Fluorescent compounds for use in industrial water systems
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United States of America Patent
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Mar 19, 2002
Grant Date -
N/A
app pub date -
Nov 8, 1999
filing date -
Nov 8, 1999
priority date (Note) -
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Abstract
Fluorescent compounds of the formula: ##STR1## wherein R.sub.1 and R.sub.2 are either both SO.sub.3 M, or one of R.sub.1 and R.sub.2 is SO.sub.3 M and the other is COOM, where M is selected from the group consisting of H, Na, K, Rb, Cs, Li or ammonium, are described and claimed. These inert flurorescent compounds have been found to be resistant to oxidizing biocides. One process for making these compounds is described and claimed as the condensation between a 1,8-naphthalic anhydride possessing the desired functionalities and the appropriately substituted o-phenylene diamine. Alternatively, o-amino-nitro-aromatics may be condensed with the various 1,8-naphthalic anhydrides when the in situ reduction of the nitro group is accomplished with a suitable reducing agent such as iron powder. The resulting fluorescent compounds can be used as inert fluorescent tracers in industrial water systems.
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