Drying and gas or vapor contact with solids – Process – Gas or vapor pressure varies during treatment
Patent
1998-08-24
2000-10-24
Wilson, Pamela
Drying and gas or vapor contact with solids
Process
Gas or vapor pressure varies during treatment
34405, 62 89, F26B 504
Patent
active
061348058
ABSTRACT:
A method [and an apparatus are] is disclosed for detecting an occurrence of a liquid dry condition in a container containing a liquefied compressed gas while the gaseous phase of the liquefied compressed gas is being removed from the container over time. The [apparatus includes] method uses a first sensor, a second sensor, and a computer, preferably a programmed logic controller (PLC). The first sensor senses temperature (T) inside the container and provides a signal indicative thereof. The second sensor senses pressure (P) inside the container and provides a signal indicative thereof. The computer receives signals from the first and second sensors, and determines the rates of change in the pressure (dP/dt) and the temperature (dT/dt) inside the container over time. The computer identifies an occurrence of a sudden increase in the rate of change in the temperature (dT/dt) inside the container and a substantial simultaneous occurrence of a sudden decrease in the rate of change in the pressure (dP/dt) inside the container, [said] substantially simultaneous occurrences indicating an occurrence of a liquid dry condition in the container. [The preferred embodiment includes a third sensor for sensing ambient temperature (T.sub.a) and for providing a signal indicative thereof. The computer receives a signal from the third sensor and accounts for a change in the ambient temperature in determining the rate of change in the temperature (dT/dt) inside the container over time.]
REFERENCES:
patent: 5359787 (1994-11-01), Mostowy, Jr. et al.
patent: 5502970 (1996-04-01), Rajendran
patent: 5539998 (1996-07-01), Mostowy et al.
Chandra Sukla
Chowdhury Naser Mahmud
Janigian Warren Matthew
Air Products and Chemicals Inc.
Chase Geoffrey L.
Mattera Michelle A
Wilson Pamela
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