scholarly journals Fibras vegetais para produção de polpa celulósica / Vegetable fibers for cellulosic pulp production

2021 ◽  
Vol 7 (11) ◽  
pp. 101930-101941
Author(s):  
Nadine Ramos Cunico ◽  
Ana Cláudia da Silva Olímpio ◽  
Geovani Toledo Queiroz ◽  
Zaíra Morais dos Santos Hurtado De Mendo ◽  
Pedro Hurtado de Mendoza Borges
Keyword(s):  
Vegetable Fibers ◽  
Cellulosic Pulp ◽  
Pulp Production

scholarly journals Utilization of vegetable fibers for production of reinforced cementitious materials

2018 ◽  
Vol 2 ◽  
pp. 145-154 ◽  
Author(s):  
Viviane Costa Correia ◽  
Sergio Francisco Santos ◽  
Holmer Savastano Jr ◽  
Vanderley Moacyr John
Keyword(s):  
Mechanical Performance ◽  
Stress Transfer ◽  
Cost Effective ◽  
Nanofibrillated Cellulose ◽  
Cementitious Materials ◽  
Vegetable Fibers ◽  
The Matrix ◽  
As Stress ◽  
Hybrid Reinforcement ◽  
Cellulosic Pulp

Vegetable fibers produced from agroindustrial resources in the macro, micro and nanometric scales have been used as reinforcement in cementitious materials. The cellulosic pulp, besides being used as the reinforcing element, is also the processing fiber that is responsible for the filtration system in the Hatcheck method. On the other hand, the nanofibrillated cellulose has the advantage of having good mechanical performance and high specific surface, which contributes to improve the adhesion between fiber and matrix. In the hybrid reinforcement, with micro and nanofibers, the cellulose performs bonding elements with the matrix and acts as stress transfer bridges in the micro and nano-cracking network with the corresponding strengthening and toughening of the cementitious composite. Some strategies are studied to mitigate the degradation of the vegetable fibers used in cost-effective and non-conventional fiber cement, as well as to reach a sustainable fiber cement production. As a practical example, the accelerated carbonation curing at early age is a developing technology to increase the durability of composite materials: it decreases porosity, promotes a higher density in the interface generating a good fiber–matrix adhesion and a better mechanical behavior. Thus, the vegetable fibers are potentially applicable to produce high mechanical performance and sustainable cementitious materials for use in the Civil Construction.

scholarly journals Determination of the Chemical Composition of Eucalyptus spp. for Cellulosic Pulp Production

Forests ◽  
2021 ◽  
Vol 12 (12) ◽  
pp. 1649
Author(s):  
Túlio Anselmo Sacramento Vieira ◽  
Taiana Guimarães Arriel ◽  
Antônio José Vinha Zanuncio ◽  
Amélia Guimarães Carvalho ◽  
Monique Branco-Vieira ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Lignin Content ◽  
Polar Compounds ◽  
Raw Material ◽  
Alkanoic Acids ◽  
Main Components ◽  
Cellulosic Pulp ◽  
Pulp Production

The chemical composition of wood is important to assess the quality of this raw material for the industry of cellulosic pulp production. The purpose of this work was to determine the chemical composition of Eucalyptus spp. grown for cellulosic pulp production. Ten Eucalyptus spp. clones with six years of age, located in the municipality of Itamarandiba, Minas Gerais, Brazil, were used. Quantification was obtained for extractives, monosaccharides, uronic acids, acetates, lignin, ash and the phenolic composition of the extracts. In average, clones showed around 2.7% extractives, with a predominance of polar compounds soluble in ethanol and water; 27.7% lignin and 0.3% ash. Glucose was the main sugar detected (64.2%), followed by xylose (19.3%). The main components of the extractives were steroids, fatty acids and aromatic acids, followed by smaller amounts of substituted alkanoic acids, fatty alcohols, glycerol derivatives and triterpenes. The ethanol–water extracts presented total phenol contents ranging from 321.4 to 586.6 mg EAG/g of extract, tannins from 28.1 to 65.1 mg catechin/g of extract and flavonoids from 73.6 to 256.9 mg catechin/g of extract. Clones with a higher holocellulose amount and a lower lignin content showed a higher potential for cellulosic pulp production. These findings are important for the development of high-quality wood based on important traits for the pulp and paper sector.

