Estudo do processo de limpeza de membrana ceramica e obtenção de lecitina de soja por ultrafiltração seguida de diafiltração / Cleaning process in ceramic membrane used to soybean oil degumming and lecithin production by diafiltration

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

One of the objectives of this work was to study the cleaning process of a 0.01mm pore size ceramic membrane. The operational conditions used at eigth ultrafiltration process realized were 40°C of temperature and 1.0bar and 3.4m/s of transmembrane pressure and cross flow velocity. After each ultrafiltration it have been studied the influence of transmembrane pressure, tangential flow velocity and permeate valve position on the membrane cleaning process realized by pure hexane recirculation. Four different cleaning associated conditions were tested: low transmembrane pressure (0.5bar) and high cross flow velocity (5.0m/s); high transmembrane pressure (2.0bar) and low cross flow velocity (1.0m/s); intermediate transmembrane pressure and cross flow velocity, 1.0bar 3.4m/s; low transmembrane pressure (0.5bar) and high tangential flow velocity (5.0m/s) keeping permeate valve opened. The best condition evaluated to membrane cleaning process was the application of high cross flow velocity and low transmembrane pressure that have been recovered the original flux, took with pure hexane, in 85 minutes. The intrinsic membrane resistance, fouling resistance and polarized gel layer resistance were calculated and was concluded that the major resistance to permeate flux was the intrinsic membrane resistance followed by fouling resistance and polarized gel layer resistance. Concentration and diafiltration process in 0.01mm pore size ceramic membrane have been studied in extraction and purification of soybean lecithin from ultrafiltrations retentate. The retentate had concentrated until a concentration factor of 3 and diafiltrated using two and four cicles. The soybean lecithin purified using two and four diafiltrations cicles result in an acetone insoluble matter of 69.7 and 90.7% respectively

ASSUNTO(S)

ultrafiltration lecitina ultrafiltração degumming ceramic membranes flux lecithin degomagem membrana ceramica fluxo - recuperação

ACESSO AO ARTIGO

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