Industrial wastewater reuse in inter-plant water networks / Reúso de águas e efluentes entre plantas industriais

This work aims to use a Process Integration method to extend a methodology that involves the selection of water reuse networks among industrial processes. A case study from data representative of an oil refinery and a petrochemical complex was carried out. The results with the inter-plant water networks indicated external sources that can be used for the unidirectional reutilization of the water processes from the refining to the petrochemical. Refining processes with maximum reuse had a 39% reduction in relation to the original consumption, while petrochemicals reduced by around 36%. The scenario involving the integration of both plants, with the incorporation of a distribution central tank and a regenerative process, reached a complementary reduction of about 7% of the water catchment. This integration allows the achievement of new opportunities for reuse, making it an important strategy in environmental decision making in organizations

Optimization of Hybrid Renewable Energy Systems for Power Generation: A Bibliometric Review

The use of Hybrid Power Generation Systems through renewable sources has been gaining prominence, since it is a way to reduce the dependence on fossil fuels, contributing to the reduction of pollutant gas emissions to the environment. Due to the higher operational complexity, the multiplicity of options and constant improvement of these units, how to optimize these systems is still a subject of present studies. Considering the attention that this topic has received from the academic community, the challenges for mapping and identifying the relevant literature, this article provides a macroscopic view of the scientific literature on the Optimization of Hybrid Renewable Energy Systems (HRES) for energy generation, through analysis bibliometric. The research was developed using the Web of Science database, obtaining a total of 439 articles between 2010 and 2020, where the results were interpreted through the VOSviewer software. The results showed that the number of related publications is gradually increasing, with India as the leading country. The University of Malaya is the institution with a higher number of registers, with 14 entries. Most publications fit into the “Energy Fuels” category, with the magazines “Renewable Sustainable Energy Reviews” and “Renewable Energy” as the most influential in terms of the number of publications, as well as the United States and China are the countries with most research collaboration. Besides, the most cited articles and the recurrence and distribution of keywords indicate the future directions of research. In short, this study contributes valuable information to researchers on the topic

GEOPOLÍTICA DE MUDANÇA DE ENERGIA: QUAL É O PAPEL DA SUSTENTABILIDADE NA GEOPOLÍTICA GLOBAL DE ENERGIA?

The act of dominating energy resources undoubtedly permeates the conquest of territories and their respective societies. Energy and geopolitics have always walked conjointly in the process of economic and social development in which societies have been based over the time. The multiplicity of issues that geopolitics gathered helped broaden the spectrum of analysis of geopolitical turning it more complex. This paper has the main objective to contribute for a discussion about the transition from the geopolitics based on the physical space to the geopolitics based on sustainability in which renewable energy has consolidated in the international scenario.  The final considerations highlight the quest for energy security requires more than the quest for energy self-sufficiency itself. In addition, the sustainable paradigm introduced in the geopolitics of energy new challenges as the insertion of renewable energy in a context dominated by traditional sources of energy that provokes a reflection on how the challenges related to geopolitics will be dealt with. In that way, China and India appears as a global players. The choice of cooperative dialogues appears as an essential element in the balance of the energy system.O ato de dominar os recursos energéticos indubitavelmente permeia a conquista dosterritórios e suas respectivas sociedades. A energia e a geopolítica sempre caminharamconjuntamente no processo de desenvolvimento econômico e social em que associedades se basearam ao longo do tempo. A multiplicidade de questões que a geopolíticareuniu ajudou a ampliar o espectro de análise da geopolítica tornando-a maiscomplexa. Este artigo tem o principal objetivo de contribuir para uma discussão sobrea transição da geopolítica baseada no espaço físico para a geopolítica com base nasustentabilidade em que as energias renováveis se consolidaram no cenário internacional.As considerações finais destacam que a busca pela segurança energéticaexige mais do que a busca pela própria auto-suficiência energética. Além disso, oparadigma sustentável introduziu na geopolítica da energia novos desafios como ainserção de energia renovável em um contexto dominado por fontes tradicionais deenergia que provocam uma reflexão sobre como os desafios relacionados à geopolíticaserão tratados. Dessa forma, a China e a Índia aparecem como jogadores globais. Aescolha dos diálogos cooperativos aparece como um elemento essencial no equilíbriodo sistema energético

