Purification of alkali metal hydroxides
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United States of America Patent
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Feb 8, 1983
Grant Date -
N/A
app pub date -
May 27, 1980
filing date -
May 27, 1980
priority date (Note) -
Expired
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Abstract
A method to purify an aqueous solution of an alkali metal hydroxide by countercurrently contacting the ammonia and hydroxide, in a volume ratio of about 0.6 to 1 to about 1 to 1, in a packed bed. The temperature in the lower portion of an extractor in which the process is carried out is controlled and maintained within a range of at least about 155.degree. to about 170.degree. F.
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