A green approach to the valorization of kraft lignin for the production of nanocomposite gels to control the release of fertilizer

2021 ◽  
Author(s):  
Vivian F. Lotfy ◽  
Altaf H. Basta
Keyword(s):  
Kraft Lignin ◽  
Nanocomposite Gels ◽  
Green Approach

Bleaching ability of pre-hydrolyzed pulps in the context of a biorefinery mill

TAPPI Journal ◽  
2013 ◽  
Vol 12 (11) ◽  
pp. 49-53 ◽  
Author(s):  
CHRISTINE CHIRAT ◽  
LUCIE BOIRON ◽  
DOMINIQUE LACHENAL
Keyword(s):  
Carbon Content ◽  
Acid Hydrolysis ◽  
13C Nmr ◽  
Kraft Lignin ◽  
Kappa Number ◽  
Hydroxyl Groups ◽  
Kraft Pulps ◽  
Quaternary Carbon ◽  
Oxygen Delignification

Autohydrolysis and acid hydrolysis treatments were applied on mixed softwood chips. The cooking ability was studied by varying the alkali and duration of the cook. Pulps with kappa numbers varying from 30 to 70 were obtained. The bleaching ability of these pulps was studied and compared to control kraft pulps. The prehydrolyzed pulps were shown to be more efficiently delignified by oxygen than the control kraft pulps starting from the same kappa number. Furthermore, the final bleaching was also easier for these pulps. It was also shown that extensive oxygen delignification applied on high-kappa pre-hydrolyzed pulps could be a way to improve the overall yield, which is a prerequisite for the development of such biorefinery concepts. Lignin was isolated from the control kraft and the two pre-hydrolyzed kraft pulps and analyzed by 13C NMR. Lignins from pre-hydrolyzed kraft pulps had similar free phenolic groups content to the control kraft lignin, but their aliphatic hydroxyl groups and β-O-4 content were lower than for the control lignin. The quaternary carbon content was the same for all the samples.

Pilot-scale combustion studies with kraft lignin in a powder burner and a CFB boiler

TAPPI Journal ◽  
2010 ◽  
Vol 9 (6) ◽  
pp. 24-30 ◽  
Author(s):  
NIKLAS BERGLIN ◽  
PER TOMANI ◽  
HASSAN SALMAN ◽  
SOLVIE HERSTAD SVÄRD ◽  
LARS-ERIK ÅMAND
Keyword(s):  
Circulating Fluidized Bed ◽  
Black Liquor ◽  
Chloride Content ◽  
Pilot Scale ◽  
High Energy ◽  
Kraft Lignin ◽  
High Energy Density ◽  
Alkali Chloride ◽  
Cfb Boiler ◽  
Solid Biofuel

Processes have been developed to produce a solid biofuel with high energy density and low ash content from kraft lignin precipitated from black liquor. Pilot-scale tests of the lignin biofuel were carried out with a 150 kW powder burner and a 12 MW circulating fluidized bed (CFB) boiler. Lignin powder could be fired in a powder burner with good combustion performance after some trimming of the air flows to reduce swirl. Lignin dried to 10% moisture content was easy to feed smoothly and had less bridging tendencies in the feeding system than did wood/bark powder. In the CFB boiler, lignin was easily handled and cofired together with bark. Although the filter cake was broken into smaller pieces and fines, the combustion was not disturbed. When cofiring lignin with bark, the sulfur emission increased compared with bark firing only, but most of the sulfur was captured by calcium in the bark ash. Conventional sulfur capture also occurred with addition of limestone to the bed. The sulfur content in the lignin had a significantly positive effect on reducing the alkali chloride content in the deposits, thus reducing the high temperature corrosion risk.

