CARMEM TATIANE PRIMAZ - Academia.edu (original) (raw)

Papers by CARMEM TATIANE PRIMAZ

O café é um produto agrícola importante sendo uma das bebidas mais consumidas no mundo todo. Os r... more O café é um produto agrícola importante sendo uma das bebidas mais consumidas no mundo todo. Os resíduos obtidos durante o seu preparo (borra) são nutricionalmente ricos contendo muitos compostos bioativos com propriedades antioxidantes e, devido a seu uso em grande escala, são produzidos em toneladas e não têm até o momento um uso nobre, sendo considerado um produto residual. Neste trabalho, realizou-se o estudo da borra residual do café (Coffea arabica L.) através da pirólise, como alternativa para utilizar a borra residual de café como biomassa, fonte renovável de energia ou matéria prima para a indústria. O bio-óleo produzido (rico em ácidos, ésteres graxos, hidrocarbonetos, fenóis, cetonas, e compostos nitrogenados) foi submetido a um fracionamento com solventes pressurizados, como forma de isolar os componentes principais e de maior valor agregado. Usou-se a cromatografia gasosa mono dimensional e bidimensional abrangente, com clara vantagem para a segunda técnica, como forma de caracterização deste material. Concluiu-se que o processo de fracionamento facilitou a identificação dos constituintes, em especial isolando os componentes graxos (ácidos e ésteres) das frações de maior interesse como hidrocarbonetos, fenóis e cetonas, indicando a possibilidade de uso deste resíduo com vistas à aplicação industrial de seus subprodutos.Coffee is the most important agricultural product being one of the most consumed beverages in the world. The residues obtained during its preparation (coffee grounds) are nutritionally rich containing many bioactive compounds with antioxidant properties and, due to its use on a large scale, are produced in tons and do not have a noble use, being considered a waste product. The goal of this work was to study the coffee grounds (Coffea arabica L.) by pyrolysis as an alternative to using this biomass as a renewable energy source or raw material for industry. The bio - oil produced (rich in fatty acids, fatty esters, hydrocarbons, phenols, ketones and nitrogen compounds) was subjected to fractionation with pressurized solvents as a way to isolate the main and the higher value-added components. It was used mono dimensional and comprehensive two-dimensional gas chromatography, with a clear advantage for the second technique, in order to characterize this material. It was concluded that the fractionation process facilitated the identification of the constituents, in particular aftere the isolation of tge fatty compounds (acid and esters), producing fractions of greater interest as hydrocarbons, phenols, ketones, indicating the potential use of this residue with a view to industrial application byproducts

Chegado este momento, gostaria de agradecer à todas aquelas pessoas que me ajudaram tornar possív... more Chegado este momento, gostaria de agradecer à todas aquelas pessoas que me ajudaram tornar possível esta realização, cheia de aprendizagem profissional e pessoal. Em primeiro lugar gostaria de agradecer às professoras que me orientaram durante esta jornada:

Biomass & Bioenergy, Jul 1, 2023

This module will give you the fundamentals and working principles for understanding the Thermogra... more This module will give you the fundamentals and working principles for understanding the Thermogravimetric Analysis TGA technique, as well as, the interpretation of the obtained results and the application to the polymer degradation evaluationhttps://polimedia.upv.es/visor/?id=6a6a7f80-a72e-11ea-accc-7be568d3f28dRibes Greus, MD.; Primaz, CT.; Gil Castell, Ó. (2020). Thermogravimetric Analysis for polymer degradation evaluation. http://hdl.handle.net/10251/146517DE

Journal of earth science and engineering, May 28, 2016

Microbial, vegetal or animal organic matter, which has potential to be transformed into energy, i... more Microbial, vegetal or animal organic matter, which has potential to be transformed into energy, is considered biomass. Among the various alternative energy sources, biomass is the only one with the possibility of generating a class of substances of interest for fine chemistry (ketones, aldehydes, alcohols, phenols, etc.). From biomass, it is possible to produce bio-oil using pyrolysis, a thermodegradation process. The quality of the bio-oil depends on the process conditions (pyrolysis temperature, heating temperature, etc.) and biomass used. In this paper, the pyrolysis (using a fixed bed reactor) of three biomasses (coconut fiber, coffee grounds and sugar cane straw) is studied. The results indicated that the bio-oil yields for all biomass were similar, approximately 37%. The chemical profile obtained by gas chromatography coupled with mass spectrometry (GC/qMS) showed high amounts of fatty acids in the coffee grounds bio-oil and aliphatic and aromatic hydrocarbons in coconut fiber bio-oil, whereas guaiacols were the predominant components of the sugar cane straw bio-oil.

Fuel, Nov 1, 2018

Coffee is an important agricultural product being one of the most consumed beverages in the world... more Coffee is an important agricultural product being one of the most consumed beverages in the world. The goal of this work is to apply the pyrolysis to this residue for the production of bio-oil. The pyrolysis of the biomass (SCG) was done in a fixed bed reactor and varying the final temperature (400, 450, 500, 550 and 600°C). The higher crude bio-oil yield was obtained at 500°C with a flow of N 2 in 100 mL/min (mass yield = 30.51%). The bio-oil produced by pyrolysis of SCG had its chemical composition analyzed by comprehensive two-dimensional gas chromatography coupled to mass spectrometry detector (GC × GC/TOF-MS) and associated with LTPRI. This bio-oil showed potential for the production of chemical and liquid fuels, evidencing to be a good option for the destination of this waste. Its composition showed high amount of phenols, fatty acids and nitrogen compounds. The major compounds in the bio-oil sample were n-hexadecanoic acid (palmitic acid) (19%), 9-octadecenoic acid (oleic acid) (11%), octadecanoic acid (stearic acid) (10%).

