Process for treating a liquid
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United States of America Patent
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Oct 12, 1999
Issued Date -
N/A
app pub date -
Mar 4, 1997
filing date -
Sep 12, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process for treating a liquid comprising subjecting a liquid containing, in solution, citric acid as well as a less desirable component having a similar molecular weight to citric acid, to nanofiltration in a filtration step. From the filtration step, a permeate in which the ratio of the concentration of the citric acid to that of the less desirable component is greater than the ratio of the concentration of the citric acid to that of the less desirable component in the solution, is obtained.
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