Evaluated Standard Thermophysical Property Values
Design Institute for Physical Properties
Sponsored by AIChE

DIPPR 801s Mission Statement

To create and make available a database of evaluated process design data for industrially important chemicals by building upon and enhancing the value of the DIPPR Data Compilation, satisfying industry needs for accurate and complete thermodynamic and physical property data for process engineering in a rapidly changing business and technical environment.

DIPPR 801 Project Description

The objective of project 801 is to create a DIPPR Database of Evaluated Process Design Data of physical, thermodynamic, and transport properties for industrially important chemicals used in chemical process and equipment design. The DIPPR 801 database consists of experimental thermophysical data and, when necessary, estimated values that have been reviewed to ensure the greatest accuracy possible. Also including temperature-dependent correlation coefficients, references, data quality codes, background information, such as molecular structure, synonyms, hazard properties, miscellaneous properties, notes, and explanations, DIPPR 801 exists in a computer-accessible form that works together with software for searching, accessing, and using the data and accompanying information.

Now containing data for 34 constant properties and 15 temperature-dependent properties, the DIPPR 801 database continues to expand. Data for 2130 industrially important compounds are included in the public version of the database with values of all 49 properties for each chemical. Although some component information may not yet be known, DIPPR 801 maintains a standard of completeness by including estimated values based on thorough review when experimental data are not available. Using fundamental SI units, the DIPPR 801 database also includes temperature-dependent correlation coefficients, applicable upper and lower temperature limits, and values computed at these limits for temperature-dependent properties.

As the project progresses, DIPPR 801 is upgraded and expanded regularly to support user experiences and sponsor needs. Additional industrially important chemical compounds and properties are included in each successive project year in response to sponsor requests. Previously compiled thermophysical data is also improved by critical evaluation, and new experimental values are added when appropriate. In the future, further experimental thermophysical data from other DIPPR projects will also be systematically added to the DIPPR 801 database when such results are released to the public. These results will include both pure compound and mixture data.

Recently launched in 2002, a small experimental subproject was added to DIPPR 801 which continues in 2004. Beginning, due to the scarcity of literature data for many compounds in recent years, the Steering Team received approval for an additional small experimental budget within Project 801 to allow the contractor to measure selected properties, as needed for current sponsor-nominated compounds. Candidate properties include: normal boiling point or vapor pressure, liquid density, transport properties, and critical properties, with emphasis on simple/inexpensive measurements. Selections of measurements in the subproject are at the discretion of the contractor, with oversight by the 801 Steering Team. Although the experimental component enhances the quality of the database, project leaders emphasize that the primary direction of Project 801 has not changed.

New pure compound thermophysical data and property estimation methods from other sources, such as published literature, theses, government reports, and vendor technical bulletins, are also systematically evaluated and incorporated as appropriate. Applying critical evaluation to improve quality codes and recommended values and expanding applicable temperature ranges, by estimation if necessary, DIPPR 801 personnel will continue to satisfy process engineering needs.

Jointly selecting correlation methods, organization, format, and software for DIPPR 801, the Steering Team and the Project Investigators will continue to expand the content and improve the quality of data accessible through the database. Summary progress reports of DIPPR 801 are distributed to all DIPPR participants twice a year, and detailed technical reports are given to the project sponsors to keep all parties updated. Reviewed annually by the DIPPR Technical Committee, which decides on contract renewal, modifications, or termination. DIPPR 801 is a database and chemical engineering resource that will continue to produce evaluated, complete thermophysical data for greater accuracy and success.

 BYU-Thermophysical Properties Laboratory

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