Calculate sublimation rate from pressure rise

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SUMMARY

The discussion focuses on calculating the sublimation rate during freeze drying by analyzing pressure rise data from a chamber. A pressure rise test was conducted by closing an isolation valve and measuring the pressure increase over 30 seconds. Participants suggest that combining engineering and chemistry equations is necessary to accurately determine the sublimation rate from the pressure data. However, definitive methods or formulas for this calculation were not established in the conversation.

PREREQUISITES
  • Understanding of pressure rise tests in vacuum systems
  • Familiarity with sublimation processes in freeze drying
  • Knowledge of relevant engineering equations
  • Basic chemistry principles related to vapor pressure
NEXT STEPS
  • Research the relationship between pressure changes and sublimation rates in freeze drying
  • Study the Clausius-Clapeyron equation for phase changes
  • Explore engineering equations applicable to vacuum systems
  • Investigate methods for measuring vapor pressure accurately
USEFUL FOR

Researchers in freeze drying technology, chemical engineers, and professionals involved in vacuum system design and analysis will benefit from this discussion.

flysa01
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Hi, I did a pressure rise test on a chamber, where I closed the isolation valve and measured the increase in pressure over 30 seconds.

I want to use this information to calculate the rate of accumulation of vapour in the chamber. What I'm looking for is the sublimation rate during freeze drying, so how does this increase in pressure correlate to a sublimation rate?

Any suggestions are much appreciated!
 
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Before giving my suggestion I would like to know if you have solved this as I am very late to replay here? If know then I would love to answer you.

powder coat
 
Hiya, I never got it worked out right, do you know how to do it?? In the end I combined a few engineering equations with some chemistry ones and hoped for the best but I knew it wasn't right!
 

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