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In the chemical , pharmaceutical production, often involving many azeotrope , Department of Applied ordinary distillation is difficult to achieve effective separation , the existing extractive distillation, azeotropic distillation and so you need to add a third component in achieving separation purposes also increases the complexity of the process , seeking more to address these things based separation method , has been the separation engineering research. This paper presents a separate azeotrope new method evaporated in vacuo separation process . This process operating under vacuum , the control system temperature below the azeotropic point , the two points in the separation process does not form an azeotrope , and rely on the components between the evaporation rate and diffusion speed difference , to break the azeotropic limit , to achieve separation purposes. This method does not require adding a third component , environment-friendly , as many binary azeotrope separation provides a new choice. This was intermittent evaporated in vacuo separate azeotrope experimental study incorporating four binary azeotrope of ethanol - water, ethanol - toluene, ethanol - cyclohexane , n-butanol - xylene at different pressure under operation , show some separation. On this basis , through the filler layer enhancement increases evaporation area , the establishment of a continuous vacuum evaporation separate experimental device for ethanol - toluene azeotrope system for a systematic study to obtain a satisfactory separation effect , and the effects of feed composition , feed rate , operating pressure and temperature experimental conditions on the vacuum evaporation separation process. Applied last gas-liquid inter- mass transfer theory , the diffusion coefficient theory and evaporation heat theory of the vacuum evaporation process of separation mechanism was analyzed , calculated under the experimental conditions of the substance diffusion coefficient and heat of evaporation , the experimental results to make a reasonable explanation further validate the vacuum evaporation process of separating the azeotrope feasible.
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