8 documents found, page 1 of 1

Caffeine analysis and extraction from a topical cream intended for UV-skin prot...

Made available in DSpace on 2021-06-25T10:16:59Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-01-01; This study aimed to develop and validate a method for the analysis of caffeine in complex cosmetic samples, such as sunscreens. Besides, an extraction method of caffeine from coffee oil and from creams, which contains both lipophilic and hydrophilic components, has been developed. The method to analyze ...

Study of a two steps process for the valorization of PVC-containing wastes

The presence of organic compounds in wastes, namely polymer based compounds, is considered a potential relevant source of energy. However, the presence of polyvinyl chloride (PVC) in their composition, causes recycling problems when a thermal process is considered for the wastes treatment [1] preventing its use on processes which the main goal is the energy recovery (Zevenhoven et al. in Fuel 81:507–510, 2002; ...

Recovery of copper and nickel hydroxide from galvanic sludge : pilot scale expe...

The present work has been developed under the scope of the project VALMETAIS and proposes a hydrometallurgical process for copper and nickel hydroxide recovery from galvanic sludges produced by Ni/Cr plating plants. In this project. the procedure has been developed at a laboratory scale and validated at a small sized pilot plant. The developed procedure includes a first stage of a counter-current sulphuric leac...

Energetic valorisation of PVC-containing waste

Wastes are increasingly regarded as important sources of energy, particularly their polymeric component. However, most of these wastes contain polyvinyl chloride (PVC) in their composition, constraining the use of a thermal valorization process in their treatment [1]. This work aims the development of a process for the material and energetic valorization of the PVC-containing wastes. A two-step process was firs...

Projecto PVC4GAS : valorização material e energética de resíduos com PVC

Kinetic study of thermal de-chlorination of PVC containing waste

With the increasing of plastics content in solid waste, both municipal and industrial, also increases the interest in its use as an energy source. Some of these wastes are an important potential source of energy and might be valorized using the pyrolysis or gasification processes. However, the presence of high chlorine contents in its composition prevents its management by a thermal process, as consequence of t...

Gestão da Obsolescência com Recurso a Componentes Comerciais

Os modernos sistemas de defesa integram, em cada vez maior quantidade, componentes comerciais ou commercial of the shelf (COTS) na sua configuração. A utilização de componentes comerciais nos sistemas de defesa apresenta grandes vantagens, tais como, o baixo custo de aquisição, a integração de componentes na vanguarda tecnológica, e desvantagens, como a obsolescência, decorrente dos seus reduzidos ciclos de vid...

Gestão da Obsolescência em Sistemas de Defesa com Recurso a Componentes Comerciais

Os modernos sistemas de defesa integram, em cada vez maior quantidade, componentes comerciais ou commercial of the shelf (COTS) na sua configuração. A utilização de componentes comerciais nos sistemas de defesa apresenta grandes vantagens, tais como, o baixo custo de aquisição, a integração de componentes na vanguarda tecnológica, e desvantagens, como a obsolescência, decorrente dos seus reduzidos ciclos de vid...