TECHICAL Series MATHEMATICS • INFORMATICS • PHYSICS Series PHILOLOGY Series ECONOMIC SCIENCES Sereies EDUCATIONAL SCIENCES Series LAW AND SOCIAL SCIENCES Series
Easy-to-use Mathcad Computer Methods for Interconversion of Petroleum Distillation Curves. Part 4: ASTM - EFV (Equilibrium Flash Vaporization) Conversion Using Composite Functions
(Transpuneri în Mathcad uşor de utilizat pe calculator ale metodelor de interconversie a curbelor de distilare ale fracţiunilor petroliere. Partea a 4-a. Proceduri de interconversie a curbelor ASRO (STAS) - VE (vaporizare la echilibru) folosind funcţii compuse)
Vol LXIV • No. 3/2012
Liviu Filotti
Universitatea Petrol-Gaze din Ploieşti, Bd. Bucureşti 39, Ploieşti
e-mail: lfilotti@upg-ploiesti.ro; lfilotti@yahoo.com

 Keywords   ASTM D 86, EFV, distillation, interconversion, Mathcad, petroleum.

 Abstract
The procedure developed by Riazi and Daubert [1] [2] for EFV (Equilibrium Flash Vaporization) curve prediction starting from ASTM distillation data is transposed into Mathcad. A legible and easy-to-use worksheet for direct and reversed (EFV to ASTM) conversions is thus provided. Both input and predicted distillation curves are represented as 7 rows x 2 columns matrices, where first column contains the %vol. and the second column the corresponding temperatures. Correlations of Riazi & Daubert needed in the procedure are written as functions and composite functions which allow the conversion from one type of distillation into the other by a mere call of single-argument function and with the initial distillation data as input. Examples with distillation data taken from [1] allowed the verification of the Mathcad-written version and illustrate its convenient utilization.

 Rezumat
Procedura elaboratǎ de cǎtre Riazi şi Daubert [1] [2] pentru predicţia curbei VE (Vaporizare la Echilibru) pe baza curbei de distilare ASRO (cf. SR ISO 3405:1998, în trecut STAS, cf. STAS 36-1980 ; echivalent cu ASTM D 86) este transpusǎ în platforma Mathcad. Este astfel prezentatǎ foaia de calcul Mathcad cu care se poate efectua atât conversia directǎ, de la curba ASRO la curba VE, cât şi conversia inversǎ, VE ASRO. Foaia de calcul permite o utilizare comodǎ, fiind totodatǎ uşor de citit, datoritǎ în particular sintaxei naturale a platformei Mathcad. Ambele curbe de distilare, iniţialǎ şi calculatǎ, sunt reprezentate sub forma unei matrici cu 7 linii şi 2 coloane, prima coloanǎ cuprinzând % volum distilat, iar a 2-a coloanǎ temperaturile corespunzǎtoare. Corelaţiile Riazi-Daubert folosite de cǎtre procedurǎ sunt scrise în Mathcad sub formǎ de funcţii sau funcţii compuse, ce fac posibilǎ în final conversia de la un tip la celǎlalt de curbǎ printr-o simplǎ apelare a unei funcţii de o singurǎ variabilǎ, curba de distilare iniţialǎ (datǎ). Exemplele furnizate, cu date preluate din literaturǎ [1], pe lângǎ ilustrarea modului convenabil de utilizare a foii de calcul, au permis verificarea versiunii Mathcad a procedurii.



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