recuperação da solução de soda cáustica usada no tratamento do couro bovino na produção de gelatina recovery of the sodium hydroxide aqueous solution used in the treatment of bovine leather for the production of gelatin

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ID: 155722
2008
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Abstract
No tratamento de couro bovino para a produção de gelatina utiliza-se uma solução de soda cáustica com função de dissolver substâncias orgânicas indesejáveis, como proteínas e gorduras. Para evitar seu descarte como efluente, procurou-se viabilizar um processo de purificação da soda cáustica, evitando seu desperdício e ainda tornando-o adequado para reutilização no processo. A microfiltração, a ultrafiltração e a nanofiltração são técnicas potenciais para esta separação, dependendo do tipo e tamanho dos sólidos existentes. Experimentos de ultrafiltração foram realizados na unidade de micro/ultrafiltração Koch Membrane System Model Protosep modified IV, nas pressões transmembrana de 2,5; 3,5 e 4,5 kgf/cm² e temperaturas de 25 e 50 °C. Utilizaram-se membranas cerâmicas (material TiO2/alfa-Al2O3) tubulares com diâmetro médio de corte de 0,01, 0,05 e 0,10 µm. O trabalho foi dividido em duas etapas: na primeira selecionou-se a melhor pressão para cada membrana, e na segunda adotou-se a pressão de 3,5 kgf/cm², usou-se uma alimentação centrifugada e outra peneirada para então definir a membrana. As melhores condições operacionais foram determinadas em termos de fluxo de permeado e qualidade de produto. Com os resultados obtidos, observaram-se as melhores condições operacionais: pressão de 3,5 kgf/cm², temperatura de 25 °C e membrana com diâmetro médio de poros de 0,01 µm.
The sodium hydroxide solution used in the treatment of bovine leather in the production of gelatin has the function of dissolving undesirable organic substances, such as proteins and fats. To avoid the discard of this solution as an effluent to the environment, the intention of this project was to develop a process of sodium hydroxide purification, avoiding the waste of the solution and making it appropriate to be re-utilised in the process. Ultrafiltration experiments were carried out in a micro/ultrafiltration unit, Koch Membrane System, model Protosep, modified IV, with transmembrane pressures of 2.5; 3.5 and 4.5 kgf/cm² and temperatures of 25 and 50 °C. The membranes used were tubular ceramic (material: TiO2/alpha - Al2O3) with an average diameter of 0.01, 0.05 and 0.10 µm. The study was divided in two steps: in the first, the best pressure for each membrane was selected, and in the second, a pressure of 3.5 kgf/cm² was adopted and two different forms of feeding were used to define the membrane. The best operational conditions were determined in terms of permeate flow and product quality. With the results, the following operational conditions were selected: pressure of 3.5 kgf/cm², temperature of 25 °C and membrane with average pore diameter of 0.01 µm.
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lima2008foodrecuperao Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Eduardo Rodrigues de Lima;Ricardo Araújo Oliveira;Miriam Carla Bonicontro Ambrosio-Ugri;Sueli Teresa Davantel de Barros;Carlos de Barros Júnior
Journal software - practice and experience
Year 2008
DOI
10.1590/S0101-20612008000100015
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612008000100015
Keywords
foods and food supplytechnology (general)

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