Xylene Recovery
Mostrando 1-10 de 10 artigos, teses e dissertações.
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1. ANÁLISE SIMULTÂNEA DOS INDICADORES BIOLÓGICOS DE EXPOSIÇÃO AOS SOLVENTES ETILBENZENO, ESTIRENO, TOLUENO E XILENO NA URINA POR CLAE-UV
A method for simultaneous analysis of phenylglyoxylic (PGA), mandelic (MA), hippuric (HA), orto-, meta- and para-methylhippuric (o-, m- and p-MHA) acids in urine, by high performance liquid chromatography with UV detection was developed and validated. The substances are biotransformation products used as biological indicators to assess the exposure of worker
Quím. Nova. Publicado em: 2016-11
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2. BTEX: DESENVOLVIMENTO DE BARRAS DE EXTRAÇÃO SORTIVA, DETERMINAÇÃO EM EFLUENTE HOSPITALAR E DEGRADAÇÃO POR MEIO DE FOTOCATÁLISE HETEROGÊNEA COM TiO2 SUPORTADO EM POLÍMEROS / BTEX: DEVELOPMENT OF BARS SORPTIVE EXTRACTION, DETERMINATION IN HOSPITAL EFFLUENT AND DEGRADATION BY HETEROGENEOUS PHOTOCATALYSIS WITH TIO2 SUPPORTED IN POLYMERS.
In this work were developed low cost bars of sorptive extraction, using commercial adhesive based on polydimethylsiloxane (PDMS) for the preconcentration and determination of benzene, toluene, ethylbenzene and xylene (BTEX) in effluent from the University Hospital of Santa Maria (HUSM). It was applied multivariate fractional factorial design (26-2) to invest
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/02/2012
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3. Otimização e validação de métodos analíticos para determinação de BTEX em água utilizando extração por headspace e microextração em fase sólida
Three analytical methods for the determination of BTEX in water were optimized and validated. With the best method the analytes were extracted of 10 mL of sample with 2.50 g of NaCl in headspace vial of 20 mL by HS and SPME to 40 ºC for 30 min for adsorption and to 250 ºC for 4 min for desorption and were analyzed by GC-MS. The recovery was between 97.9% a
Química Nova. Publicado em: 2010
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4. Management and chemical waste management and application of distillation technique in organic solvent recovery: case analyze of xylene recovery / Gestão e gerenciamento de resíduos químicos e aplicação da tecnologia de destilação na recuperação de solventes orgânicos: estudo de caso da reciclagem do xileno
Este trabalho de pesquisa foi elaborado com o objetivo de apresentar os resultados da recuperação e reciclagem de xileno, gerado em laboratórios de análises clínicas. É importante salientar a importância de um programa de gestão e gerenciamento de resíduos químicos, principalmente em instituições de ensino e pesquisa, de forma a contribuir para a
Publicado em: 2008
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5. Quantificação simultânea de indicadores biológicos de exposição a solventes orgânicos por cromatografia líquida de alta eficiência
Biological monitoring is very important to guarantee health to workers. This method was developed for simultaneous determination of xylene, toluene, styrene and ethylbenzene metabolites. It involves only dilution and centrifugation of urine samples and improved chromatographic conditions. Analyses show recovery > 95%; r² > 0.99; intermediate precision CV% <
Química Nova. Publicado em: 2008
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6. Indicadores Biológicos de Exposição a solventes orgânicos e sua inter-relação com o estresse oxidativo / Biological Exposure Indices of organic solvents and its relationship with the oxidative stress
The use of organic solvents in the work environment represents a significant risk to workers health. The painters composed, among others, a group of individuals who are in direct contact with solvents through the respiratory and dermal route. The biological monitoring, through biological exposure index (BEI) determination, can ensure the emergence of chronic
Publicado em: 2008
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7. DETERMINATION OF LEAD IN KEROSEN AND IN LUBRICATING OIL BY ANODIC STRIPPING VOLTAMMETRY USING BISMUTH-FILM ELECTRODE AND SAMPLE PREPARATION AS MICROEMULSION / DETERMINAÇÃO DE CHUMBO EM QUEROSENE E EM ÓLEO LUBRIFICANTE POR VOLTAMETRIA DE REDISSOLUÇÃO ANÓDICA USANDO ELETRODO DE FILME DE BISMUTO E MEIO MICROEMULSIONADO
In the presente work, was developed an analytical method aiming the determination of lead in kerosen and in lubricating oil. Anodic redissolution voltammetry with a bismuth-film electrode was employed by measuring the analyte in the sample microemulsions. Square-wave scanning mode (SWV) was employed and the BiFE performance was compared to the one achieved u
Publicado em: 2008
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8. Liquid-liquid equilibrium in systems including aromatic hydrocarbons, aliphatic and sulfolane / Equilibrio liquido-liquido em sistemas contendo hidrocarbonetos aromaticos, alifaticos e sulfolano
An important stage within the processes in the petrochemical industry uses the solvent sulfolane in the recovery of high-purity aromatic hydrocarbons. These aromatic compounds are separated from the aliphatic hydrocarbons through solvent extraction, since distillation is not suitable. Experimental data of the multicomponent liquid-liquid equilibrium are esse
Publicado em: 2005
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9. Gold recovery by galvanic stripping of an anionic organic extractant
The galvanic stripping technique for metal recovery uses commercial organic extractants containing a metal to be recovered. The organic phase is placed in contact with a solid metal reducer that allows electrochemical reactions to occur. One product of these reactions is a metal layer deposited on the surface of the reducer consisting of reduced species deso
Brazilian Journal of Chemical Engineering. Publicado em: 2001-06
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10. Thin-layer chromatography of hippuric and m-methylhippuric acid in urine after mixed exposure to toluene and xylene.
The separation of hippuric and m-methylhippuric acid as toluene and m-xylene metabolites present in urine of people exposed simultaneously to toluene and xylene is described. Chloroform was used for hippuric and m-methylhippuric acid extraction. Satisfactory separation of these metabolites was obtained on TLC plates covered with silica gels and developed in