Chemistry: electrical and wave energy – Processes and products
Patent
1986-10-06
1989-05-09
Niebling, John F.
Chemistry: electrical and wave energy
Processes and products
204104, 204130, 204 63, 204 65, 204 66, 134 12, 134109, 2021856, 202158, 202176, 202186, 202234, 202235, 202198, 203 96, 203 49, 203 99, 423531, C25B 128, B01D 314
Patent
active
048286605
ABSTRACT:
A continuous process and apparatus for the repurification of ultrapure liquids. An oxidant solution comprising ultrapure sulfuric acid, peroxydisulfuric acid, and ultrapure water is continuously withdrawn from a process after use. The withdrawn oxidant is reprocessed continuously by contacting with alumina to remove fluoride ions. Water is continuously separated or stripped from the oxidant solution by heating the solution and bubbling an inert gas therethrough causing the water to vaporize from the solution. The separated oxidant is continuously distilled and condensed to form a purified stream of sulfuric acid. The major portion of this stream is continuously returned to the process. The remaining minor portion is continuously cooled, subjected to analysis for purity, and diluted with ultrapure water. The diluted sulfuric acid is further cooled prior to electrochemical treatment in the anode compartment of an electrochemical cell. This converts at least a portion of the dilute sulfuric acid to peroxydisulfuric acid. The resulting solution is continuously returned to the process to be mixed with the major portion of the purified sulfuric acid. A system of apparatus to conduct the processes is provided which also includes means for continuously analyzing the minor portion for purity and trace elements.
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Clark R. Scot
Davison John B.
Hoffman Joe G.
Jones Alan W.
Jones, Jr. Allen H.
Athens Corporation
Bethel George F.
Bethel Patience K.
Gorgos Kathryn
Niebling John F.
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