Evaluated Standard Thermophysical Property Values
DIPPR® 801
Design Institute for Physical Properties
Sponsored by AIChE
DIPPR® 801’s 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 1973 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.
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