Educational Resources
for Particle Technology

Since 1998 ERPT has provided on-line, just-in-time, world-wide, free-of-charge tutorials
in particle technology as a public service of the Particle Technology Forum of the AIChE.

Now, in 2011, this site will be retired because over the past decade the resources that ERPT has provided have been surpassed by many new websites and applications such as

  • search engines (Google, Chrome, GoogleBooks, GoogleScholar, JSTOR, etc.)
  • communal knowledge bases (Wikipedia, YouTube, etc)
  • professional networks (Linked-in, AIChE network, ACS network, etc)
  • professional organization resource bases (AIChE ChemE on Demand, Knovel, AccessEngineering, etc.)

The contents of the ERPT site will be deleted after November 30, 2011, and all that will be remain posted will be a retirement notice so that people who visit the site will be informed of what has happened to the site. Thank you for your interest and use of this pioneering website.

cross-linked encyclopedic articles


technical publications and abstracts

The Significance of PT
Formation from Gas
Formation from Liquid
Comminution, Attrition
Size Enlargement
Particle Physics
Particle Characterization:
   Non-Optical Methods
   Optical Methods
Storage / Discharge:
   Mechanics: wall stress
   Dynamics: flow
Pneumatic Conveying
Fluidized Bed
Separation by Size
P./Gas Separation
P./Liquid Separation
Dispersion in Fluids
Heating, Drying
Simulation, Modeling
Specific Applications
Outline of PT
Books on PT
Other Ed Resources:
      technical reviews
      CDROM, video
      Web courses
      short courses
      teaching methods
Contents of ERPT
      Vol. 1 (1999)
      Vol. 2(1) (2001)
      Vol. 2(2) (2001)
      Vol. 3 (2002)
      Vol. 4 (2003)
      Vol. 5 (2005)

ERPT Authors' Guide
How ERPT Evolved


ERPT provides
-- tutorials at the undergraduate and graduate level
-- ideas and examples for enriching classes and laboratories
-- typical solutions for common industrial problems

Professional oversight of the ERPT site is provided by the Particle Technology Forum, a technical division of the American Institute of Chemical Engineers.
Web site design, editing, and maintainance is provided by the Managing Editor of ERPT, Ralph D. Nelson, Jr., Ph.D., P.E., Fellow of the AIChE

Origin / History

ERPT was launched in 1998 as a public education service of the Particle Technology Forum. This Web site provides on-line, just-in-time, world-wide, free-of-charge tutorials in particle technology as a public service. The original goal was to build a site that would eventually provide several hundred tutorials, each equivalent to one to three hours of classroom instruction at the third-year college level. These would be introductory in nature and in the ideal case would describe the main phenomenological and theoretical aspects of the topic, noting industrial applications, large-scale equipment, typical industrial problems, and typical solutions to those problems.

Over the past ten years usage has grown to over ten thousand visits per month. See History of ERPT

Explanations and Disclaimers
Questions? Email the Managing Editor at