Process for the concentration of dilute sulphuric acid solutions
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United States of America Patent
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-
Apr 15, 2003
Grant Date -
N/A
app pub date -
Jan 29, 2001
filing date -
Jul 30, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process is provided for increasing the concentration of sulfuric acid in a waste solution of sulfuric acid previously used to produce titanium dioxide. The waste solution of sulfuric acid is fed into a first heat exchanger/evaporator stage that operates at a sulfuric acid concentration of less than 30%. A portion of the solution discharged from the first heat exchanger/evaporator is fed into a heat exchanger/evaporator that uses waste heat and operates at a sulfuric acid concentration that is greater than 40%, while the remainder of the solution discharged from the first heat exchanger/evaporator and the solution discharged from the heat exchanger/evaporator using waste heat is fed into a second heat exchanger/evaporator that operates at a sulfuric acid concentration that is greater than 50%.
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