NRLT MODEL (NON-RANDOM TWO LIQUID)

“Process design “


NRTL MODEL  


(NON-RANDOM TWO LIQUID)


NRTL MODEL IS a one of fluid package in HYSYS it is belongs to  activity model . The 

 Activity Models handle highly non-ideal systems and are much more empirical innature when 

compared to the property predictions in the hydrocarbon industry. Polar or non-ideal chemical 

systems are traditionally handled using dual model approaches. 

The Non-Random-Two-Liquid (NRTL) equation is an extension of the Wilson equation.It uses

 statistical mechanics and the liquid cell theory to represent the liquid structure. It is capable of representing VLE, LLE, and VLLE phase behaviour. 

The NRTL property package is used for chemical systems and HF Alkylation with highly non-ideal chemicals.

NRTL uses the following calculation methods: 
For liquid: 

• NRTL method for VLE 

• Cavett method for Enthalpy and Entropy. 
For vapour: 

• Ideal Gas, RK, Virial, Peng Robinson, and SRK methods for VLE 

• Ideal Gas, RK, Virial, Peng Robinson, and SRK methods for Enthalpy and Entropy Like the 

Wilson equation, the NRTL is thermodynamically consistent and can be applied to ternary and

 higher order systems using parameters regressed from binary equilibrium data. It has an 

accuracy comparable to the Wilson equation for VLE systems. The NRTL equation in HYSYS

 contains five adjustable parameters (temperature 

dependent and independent) for fitting per binary pair. The NRTL combines the advantages of 

the Wilson and van Laar equations

• Like the van Laar equation, NRTL is not extremely CPU intensive and can represent LLE 

quite well. 

• Unlike the van Laar equation, NRTL can be used for dilute systems and hydrocarbon-alcohol 


mixtures, although it may not be as good for alcoholhydrocarbon systems as the Wilson equation. 

• The five adjustable parameters for the NRTL equation in HYSYS are the aij, aji,bij, bji, and aij terms. 

For binary mix the following eq. are used: 






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