Column Tests
Mostrando 1-12 de 196 artigos, teses e dissertações.
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1. METHODS FOR EXTRACTION AND ISOLATION OF AGATHISFLAVONE FROM POINCIANELLA PYRAMIDALIS
Agathisflavone is a natural biflavone with restricted occurrence in plants. This biflavone presents several biological activities and can be important to developing new drugs. Obtaining such a molecule on a large scale for in vivo tests is a challenge. To date, there are no reports regarding its synthesis; thus, it is important to improve and develop methods
Química Nova. Publicado em: 2022
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2. Production of paste from fine tailings streams in a laboratory scale column thickener
Abstract The final disposal of tailings in the form of paste is a technological alternative. The objective of the present study is to obtain knowledge and compare different operational conditions that are favorable to the production of paste with the fine tailings generated after final desliming stage, obtained from the processing of metallic and non-metalli
REM, Int. Eng. J.. Publicado em: 2021-01
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3. Not even Freud explains this!
Abstract The final disposal of tailings in the form of paste is a technological alternative. The objective of the present study is to obtain knowledge and compare different operational conditions that are favorable to the production of paste with the fine tailings generated after final desliming stage, obtained from the processing of metallic and non-metalli
REM, Int. Eng. J.. Publicado em: 2021-01
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4. SEPARATION OF SULFUR-CONTAINING COMPOUNDS FROM DIESEL BY OXIDATION FOLLOWED BY SOLVENT EXTRACTION IN A SINGLE DROP COLUMN
Abstract Oxidative desulfurization (ODS) is an attractive complementary or alternative process for the hydrodesulfurization (HDS) process due to advantages such as mild operating conditions. In the ODS process, the sulfur-containing compounds are oxidized first to polar sulfoxide and sulfone products and then these polar compounds are separated using solvent
Braz. J. Chem. Eng.. Publicado em: 09/12/2019
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5. ENERGY AND EXERGETIC EVALUATION OF THE MULTICOMPONENT SEPARATION OF PETROCHEMICAL NAPHTHA IN FALLING FILM DISTILLATION COLUMNS
Abstract Multicomponent separation of synthetic petrochemical naphtha (hexane, cyclohexane, toluene and xylene) was carried out in a falling film distillation sequence with heat supply using a vapor chamber (thermosyphon). Tests were carried out by varying feed flow rate and temperatures of the feed and the vapor chamber in two ways of heat supply: isotherma
Braz. J. Chem. Eng.. Publicado em: 09/12/2019
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6. Ensaios de infiltração em modelos experimentais de coberturas secas utilizando cinzas de carvão mineral da Termelétrica do Pecém
RESUMO O elevado volume de cinzas de carvão mineral acumulado nas bacias de armazenamento da Usina Termoelétrica Energia Pecém resultou em uma demanda por pesquisas que propusessem diferentes formas de utilização desse resíduo, de modo a dar um destino final para este material. O uso das cinzas na forma de coberturas secas de depósitos de resíduos se
Matéria (Rio J.). Publicado em: 25/11/2019
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7. SOIL COMPACTION AND THE STABILITY OF LEVEES OF AQUACULTURE PONDS
ABSTRACT The aim of this work was to evaluate the effects of variations in soil compaction on the stability of the slope embankments of fish farms used in aquaculture. Computational modeling was performed using the RocScience Slide 6.0 program, simulating filling scenarios, fast lowering and stationary regimes for the full operation of the fish farms. The da
Eng. Agríc.. Publicado em: 04/11/2019
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8. Tecnologias avançadas de tratamento visando à remoção de cor e fenol de efluente de indústria de celulose e papel
Resumo O presente artigo teve como enfoque a remoção de cor e fenol presentes em efluente proveniente da indústria de papel e celulose a partir do emprego das tecnologias avançadas: (i) coagulação/floculação/sedimentação, (ii) filtração em carvão ativado, (iii) combinação de coagulação/floculação/sedimentação com a filtração em carvão
Ciênc. Florest.. Publicado em: 30/09/2019
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9. Experimental analysis of built-up cold-formed steel lipped channel stub column
Abstract This article reports the results of experimental tests conducted on built-up cold-formed steel (CFS) stub columns, composed of double lipped channel members connected with self-drilling screws, which will be applied as the chord members of laced columns. These experiments aim to quantify the effect of four distinct web fastener layouts on the compos
REM, Int. Eng. J.. Publicado em: 16/09/2019
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10. Remoção do 2,4-D em amostras de águas pela adsorção em leitos fixos de carvão ativado granular em escala reduzida
RESUMO O objetivo deste trabalho foi avaliar, por meio dos testes rápidos de coluna em escala reduzida, a capacidade de adsorção do carvão ativado granular (CAG) na remoção do ácido 2,4-diclorofenoxiacético (2,4-D) em amostras de água ultrapura e de água filtrada proveniente de estação de tratamento de água. Os valores da capacidade de adsorçã
Eng. Sanit. Ambient.. Publicado em: 05/08/2019
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11. Slabs strengthened for punching shear with post-installed steel and CFRP connectors
Resumo Acidentes estruturais por punção vêm sendo relatados em edifícios com lajes lisas. As recomendações de projeto apresentadas pelas normas podem levar a estimativas de resistência à punção divergentes para situações semelhantes. Além disso, não são apresentadas orientações para o dimensionamento do reforço à punção de lajes existent
Rev. IBRACON Estrut. Mater.. Publicado em: 18/07/2019
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12. Seismic Upgrading of Exterior Reinforced Concrete Frame with Small Column and Joint Area Using Externally Attached Steel Column
Abstract This paper presents cyclic load test of five exterior reinforced concrete frames. All the specimens represent a substandard single-span, low-rise reinforced concrete frame building which behaves a weak column-strong beam mechanism under a strong seismic loading. The first three exterior frames M1, M2 and M3 were designed for the joint shear critical
Lat. Am. j. solids struct.. Publicado em: 10/07/2019