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Thank you for the information. I went ahead and implemented the mole number derivatives (I had only implemented Temperature and Pressure derivatives so far). The only difference to the method you described is that each derivative is calculated using the Central Finite Difference method. This works v...

Hello all, I have developed a COBIA Standalone Thermodynamic Property Package which uses a 3rd-order Central Difference Method for the calculation of the various derivatives, as described in this article . It works quite well, producing results that are within 0.1% of those calculated trough perturb...