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Purificação de biogás usando membranas líquidas suportadas e solventes verdes
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Abstract(s)
Neste trabalho, numa primeira etapa foram preparados diferentes solventes eutécticos (DES), nomeadamente, cloreto de colina:ureia, cloreto de colina:ácido levulínico, betaína:ureia e betaína:ácido levulínico com uma razão molar de 1:2. Após a sua preparação, os mesmos foram caracterizados, medindo a sua densidade, viscosidade e teor em água. Foram ainda realizados ensaios de determinação da constante de Henry (H) e do coeficiente de difusão (D) de CO2 nos diferentes DES preparados, pelo método de difusão em estado transiente. Para verificar o impacto da presença da enzima anidrase carbónica, diferentes concentrações da mesma (0,1 mg/g e 1 mg/g) foram adicionadas aos diferentes DES, e foi estudado o efeito da presença da mesma nos valores de H e D. Numa segunda etapa, membranas líquidas suportadas foram preparadas com os DES (com e sem a presença de enzima) e foram realizados ensaios de permeação gasosa aos gases puros CO2 e CH4 à temperatura de 30 oC e pressão de 0,7 bar. Foram determinados os valores de permeabilidade e de seletividade ideal e os resultados obtidos foram comparados com os disponíveis na literatura.
In this work, in a first step, different deep eutectic solvents (DES) were prepared, namely, choline chloride:urea, choline chloride:levulinic acid, betaine:urea and betaine:levulinic acid with a molar ratio of 1:2. After their preparation, they were characterized by measuring their density, viscosity and water content. Tests were also carried out to determine the Henry Constant (H) and diffusivity (D) in CO2 in the different DES, by the diffusion method in transient state. To verify the effect of the presence of the carbonic anhydrase enzyme, different concentrations (0,1 mg/g and 1 mg/g) were added to the different DES, and the impact of its presence on the values of H and D was assessed. In a second step, supported liquid membranes were prepared with the previous DES (with and without the presence of enzyme) and gas permeation tests were performed to pure gases CO2 and CH4 at a temperature of 30 oC and a pressure of 0,7 bar. The values of permeability and ideal selectivity were determined, and the results obtained were compared with those available in the literature.
In this work, in a first step, different deep eutectic solvents (DES) were prepared, namely, choline chloride:urea, choline chloride:levulinic acid, betaine:urea and betaine:levulinic acid with a molar ratio of 1:2. After their preparation, they were characterized by measuring their density, viscosity and water content. Tests were also carried out to determine the Henry Constant (H) and diffusivity (D) in CO2 in the different DES, by the diffusion method in transient state. To verify the effect of the presence of the carbonic anhydrase enzyme, different concentrations (0,1 mg/g and 1 mg/g) were added to the different DES, and the impact of its presence on the values of H and D was assessed. In a second step, supported liquid membranes were prepared with the previous DES (with and without the presence of enzyme) and gas permeation tests were performed to pure gases CO2 and CH4 at a temperature of 30 oC and a pressure of 0,7 bar. The values of permeability and ideal selectivity were determined, and the results obtained were compared with those available in the literature.
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Keywords
Solventes Eutécticos Membranas líquidas suportadas Anidrase Carbónica Separação de CO2 Deep Eutectic Solvents Supported Liquid Membranes Carbonic Anhydrase CO2 Separation