Thermodynamics Research Center database

Wilhoit, R. C. Documentation for the TRC Source Database, Thermodynamics Research Center, College Station TX, 77843, Nov. (1999) 207. 

TRCTHERMO database, TRC Thermodynamics Tables Hydrocarbons and Non-Hydrocarbons, Thermodynamics Research Center, Texas A M University System, College Station, Tex., July 1993. 

The Thermodynamics Research Center staff have assigned an uncertainty value to each observed and recommended density value listed in the tables. The tme value of the property has a 95% probability of being in the range covered by + or - the uncertainty about the reported value. Assignment of uncertainty is a subjective evaluation based upon what is known about the measurement when the value is entered into the database, and includes the effects of all sources of experimental error. The errors have been propagated to the listed density at the reported temperature. Uncertainties reported by the investigators are considered but not necessarily adopted. Often, investigators report repeatability, but they usually do not provide uncertainty. 

Thermodynamics Research Center, NIST Boulder Laboratories, M. Frenkel director. Thermodynamics Source Database in NIST Chemistry WebBook, NIST Standard Reference Database Number 69, eds. P. J. Lin-strom and W. G. Mallard, July 2001, National Institute of Standards and Technology, Gaithersburg MD, 20899 (http //webbook.nist.gov). 

A recent development is the creation of an electronic database from which particular properties can be retrieved on demand [3]. This work is being lead by the Thermodynamics Research Center, which is now part of the National Institute of Standards and Technology at Boulder, Colorado. 

Ionic Liquids Database (IL Thermo), Thermodynamics Research Center, National Institute of Standards and Technology, Boulder, CO, USA, http //ilthermo. boulder.nist.gov/ILThermo/mainmenu.uix... 

TRC Databases for Chemistry and Engineering Vapor Pressure. 1996. Thermodynamics Research Center. 

TRC Databases in Chemistry and Engineering. TRC Thermodynamic Tables Version 1.0. Thermodynamic Research Center, Texas A M University, College Station. Texas, 1994. This is a continuation of the American Petroleum Institute Project 44 Selected Values of the Properties of Hydrocarbons and Related Compounds. ... 

Many handbooks, including this one, contain an extensive compilation of liquid density data. These same sources often include liquid viscosity data, although fewer experimental data may be available for a particular compound. Available data compilations include those by Wypych, Handbook of Solvents (ChemTech, 2001) Wypych, Solvents Database, CD-ROM (ChemTec, 2001) Yaws, Thermodynamic and Physical Property Data, 2d ed. (Gulf, 1998) and Flick, Industrial Solvents Handbook, 5th ed. (Noyes, 1998). In addition, viscosity data for Ci—C28 organic compounds have been compiled by Yaws in Handbook of Viscosity, vols. 1—3 (Elsevier, 1994). Density and viscosity data also are available from the Thermodynamics Research Center at the National Institute of Standards and Technology (Boulder, Colo.) and from the DIPPR physical property databank of AIChE. 

The NIST s Thermodynamics Research Center (TRC) has a large collection of pure-fluid thermodynamic and transport properties tables of recommended values and correlations exist both in paper form and in a computer database [12], The TRC has also produced books with comprehensive compilations for organic compounds (sometimes also available as software) for vapor pressure [17], liquid density [18], and ideal-gas heat capacity [29], in addition to a compilation on virial coefficients [32]. Their major archival database of experimental pure-component and mixture data is called Source [97] it is currently available only to members of their consortium. Some data for mixtures of organic compounds are published in the periodical Selected Data on Mixtures [49]. More information is at http //trc.nist.gov. 

Thermodynamics Research Center, TRC Thermodynamic Tables—Hydrocarbons and TRC Thermodynamic Tables—Nonhydrocarbons. Both are loose-leaf multivolume publications with supplements available on a subscription basis see http //trc.nist.gov. A software version of this database is X. Yan,... 

The Registry Number assigned by Chemical Abstracts Services, when available. When a CASRN is not available, numbers starting at 50000-00-0 identify compounds in the SOURCE Database maintained by the Thermodynamics Research Center. 

Data values were extracted from the SOURCE database by suitable software and then screened to identify the "best" (most accurate) values. The selection was based on a comparison of the estimated uncertainties of values for the same substance. The selection also took into account the distribution of virial coefficients with temperature. An appropriate algorithm has been developed at the Thermodynamics Research Center and has been used for several compilations. Briefly, the uncertainty for each data valne in a set was compared to a weighted mean of the uncertainties of all the other values. The weighting factor was an inverse exponential function of the absolute value of the difference between the temperature of the value being evaluated and the temperatures of the other values. The screeiung level, the size of the data set and range of temperatures it covered determined the parameters used in the comparison. Additional details are given in [96-wil/mar]. Selected values are marked with various symbol in the tables of data. 

Frenkel, M. Kabo, G. J. Marsh, K. N. Roganov, G. N. Wilhoit, R. C. Thermodynamics of Organic Compounds in the Gas State, Thermodynamics Research Center College Station, 1994. Volumes I and II. This database can be considered as an update of Stull, Westrum Sinke (Stull, D. R. Westrum, E. F., Jr. Sinke, G. C. The Chemical Thermodynamics of Organic Compounds-, Wiley New York, 1%9). 

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