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[Delano]

Hi Everyone

I was hoping that someone could once again save me.

I am trying to create a model of an ammonium nitrate plan in aspen plus but i have come a long the following error.

* WARNING IN PHYSICAL PROPERTY SYSTEM
PARAMETER PLXANT (DATA SET 1) FOR COMPONENT NH4NO3:
UNREASONABLE VAPOR PRESSURE CALCULATED AT TEMPERATURE UPPER BOUND.
VALUE SHOULD BE LESS THAN MAXIMUM ALLOWABLE VALUE
= 0.10000E+36 N/SQM. PLEASE CHECK YOUR INPUT FOR THE
ANTOINE PARAMETERS.

* WARNING IN PHYSICAL PROPERTY SYSTEM
NRTL BINARY PARAMETERS FOR ALL COMPONENT PAIRS ARE ZERO,
YOUR RESULTS MAY NOT BE ACCURATE. PLEASE REVIEW AND PROVIDE BINARY
PARAMETERS AS APPROPRIATE.

Flowsheet Analysis :

COMPUTATION ORDER FOR THE FLOWSHEET:
B1

->Calculations begin ...

WATSON HEAT OF VAPORIZATION MODEL HAS MISSING PARAMETERS:
DHVLWT/1ST ELEMENT (DATA SET 1) MISSING FOR COMPONENT NH4NO3

DHVLWT/2ND ELEMENT (DATA SET 1) MISSING FOR COMPONENT NH4NO3

****PROPERTY PARAMETER ERROR
ERRORS ENCOUNTERED IN CALCULATION OF LIQUID MIXTURE MOLAR ENTHALPY USING
OPTION SET NRTL FOR H

! Calculations stopped because of missing property parameters


I get the same error no matter what property method i choose. Any suggestions?

Cheers

Edited by Delano, 28 July 2012 - 11:30 PM.