A. Arshanitsa

A. Arshanitsa
Latvian State institute of Wood chemistry · Laboratory of Lignin Chemistry

Doctor of Chemistry

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58
Publications
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Publications

Publications (58)
Article
Full-text available
The main aim of this paper is improvement of the combustion characteristics of different biomass types (wood and agriculture residues, herbaceous biomass) by adding birch outer bark or bark (up to 20 %) to raw biomass with densification of the produced mixture. Produced pellets are experimentally characterized by elemental analysis determining the...
Article
Full-text available
The use of black alder (BA) bark biomass in rigid polyurethane (PUR) foam compositions was the main task of investigation. Extractive compounds isolated from the bark through hot water extraction were used as precursors for bio-polyol synthesis via acid-free liquefaction with the polyether polyol Lupranol 3300 and through oxypropylation with propyl...
Conference Paper
Two approaches to incorporating black alder (BA) bark extractives-derived polyol into a polyurethane (PU) network were studied. In the first case, fractionation of bark extractives with tetrahydrofuran (THF), focusing on isolating the biomass fraction available for obtaining PU elastomers by casting methods using cyclic ethers as a solvent, was emp...
Article
Full-text available
The isolated hydrophilic black alder (Alnus glutinosa) bark extractives were characterized in terms of component and functional composition and converted at 150°C–170°C into liquid green polyols using solvent-free and low-toxic base-catalyzed modification with propylene carbonate (PC). FTIR spectroscopy, HP-LC, GC, GPC, and wet chemistry methods we...
Article
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Table of Contents, Issue 11, Volume 12, Journal of Renewable Materials
Conference Paper
Full-text available
In response to the increasing demand for environmentally friendly materials and the necessity of effective end-of-life management [1], this study investigates the susceptibility of innovative polyurethanes (PUs) that incorporate plant extractives to biodegradation. The PUs were synthesized using polymeric methylene diphenyl diisocyanate, polyol PEG...
Article
Full-text available
The hydrophilic extractives isolated from black alder (Alnus glutinosa) bark through hot water extraction were characterized as novel renewable macromonomers capable of forming polyurethane (PU) networks based on a commercial polyisocyanate, with partial or complete replacement of petroleum-derived polyol polyether. The bark-sourced bio-polyol main...
Preprint
Full-text available
In response to growing environmental concerns and the need for sustainable resources, researchers worldwide are examining how to develop materials that are environmentally friendly and that can be effectively recycled as they reach the end of their useful life. Particularly interesting are polyurethanes (PUs), a broad class of synthetic polymers ut...
Preprint
Full-text available
This publication investigates the potential application of bark extractives as a biopolyol and extracted bark residues as a filler for producing polyurethane materials. The aim is to enhance the properties of polymeric composites while reducing the environmental impact associated with the complex utilization of bark.The comprehensive study of compo...
Preprint
Full-text available
The production of polyurethane films from bark-derived polyols requires the complete solubility of all components in the polyurethane synthesis media. In this study, a comprehensive investigation was conducted to achieve the copolymerization of black alder bark water extract-derived polyol with isocyanate for polyurethane film synthesis in THF solu...
Article
In this paper, the dominance of the physical effects of ultrasound (US) pretreatment in improving the delignification of wheat straw at a 1:20 solid/liquid (biomass/water) ratio is reported showing low-frequency/high power (25 kHz, 2 or 3 kW) as preferred conditions. The sonochemical pretreatment with alkali was identified as an optimal method to m...
Article
Full-text available
In this paper, the thermochemical conversion of selectively pre-treated binary blends composed of 30% microwave (MW) pre-treated biomass pellets (wheat straw, wood) and 70% of different origin raw biomass pellets (wheat straw, wood, or peat) was performed using originally developed experimental device with a heat output up to 20 kW. Biomass pellets...
Article
Green" extraction of black alder bark using deionized water as an alternative to organic solvents and microwave (MW)-induced heating instead of convective/conductive heating was studied. An extractor of original construction with the MW capacity of 2.4 kW, equipped with a pressurized extraction chamber (V = 1350 cm 3) and a condenser section, was u...
Article
Full-text available
The barks of aspen (Populus tremula) and pine (Pinus sylvestris) are byproducts of wood processing, characterized by their low economic value. In the present study, microwave-assisted one-cycle water extraction was explored as a tool for the valorization of this biomass as a source of biologically active compounds. The microwave extractor of the or...
Article
Full-text available
European aspen (Populus tremula (L.) (Salicaceae)) bark is a promising raw material in multi-step biorefinery schemes due to its wide availability and higher content of secondary metabolites in comparison to stem wood biomass. The main objective of this study was to investigate the major cell wall component-enriched fractions that were obtained fro...
Article
Full-text available
In the present study analysis of co-firing microwave (MW) pre-treated biomass pellets of different origins (wood and wheat straw), with raw pellets (wood, straw, and peat), to control and improve thermochemical conversion of biomass blends and achieve a sustainable use of local energy resources in energy production has been carried out. Effects of...
Article
Full-text available
