Daubert

Daubert has recently published a new method (Hydrocarbon Processing, September 1994, page 75) to convert D 86 data to TBP results using the following equations ... 

Conversion of D 86 test results into an atmospheric TBP (Daubert s method). 

Table 4.7b Coefficients for converting a D 2887 curve into an ASTM D 86 curve [Equation 4.23] (Daubert s method). ...

D. P. Danner and T. E. Daubert, Manualfor Prediction Chemical Process Design Data, AIChE, New York, (extant 1987). 

T. E. Daubert, R. P. Danner, H. M. Sibul, and C. C. Stebbins, Physical and Thermodynamic Properties of Pure Chemicals Data Compilation, Taylor Francis, Bristol, Pa., 1995. 

R. Danner and T. Daubert, DIPPR 802 Data Prediction Manual, MIChE. University Park, Pa., 1986, pp. 7A1—7B2. 

P. A. Gupte, M. Nagvekar, R. P. Danner, and T. E. Daubert, Documentation of the Basis for Selection of the Contents of Chapters Phase Equilibrium in Manualfor Predicting Chemical Process Design Data, Design Institute for Physical Property Data (AIChE), (1987). 

T. E. Daubert, private communication. Department of Chemical Engineering, The Permsylvania State University, University Park, Pa., 1992. 

Conversion Factors and Mathematical Symbols James O. Maloney Physical and Chemical Data Peter E. Liley, George H. Thomson, D. G. Friend, Thomas E. Daubert, Evan Buck... 

Thomas E Daubert/ Ph D / Professor, Depadment of Chemical Engineering, The Penn-.sylvania State University. (Prediction and Correlation of Physical Propedies)... 

Compiled from Daubert, T. E., R. R Danner, H. M. Sibul, and C. C. Stebbins, DIPPR Data Compilation of Pure Compound Properties, Project 801 Sponsor Release, July, 1993, Design Institute for Physical Property Data, AlChE, New York, NY and from Thermodynamics Research Center, Selected Values of Properties of Hydrocarbons and Related Compounds, Thermodynamics Research Center Hydrocarbon Project, Texas A M University, College Station, Texas (extant 1994). 

For purposes of the API Technical Data Book (Daubert and Danner S), another modified Riedel equation (2-29) was chosen and found to fit hydrocarbon data well over the entire pressure range. Coefficients are given for several hundred hydrocarbons. 

Heat Capacity, C° Heat capacity is defined as the amount of energy required to change the temperature of a unit mass or mole one degree typical units are J/kg-K or J/kmol-K. There are many sources of ideal gas heat capacities in the hterature e.g., Daubert et al.,"" Daubert and Danner,JANAF thermochemical tables,TRC thermodynamic tables,and Stull et al. If C" values are not in the preceding sources, there are several estimation techniques that require only the molecular structure. The methods of Thinh et al. and Benson et al. " are the most accurate but are also somewhat complicated to use. The equation of Harrison and Seaton " for C" between 300 and 1500 K is almost as accurate and easy to use ... 

Ideal gas absolute entropies of many compounds may be found in Daubert et al.,"" Daubert and Danner," JANAF Thermochemical Tables,TRC Thermodynamic Tables,and Stull et al. ° Otherwise, the estimation method of Benson et al. " is reasonably accurate, with average errors of 1-2 J/mol K. Elemental standard-state absolute entropies may be found in Cox et al." Values from this source for some common elements are listed in Table 2-389. ASjoqs may also be calculated from Eq. (2-52) if values for AHjoqs and AGJoqs are known. 

Flash points, lower and upper flammability limits, and autoignition temperatures are the three properties used to indicate safe operating limits of temperature when processing organic materials. Prediction methods are somewhat erratic, but, together with comparisons with reliable experimental values for families or similar compounds, they are valuable in setting a conservative value for each of the properties. The DIPPR compilation includes evaluated values for over 1000 common organics. Detailed examples of most of the methods discussed are available in Danner and Daubert."... 

Whenever measured values of diffusivities are available, they should be used. Typically, measurement errors are less than those associated with predictions by empirical or even semitheoretical equations. A few general sources of data are Sec. 2 of this handbook, Schwartzberg and Chao Reid et al. Gammon et al. and Daubert and Danner. Many other more restricted sources are hsted under specific topics later in this subsection. 

Source Daubert, T. E., Petroleum Fraction Distillation Interconversions, Hydrocarbon Processing, September 1994, pp. 75-78. 

T. E. Daubert. Evaluation of four methods for predicting hydrate equilibria. GPA Res Rep RR-134, Pennsylvania State Univ, July 1992. 

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