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Study on the Application of Membrane Separation Technology to Purification, Concentration of Tomato Skin and Grape Skin Pigment Extract

Author: ShiXiaoBo
Tutor: ReHeMan
School: Xinjiang Agricultural University
Course: Of Food Science
Keywords: Membrane separation Purification Concentrate Tomato skin Grape skin Pigment extract
CLC: TS264.4
Type: Master's thesis
Year: 2010
Downloads: 207
Quote: 2
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Abstract


In this paper, by examining different aperture water flux and pigment tomato skins, grape skin pigment extracts as raw materials, the corrosion resistance of different membrane materials selection applies to pigmented solvent extract purified, concentrated membrane material; retention rate to select the best of the membrane pore size. On this basis, explore purified, operating pressure, operating temperature and the flow rate of the membrane flux in the enrichment process, and to determine the best of concentration of the pigment extract. In addition, through single factor and orthogonal experiments to optimize the the membrane module cleaning process conditions. Corrosion resistance test on the the four material film of the RC, PVDF, PTFE, PES obtained: RC membrane resistance ethyl acetate, ethanol corrosion resistance Preferably, the three other film poorly tolerated. The highest porosity the RC membranes in the four membrane material. A different aperture membrane pure water flux, the solvent flux and the measurement results show that the macromolecular substance, pigment rejection ratio: MWCO 30kDa, 500 Da RC membrane applicable to tomato skin pigment purified extract and concentrated. MWCO were a 1kDa the RC film, 300Da nano PTFE films suitable for purification and concentration of the extract of grape skin pigment. Analysis the pigment extract purified, concentrated in key process parameters affect the membrane flux obtained: tomato skin pigment purified extract the optimum operating pressure 0.10MPa, the operating temperature of 35 ° C, the the material liquid flow 53.50m / s ; concentrated the best technology for the operating pressure 0.60MPa, the feed temperature was 40 ° C, flow rate 53.50m / s, in this condition, the concentrated 30 times. Purified extract of grape skin pigment of the optimum operating pressure 0.15MPa, the operating temperature of 25 ° C, the solid to liquid flow rate 71.34m / s; concentrated the optimum operating pressure 0.80MPa feed temperature was 50 ° C, flow rate 71.34m / s, concentrated under this condition to the best multiples of 25. Pollution caused by extracts of purified tomato skin pigment membrane cleaning conditions single factor and orthogonal experiments, get the best cleaning conditions as the cleaning agent 1% NaOH 0.1% NaClO cleaning time 30min, the cleaning temperature 40 ° C, in this condition, the membrane flux recovery rate of 93.28%. Concentrated tomato skin pigment extract the best cleaning process: Second pumped into distilled water pump filter, wash away the film filtration device of residual pigment extract, use complex chemical cleaning agents, cleaning 30min at 40 ℃; acetate ethyl ester rinse with distilled water to wash 10min. Under these conditions the membrane flux recovery rate reached 98%. Degree of membrane flux decline than in the process of purification of grape skin pigment extract purified tomato skin pigment extract small and therefore purified lycopene extract membrane cleaning conditions, membrane flux recovery rate can reach 95% or more. Concentrated grape skin extract pigment membrane cleaning process: distilled water pump into the filter, wash away residual pigment extract washed with distilled water 10min; Second pumped composite cleaning agent, cleaning 30min at 40 ℃; then distilled water rinse cycle membrane filtration equipment 30min, membrane flux recovery rate can reach 96% or more. Grape skin pigment extract, for example, by comparing nanofiltration concentrated and vacuum concentrated by rotary evaporation, concentration factor, pigment quality, energy consumption differences: in the same concentrated time, the nanofiltration multiple vacuum evaporation multiples of its pigment content and chromatic aberration and concentrated less, and nanofiltration energy consumption is significantly higher than the vacuum rotary evaporator concentrates energy consumption low, reflecting the great economic benefits.

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