Browsing by Author "Camilo, Gabriel L."
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- Production of ethanolic biodiesel from waste cooking oils and purification through adsorption using olive pits based materialsPublication . Camilo, Gabriel L.; Queiroz, Ana; Ribeiro, António E.; Brito, Paulo; Gomes, Maria Carolina Sérgi
- Review of biodiesel production using various feedstocks and its purification through several methodologies, with a specific emphasis on dry washingPublication . Camilo, Gabriel L.; Queiroz, Ana; Ribeiro, António E.; Gomes, Maria Carolina Sérgi; Brito, PauloRenewable biomass fuels are gaining attention as a cleaner energy alternative to fossil-based resources. Biodiesel, derived from biological sources, is particularly attractive due to its renewable and ecological benefits. Researchers are actively exploring various methodologies to convert biomass into gaseous and liquid fuels, similar to petroleum products. To optimize production and accommodate different feedstock sources, biodiesel production through different routes is becoming popular. The purification of biodiesel is an important step, and current methods involving water usage are being replaced with more sustainable alternatives. Adsorption and ion exchange, known as dry washing methods, are widely used for biodiesel purification worldwide. These processes use an adsorbent to selectively remove impurities from the liquid phase, offering advantages such as easy integration, shorter purification time, reduced water consumption, and minimal effluent generation. This review focuses on biodiesel production and purification methods, highlighting the advantages of adsorption over traditional wet washing methods.
- Study of biodiesel production from waste cooking oil by ethyl transesterification and its purification using adsorption processesPublication . Camilo, Gabriel L.; Gomes, Maria Carolina Sérgi; Queiroz, Ana; Ribeiro, António E.; Brito, PauloIn the year 2020, global biodiesel production reached 46.45 million tons, with biodiesel from waste cooking oils (WCO) constituting approximately 10% of this total, with Europe accounting for approximately 33% and Brazil 12% of global production [1]. The cost of conventional biodiesel production is higher than the production of diesel from petroleum, since it is produced mainly from high quality virgin oils, it is estimated that 70 to 80% of the total cost of biodiesel production is associated with the cost of the raw materials [2]. With this perspective, biodiesel production from WCO has become an economic opportunity and an environmental strategy to help address global renewable energy challenges and contribute to a sustainable society [3]. Oil with hours of frying at high temperatures results in the loss of its edible properties and nutritional value, the disposal of used cooking oil remains an issue due to its environmental and human health threats [4]. In this scenario, the collection and destination of these oils for the production of a value-added and environmentally friendly biofuel presents itself as an opportunity to be investigated. Adsorption and ion exchange are the most commonly used affinity separation processes in biodiesel purification worldwide, these methods are also known as dry washing methods. In these processes, an appropriate adsorbent is used to selectively remove certain impurities from the liquid phase onto its surface. Dry cleaning offers several advantages, including simple integration into an existing plant, shorter purification time, lower water consumption and lower effluent generation
- Study of biodiesel production from waste cooking oil by ethyl transesterification and its purification using adsorption processesPublication . Camilo, Gabriel L.; Gomes, Maria Carolina Sérgi; Queiroz, Ana; Ribeiro, António E.; Brito, PauloIn recent years, a collective effort is made in search of alternative forms of energy through renewable and more friendly to the environment sources, currently, about 80% of the world consumption of energy comes from fossil fuels. The environmental problems associated with the use of these non-renewable fuels include air pollution and global warming, moreover, the uncertain price of a barrel of oil in the current economy also causes economic problems in its dependence. Thus, due to these problems in the dependence on fossil fuels for industry, transport and domestic purposes, research on alternative energy sources has become ever more common [1]. In this scenario, biodiesel presents itself as a renewable fuel, environmentally friendly and with similar characteristics to common diesel. According to [2] in 2020, global biodiesel production reached 46.45 million tons, with biodiesel from waste cooking oils (WCO) constituting approximately 10% of this total, with Europe accounting for approximately 33% and Brazil 12% of global production. The cost of conventional biodiesel production is higher than the production of diesel from