Defoliation by insects reduces the wood quality and cellulosic pulp production

Holzforschung ◽  
2020 ◽  
Vol 74 (5) ◽  
pp. 489-495
Author(s):  
Antonio José Vinha Zanuncio ◽  
Amélia Guimarães Carvalho ◽  
Mariane Bueno de Camargo ◽  
Flaviana Reis Milagres ◽  
Vinícius Resende de Castro ◽  
...  
Keyword(s):  
Wood Quality ◽  
Eucalyptus Grandis ◽  
Basic Density ◽  
Pulp Yield ◽  
Extractive Content ◽  
Eucalyptus Saligna ◽  
Wood Volume ◽  
Cellulosic Pulp ◽  
G Ratio ◽  
Pulp Production

AbstractDefoliating insects damage forest plantations, but the estimation of their losses does not take into account wood quality changes. The objective was to evaluate the wood quality and pulp production of two clones of Eucalyptus grandis × Eucalyptus urophylla (clone A) and Eucalyptus saligna (clone B) damaged or not by defoliating insects. Five healthy trees and five attacked by Gonipterus platensis Marelli (Coleoptera: Curculionidae) were selected per clone. The wood volume per hectare in the affected settlements was at least 9% lower and damaged trees showed lower wood basic density, with at least 4.6%. The lignin and extractive content in the wood increased by at least 5.6 and 45%, respectively, while the syringyl/guaiacyl (S/G) ratio remained constant for clone A and increased 10% for clone B. For pulps, an increased effective alkali and decreased pulp yield were experienced for both clones while bleaching or pulp quality was not affected. In the stands affected by defoliating insects, productivity was 9 and 19% lower considering the wood volume per hectare and 15 and 24% considering the cellulose pulp production per hectare, respectively.

Resource efficiency in deinked pulp production: a review

TAPPI Journal ◽  
2014 ◽  
Vol 13 (11) ◽  
pp. 37-43 ◽  
Author(s):  
LIISA KOTANEN ◽  
MIKA KÖRKKÖ ◽  
ARI ÄMMÄLÄ ◽  
JOUKO NIINIMÄKI
Keyword(s):  
Waste Disposal ◽  
Resource Efficiency ◽  
Raw Material ◽  
Ecological Strategy ◽  
Recycled Paper ◽  
Paper Production ◽  
Recycled Pulp ◽  
Current State ◽  
The Cost ◽  
Pulp Production

The use of recovered paper as a raw material for paper production is by far the most economical and ecological strategy for the disposal of waste paper. However, paper production from recovered paper furnish generates a great amount of residues, and the higher the demand requirements for the end product, the higher the amount of rejected material. The reason for this is that the selectivity of the deinking process is limited; therefore, some valuable components are also lost in reject streams. The rejection of usable components affects the economics of recycled paper production. As the cost of waste disposal continues to increase, this issue is becoming more and more severe. This paper summarizes the current state of the resource efficiency in recycled pulp production and provides information on the volumes of rejected streams and the usable material within them. Various means to use these reject streams are also discussed, including the main findings of a recent thesis by the main author. This review summarizes current internal and external use of reject streams generated in the deinking operations.

Pilot trials of hemicelluloses extraction prior to thermomechanical pulp production: Part 1

TAPPI Journal ◽  
2011 ◽  
Vol 10 (5) ◽  
pp. 21-28 ◽  
Author(s):  
CARL HOUTMAN ◽  
ERIC HORN
Keyword(s):  
Oxalic Acid ◽  
Energy Savings ◽  
Wood Chip ◽  
Strength Properties ◽  
Thermomechanical Pulp ◽  
Sugar Solution ◽  
Bisulfite Treatment ◽  
Pilot Trials ◽  
Pulp Production ◽  
Production Part

Pilot data indicate that wood chip pretreatment with oxalic acid reduced the specific energy required to make thermomechanical pulp. A combined oxalic acid/bisulfite treatment resulted in 21% refiner energy savings and 13% increase in brightness for aspen. A low level of oxalic acid treatment was effective for spruce. Energy savings of 30% was observed with no significant change in strength properties. Adding bisulfite did not significantly increase the brightness of the spruce pulp. For pine, the optimum treatment was a moderate level of oxalic acid, which resulted in 34% energy savings and an increase in strength properties. For all of these treatments 1–3 w/w % carbohydrates were recovered, which can be fermented to produce ethanol. The extract sugar solution contained significant quantities of arabinose.

World trade of beet pulp pellets

2016 ◽  
pp. 501-504
Author(s):  
Sergey Gudoshnikov
Keyword(s):  
World Trade ◽  
Sugar Industry ◽  
World Market ◽  
Good Source ◽  
The World ◽  
Recent Developments ◽  
Beet Pulp ◽  
Animal Feeding ◽  
Additional Income ◽  
Pulp Production

Beet pulp remaining after the extraction of sugar from beet is a good source of highly digestible fibre and energy used for animal feeding. Beet pulp is mostly used domestically but about 15% of global dried beet pulp production is exported to the world market. Although pulp have only little value as compared to sugar, sales of it abroad help generate additional income for the sugar industry with relatively low overheads. In contrast to sugar where import markets are protected by tariffs and non-tariff barriers while export volumes can be heavily regulated by governments, these restrictions are much less extensive for beet pulp trade. This article reviews recent developments in the world trade in beet pulp. The context of the article is based on the ISO study “World Trade of Molasses and Beet Pulp” MECAS(16)06.

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