Encontrados 10 documentos, a visualizar página 1 de 1

Sorption of lead (Pb2+) from aqueous solutions using chars obtained in the pyro...

Carbonaceous solid products resulting from thermochemical processes (pyrolysis, gasification), commonly known as chars, are emerging as low-cost sorbents of metallic contaminants, being their effectiveness already demonstrated in several studies (Inyang et al., 2012; Fuente-Cuesta et al., 2012; Ko³odyñska et al., 2012; Quek and Balasubramanian, 2009; Devecia and Kar, 2013). Given the fact that the commercial v...

Hydrogenation of rapeseed oil for production of liquid bio-chemicals

The main objective of rapeseed oil hydrogenation tests was the production of liquid bio-chemicals to be used as renewable raw material for the production of several chemicals and in chemical synthesis to substitute petroleum derived stuff. As, hydrogenation of vegetable oils is already applied for the production of biofuels, the work done focused in producing aromatic compounds, due to their economic value. The...

Phylogenetic diversity of bird assemblages along different land-use gradients: ...

Tese de mestrado. Biologia (Biologia da Conservação). Universidade de Lisboa, Faculdade de Ciências, 2013 ; Land-use intensification leads to the transformation of natural habitats into antrhopogenic ones, such as farmland and meadows or, in its widest sense, into urban areas. These habitats act as environmental filters, selecting only those species whose traits enables them to survive, and although a potentia...

Hydrogenation of rapeseed oil

Rapeseed oil was rapeseed oil hydrogenated using a hydrogen pressure of 160psi, over a temperature range from 200ºC to 400ºC. Residence time was varied from 6 to 120 min. The reaction was performed in the absence and in the presence of specific inorganic catalyst. The gaseous liquid and solid yield were determined. The liquid phase was characterized using elemental analysis FT-IR, GC-HD (boiling point profile)...

Pyrolisis of plastic waste from the dismantling of used vehicles

The main objective of this study is to identify the experimental conditions that favor the production of bi-oil from pyrolisis of polypropylene (PP) coming from the scrapping of end-of-life vehicles. The experimental conditions tested were: initial pressure (2.1 to 10.3 bar), temperature (350 to 430ºC) and reaction time (1 to 900 s). The study reveals that the conditions that increase the rate of conversation o...

Chemical and bioassay fractionation of chars obtained in the co-pyrolysis of di...

The present work is devoted to the study chars obtained in the co-pyrolisis of plastics, biomass and tyres wastes. The composition of these chars is not yet well studied and only recent an attempt was made by the aithors to provide some information about the composition and risk assessment of these materials. The objectives of this work were to perform solvent extractions, using differents, in chars obtained i...

Evaluation of the toxicity of char residues produced in the co-pyrolysis of dif...

The high amounts of solid waste produced in industrial installations and in urban centers is a complex problem of today's society. The traditional strategies for solid waste transformation and disposal include and filling or incineration. Other approaches are being exploited namely waste selective collection and recycling on the energetic valorization of solid wastes through pyrolysis. In the pyrolytic process,...

Evaluation of the environmental hazard of char residues produced in the co-pyro...

Char residues produced in co-pyrolysis of different wastes were characterized through chemical and toxicity tests. A fraction of the solid chars was treated by extraction with dichloromethane. Different volatilit fractions present in the extracted and non extrated char were evaluated. A selected group of heavy metals was determined in both chars. Chars were subjected to the leaching test ISO/TS 21268-2 and resu...

Ecological risk assessment of sediment management areas : application to Sado E...

The purpose of this work was to integrate different methodologies to assess the potential ecological risk of estuarine sedimentary management areas, using the Sado Estuary in Portugal as case study. To evaluate the environmental risk of sediment contamination, an integrative and innovative approach was used involving assessment of sediment chemistry, sediment toxicity, benthic community structure, human driving...

Análise da estrutura, processo e conteúdo narrativo na psicopatologia: comparaç...