petroleum, since it is produced mainly from high quality virgin oils, it is estimated that 70 to 80% of the total cost of biodiesel production is associated with the cost of their raw materials [3]. With this perspective, biodiesel production from WCO has become an economic opportunity and an environmental strategy to help address global renewable energy challenges and contribute to a sustainable society [4]. Oil with hours of frying at high temperatures results in the loss of its edible properties and nutritional value, the disposal of used cooking oil remains an issue due to its environmental and human health threats, countries are now imposing penalties and restrictions on the disposal of this cooking waste in drainage systems and/or natural water bodies [5]. In this scenario, the collection and destination of these oils for the production of a value-added and environmentally friendly biofuel presents itself as an opportunity to be investigated
- Study of biodiesel production from waste cooking oil by ethyl transesterification and its purification with the use of activated carbons derived from olive pitsPublication . Camilo, Gabriel L.; Queiroz, Ana; Ribeiro, António E.; Gomes, Maria Carolina Sérgi; Brito, PauloThe world production of biodiesel in 2020 reached approximately 46 million tons, with 10% of the total amount representing biodiesel from waste cooking oils (WCO) [1]. The cost of conventional biodiesel production is higher than of diesel from petroleum, since it is carried out mainly from high quality virgin oils. It is estimated that 70 to 80% of the total cost of biodiesel production is associated with the cost of the raw materials [2]. With this perspective, biodiesel production from WCO has become an economic opportunity to help address global renewable energy challenges [3]. The wet washing method, which uses water to purify the esters, is the most commonly used purification process in biodiesel production. Despite being an efficient method, wet washing generates huge amounts of wastewater, on the other hand, dry washing methods uses an appropriate adsorbent to selectively adsorb certain impurities from the liquid phase onto its surface, avoiding the use of water in the purification step and offering several advantages, including simple integration into an existing industrial plant, shorter purification time and lower effluent generation. In this work, the goal is to optimize the production of biodiesel from WCO vía the ethylic route through its purification by adsorption with a focus on glycerol removal, applying various natnral adsorbents, physically and chemically activated with acid and basic agents, and obtained from residual sources ofbiomass (olive pits). The optimized conditions for the production of biodiesel were found using a response surface methodology with 3 parameters: alcohoVoil molar ratio, reaction temperature and catalyst concentration. Four types of activated carbon were produced from the same precursor (olive pits) and then characterized. The two most efficient materials for glycerol removal were selected by means of equilibrium adsorption studies. Mterwards, kinetic adsorption batch studies (see Table 1) were carried out at 3 different temperatures for each of the two selected adsorbents (CA-800°C and CA-ZnCh) using the same adsorbent concentration (5% wt/wt). The dry washing proved to be efficient in drastically reducing water consumption and effluent generation, in addition, an energy consumption reduction is achieved since there is no need to heat the biodiesel to remove moistnre caused from the wet washing process.
- Study of biodiesel production from waste cooking oil by ethyl transesterification and its purification with the use of natural adsorbentsPublication . Camilo, Gabriel L.; Gomes, Maria Carolina Sérgi; Queiroz, Ana; Ribeiro, António E.; Brito, PauloBiodiesel production from waste cooking oil (WCO) has become an economic opportunity and an environmental strategy to help address the global challenges of renewable energy production. Considering classical industrial processes for biodiesel production, adsorption and ion exchange technologies are the most commonly used alternatives for crude biodiesel purification. These methods, also known as dry cleaning methods, use an appropriate adsorbent to selectively remove certain impurities from the liquid biodiesel phase through contact with the surface of the adsorbent. Dry cleaning offers several advantages, including simple integration into an existing industrial plant, shorter purification time, lower water consumption, and lower effluent generation. In this work, the main goals are the optimization of ethylic biodiesel production from WCO, followed by the study of its purification by adsorption, applying various types of previously characterized natural adsorbents, physically and chemically activated, which were obtained from residual biomass (olive pits), with a specific focus on glycerol removal.