The separation of water/acetic acid mixtures by conventional distillation is not suitable for industrial applications. With reference to terephthalic acid production, we selected p-xylene as an entrainer to run an azeotropic distillation, being the principal raw material of the process. The phase equilibria of the binary and ternary systems are discussed, and the UNIQUAC activity coefficient model was adopted for the simulations. A robust nonlinear regression of the UNIQUAC binary interaction parameters was performed with the BzzMath optimizer on the basis of the literature equilibrium data. Using a batch and a micropilot distillation column, 5 m height and 15 trays, run in different operative configurations, the feasibility of the process was demonstrated. In addition, the experimental data were compared with the simulations obtained with the SimSci PRO/II process simulation software. An overall tray efficiency of 0.53 was estimated and adopted in all simulations. The separation results confirmed that p-xylene is a suitable entrainer to separate acetic acid/water mixtures.

Simulation and related experimental validation of acetic acid/water distillation using p-xylene as entrainer / C. Pirola, F. Galli, F. Manenti, M. Corbetta, C.L. Bianchi. - In: INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH. - ISSN 0888-5885. - 53:46(2014), pp. 18063-18070.

Simulation and related experimental validation of acetic acid/water distillation using p-xylene as entrainer

C. Pirola
Primo
;
F. Galli
Secondo
;
C.L. Bianchi
Ultimo
2014

Abstract

The separation of water/acetic acid mixtures by conventional distillation is not suitable for industrial applications. With reference to terephthalic acid production, we selected p-xylene as an entrainer to run an azeotropic distillation, being the principal raw material of the process. The phase equilibria of the binary and ternary systems are discussed, and the UNIQUAC activity coefficient model was adopted for the simulations. A robust nonlinear regression of the UNIQUAC binary interaction parameters was performed with the BzzMath optimizer on the basis of the literature equilibrium data. Using a batch and a micropilot distillation column, 5 m height and 15 trays, run in different operative configurations, the feasibility of the process was demonstrated. In addition, the experimental data were compared with the simulations obtained with the SimSci PRO/II process simulation software. An overall tray efficiency of 0.53 was estimated and adopted in all simulations. The separation results confirmed that p-xylene is a suitable entrainer to separate acetic acid/water mixtures.
heterogeneous azeotropic distillation; acid dehydration system; reactive distillation; dynamic simulation; acetate synthesis; phase-equilibria; feed impurity; design; column; mixtures
Settore ING-IND/25 - Impianti Chimici
Article (author)
File in questo prodotto:
File Dimensione Formato  
[53] iecr 53(2014)19063-19070.pdf

accesso riservato

Tipologia: Publisher's version/PDF
Dimensione 815.18 kB
Formato Adobe PDF
815.18 kB Adobe PDF   Visualizza/Apri   Richiedi una copia
Pubblicazioni consigliate

Caricamento pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/249833
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 16
  • ???jsp.display-item.citation.isi??? 12
social impact