EFFECT OF MEMBRANE DEGUMMING CONDITIONS ON PERMEATE FLUX AND PHOSPHOLIPIDS REJECTION

Abstract

The objective of this study was to investigate the performance of PVDF membrane in degumming of undiluted crude soybean oil by using reverse osmosis/ultrafiltration module. The effects of membrane degumming conditions including temperature, membrane pressure, feed velocity, and volumetric concentration factor on permeate flux and phospholipids rejection were evaluated statistically. The effect of membrane pressure and volumetric concentration factor on the permeate flux was found to be statistically significant (P<0.05). An 86.1 % rejection of phospholipids and a permeate flux of 11.19 L/m².h were achieved at 40⁰C, 20 bar pressure, 9L/min feed velocity and 5 volumetric concentration factor. The flux behavior of PVDF membrane was also studied. Behavior of permeate flux with process time showed two separate regions namely; falling permeate flux region and constant permeate flux region.  A second degree polynomial relationship was observed during falling permeate flux region; whereas a linear dependency was set for constant permeate flux region. A logarithmic equation was obtained when total process behavior was examined. 

Keywords

• Soybean oil,Phospholipids,PVDFmembrane,Ultrafiltration

MEMBRAN DEGUMMING KOŞULLARININ PERMEAT AKISI VE FOSFOLİPİDLERIN REDDEDİLMESİ ÜZERİNDEKİ ETKİSİ

Abstract

Bu çalışmanın amacı; ters osmos/ultrafiltrasyon modülü kullanılarak soya yağına uygulanan degumming işleminde polyvinylidene fluoride (PVDF) membranın performansının incelenmesidir. Membran degumming işlem koşullarının (sıcaklık, membran basıncı, besleme hızı, hacimsel konsantrasyon faktörü) permeat akısı ve fosfolipitlerin reddedilme yüzdesi üzerindeki etkisi istatistiksel olarak incelenmiştir. Membran basıncının ve hacimsel konsantrasyon faktörünün permeat akısı üzerindeki etkisi istatistiksel olarak önemli bulunmuştur (P<0.05).. Membran sıcaklığının 40^oC, membrane basıncının 20 bar, besleme hızının 9L/dak ve hacimsel konsantrasyon faktörünün 5 olduğu işlem koşullarında  fosfolipidlerin reddedilme yüzdesi 86.1, permeat akısı ise 11.19L/m².s olarak belirlenmiştir. Ayrıca PVDF membranın akı davranışı da incelenmiştir. Permeat akısının işlem süresi ile değişimi; akının sürekli düşme gösterdiği birinci bölge ve akının sabit kaldığı ikinci bölge olmak üzere iki bölgede tanımlanmıştır. Düşen akı bölgesi 2. dereceden polinomiyal, sabit akı bölgesi doğrusal, tüm işlem için  logaritmik model geliştirilmiştir.

Keywords

• Soyayağı,Fosfolipid,PVDFmembran

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