Adição de antraquinona na polpação alcalina de &lt;i&gt;Eucalyptus saligna.&lt;/i&gt;

Jerônimo, Lúcia Helena; Foelkel, Celso; Frizzo, Sônia Maria Bitencourt

doi:10.5902/19805098468

Cited by 8 publications

(8 citation statements)

References 1 publication

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“…Consequently, they are the most frequently used [45].The pulping processes involving sulfur-based compounds, such as Kraft and sulfite methods, have the disadvantage of emitting unpleasant odor gases. As a result, the quest to reduce atmospheric emissions of sulfur gases has made an important goal for many industrial plants [51]. Some researchers have focused on developing and improving established pulping and bleaching processes, as well as finding new pulping technologies.The influence on the use of anthraquinone in the pulping of Eucalyptus saligna wood chips was evaluated by Jerônimo, Foelkel, and Frizzo [51].…”

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confidence: 99%

The Use of Cellulose Nanofillers in Obtaining Polymer Nanocomposites: Properties, Processing, and Applications

Santos¹,

Iulianelli²,

Tavares³

2016

MSA

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In recent years, several studies have been performed using nanocellulose as a component in polymeric nanocomposites. The interest in studying cellulose-based nanocomposite is due to the abundance, renewable nature, and outstanding mechanical properties of this nanoparticle. However, obtaining nanocomposites based on nanocellulose, with optimal properties, requires good nanoparticle dispersion in the polymeric matrix. The chemical compatibility between nanofiller and polymer plays a major role in both the dispersion of particles in the matrix and the adhesion between these phases. The aim of this review is to present the fundamental concepts about nanocellulose, such as its structural aspects, production methods and current trends in classification, and the main aspects about cellulose-based nanocomposites, including the progress that has been reached in relation to their compatibilization, production, final properties and potential applications. F. A. dos Santos et al. 258 properties such as biodegradability, biocompatibility, low toxicity, and low cost among others [4]. These properties provide a great potential for use in applications from plastic bags and packaging to biomedical fields, including bone plates, fixation screws or sutures. However, to replace petroleum-based thermoplastics, biopolymers need to have comparable properties and processing methods to those conventionally used. In order to improve their properties, many biopolymers have been used in the preparation of nanocomposites [1].Similar to conventional composites, nanocomposites are composed of at least two components; one of them is the matrix or continuous phase, in which nanosized particles are dispersed. These nanosized particles or nanoparticles constitute the second phase, referred to as the dispersed phase. Polymer nanocomposites are a recent alternative to conventionally filled polymers. Due to the reduced size of dispersed phase and its good dispersion in the polymer matrix, these materials exhibit markedly improved properties when compared to the pure polymers or their traditional composites [5]. They also exhibit unique optical, electrical, and magnetic properties [6].Biopolymers, such as chitin, starch, and cellulose, can be employed as reinforcement filler or as matrix in the production of nanocomposites [2]. Cellulose is one of the best natural materials to generate nanofillers for producing nanocomposites that are based on renewable raw material sources, because it is the most abundant biopolymer in nature and is available in a wide variety of resources, such as plants and microorganisms [7]- [11].The nanofillers isolated from cellulose have been used as a reinforcing material in many natural and synthetic polymers [12]- [18]. The use of these nanofillers has proven effective due to the large surface area and the excellent mechanical properties presented by cellulose [19]. Furthermore, the addition of cellulose-based nanofillers promotes a better performance of the nanocomposite in relation to their barrier, thermal and mech...

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mentioning

confidence: 99%

The Use of Cellulose Nanofillers in Obtaining Polymer Nanocomposites: Properties, Processing, and Applications

Santos¹,

Iulianelli²,

Tavares³

2016

MSA

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“…This leads to oxidation of the reducing group of carbohydrates, stabilizing them against terminal depolymerization reactions, which in turn increases the yield because this stabilization protects the carbohydrates against degradation and solubilization reactions. The research findings of Jerônimo et al (2000) indicated that the use of anthraquinone improved delignification, thereby reducing sulfidity. According to their findings, soda-anthraquinone delignification yields slightly lower results, but offers a promising potential for manufacturing plants that generate odors which pose a serious problem.…”

Section: Use Of Anthraquinone In the Kraft Processmentioning

confidence: 99%

Influence of the Chemical Properties of Wood on the Odor Produced by the Kraft Pulping Process

Chagas¹,

Wolski²,

Vieira³

2019

IJAERS

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Chemical reactions occur between inorganic compounds and wood chips during the cooking step of the Kraft process. White liquor, which in this process is composed of sodium hydroxide (NaOH) and sodium sulfide (Na2S), is mixed with wood chips in the digester in order to dissolve the lignin and produce wood pulp. However, other compounds are formed during the course of the chemical reactions. These compounds are volatile and malodorous due to the combination of the sulfur in white liquor and the carbon chains in lignin. This combination creates total reduced sulfur (TRS) compounds, which are malodorous gases responsible for the distinctive odor of the Kraft pulping process. This paper discusses the chemical composition of the wood species that contribute to these gas emissions. Gases are also released in other stages of the process, e.g., from the woodchips stored in the woodyard for factories that use only long pine fiber, from the digester, pulp washing filters, and from white, black and green liquor storage tanks. One way to reduce TRS emissions is through continuous attention to and correction of the pH levels of liquors containing sulfide ions.

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“…A antraquinona (AQ) é uma substância orgânica que apresenta coloração amarelada, A intensificação observada na taxa de deslignificação após a adição da antraquinona se dá através das reações de hidrólise das ligações ß-éter, ocasionando a formação de fragmentos de lignina de menor massa molar, os quais são mais facilmente removidos (JERÔNIMO et al, 2000a). Segundo esse processo, inicialmente a antraquinona é reduzida no licor de cozimento pelos açúcares existentes no mesmo, consequentemente ocorre à formação de antrahidroquinona, a qual é facilmente solubilizada em condições alcalinas.…”

Section: Antraquinonaunclassified

Aumento da eficiência do processo kraft de polpação a partir de pré-tratamento de cavacos de madeira de eucalipto

Vivian¹

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Adição de antraquinona na polpação alcalina de <i>Eucalyptus saligna.</i>

Cited by 8 publications

References 1 publication

The Use of Cellulose Nanofillers in Obtaining Polymer Nanocomposites: Properties, Processing, and Applications

The Use of Cellulose Nanofillers in Obtaining Polymer Nanocomposites: Properties, Processing, and Applications

Influence of the Chemical Properties of Wood on the Odor Produced by the Kraft Pulping Process

Aumento da eficiência do processo kraft de polpação a partir de pré-tratamento de cavacos de madeira de eucalipto

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