PAPERmaking! FROM THE PUBLISHERS OF PAPER TECHNOLOGY Volume 6, Number 2, 2020
BIOREFINERY Alternative initiatives for non Ǧ wood chemical pulping and integration with the biorefinery concept: A review, M. Sarwar Jahan, M. Mostafizur Rahman & N. Yonghao, Biofpr , https://doi.org/10.1002/bbb.2143 . Conventional pulping processes, such as soda, soda Ǧ Antraquinone (AQ), and kraft, are currently used for non Ǧ wood pulping. The main challenges of non Ǧ wood pulping in conventional pulping processes are (1) large amounts of silica cause silica Ǧ related operational difficulties in the process; (2) large amounts of fines/parenchyma cells decrease the drainage; and (3) the bulky nature of raw materials increases the collection/transportation cost, hampering large Ǧ scale commercial operations. Alternative pulping processes are therefore being developed. This paper reviews the current status of alternative non Ǧ wood pulping processes and their integration with the biorefinery concept. Several promising methods have been investigated at the laboratory or pilot scale. Organic acid and potassium hydroxide pulping processes are attractive alternatives for non Ǧ wood pulping. Dissolved lignin and hemicelluloses in spent liquor can lead to the production of valuable co Ǧ products, fitting well with the integrated biorefinery concept. Non Ǧ wood biomass can be important raw material for pulping in forest Ǧ deficient countries. Lignocellulosic Fibers from Renewable Resources Using Green Chemistry for a Circular Economy, Khandoker S. Salem, Ved Naithani, Hasan Jameel, Lucian Lucia & Lokendra Pal, Global Challenges , https://doi.org/10.1002/gch2.202000065. The sustainable development of lignocellulose fibers exhibits significant potential to supplant synthetic polymer feedstocks and offers a global platform for generating sustainable packaging, bioplastics, sanitary towels, wipes, and related products. The current research explores the dynamics of fiber production from wood, non Ǧ wood, and agro Ǧ residues using carbonate hydrolysis and a mild kraft process without bleaching agents. With respect to carbonate hydrolysis, high yield, and good coarseness fibers are attained using a simple, low Ǧ cost, and ecofriendly process. Fibers produced using a mild kraft process have lower Klason lignin, carboxyl content, surface charges, and higher fiber length, and crystallinity. Eucalyptus fibers show the highest crystallinity while softwood carbonate fibers show the lowest crystallinity. Hemp hurd fibers contain the highest concentration of hard Ǧ to Ǧ remove water, and thus, suffer maximum flattening visualized by the microscopic images. The relatively high yield sustainable fibers with versatile properties can provide a significant economic benefit since fiber is the dominant cost for producing various bioproducts. COATING Regenerative Superhydrophobic Paper Coatings by In Situ Formation of Waxy Nanostructures, Cynthia Cordt, Andreas Geissler & Markus Biesalski, Advanced Materials Interfaces , https://doi.org/10.1002/admi.202001265. This scientific−technical approach describes a unique self Ǧ structuring coating material made of wax and polysaccharide derivatives, which results in extremely water Ǧ repellent properties if applied to solid surfaces. When cooling the coating down from the molten state, the material forms a nanostructured superhydrophobic surface within seconds. This possibility of a fast thermally induced regeneration of nanoscale surface textures creates the potential to restore superhydrophobic coating properties even after mechanical damage caused, among others, by long Ǧ term use and complex processing and machining steps. Therefore, this coating material has great potential for engineering applications such as superhydrophobic wettability of paper surfaces. Depending on a particular application, there are different requirements for the interaction of paper with water. The highest possible water resistance, which is achieved by superhydrophobic properties, is a quality
Technical Abstracts
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