In this paper, the yields and composition of solid and condensable products that were obtained by microwave-assisted torrefaction of softwood, wheat straw, and peat fuel pellets, defined as main- and side-stream torrefaction products, were studied. The torrefaction process, at temperatures varied in the range of 200–300 °C, was performed using a la...
Article
An experimentally prooven novel analytical approach for chromatographic analysis of diarylheptanoids in grey alder (Alnus incana) and black alder (Alnus glutinosa) bark matrices was established. A method for qualitative and quantitative determination of oregonin (dominant diarylheptanoid) and semiquantitative analysis of related diarylheptanoids fr...
Article
Full-text available
Possibilities of more efficient use of regional lignocellulosic resources (wood, wheat straw, peat) of different origin for an environmentally friendly energy production using selectively MW pre-treated blends of commercial wood or wheat straw pellets with raw peat pellets are studied. A hypothesis is proposed and tested that selective MW pre-treat...
Article
Full-text available
Combined coaxial-circular waveguide equipped with protective module allowing the transmission of microwave energy of three magnetrons with the output of 0.9 kW per each into the pressurized reaction chamber and capable of operating at temperatures of up to 250 °C and a pressure of up to 10 bars was designed and tested. Choke flange junction of the...
Article
Full-text available
For an effectiveness improvement of conventional pultrusion processes, new optimization methodology is developed by using the design of experiments and response surface technique. An application of this methodology with two objective functions describing the minimum electrical energy spent for a curing and maximum pull speed is successfully demonst...
Article
Full-text available
The objective of the study was to investigate a more effective use of commercially available biomass pellets (wheat straw, wood, peat) using microwave pretreatment to improve heat production. Pellets were pretreated using the originally designed microwave torrefaction device. The effects of microwave (mw) pretreatment were quantified, providing mea...
Article
Most of biorefinery technologies are focused on the utilization of plant polysaccharides into chemicals, whereas lignin, the second most abundant natural polymer, is commonly used as a resource to generate power. This is the first report on flavones-bound lignin obtained by wheat straw (WS) pretreatment under low-frequency ultrasound (US) and hydro...
Conference Paper
The composition of extracts isolated from black alder bark by ‘green’ microwave assisted water extraction in the temperature range of 70–150 ℃ was studied using the wet chemistry Folin-Ciocalteu method and Py-GC-MS/FID. The composition data were compared with those of the extracts obtained at the same temperature by accelerated solvent extraction (...
Conference Paper
Full-text available
Plantation willows are commonly grown plants which are widely used for energetic purposes that does not correspond completely to its potential. To fully integrate this resource into biorefinery scheme, it is necessary to study optimal conditions of willow bark processing, aimed for separation of bark components, their comprehensive characterization...
Article
A comparative study of the modification of chemical structure of wheat straw and aspen wood initiated by microwave (MW) assisted torrefaction at different temperatures (150 − 300 °C) was carried out using Py-GC/MS-FID, FTIR, GC-FID and wet chemistry procedures as the main analytical tools. Differences in wood and wheat straw thermal transformations...
Conference Paper
Full-text available
Processing of biomass for obtaining of liquid ethanol, platform chemicals and solid biofuel, is topical biorefinery schema intensively developing. Acid hydrolysis, separated hydrolysis and fermentation, and simultaneous saccharification and fermentation are integrated with other treatments for the advanced technology development. The aim of this wo...
Article
Full-text available
Optimization of extraction conditions of the proanthocyanidins (PAC) and PAC-rich extract (PACE) from bark of alder species (Alnus incana and Alnus glutinosa) were performed varying solvents (ethanol, distilled water), extraction methods (conventional and microwave assisted extraction), extraction temperature (20–120 °C) and extraction times (5–60...
Article
Full-text available
A condensed tannin enriched extract from Grey alder bark was completely liquefied using the batch solvent free oxypropylation process in a high pressure reactor. The obtained polyols were characterized in terms of their composition, functionality, viscosity, and reactivity towards isocyanate. The main constituents of the obtained polyols included h...
Article
Full-text available
Debarking is an essential part in the technology of round timber processing. The volume of bark going to waste annually is millions of cubic metres, therefore the use of bark as an underexploited renewable source is of increasing importance. Pelletization is one of the recognized methods for increasing the bulk and energy densities of plant biomass...
Article
A new type of organosolv wheat straw lignin, so-called Biolignin TM , was studied. It is obtained according to the biomass processing in water diluted organic acid media and is not completely soluble in conventional organic solvents traditionally applied for polyurethanes (PU) synthesis. The fractionation of the lignin by sequential extraction with...
Conference Paper
Full-text available
Wheat straw pellets are hydrophilic and after short term storage at humid atmosphere they were rapidly colonized by moulds and decreased their hardness. Microwave treatment significantly decreased hydrophilicity of wheat straw pellets and increased their bio-resistance against moulds.
Article
A comparative study of the modification of chemical composition of softwood and hardwood by torrefaction at different temperatures (150–300 °C) was carried out using microwave treatment and convective heating. The nonthermal effect was established for softwood, revealing increased aromaticity of the samples obtained under microwave treatment. A dif...
