Degomagem of miscela of maize oil (Zea mays L.) for ultrafiltration. / Degomagem de miscela de oleo de milho (Zea mays, L.) por ultrafiltração.

AUTOR(ES)

Marcia Pereira de Souza

DATA DE PUBLICAÇÃO

2004

RESUMO

Crude corn oil possess undesirable substances that affect the quality of the final product, among them are phospholipids, pigments, waxes and free fatty acids, Where some of them can be separate, at least partially, through ultrafiltration. Some works have been developed applying this technology in degumming of vegetable oils, and removal of phospholipids, with reasonable success related to retention although not always with a good permeate flux. In this way the membrane separation processes present themselves as a technological alternative of great interest once this is considered a clean technology. So the goal of this work was to evaluate the usage of ultrafiltration (UF), for the degumming of crude corn oil micelle, through a multichannel (19) alumina ceramic membrane, pore diameter 0.05 microns and penetration area of 0.2 m2. The temperature effect was verified, the transmembrane pressure influence, tangential velocity and the percentage of oil in the micelle were studied through a complete experimental design 23, which responses were the retention of phosphorous and permeate flux. A high UF assays repeatability was observed and the permeate fluxes with a concentration factor (FC) of 4 varied between 40 and 120 kg/hm2, expressive and not yet found on the literature values. The temperature has improved the permeate flux although it has decreased very little the phosphorous retention. It was verified a great negative influence of the micelle oil percentage followed by the positive influence of the tangential velocity over the permeate flux. The transmembrane pressure has not significantly interfered. While the phosphorous retention was superior to 65% reaching 93.5%, resulting in a phosphorous content between 22 and 124 mg.Kg-1 for the permeate oil FC 4. It was also verified that the transmembrane pressure and the micelle oil percentage exercised a positive effect upon the retention percentage, whereas the outflow tangential velocity presented a negative influence.

ASSUNTO(S)

corn oil ultrafiltração ultrafiltration phospholipids membranes oleo de milho membranas (tecnologia) micella degumming

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