Evaluation study of different glass electrodes by an interlaboratory comparison for determining the pH of fuel ethanol

Gonçalves, Mary Ane; Gonzaga, Fabiano Barbieri; Fraga, Isabel Cristina Serta; Ribeiro, Carla de Matos; Sobral, Sidney Pereira; Borges, Paulo Paschoal; Rocha, Wérickson Fortunato de Carvalho

doi:10.1016/j.snb.2011.06.029

Cited by 14 publications

(7 citation statements)

References 13 publications

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“…For total acid content, the study will assess a set of titration solvents that might adequately span the hydrophilicity e hydrophobicity range encompassed by the myriad bio-oil liquids being assessed, as well as comparing inter-lab results from NMR, GC-MS, and carboxylic acid titration. Besides defining solvent ranges, using specialized pH electrodes such as in the Ross electrodemediated titration of fuel ethanol's TAN, could offer redress for the as-yet loosely and variously defined area of bio-oil acid content [19,20].…”

Section: Introductionmentioning

confidence: 99%

Measuring bio-oil upgrade intermediates and corrosive species with polarity-matched analytical approaches

Connatser

Lewis

Keiser

et al. 2014

Biomass and Bioenergy

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Total acid numberPyrolysis oil upgrading Carboxylic acid Corrosion a b s t r a c t Integrating biofuels with conventional petroleum products requires improvements in processing to increase blendability with existing fuels. This work demonstrates analysis techniques for more hydrophilic bio-oil liquids that give improved quantitative and qualitative description of the total acid content and organic acid profiles. To protect infrastructure from damage and reduce the cost associated with upgrading, accurate determination of acid content and representative chemical compound analysis are central imperatives to assessing both the corrosivity and the progress toward removing oxygen and acidity in processed biomass liquids. Established techniques form an ample basis for bio-liquids evaluation. However, early in the upgrading process, the unique physical phases and varied hydrophilicity of many pyrolysis liquids can render analytical methods originally designed for use in petroleum-derived oils inadequate. In this work, the water solubility of the organic acids present in bio-oils is exploited in a novel extraction and titration technique followed by analysis on the water-based capillary electrophoresis (CE) platform. The modification of ASTM D664, the standard for Total Acid Number (TAN), to include aqueous carrier solvents improves the utility of that approach for quantifying acid content in hydrophilic bio-oils. Termed AMTAN (modified Total Acid Number), this technique offers 1.2% relative standard deviation and dynamic range comparable to the conventional ASTM method. The results of corrosion product evaluations using several different sources of real bio-oil are discussed in the context of the unique AMTAN and CE analytical approaches developed to facilitate those measurements. b i o m a s s a n d b i o e n e r g y 7 0 ( 2 0 1 4 ) 5 5 7 e5 6 3 http://dx.

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Section: Introductionmentioning

confidence: 99%

Measuring bio-oil upgrade intermediates and corrosive species with polarity-matched analytical approaches

Connatser

Lewis

Keiser

et al. 2014

Biomass and Bioenergy

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“…Cluster analysis is based on the principle that distances between pairs of points (i.e., samples) in the measurement space are inversely related to their degree of similarity. 3,19 The starting point for a hierarchical clustering experiment is the similarity matrix, which is formed by rst computing the distances between all pairs of points in the data set. Each distance is then converted into a similarity value (eqn (1))…”

Section: Introductionmentioning

confidence: 99%

Viagra® and Cialis® blister packaging fingerprinting using Fourier transform infrared spectroscopy (FTIR) allied with chemometric methods

et al. 2014

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“…Por estar relacionado, principalmente à quantidade de ácidos fortes, que são gerados tanto na etapa de fermentação viável e pelos contaminantes, quanto de destilação. É facilmente interpretado como grau de corrosão de tanques e motores, sendo importante parâmetro a se monitorar visando prolongar a vida útil destes (Gonçalves et al, 2011).…”

Section: Controle De Qualidadeunclassified

Gestão E Controle De Qualidade Da Produção De Bioetanol

Feroldi

Urio

Cremonez

et al. 2014

REMOA

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ResumoPor ser um grande produtor de cana de açúcar, destinada a produção de etanol, o Brasil se insere no mercado internacional na qualidade de exportações do produto. Para isso, o governo vem incentivando o setor de produção para que busquem a certificação de qualidade. O presente trabalho teve por objetivo explorar de maneira pratica e objetiva uma abordagem sobre os sistemas de gestão de qualidade, as regulamentações que regem as especificações e os métodos analíticos utilizados para garantir a qualidade do produto da indústria alcooleira. Pela produção de Bioetanol ser inerente a diversas variáveis que interferem em sua qualidade, é indispensável um controle rigoroso da sua produção e comercialização, para garantir maior confiabilidade ao mercado consumidor seja ele nacional ou internacional. A não conformidade com as exigências previstas por legislação pode gerar problemas de combustão, como a geração de borras, corrosão, redução de eficiência e vida útil do motor.Palavras-chave:Culturas energéticas, biocombustíveis, energias renováveis. AbstractFor being a large producer of sugarcane for the production of ethanol, Brazil is part of the international market as exports of the product.To this end, the Government has been encouraging the production sector to seek quality certification. The present study aimed to explore practical and objective way an approach on quality management systems, the rules governing the specifications and the analytical methods used to ensure the quality of the alcohol industry's product. By bioethanol production be inherent to several variables that interfere in its quality, evaluates essential a rigorous control of their production and marketing, to ensure greater reliability to the consumer market whether it is national or international. Non-compliance with the requirements laid down by legislation may generate problems of combustion, as the generation of Lees, corrosion, reducing efficiency and useful life of the engine.

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Evaluation study of different glass electrodes by an interlaboratory comparison for determining the pH of fuel ethanol

Cited by 14 publications

References 13 publications

Measuring bio-oil upgrade intermediates and corrosive species with polarity-matched analytical approaches

Measuring bio-oil upgrade intermediates and corrosive species with polarity-matched analytical approaches

Viagra® and Cialis® blister packaging fingerprinting using Fourier transform infrared spectroscopy (FTIR) allied with chemometric methods

Gestão E Controle De Qualidade Da Produção De Bioetanol

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