Method and apparatus for preparing high-concentration alkali
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United States of America Patent
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May 16, 1989
Grant Date -
N/A
app pub date -
May 27, 1986
filing date -
Apr 18, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A caustic alkali solution is concentrated to high density or high caustic alkali concentration by evaporation under high pressure at elevated temperature and expansion of the thus obtained concentrated caustic alkali solution to low pressure, preferably below atmospheric pressure. The pressure difference between the high pressure evaporator and the low pressure expansion vessel is absorbed gradually by a pressure difference absorber, preferably comprising a liquid column in a U-shaped siphon tube, so that corrosion and erosion are reduced considerably.
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