Supercritical CO2 recovery of caffeine from green coffee oil: new experimental solubility data and modeling

The caffeine solubility in supercritical CO2 was studied by assessing the effects of pressure and temperature on the extraction of green coffee oil (GCO). The Peng-Robinson¹ equation of state was used to correlate the solubility of caffeine with a thermodynamic model and two mixing rules were evaluated: the classical mixing rule of van der Waals with two adjustable parameters (PR-VDW) and a density dependent one, proposed by Mohamed and Holder² with two (PR-MH, two parameters adjusted to the attractive term) and three (PR-MH3 two parameters adjusted to the attractive and one to the repulsive term) adjustable parameters. The best results were obtained with the mixing rule of Mohamed and Holder² with three parameters.13191323Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq

Provoking Energy Cooperation in the South Countries: Renewable Energy in Brazil and India

In the current global context where developing countries try to articulate actions to deal with the energy crisis the dialogue appears as a fundamental element. The objective of this paper, through a convergent methodology based mainly on the literature review, is to provoke a reflection about the renewable energy cooperation between emerging countries bringing for that purpose the example of Brazil and India. The results show through a careful analysis that there are more elements in common to promote renewable energy between Brazil and India than suggested the hypothesis. The conclusion brings renewable energy cooperation as a way to be traced by developing countries, in this particularly case, Brazil and India, in search for a sustainable society. Keywords: Renewable Energy Cooperation, Brazil, India JEL Classifications: F59, P28, Q4

Supercritical CO2 recovery of caffeine from green coffee oil: new experimental solubility data and modeling

The caffeine solubility in supercritical CO2 was studied by assessing the effects of pressure and temperature on the extraction of green coffee oil (GCO). The Peng-Robinson¹ equation of state was used to correlate the solubility of caffeine with a thermodynamic model and two mixing rules were evaluated: the classical mixing rule of van der Waals with two adjustable parameters (PR-VDW) and a density dependent one, proposed by Mohamed and Holder² with two (PR-MH, two parameters adjusted to the attractive term) and three (PR-MH3 two parameters adjusted to the attractive and one to the repulsive term) adjustable parameters. The best results were obtained with the mixing rule of Mohamed and Holder² with three parameters

Analyses of Interpolant Ion Effects on Smart Water Core Flooding in Carbonate

Smart water flooding (SWF) is a promising enhanced oil recovery (EOR) technique due to its economic advantages. For this process, wettability alteration is the most accepted controlling effect that leads to increased recovery factors (RFs). The main objective of this work is to investigate how the relative permeability curves’ interpolant affects the SWF mechanisms’ assessment. Wettability alteration is described by shifting these curves in simulations. Numerical simulations of core flooding tests are applied to carbonate at 114.4 °C. A comparison of oil recovery factor (RF), pH and effluent composition is performed for different injection approaches. Mg2+ and SO42− are the interpolant ions and the salinity levels range from 30 to 1 kppm. A simulation of 24 scenarios, 12 for each type of interpolant, is presented. Results show that RF changes significantly, due to salinity and composition, for each interpolant. This has a relevant influence on the interpolant. The greater the dilution, the smaller the effect of the interpolant and brine composition on the recovery estimates. When considering SO42− as an interpolant, the trend is that divalent rich brine (DV) has a higher recovery factor. In contrast, when Mg2+ is the interpolant, DV tends to have a lower recovery. The analysis of ionic exchange and pH variation corroborate the wettability alteration behavior. A pH increase was observed in all scenarios, regardless of the salinity, ion composition or interpolant variation. Also, monitoring the CH3COO-X reduction and SO4-X2 increase equivalent fractions indicated the ion exchange mechanism as being well represented in all simulations. In addition, the results emphasize that even at very low concentrations, SO42− plays a fundamental role in initiating the ion exchange process that culminates in the wettability alteration as a consequence of smart water injection