Dissertation > Excellent graduate degree dissertation topics show

Thermodynamic Model and Simulation for Desorber and Hydrolyzer of Urea Process

Author: FuXueMei
Tutor: WeiShunAn
School: Chongqing University
Course: Chemical Engineering and Technology
Keywords: Ammonia–Carbon dioxide–Water–Urea VLE the extended UNIQUAC model the interactive-energy parameters
CLC: TQ441.41
Type: Master's thesis
Year: 2011
Downloads: 81
Quote: 0
Read: Download Dissertation

Abstract


Based on the comprehensive analysis of the existing thermodynamic model of NH3–CO2–H2O–Urea （ACWU） system, this paper collected the vapor-liquid equilibrium experiment data and diagrams under different temperature and pressure of ACWU system. Its vapor-liquid equilibrium thermodynamic model is established with the activity coefficient method.While establishing the system of ACWU vapor-liquid equilibrium in which the hydrolysis reaction can be neglected at the conditions of temperatures from 60℃to 160℃, pressures up to 3.0MPa and the mole fraction of NH3 up to 0.3, the activity coefficients of the real species in liquid phase was described by the extended UNIQUAC equation and the fugacity coefficients of vapor phase was calculated by the SRK equation of state. To describe vapor-liquid equilibrium better, experimental data at the same condition is added up, but the mole fraction of NH3 is up to 0.2. The temperature was taken into account in describing the interaction energies’contribution to the excess Gibbs energy, and the interaction energy parameters were regressed by the simplex method. The model can also be used for the simulation and calculation of desorber.The average relative error between calculations of pressure from 37 groups’data of ACWU system and literature data is 9.14%, and that between calculations of pressure from 390 groups’data of ACW system and literature data is 2.77%. It turns out that the model can predict vapor-liquid equilibrium of ACW and ACWU system under wider range of tempreture, pressure and concentration. It also provides a solid theoretical basis for simulation, calculation and optimizing of the equipments in the recovery system at mesolow pressure.

Related Dissertations

  1. Vapor-Liquid Equilibria for Multi-component Mixed Refrigerants at Cryogenic Temperature Range,TB61
  2. Diphenyl carbonate equilibrium studies related to high-pressure synthesis system,O642.42
  3. Study on Phase Equilibria of Binary Systems Containing Carbon Monoxide,O642.42
  4. Phase Equilibria of Binary Systems of Synthesis Dimethyl Carbonate by Oxidation Carbonylation of Dimethyl Ether and High Pressure Solid-liquid Equilibria Research,O642.42
  5. Study on Catalytic Reactive Distillation Process Intensified by Microwave Irradiation,TQ028.31
  6. The Green Application on Extraction Separation Ethanol-Water with Ionic Liquids,TQ202
  7. Study on Supporting Technology in Virtual Learning Environment,TP391.9
  8. A Numerical Study on Supercritical Evaporation of Dimethyl Ether Droplets,TK16
  9. Studies on Vapor-Liquid Equilibria and Liquid-Liquid Equilibria for Ethanol(Isopropanol)-Water-Mixed Solvent,O642
  10. Properties of Two Organic Solvents Used for the Recovery of Maleic Anhydride,O657.9
  11. Study on Properties of Desulfurizers for Liquified Petroleum GAS,TE624.8
  12. The Simulation Study of Absorption Section in Rectisol Wash Unit,TQ202
  13. Study on a New Process of Refining the Coking Benzene by Extractive Distillation,TQ522.6
  14. Absorption of organic waste management problems of synthetic leather,X794
  15. HFP and HFPO separation of the mixture and process optimization,TQ202
  16. Composite extractive distillation of ethyl acetate - ethanol - water research,TQ202
  17. Perfluorinated propylene and mixtures HFPO Separation Technology,TQ028
  18. Fine salt extraction separation of methyl acetate - methanol research,TQ028
  19. Gibbs Ensemble Simulates for Vapor Liquid Equilibria of Binary Mixture Fluids,O642
  20. More specifications methanol distillation Modeling and Simulation,TQ205
  21. ACW VLE systems research,O642

CLC: > Industrial Technology > Chemical Industry > The chemical fertilizer industry > Nitrogen > Amide nitrogen fertilizer > Urea
© 2012 www.DissertationTopic.Net  Mobile