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分段蒸發(fā)與冷凝對(duì)分子蒸餾過(guò)程的影響
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    摘要:

    在對(duì)分子蒸餾液膜表面流體流動(dòng)和傳質(zhì)傳熱分析的基礎(chǔ)上,，建立了二維分子蒸餾模型。通過(guò)二組分物系模擬仿真，研究了分段蒸發(fā)與冷凝對(duì)蒸餾量,、目標(biāo)組分質(zhì)量分?jǐn)?shù)和液膜表面溫度的影響,。研究結(jié)果表明：通過(guò)分子蒸餾分段冷凝可以減少實(shí)際蒸餾過(guò)程中由于脫氣不完全造成的“噴濺”現(xiàn)象,、冷凝面分子返蒸發(fā)效應(yīng)和得到質(zhì)量分?jǐn)?shù)梯度較大的目標(biāo)組分,，并可以增大蒸餾量,。分子蒸餾的分段梯度升溫蒸發(fā),，導(dǎo)致蒸發(fā)液膜表面溫度的階躍式上升,，可以在一次分子蒸餾過(guò)程中分離蒸汽壓相差較大的多組分物料并得到所需質(zhì)量分?jǐn)?shù)要求的目標(biāo)組分。

    Abstract:

    In this study, balance equations of a binary mixture for molecular distillation were derived on the basis of the relation of heat and mass transfer in liquid films on both the evaporation and condensation surfaces. The effects of segmented condenser and evaporators on degree of evaporation, composition of condensate, surface temperature of evaporating and condensing film were studied. Results showed that influence of splashing on desired substance caused by insufficient removal of gases and re-evaporation were minimized by the segmented condenser. The component with larger mass concentration gradient of desired substance and increasement of evaporation degree were obtained. The temperature of evaporating film surface was increased through the rising temperature evaporation in segmented evaporator. The separation of mixtures with obvious different vapor pressures could be fulfilled and desired mass concentration of component could be obtained by the segmented evaporator.

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邵平,姜紹通,潘麗軍,孫培龍.分段蒸發(fā)與冷凝對(duì)分子蒸餾過(guò)程的影響[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2007,38(5):86-90.[J]. Transactions of the Chinese Society for Agricultural Machinery,2007,38(5):86-90.

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