Miscellas membrane processing

Recently, polymeric ultrafiltration membranes were used for degumming crude soybean oil and removing phospholipids from the crude oil/hexane miscella (168). Crude soybean oil also can be de-acidified by methanol extraction of the free fatty acids and the extract separated into fatty acids and solvent by a membrane filter (169). A surfactant-aided membrane degumming also has been applied to crude soybean oil, and the degummed oil contained 20-58 ppm of phosphorus (170). Supercritical carbon dioxide extraction was shown to be an effective means of degumming (171). In this process, soybean oil countercurrently contacted supercritical carbon dioxide at 55 MPa and 75°C. The phosphorus content of the oil was reduced from 620 ppm to less than 5 ppm. Ultrasonic degumming was also successfully used to reduce the gum content of soybean oil (172). 

The process developed by Gupta (19-22) processed crude oils with a combination of UF membrane separation and silica gel column percolation. The soybean and rapeseed-hexane miscellas were passed through various UF membranes. The solvent was removed from the permeate, and the degummed oil was then treated with bleaching clay, silica, and/or acid and finally was steam deodorized to produce refined, bleached, and deodorized oil. The color readings of the oils obtained... 

Pagliero et al. [53] evalnated the recovery of solvent in miscella degummed snnflower oil/hexane with concentrations of oil between 25% and 45% (w/w). Manbranes were synthesized from PVDF, prepared by the process of phase inversion, and evaluated for their flow and selectivity toward the oil. Tests were performed in a 400 mL filtration unit, with an effective area of membrane equal to 31.66.10 m and agitation of 750 rpm. The best separation was achieved at pressures between 4 and 6 bar, and a tanperature of 50 C and 25% oil in miscella (w/w), corresponding to a flow of 30 L m h. 

Figure 3.15 Processing of vegetable oil miscella in a hybrid membrane system.

Milk, flavour, 169 MILLS process, 241 Miscella refining, 198 Mitochondria, role in /8-oxidation, 494 Model membranes, NMR spectroscopy, 418... 

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