Projeto Preliminar De Uma Unidade Produtora De Ureia a Partir De Técnicas De Simulação E Otimização De Processos

Perlingeiro, C. A. G.; Souza, Mariana M.V.M.; Costa, Ramon Bezerra; Ribeiro, Tayrone Felix

doi:10.5151/chemeng-cobeq2014-1125-20861-165065

Cited by 6 publications

(9 citation statements)

References 5 publications

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“…The methodology to assess the economy was according to Perlingeiro. − The total investment corresponds to the sum of the materials needed to implement the process, resulting from the stages of a project known as fixed investment, and the sum of the resources necessary for initiating the production activities and maintaining them, referred to as working capital. In this way, the total investment was established only as a function of the values of inside battery limits (ISBL), the resources applied to the acquisition, transportation, and installation of equipment directly used in the processing, as shown in the following equation: …”

Section: Resultsmentioning

confidence: 99%

Continuous Biodiesel Production Catalyzed by Trace-Amount Alkali under Methanol Subcritical Conditions

Jiang

Hong

et al. 2014

Ind. Eng. Chem. Res.

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Biodiesel is a promising alternative biofuel, but the treatment of wastewater containing alkali catalyst and glycerol discharged from the washing unit operation increases the cost significantly. Here a novel continuous biodiesel production process with trace-amount alkali as the catalyst under the methanol subcritical condition was proposed and investigated. The optimal operation conditions of preliminary batch reaction experiment are temperature of 200 °C, catalyst concentration of 513 mg/kg, reaction time of 38 min, molar ratio of methanol to oil of 11.9:1, and system pressure of 1.5 MPa. The one-step conversion of raw oil in a batch reactor can reach up to 85.5%. The alkali residue in the biodiesel product can be further reduced by removing the methanol and washing by glycerol instead of by acid or water. The optimal weight ratio of glycerol to biodiesel is 1.5:1, and the residual alkali in the final ester product is about 4.6 mg/kg. The simulation and bench scale continuous experiment based on the optimal batch operation parameters confirmed that the biodiesel produced by the process is qualified well up to the Chinese standard of biodiesel, and the K + concentration in biodiesel was less than 3.0 mg/kg. The economic evaluation showed that this new process is more economically feasible than the traditional processes.

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Section: Resultsmentioning

confidence: 99%

Continuous Biodiesel Production Catalyzed by Trace-Amount Alkali under Methanol Subcritical Conditions

Jiang

Hong

et al. 2014

Ind. Eng. Chem. Res.

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“…Heat integration consists of using the heat available from hot streams to heat up cold streams. This approach aims to reduce the use of hot utilities in the system, and consequently cost of the heat exchange network (HEN) [27,28]. The number of possible solutions is a combination of the available hot and cold streams.…”

Section: Pinch Analysismentioning

confidence: 99%

“…Each stream can have a demand or an offer heat, which is the amount of heat required to reach the desired outlet temperature. Using an energy balance, the heat exchange rate can be computed [28]. Once the data collection is completed, a set of restrictions is required to solve the heat integration problem.…”

Section: Pinch Analysismentioning

confidence: 99%

Thermal Integration of Solid Oxide Fuel Cell with Ethanol Reformer through a Heat Exchanger Network

Siqueira,

Oechsler,

Catapan

2024

Preprint

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The integration of a Solid Oxide Fuel Cell (SOFC) with an ethanol reformer through a heat exchanger network was investigated aiming at improving the system's energy efficiency. This study employs lumped models and 1D modeling techniques, which, despite their simplifications, provide a good balance between computational speed and accuracy. A parametric analysis was performed focusing on the impact of temperature variations (600 oC to 900 oC) and O2:C2H5OH molar ratios (0 to 1) on the system's performance, particularly regarding efficiency, electrical power output, and heat exchange schemes. A heat exchanger network was proposed to recovery heat wasted by the SOFC exhasted gases. Results indicated that higher temperatures enhanced hydrogen production in the reformer, thereby increasing both SOFC electrical power and system efficiency. Without heat integration, the system's overall efficiency was 44.4% under specific operational conditions. Implementing a heat exchanger network, designed via pinch analysis to recuperate 842 W of heat exhasted by the SOFC, elevated the system's efficiency to 61.2%, marking a significant improvement over the non-integrated setup. This efficiency gain was achieved with minimal external heating, highlighting the potential of thermal integration in optimizing SOFC systems.

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“…Figura 6. Custo do biogás purificado em função da vazão alimentada, considerando os custos de compra de Guthrie (1969) e o método de Perlingeiro (2005). Fonte: (FRARE et al, 2006).…”

Section: Econômicasunclassified

Estado Da Arte Das Alternativas Para Remoção Do Sulfeto De Hidrogênio (H2s) Do Biogás Da Fermentação Anaeróbia De Dejetos Da Agropecuária, Seus Usos, Benefícios E Viabilidade Econômica De 1969 a 2010 – 40 Anos De Pesquisas

Machado

Mogami

Silva

et al. 2023

REASE

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O objetivo desta revisão é apresentar os principais inconvenientes do sulfeto de hidrogênio (H2S) no biogás da fermentação anaeróbia de dejetos agropecuários e expor as alternativas testadas por diversos autores, nas últimas décadas, para remover o H2S do biogás. O método mais indicado para determinada situação está atrelado aos custos de instalação, facilidade de obtenção, manutenção e operação, além da eficiência dos sistemas de purificação. Existem inúmeras técnicas de remoção de H2S que vêm sendo desenvolvidas no mundo por meio de processos de oxidação a seco; processos de adsorção; processos de biotratamento; processos de absorção física e processos de absorção química. No entanto, atualmente no Brasil são poucas as alternativas de baixo custo para purificação de biogás da fermentação anaeróbia de dejetos da agropecuária. O desenvolvimento de tecnologias e/ou processos para prover o seu aproveitamento pode contribuir com a disseminação de seu uso, além de ser uma alternativa interessante para empresas que queiram produzir e

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Projeto Preliminar De Uma Unidade Produtora De Ureia a Partir De Técnicas De Simulação E Otimização De Processos

Cited by 6 publications

References 5 publications

Continuous Biodiesel Production Catalyzed by Trace-Amount Alkali under Methanol Subcritical Conditions

Continuous Biodiesel Production Catalyzed by Trace-Amount Alkali under Methanol Subcritical Conditions

Thermal Integration of Solid Oxide Fuel Cell with Ethanol Reformer through a Heat Exchanger Network

Estado Da Arte Das Alternativas Para Remoção Do Sulfeto De Hidrogênio (H2s) Do Biogás Da Fermentação Anaeróbia De Dejetos Da Agropecuária, Seus Usos, Benefícios E Viabilidade Econômica De 1969 a 2010 – 40 Anos De Pesquisas

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