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Separation of Benzene and n-Heptane by Extractive/Extractive Distillation with Furfural Comppsite Extractant

Author: YaoChunYan
Tutor: DongHongXing
School: Harbin Engineering University
Course: Chemical Engineering
Keywords: Benzene - n-heptane The furfural add potassium thiocyanate complex solvent Salt extraction Extractive Distillation with Salt Tan - Wilson model association
CLC: TQ202
Type: Master's thesis
Year: 2008
Downloads: 107
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Abstract


Benzene is an important basic chemical raw materials, can be used to synthesize a variety of fine organic chemical intermediates, and its main source of petroleum benzene, coking benzene, petroleum benzene in short supply in the global market, and the cost is higher, making the production of coking benzene by more and more attention. The main impurities in hydrorefining after coking benzene alkane is n-heptane, cyclohexane, etc., accounting for more than 90% of the impurities. Since these impurities with similar boiling point of the benzene, it is difficult by conventional distillation methods for separation. Commonly used method for the removal of impurities in the benzene azeotropic distillation, extractive distillation, but has its own shortcomings. The salt effect separation Following the extractive distillation, azeotropic distillation and other special rectification method for separation separation factor close to 1 mixture another way. It is when the salt is added to the solution, the salt and the type of interaction of molecules of each component to be separated, so that balanced by the changes in the composition, leading away from the 1 to the separation factor, enabling the separation of the mixture. Compared with the extractive distillation, azeotropic distillation, separation of salt effect by simply adding a small amount of solid salt, you can achieve better separation. In this paper, furfural as the Solvent Selection salt extraction and extractive distillation with salt and carried out research on the separation of benzene and n-heptane. Separation furfural plus potassium thiocyanate salt for complex solvent extraction separation of benzene - n-heptane experimental results show that: solvent ratio of 1.0 to 2.0:1, potassium thiocyanate concentration of 5.0% to 10% (mass fraction) best. Add potassium thiocyanate can make the allocation of n-heptane ratio of from 2.71 to 11.54, while the selectivity coefficient of the solvent is from 3.44 to 6.0. Using five crossflow extraction separation of benzene and n-heptane, n-heptane to obtain a purity of up to 99.21% fraction. Salt extractive distillation experiment investigated the influence of the type of solvent, the solvent ratio, salt type, factors such as the relative volatility of benzene and n-heptane. The experimental results show that, using the the furfural composite solvent, the solvent ratio is 1, n-heptane improve the relative volatility of benzene to 2.243, 0.411 single furfural solvent. It is suggested that the separation effect than conventional extraction distillation has obvious advantages of extractive distillation. On an experimental basis, benzene - n-heptane - furfural - potassium thiocyanate system vapor-liquid equilibrium data associated with Tan-Wilson model, get good results, the mean square error of only 0.0083.

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