| The condensate water is less pollution, the Pollution material in thewater is single and the ion concentration in the water is low, so it has thepotential to renewable. Taking condensate water containing organic acidcame from VC producing section as research object. Two methods ofLiquid-liquid extraction&GC-MS and ion-exchange extraction&GC-MS to analysis the kinds and concentration of the organic acid wereestablished, the conditions of the two methods were optimized. Basing onthe analysis results from GC-MS, the Reverse Osmosis MembraneTreatment Technology was chosen as the renewable method. The effectsof water temperature, membrane pressure and pH on retention rate oforganic acid in condensate water, as well as the retention mechanism ofreverse osmosis membrane were discussed. The economic benefits of theprocess were accounted. The result indicated that:GC-MS could detect and completely separate formic acid, aceticacid, propionic acid, butyric acid, pentanoic acid, isobutyric acid and2-methyl-butyric acid. The standard deviations of the two methods were0.077、0.073、0.018、0.021、0.011、0.021、0.019and0.024、0.05、0.09、0.05、0.02、0.02、0.05、0.06.Mixed some acetone into ethyl acetate could improve extractionefficiency, when extracted organic acids in the water by liquid-liquidextraction method. When the Mixed concentration of the acetone andethyl acetate was2:1, the extraction efficiency was good. Extractionneed to repeat8times when using10ml extractant and10ml water.The organic acid recovery rates are67%、15%、61%、56%、65%、70%、46%、47%.Optimizing the conditions of the ion-exchange extraction to get ahigher recovery rate, adjust water sample pH to7, join0.2ml waterinto extraction column and then stalling15min, the adsorption effectis good, when extract6times with2ml acetone with0.5%HCL, theelution efficiency is good. The organic acid recovery rates are92.55%、83.48%、92.38%、101.4%、93.82%、97.24%、92.87%、93.81%。Comparison results show that: ion-exchange extraction ismore suitable for extracting organic acid from water. The extractionefficiency is higher. The operation is more security, and have noorganic solvent wasted.Optimizing the conditions of the operation of the reverse osmosismembrane equipment could get a higher interception rate. retentionrate of butyric acid, pentanoic acid and2-methyl-butyric acid could reach100%when water temperature at20℃-40℃, pressure at0.5MPa-1.5MPa, PH at4-10, while that of formic acid, acetic acid,propionic acid and carproic acid went down with a rising of watertemperature and rose with an increase of pressure and PH. The waterrecovery increased with a rising of water temperature and an increaseof pressure. The mechanic screening of reverse osmosis membraneand the interaction between organic acid and membrane attributed tothe retention effect on organic acid.According to the change rule of the retention rate and the waterproduction rate in different conditions, set operation parameters of thetest equipment as follows: operation in room temperature, general at20℃-30℃; PH adjust to6-7; pressure adjust to1.5Mpa. In theseconditions the water quality is: pH is6-7, conductivity is less than10μs/cm, TOC is less than10mg/l, the water production rate is morethan70%, can meet the requirements of the water quality used in thepharmaceutical factory. The economic accounting results show that:The cost of the water processed by the reverse osmosis membraneequipment is4.76yuan/ton, compare to the cost of8yuan/ton waterbought by the pharmaceutical factory, it can save3.24yuan/ton. |
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