Article
Full-text available
New powdered sorbent Lignosorb based on the hydrophobized hydrolysis lignin has been developed at the Belarusian State University. Hydrolysis lignin is a commercial waste product of biomass processing in the hydrolysis production of ethanol. In spite of the various proposals for hydrolysis lignin usage, the wide application has not found yet. Speci...
Article
Full-text available
Wheat straw lignin was pretreated by organic solvents of different polarity: ethylacetate, ethylmethylketone and ethylmethylketone/water mixture, using sequential extraction technique. The total yield of fractions was ~ 40% (w/w). In comparison with non- treated lignin the solvent soluble fractions have lower molecular weights, lower polydispersity...
Article
Full-text available
The barks of deciduous trees spread over a wide area of Northern Europe, were sequentially extracted using solvents of increasing polarity. The highest yields of hydrophilic extractives were found for ash tree and goat willow (23.6% and 23.8%, respectively). The highest total contents of polyphenols were found for black alder and goat willow bark (...
Article
Full-text available
The new organosolv process of wheat straw fractionation elaborated by Compagnie Industrielle de la matiere Vegetale (France) corresponds to the biorefinery approach, which allows separating cellulose, hemicelluloses, and lignin. The straw lignin (Biolignin™) is an attractive product, for which new applications are sought. In the present work, straw...
Conference Paper
Full-text available
Grape stalks are the massive by-product of winemaking composed essentially of cellulose (ca 30%), hemicelluloses (ca 20%), lignin (ca 18%), tannins (ca 16%) and proteins (ca 6%) and could be an interesting source of solid biomass for energy needs. Among others agriculture residues (e.g. wheat straw or corncobs), grape stalks contain the relatively...
Article
Full-text available
Rigid polyurethane (FUR) foams with the apparent density in the range of 45-60 kg/m(3) were produced from tall oil polyol (TOP) and organosolv wheat straw lignin as filler. PUR foams were filled with lignin in the amount of 0-6.3 wt %. Mechanical properties, dimensional stability, water absorption and thermal conductivity of prepared foams were inv...
Conference Paper
Full-text available
In present work the BIOLIGNIN (TM) obtained in the result of wheat straw organosolv processing in CIMV pilot plant (France) was investigated as a component of rigid polyurethanes (PUR) foam systems. Different separate approaches of lignin introduction into PUR foam system were studied: as filler without chemical preprocessing and as liquid lignopol...
Article
Full-text available
To effectively produce clean heat energy from biomass, microwave (mw) pre-processing of its different types - pelletized wood (spruce), herbaceous biomass (reed canary grass) and their mixture (50:50) - was carried out at the 2.45 GHz frequency with different durations of biomass exposure to high-frequency oscillations. To estimate the mw pre-proce...
Article
Full-text available
The study is aimed at cleaner and more efficient heat energy production through investigation and analysis of the thermal decomposition of lignocellulosic biomass pellets with different elemental composition, the heating values and contents of hemicellulose, cellulose and lignin. The estimation is provided for the influence of biomass composition o...
Article
The main aim of this study is to provide the experimental research of the combustion characteristics for the different types of the biomass pellets during their thermo chemical conversion with estimation the correlations between the main characteristics of pelletized plant biomass and combustion characteristics. The experiments include first, the p...
Conference Paper
Full-text available
With the aim to provide a more effective utilization of different renewable energy resources for cleaner and more effective heat energy production, this work presents a complex experimental research and comparison of the chemical composition and combustion characteristics for different types of pelletized biomass fuels. Biomass pellets are produced...
Conference Paper
Combustion characteristics of microwave (2.45 GHz) pre-treated biomass (wood) pellets are investigated experimentally with the aim to find out the effect of pellets pre-treatment on the biomass composition and the feasibility of their thermo-chemical conversion. A complex study of the main combustion characteristics of the pre-treated biomass sampl...
Article
Analytical pyrolysis combined with gas chromatography/mass spectrometry (Py-GC/MS) was used to analyze chemical composition of non-hydrolyzed residues (LHRs) obtained by three methods of bioethanol production: softwood acid hydrolysis (AH), separate enzymatic hydrolysis and fermentation (SHF), and simultaneous saccharification and fermentation (SSF...
Article
Full-text available
The paper presents results of complex experimental study of the composition and heating values as well as the combustion and emission characteristics of a pelletized biomass fuel produced from softwood and wheat straw non-hydrolyzed lignocellulosic residues (LHRs) of bioethanol production. Those biofuels can be estimated as prospective alternative...
Article
Modification of sulphite pulp by the treatment with water-soluble silicon- containing compounds, ie, silica sol and sodium water glass, was carried out. The interaction of cellulose with modifiers was studied over a broad range of modifier/pulp mass ratios using chemical analysis, XPS analysis and X-ray spectroscopy. The formation of silicon-con...
Article
Full-text available
The paper presents the results of the experimental study of composition, heating values and combustion characteristics of granulated non-hydrolyzed residues (LHR) of separated hydrolysis and fermentation (SHF) wheat straw bioethanol processing. The LHRs ash content at 1.4-1.7 times exceeds the values for the native wheat straw samples. It was estab...

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