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Aspen Plus - Is There A Function To Determine The Relative Quantites O

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#1 EdJones90


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Posted 11 September 2020 - 03:37 AM

Hi, it's me again....


I have a process that predicts the mass yield and ultimate analysis (CHONS, wt.%) of the various phases of an algal hydrothermal liquefaction process. So far, everything is being modeled as non-conventional materials so that I can directly manipulate the ULTANAL/PROXANAL and biochemical proximate with calculator blocks.


The four products of reaction are: bio-crude, aqueous-organics, gas, char. Each of these individual "products" is a complex mixture of tens to hundreds of individual components... A modelling nightmare to completely resolve.


Following published methods, I wish to approximate the content of each phase with 10-20 conventional components in the Aspen library. This method enables in the individual products being represented as a mixture of conventional species in Aspen, and allow extra downstream process to be modeled.


My key parameter is the predicted CHONS (dry wt. %) of each product. Currently I use the non-linear regression solving function within Excel or LibreOffice Calc to resolve the mass-frac of each conventional component required to give the desired CHONS of the mixture, however I'd prefer to have this built directly into the Aspen model.


I could easily write a function in Python that does the regression and returns an array of mass-fractions, but I don't know how to call an external function within a Fortran calc. block (if this is possible?), or even if Aspen has a non-linear solver type function built right in?


Hope this makes sense!

#2 Bobby Strain

Bobby Strain

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Posted 11 September 2020 - 09:19 AM

AspenTech support might help you.



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