Chen ◽  
Xin Du ◽  
Xiaopeng Yue
Keyword(s):  
Paper Industry ◽  
Black Liquor ◽  
Injection Pressure ◽  
Development Trend ◽  
Solid Content ◽  
Nozzle Diameter ◽  
Spray Atomization ◽  
Kraft Black Liquor ◽  
Fluent Software ◽  
Solids Content

Increasing the solids content of pulping black liquor burned in a furnace is a development trend of the alkali recovery system in the pulp and paper industry. However, the viscosity of kraft black liquor increases exponentially with an increase in solids content, especially in the case of non-wood pulping black liquor, such as bamboo. This brings great difficulties to the pulping system and atomization of black liquor at the splash-plate nozzle, which is a complete atomization unit constituted of a splash nozzle and a splash plate. To obtain instructive results for industry, a simulation of the atomization process was made using Fluent software for the bamboo kraft black liquor with solids contents of 70 wt% and 80 wt%, which flowed through splash nozzles with the diameter of 22 or 20 mm. The studies were conducted on the distribution of flow field in the nozzle and atomization region through changing the injection pressure and nozzle diameter. The variation of atomization characteristic parameters, such as liquid film thickness, and breakup length, were elucidated. The results reveal the relationship between spray atomization with injection pressure and nozzle diameter, which provides a theoretical basis for improving the concentration of black liquor entering alkali recovery in the future.

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