Journal of environmental chemical engineering, Apr 1, 2020

This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

Journal of Applied Polymer Science, 2021

A set of styrene‐ethylene‐butylene‐styrene triblock copolymer (SEBS) membranes with 10 or 25 wt% ... more A set of styrene‐ethylene‐butylene‐styrene triblock copolymer (SEBS) membranes with 10 or 25 wt% divinyl‐benzene (DVB) as a crosslinking agent were prepared and validated. Physicochemical characterization revealed suitable hydrolytic and thermal stability of photo‐crosslinked membranes containing 25 wt% DVB and post‐sulfonated. These compositions were evaluated in H2/O2 single cells, and electrical and proton conductivities were furtherly assessed. The membranes with the milder post‐sulfonation showed greater proton conductivity than those with excessive sulfonation. In terms of electrical conductivity, a universal power law was applied, and the values obtained were low enough for being used as polyelectrolytes. At the analyzed temperatures, the charge transport process follows a long‐range pathway or vehicular model. Finally, fuel cell performance revealed the best behavior for the membrane with 25 wt% DVB, photo‐crosslinked during 30 min and mild sulfonated, with a promising power...

Science of The Total Environment, 2021

Sustainability, 2018

An improved and more sustainable waste management system is required for successful development o... more An improved and more sustainable waste management system is required for successful development of technologies based on renewable sources. Rice straw is submitted to controlled combustion reactions and the produced ashes are chemically treated to produce silica. After a chemical activation step, the activated silica shows potential as an adsorbent agent and will be used to remove the excess of nitrates in groundwater and wells in the area of Alginet (Valencia, Spain), selected as a vulnerable zone within the Nitrates Directive. The demonstration activity aims to have a local impact on municipalities of 200 inhabitants or fewer, decreasing from current nitrate concentrations close to 50 mg/L, to a target of 25 mg/L. In a successive step, the methodology will be transferred to other municipalities with similar nitrate problems (Piemonte, Italy) and replicated to remove different pollutants such as manure (the Netherlands) and waste waters from the textile industry (Italy).

Fuel, 2018

Industrial Crops and Products, 2018

Journal of Earth Science and Engineering, 2016

Industrial Crops and Products, 2016

Mango seed waste consists of tegument and almond and represents a considerable environmental prob... more Mango seed waste consists of tegument and almond and represents a considerable environmental problem in Brazil, due to the large amounts produced in the industrial processing of the fruit. An interesting alternative of utilising the mango seed waste is in the production of bio-oil by pyrolysis. The aim of this study was to produce bio-oil by pyrolysis of mango seed waste and observe its detailed chemical composition. The biomass, tegument and almond, were submitted to a pyrolysis in a fixed bed reactor at different final temperatures (450 • C/550 • C and 650 • C). The higher bio-oil yield obtained for tegument was 38.8% at 650 • C and for almond 28.1% at 450 • C. The bio-oils detailed compositions were investigated using GC × GC/TOFMS allied to software tools, retention index and dispersion graphics. A total number of 108 and 120 compounds tentatively identified in tegument-bio-oil and almond-bio-oil, respectively were found. The chemical compositions in each bio-oil were different. The major classes were: phenols (32.6%) and ketones (22.9%) in tegument-bio-oil and ketones (20.6%), acids (16.8%) and hydrocarbons (7.2%) in almond bio-oil. This is the first time that bio-oil has been produced by pyrolysis of mango seed waste and these bio-oils showed potential for the production of chemical and liquid fuels, proving to be a good option for the destination of this waste.

Energy, Nov 1, 2021

Abstract Cotton seed was submitted to fast pyrolysis in a fixed bed reactor and the liquid and so... more Abstract Cotton seed was submitted to fast pyrolysis in a fixed bed reactor and the liquid and solid products were characterized applying several techniques. The detailed chemical composition of the bio-oil was investigated using GC × GC/TOFMS combined with software tools and retention index. A total of 257 compounds were tentatively identified with 168 were confirmed by LTPRI. The most abundant compounds identified in the cotton seed bio-oil were nitrogenous (56 compounds) and phenolic (42 compounds) what distinguishes this bio oil from others, produced from various sources of biomass. The higher heating values of cotton seed and bio-oil were 19.34 MJ kg −1 and 34.25 MJ kg −1 respectively and demonstrating the feasibility of the use of cotton seed in its natural form for energy generation or as a secondary source once a bio-oil with these characteristics would be a suitable candidate for use in boilers for heating purposes or chemical extraction. The biochar had a significant carbon content and a high heating value (22.12 MJ kg −1), making it attractive for fuel applications. The activation methods used were able to improve the physical and chemical characteristics of the biochar, as demonstrated by methylene blue adsorption tests. The maximum adsorption capacity of NaOH-activated biochar was 23.82 mg g −1 while that of K2CO3-activated biochar was 332.40 mg g −1.