Conceptual Foundations of Environmental Marketing and Environmental Product

2020 ◽  
Vol 26 (6) ◽  
pp. 665-671
Author(s):  
D. V. Bagnyuk ◽  
A. V. Lebedev
Keyword(s):  
Sustainable Development ◽  
Methodological Approach ◽  
Russian Language ◽  
Future Research ◽  
Environmental Friendliness ◽  
Environmental Marketing ◽  
Qualitative Empirical Research ◽  
Green Approach ◽  
Market Practices ◽  
Conceptual Foundations

The presented study examines the concepts of “environmental marketing” and “environmental product”. The study attempts to conceptualize these terms in Russian language with allowance for the concept of sustainable development and the principles of the circular economy.Aim. The study aims to develop the conceptual foundations of environmental marketing and its derivative — environmental product, laying the groundwork for future research in specifying the concepts of “environmental marketing” and “environmental product”.Tasks. The authors examine the current state of environmental marketing and environmental product in Russia in terms of legislation and market practices; analyze the evolution of these concepts in foreign and Russian publications; systematize experience in this field; provide an original conceptualization of these terms; operationalize their key characteristics and features.Methods. This study is based on qualitative empirical research using such methods as content analysis, synthesis, formalization, and systematization. The theoretical and methodological approach of the study is based on the works of foreign and Russian scientists in the field of environmental marketing, the “green” approach to the promotion of goods, and sustainable enterprise development.Results. A research gap in the conceptualization of “environmental marketing” and “environmental product” in Russian language is identified. The authors provide an original interpretation of these concepts with allowance for the principles of sustainable development and “green” promotion.Conclusions. This study serves to elaborate on the scientific meaning of the concept of “environmental friendliness” applicable in marketing, changing the trend of the increasing number of products that fall under the definition of greenwashing. The published materials can be useful for environmental consultants, marketers, and representatives of legislative authorities in certifying products according to environmental standards.

Zinc Sulfamate Catalyzed Efficient Selective Synthesis of Benzimidazole Derivatives under Ambient Conditions

2019 ◽  
Vol 16 (9) ◽  
pp. 740-749
Author(s):  
Sushil R. Mathapati ◽  
Arvind H. Jadhav ◽  
Mantosh B. Swami ◽  
Jairaj K. Dawle
Keyword(s):  
Benzimidazole Derivative ◽  
Sulfamic Acid ◽  
Aromatic Aldehydes ◽  
Catalytic Amount ◽  
Product Yield ◽  
Lewis Acidity ◽  
Benzimidazole Derivatives ◽  
Ambient Conditions ◽  
Reaction Condition ◽  
Green Approach

Zinc sulfamate (Zn(NH2SO3)2 is a derivative of sulfamic acid (H3NSO3) which possesses “Lewis acidity” and finds well suited in a number of catalytic applications. The present paper describes an efficient, eco-friendly, and clean synthesis of 2-substituted benzimidazole derivatives by reacting diverse o-phenylenediamine with various substituted aromatic aldehydes using a catalytic amount of zinc sulfamate in ethanol at ambient temperature. As a result, 10 mol.% of Zinc sulfamate catalyst showed 92% of respective product yield with 100% conversion using short reaction period in ethanol. Meanwhile, effect of reaction parameters, such as amount of catalyst, different solvents, and reaction temperature on reaction product, was also studied. In addition, in the optimized reaction condition various substituted biological important benzimidazoles derivatives were prepared by using optimized reaction condition in good to efficient yield. In addition, possible reaction mechanism in the presence of zinc sulfamate for the preparation of benzimidazole derivative was sketched and discussed. The present green approach showed significances with faster reaction rate with inexpensive catalyst, which showed excellent and clean yield of benzimidazole in mild reaction condition with easy work-up procedure.

Ascorbic acid-Catalyzed One-Pot Three-Component Biginelli Reaction: A Practical and Green Approach towards Synthesis of 3,4-dihydropyrimidin- 2(1H)-ones/thiones

2013 ◽  
Vol 10 (7) ◽  
pp. 463-467 ◽  
Author(s):  
Imene Sehout ◽  
Raouf Boulcina ◽  
Boudjemaa Boumoud ◽  
Fabienne Berree ◽  
Bertrand Carboni ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Biginelli Reaction ◽  
One Pot ◽  
Green Approach ◽  
Acid Catalyzed

A Green Approach for Producing Solvent-free Anisyl Acetate by Enzymecatalyzed Direct Esterification in Sponge-like Ionic Liquids Under Conventional and Microwave Heating

2013 ◽  
Vol 1 (2) ◽  
pp. 145-154 ◽  
Author(s):  
Pedro Lozano ◽  
Juana Bernal ◽  
Almudena Lajarin ◽  
Daniel Romera ◽  
Eduardo Garcia-Verdugo ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Microwave Heating ◽  
Solvent Free ◽  
Direct Esterification ◽  
Green Approach
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