Análise termogravimétrica da pirólise da acácia-negra (Acacia mearnsii de Wild.) cultivada no Rio Grande do Sul, Brasil

Riegel, Izabel Cristina; Moura, Ângela Beatrice Dewes; Morisso, Fernando Dal Pont; Mello, Fabiano de Souza

doi:10.1590/s0100-67622008000300014

Cited by 24 publications

(13 citation statements)

References 23 publications

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“…The results indicate that particleboards processed at 130°C using twocomponent castor oil based resin and Tauari wood particles have a promising potential to be classified as high density particleboards indicated for commercial and industrial applications 28 . The mean values of modulus of elasticity (MOE) of the particleboards (Table 2) did not reach the minimum value (2750 MPa) recommended by the A208-1-1999 standard 44 in any of the treatments, and the MOE value obtained at 130°C (2378.5 MPa) was 15.62% lower than that recommended by the aforementioned standard; however, all the values exceeded those recommended by the EN 312:2010 standard. Several researchers have reported low MOE values 16,26,30,41 , attributing this behavior to poor distribution of the adhesive during the compression of particleboards.…”

Section: Physical Characterization Of the Particleboardsmentioning

confidence: 85%

“…As for thickness swelling, the IB test results shown in Table 2 demonstrate that, regardless of the processing temperature, the mean values of this property varied from 1.55 to 1.70 MPa, which are higher than those recommended by the NBR 14810-2, A208.1:1999, and EN 312:2010 standards 43,44,47 . The mean values of IB showed no statistically significant differences at a 5% level of probability and are in agreement with those reported by Iwakiri et al 32 for Tauri wood.…”

Section: Mechanical Characterization Of the Particleboardsmentioning

confidence: 86%

“…The treatments at 110 and 130ºC resulted in significantly lower moisture contents than in the particleboards treated at 90ºC (F=109.8, p<0.001). This difference may be explained by the increase in compression temperature responsible for the evaporation of water adhered to the particle surfaces during processing, which also causes resin to cure with better densification of the particleboard 44 . The initial particle moisture content of 5% did not affect the interaction with COPR and the homogeneity of the mixture, as was also observed by Silva et al 35 .…”

Section: Physical Characterization Of the Particleboardsmentioning

confidence: 99%

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Particleboard manufactured from Tauari (Couratari oblongifolia) wood waste using castor oil based polyurethane resin

et al. 2014

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Several wood species from the Amazon region are used in the manufacture of furniture, which leaves behind large amounts of waste (slabs, sawdust, sanding dust and bark), thus causing serious environmental impacts. An interesting alternative for the use of these wastes is the manufacture of particleboards. However, few studies have focused on the behavior of Amazonian tree species and the wastes resulting from production with this type of material. This paper discusses the potential use of Tauari (Couratari oblongifolia) wood waste as a raw material for the production of particleboards, using castor oil-based bi-component polyurethane adhesive. Experimental boards were prepared with dry wood particles and a castor-oil polyurethane adhesive content of 16%. The boards, whose nominal density was 1000 kg⋅m , with higher IB and TS than those specified by the NBR 14810-2 and ANSI A208.1 standards, enabling this product to be classified as high-density particleboard suitable for industrial and commercial use.

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Section: Physical Characterization Of the Particleboardsmentioning

confidence: 85%

Section: Mechanical Characterization Of the Particleboardsmentioning

confidence: 86%

Section: Physical Characterization Of the Particleboardsmentioning

confidence: 99%

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Particleboard manufactured from Tauari (Couratari oblongifolia) wood waste using castor oil based polyurethane resin

et al. 2014

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“…25,26 A peak in the range 400-500 °C, which was only observed for MB, was attributed to the loss of lignin. Riegel et al 27 evaluated the use of different heating rates for pyrolysis of black wattle cultivated in Rio Grande do Sul. It was concluded that lignin degradation across a broad temperature range could lead to the non-appearance or overlapping of peaks during pyrolysis of the cellulosic material.…”

Section: Thermogravimetric Analysis (Tga)mentioning

confidence: 99%

Using Magnetized (Fe3O4 / Biochar Nanocomposites) and Activated Biochar as Adsorbents to Remove Two Neuro-Active Pesticides from Waters

