Recovery of wool from flax fibers using nitric acid

Shishonok, M. V.; Shadrina, V. I.

doi:10.1134/s1070427206090291

Cited by 4 publications

(2 citation statements)

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“…Bleaching operations common in pulping processes have also been investigated, with sodium chlorite (Pacaphol and Aht-Ong 2017), oxygen (Danielewicz and Surma-Slusarska 2011;Kopania et al 2012), hydrogen peroxide (Kopania et al 2012;Pandey et al 2019;Petrova et al 2003), peracetic acid (Danielewicz and Surma-Slusarska 2011) and oxone (Stewart and Morrison 1996). Other investigations have looked at treatments with formic acid (de Vega and Ligero 2017), nitric acid (Shishonok and Shadrina 2006), ethanol/water mixtures (Gosselink et al 1995), and ionic liquids (Fu et al 2010). With a view to develop treatments that are more lignin-selective and generate lower chemical loads in the process wastewater, investigations have been performed on the use of hydrotropic reagents (Denisova et al 2015) and with pressurized low polarity water (Kim and Mazza 2009).…”

Section: Chemical Treatmentsmentioning

confidence: 99%

Extraction of cellulose fibers from flax and hemp: a review

2021

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The paper is a review on the extraction processes of cellulosic fibers from flax and hemp. The two lignocellulosic crops have a long history of use by humans for extraction of the bast fibers among other purposes. The utility of bast fibers declined over time with industrial advances and changes to the economy, but of late, with an increase of focus on environmental impact and sustainability, there is a renewed interest in these resources. The use of biomass-based resource requires an appreciation of plant anatomy and the agronomical variables in their cultivation and harvesting. This review provides an overview of these aspects as well as of the processes of retting for initial weakening of the plant structure in preparation for fiber extraction, degumming to isolate fiber bundles, and delignification.

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Section: Chemical Treatmentsmentioning

confidence: 99%

Extraction of cellulose fibers from flax and hemp: a review

2021

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“…Two-stage pretreatment methods are highly effective in degrading non-cellulosic components of plant biomass to furnish substrates (cellulose) with a low content of non-cellulosics, which implies efficient enzymatic hydrolysis. The advantage of nitric acid for biomass treatment is that HNO 3 exhibits an exceptional reactivity to lignin, allowing fast oxidative delignification at moderate temperature and atmospheric pressure [22,43,44]. Alkaline treatment of feedstocks can dissolve non-woody lignin at a small alkali concentration and atmospheric pressure [3].…”

Section: Introductionmentioning

confidence: 99%

Pretreatments of Non-Woody Cellulosic Feedstocks for Bacterial Cellulose Synthesis

2019

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Pretreatment of biomass is a key step in the production of valuable products, including high-tech bacterial cellulose. The efficiency of five different pretreatment methods of Miscanthus and oat hulls for enzymatic hydrolysis and subsequent synthesis of bacterial cellulose (BC) was evaluated herein: Hydrothermobaric treatment, single-stage treatments with dilute HNO3 or dilute NaOH solution, and two-stage combined treatment with dilute HNO3 and NaOH solutions in direct and reverse order. The performance of enzymatic hydrolysis of pretreatment products was found to increase by a factor of 4−7. All the resultant hydrolyzates were composed chiefly of glucose, as the xylose percentage in total reducing sugars (RS) was 1−9%. The test synthesis of BC demonstrated good quality of nutrient media prepared from all the enzymatic hydrolyzates, except the hydrothermobaric treatment hydrolyzate. For biosynthesis of BC, single-stage pretreatments with either dilute HNO3 or dilute NaOH are advised due their simplicity and the high performance of enzymatic hydrolysis of pretreatment products (RS yield 79.7−83.4%).

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