Apparatus and method for controlling boiling conditions of hot phosphoric acid solution with pressure adjustment
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United States of America Patent
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-
Jul 6, 2004
Grant Date -
Jan 24, 2002
app pub date -
Feb 28, 2001
filing date -
Jun 8, 2000
priority date (Note) -
In Force
status (Latency Note)
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Abstract
Disclosed is an apparatus and method for controlling boiling condition of hot H.sub.3 PO.sub.4 solution by adjusting the vapor extracting rate thereof, wherein an acid tank filled with hot H.sub.3 PO.sub.4 solution to a level surface is located in a treatment room and a temperature thermocouple is arranged above the level surface of the hot H.sub.3 PO.sub.4 solution to monitor the vapor temperature near the level surface of the H.sub.3 PO.sub.4 solution. The vapor temperature is used to adjust the extracting rate of the treatment room by control of a damper connected to an outlet of the treatment room. According to the present invention, the treatment apparatus and method can control the boiling condition of the hot H.sub.3 PO.sub.4 solution thereof by properly adjusting the extracting rate, and therefore avoid defects and loss of control in manufacturing processes.
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