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(Hereinafter referred to as oil feet) vegetable oil fatty acid production in the oil feet after processing of natural fatty acids after hydrolysis, distillation processes feet stay in the bottom of the distillation column material. Currently, oil foot mainly been prepared for the crude product of the remover, waterproof asphalt, artificial diet, did not achieve full utilization of resources. The purpose of this paper is that through degumming, deacidification, bleaching oil foot to miscellaneous, and oil-soluble additives used in alumina production. First, synthetic starch for oil feet unglued grafted polypropylene amide (SPAM). Investigated the morphology of corn starch and gelatinization temperature, pasting water consumption, caused by the impact of various factors on the dose, the amount of solvent, temperature, monomer concentration and HLB value polymerization. The results showed that the starch graft required before gelatinization, the starch gelatinization temperature of 80 ° C, 8% water for gelatinization, initiator concentration of 0.070%, and the amount of the solvent 50.0mL / g, acrylamide monomer concentration of 0.55 mol / L, the reaction temperature is 60 ℃, emulsifier HLB value of 8.5, starch grafted polyacrylamide grafted best results. Starch grafted polyacrylamide characterized and analyzed by infrared spectroscopy. Followed by degumming, decolorization, deacidification means oil feet to the complex processing. Determine the optimum starch grafted polyacrylamide (SPAM) flocculation unglued, or 0.03% of the amount of SPAM, a temperature of 50 ° C, the kinematic viscosity of the oil-foot by 772.5mm2 / s of reduced 370.0mm2 / s. Found the ammonia complex demulsifier ethanol, at 80 ° C and a stirring rate of 150r/min under the deacidification operating rate of 84.7%, deacidification. Activated clay, activated carbon, hydrogen peroxide decolorant oil feet Decolorization. Of orthogonal experiment to determine the amount of activated clay, activated carbon, hydrogen peroxide dosage, hydrogen peroxide bleaching temperature, activated clay bleaching time the best value of the main factors, that is, when the above factors were 8%, 3.5%, 1.2% at 55 ° C, 35min decolorization rate of 71.3%. Finally, the study of the oil-soluble additives in the oil leg portion alternate alumina production. Found that the oil-soluble additive Hb and Hc were oil feet instead of 20% and 15% obtained after the new additives H2 and H3, its ability to enhance the decomposition rate of the sodium aluminate solution is substantially considerable Hb and Hc. Alumina decomposition experiment to find the best H2 and H3 added time and the amount of 8h, 100mg / L and 15h when 75mg / L.
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