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266 results on '"van Heiningen, Adriaan"'

6. American Process: Production of Low Cost Nanocellulose for Renewable, Advanced Materials Applications

Author

Nelson, Kim, Retsina, Theodora, Iakovlev, Mikhail, van Heiningen, Adriaan, Deng, Yulin, Shatkin, Jo Anne, Mulyadi, Arie, Hull, Robert, Series editor, Jagadish, Chennupati, Series editor, Osgood, Richard M., Series editor, Parisi, Jürgen, Series editor, Seong, Tae-Yeon, Series editor, Uchida, Shin-ichi, Series editor, Wang, Zhiming M., Series editor, Kawazoe, Yoshiyuki, Series editor, Madsen, Lynnette D., editor, and Svedberg, Erik B., editor

Published
2016
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8. CHARACTERIZATION OF LIGNIN DISSOLVED DURING ALKALINE SODIUM BOROHYDRIDE AND HYDROGEN PEROXIDE PRETREATMENTS OF SUGAR MAPLE (ACER SACCHARUM).

Author

LEHTO, JONI, VAN HEININGEN, ADRIAAN, HAAPALA, TERO, LOUHELAINEN, JARMO, PAKKANEN, HANNU, and ALÉN, RAIMO

Subjects
*SUGAR maple, *LIGNINS, *SODIUM borohydride, *HYDROGEN peroxide, *MOLAR mass
Abstract

Sugar maple (Acer saccharum) wood chips were pretreated with aqueous sodium hydroxide, sodium borohydride, and hydrogen peroxide pretreatments, and the characterization (i.e., amount, molar masses, and molar mass distributions) of the lignin dissolved during the pretreatments was performed. Of the applied pretreatments, especially borohydride pretreatments were efficient in dissolving lignin from this feedstock, as 20% to 28% of the dissolved organics were found to consist of dissolved lignin, contributing to 3.4% to 9.0% of the initial wood lignin. Corresponding values for 2.5% and 5.0% alkaline peroxide pretreatments were from 5.9% to 9.2% dissolved lignin of the total dissolved organics and from 1.1% to 3.2% of the initial wood lignin. Additionally, determined molar masses and molar mass distributions indicated that borohydride pretreatments generally led to the formation of smaller-molar-mass lignin fragments when compared to reference pretreatments and to pretreatments conducted with alkaline peroxide process, indicating more efficient lignin degradation caused by borohydride addition. For example, Mn and Mw values of the analyzed reference effluents were 54%-62% and 66%-71% higher when compared to the corresponding borohydride effluents, respectively. [ABSTRACT FROM AUTHOR]

Published
2024
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41. Influence of hot water extraction on the physical and mechanical behavior of OSB

Author

Paredes, Juan J., Jara, Rory, Shaler, Stephen M., and van Heiningen, Adriaan

Subjects
Forest products -- Properties -- Analysis, Business, Forest products industry, Design and construction, Analysis, Properties
Abstract

Abstract This study evaluated the influence of hot water extraction on hemicellulose removal, the concomitant change in wood properties, and finally production of oriented strandboard (OSB) from the modified wood. [...]

Published
2008

42. Intrinsic dissolution kinetics and topochemistry of xylan, mannan, and lignin during auto-hydrolysis of red maple wood meal

Author

Jara, Rory, Lawoko, Martin, van Heiningen, Adriaan, Jara, Rory, Lawoko, Martin, and van Heiningen, Adriaan

Abstract

High temperature aqueous treatment of wood is the preferred technology for deconstructing lignocellulosics. Many studies have been carried out on the kinetics and mechanism of hot-water extraction. However, most were performed in batch or integral plug flow reactors, which are not optimal for measuring intrinsic dissolution kinetics of the lignocellulosic components. Therefore, we used a continuous mixed batch reactor (or Berty reactor) to determine the intrinsic dissolution kinetics of xylan, mannan, and lignin from milled hardwood (Acer rubrum) at three different temperatures (150, 160, and 170 degrees C) and four constant pH values: 2, 3, 4, and 5. During the initial phase of autohydrolysis (carbohydrate-free), lignin and (lignin-free) xylan dissolve starting at a high rate and then a slowly decreasing rate, respectively. This is followed by the dissolution of xylan-lignin complexes and finally cellulose xylan complexes when cellulose has been significantly hydrolysed. The kinetics and molecular weight distribution of the removed wood polymers are used to describe the topochemistry of autohydrolysis based on recent knowledge of the ultrastructure of hardwood fibres., QC 20190313

Published
2019
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