Matos

Schultz

Khan

et al. 2017

J. Braz. Chem. Soc.

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This work describes the removal of pesticides from water using activated and magnetized biochars produced from exhausted husk, and dry tannin from barks of black wattle (Acacia mearnsii De Wild.). These materials were characterized using chemical, spectroscopic, thermal, solid structure and surface area techniques. The activated and magnetized biochars were effective in removing the pesticides thiacloprid and thiamethoxam from both ultrapure water and Marcela Water Reservoir, Itabaiana, Sergipe State, Brazil. At the longest time examined, the amounts of thiacloprid and thiamethoxam adsorbed per gram of activated biochar adsorbent were 1.02 and 0.97 mg, respectively, while values of 0.73 mg (thiacloprid) and 0.40 mg (thiamethoxam) were obtained using magnetized biochar. A pseudo-second order model correctly described the kinetics of adsorption of both pesticides (R 2 ≥ 0.922). Desorption experiments revealed that the spent biochars could not be easily regenerated, which indicated that the forces holding the adsorbed fluid molecules to the solid surface were relatively strong.

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“…Esse processo resulta em um conjunto de pequenas espécies moleculares, as quais são relacionadas à composição da matéria prima original (Riegel et al, 2008). Na pirólise, os polímeros lignocelulósicos (hemicelulose, celulose e lignina) são submetidos à clivagem térmica para produzir diferentes componentes químicos que rapidamente vaporizam-se e após condensação tem-se um líquido negro chamado de bio-óleo (Lu et al, 2011a).…”

Section: Introductionunclassified

Efeito Da Adição De Metais Inorgânicos Na Decomposição Térmica De Bagaço De Sorgo Sacarino

Cunha¹,

Carvalho²,

Ataíde³

2014

Anais Do X Congresso Brasileiro De Engenharia Química

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RESUMO -A biomassa lignocelulósica, que pode ser utilizada como alternativa para a produção de energia através de processos de conversão termoquímica como a pirólise, é uma mistura complexa de polímeros naturais de carboidratos conhecidos como celulose, hemicelulose, além de lignina e pequenas quantidades de outras substâncias. O sorgo sacarino pode complementar a produção da cana de açúcar já que seu crescimento é mais rápido, utiliza menos água e fertilizantes e alcança picos de açúcar em diferentes épocas do ano. Cada tipo de biomassa exibe uma característica particular quando pirolisada devido à proporção dos componentes que a constituem, sendo, portanto de grande importância sua caracterização. O bio-óleo é um combustível altamente oxigenado e ácido, além de ser termicamente instável e não totalmente miscível nos combustíveis oriundos de petróleo. A adição de sais inorgânicos à biomassa é uma das técnicas investigadas para promover o melhoramento da qualidade do bio-óleo. Foi realizado um estudo térmico do sorgo sacarino puro e adicionado com alguns sais, através das curvas de perda de massa (TG) e derivada de perda de massa (DTG), em diferentes taxas de aquecimento. Os resultados mostraram alterações nos parâmetros cinéticos estimados, oriundos dos dados experimentais de decomposição térmica da biomassa com a adição de sais.Palavras chave: biomassa, impregnação de sais, análise termogravimétrica INTRODUÇÃOA demanda por fontes renováveis e menos prejudiciais a natureza é cada vez maior, pois a produção de gases nocivos ao meio ambiente e a saúde humana tem crescido muito nos últimos anos devido à queima de combustíveis fósseis. Uma solução para esse problema é a utilização da biomassa, matéria residual de processos industriais e agrícolas, abundante e por isso de baixo custo (Gianesella, 2010). Uma alternativa muito interessante de biomassa pode ser a utilização do sorgo sacarino, quinto cereal em importância no mundo depois do arroz, milho, trigo e cevada. Essa matéria prima complementa a produção de cana de açúcar e desponta como a cultura ideal para alimentação e também para produção de biocombustíveis de primeira geração como o

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Análise termogravimétrica da pirólise da acácia-negra (Acacia mearnsii de Wild.) cultivada no Rio Grande do Sul, Brasil

Cited by 24 publications

References 23 publications

Particleboard manufactured from Tauari (Couratari oblongifolia) wood waste using castor oil based polyurethane resin

Particleboard manufactured from Tauari (Couratari oblongifolia) wood waste using castor oil based polyurethane resin

Using Magnetized (Fe3O4 / Biochar Nanocomposites) and Activated Biochar as Adsorbents to Remove Two Neuro-Active Pesticides from Waters

Efeito Da Adição De Metais Inorgânicos Na Decomposição Térmica De Bagaço De Sorgo Sacarino

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