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Application of a new gibbs energy equation to model a distillation tower for production of pure ethanol

Hashemi, N ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1002/ceat.201000569
  3. Abstract:
  4. A steady-state equilibrium-stage model based on MESH equations was proposed to simulate saline extractive distillation columns. The interaction parameters between each component of water-CaCl 2 and ethanol-water were obtained from mean ionic activity coefficients and vapor-liquid equilibrium (VLE) experimental data. Additionally, the interaction coefficients for the ethanol-CaCl 2 pair were fitted to experimental VLE data which were reported by Nishi for the ethanol-water-CaCl 2 system. It should be noted that adjustable parameters between each pair were considered to be temperature dependent. The results confirmed that the proposed model could accurately predict the experimental vapor-liquid equilibrium data for ethanol-CaCl 2-water systems. Finally, the validated model was coded using MATLAB software and was solved using the Wang-Henke method, including the VLE and enthalpy models. A steady-state equilibrium-stage model based on MESH equations was proposed to simulate saline extractive distillation columns. Results show that it is possible to produce pure ethanol with CaCl 2 as the separating agent, which is in agreement with previous experiments and simulations conducted by other researchers
  5. Keywords:
  6. Activity coefficients ; Ethanol ; Modeling ; Saline extractive distillation ; Simulation ; Adjustable parameters ; Distillation towers ; Ethanol-water ; Experimental data ; Extractive distillation ; Interaction coefficient ; Interaction parameters ; Matlab- software ; Mean ionic activity coefficient ; Model-based OPC ; Separating agents ; Simulation ; Temperature dependent ; Vapor-liquid equilibrium ; Vapor-liquid equilibrium data ; VLE data ; Water system ; Calcium chloride ; Distillation ; Liquids ; MATLAB ; Models ; Phase equilibria ; Water vapor ; Distillation columns
  7. Source: Chemical Engineering and Technology ; Volume 34, Issue 10 , 2011 , Pages 1715-1722 ; 09307516 (ISSN)
  8. URL: http://onlinelibrary.wiley.com./doi/10.1002/ceat.201000569/abstract;jsessionid=5AAD46360ED062421FE4EFFA489F392F.f04t01