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首页> 外文期刊>Separation and Purification Technology >Purification of crude fatty acids using a PDMS-based composite membrane
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Purification of crude fatty acids using a PDMS-based composite membrane

机译：使用基于PDMS的复合膜纯化粗脂肪酸

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Crude FA obtained by acid hydrolysis of used frying oils was purified using a PDMS based composite membrane. During processing crude FA, FA preferentially permeated through the membrane increasing FA content from 86.5% to 90% while color compounds were substantially reduced (92.8%) improving the overall purity of FA. Studies with crude FA-used frying oil system showed that a good correlation existed between reciprocal of viscosity and permeate flux, both total as well as FA fluxes. As expected, FA flux showed a significant improvement in crude FA-hexane system besides improving the FA content to the extent of 97% without significantly affecting reduction of color (83-88%). Increase in pressure as well as hexane dilution improved the FA flux but marginally affected purity and color reduction. Preferential permeation was observed over a wide of hexane dilution almost throughout the entire range of X (weight ratio of FA in feed) but to a varying degree and the positive coupling was strong at very low and high concentrations of hexane and FA. A maximal J_(FA) (FA flux) of 4.4kg/(m~2 h) was obtained at X= 0.3 demonstrating an improvement of 11 fold achievable with appropriate hexane dilution at 1 MPa. In both crude FA-used frying oil and crude FA-hexane systems, the mean molar total permeate flux [ln(J_m)] showed a linear dependency on the mean molar volume [V_m] of permeate, which is in agreement with solution-diffusion or regular solution model.
机译：使用PDMS基复合膜纯化通过用过的煎炸油酸水解获得的粗制FA。在处理粗制FA时，FA优先渗透通过膜，从而将FA含量从86.5％增加到90％，同时显着减少了有色化合物（92.8％），从而改善了FA的整体纯度。用FA粗制油炸油系统进行的研究表明，粘度和渗透通量（总通量和FA通量）的倒数之间存在良好的相关性。正如预期的那样，FA助熔剂在将FA含量提高到97％的程度而未显着影响色泽降低（83-88％）的同时，在粗制FA-己烷体系中显示出显着改善。压力的增加以及己烷的稀释提高了FA的通量，但对纯度和颜色降低的影响很小。在几乎整个X范围内（进料中FA的重量比），在较宽的己烷稀释液中均观察到了优先渗透，但程度不同，并且在极低和高浓度的己烷和FA时，正偶合作用很强。 X = 0.3时，最大J_（FA）（FA通量）为4.4kg /（m〜2 h），这表明在1 MPa下用适当的己烷稀释后可以提高11倍。在FA粗制油炸油和FA-己烷粗制油系统中，平均摩尔总渗透物通量[ln（J_m）]与渗透物的平均摩尔量[V_m]呈线性关系，这与溶液扩散是一致的或常规解决方案模型。

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