Trisodium citrate → Copper

HRID 2239199Notes

Reaction equation

HRID 2239199 reaction equation
S([O-])([O-])(=O)=O.[Cu+2:6].C([O-])(=O)CC(CC([O-])=O)(C([O-])=O)O.[Na+].[Na+].[Na+].[NH:23]1[C:27]2[CH:28]=[CH:29][CH:30]=[CH:31][C:26]=2[N:25]=[N:24]1>O>[Cu:6].[NH:23]1[C:27]2[CH:28]=[CH:29][CH:30]=[CH:31][C:26]=2[N:25]=[N:24]1

Participants

6

Reactant 3

HCID 6224Trisodium citrateHCID 24462Copper SulfateHCID 178418385HCID 178418385, compound

Product 2

HCID 23978CopperHCID 178418385HCID 178418385, compound

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Procedure

A 2:1 molar ratio of copper sulfate and trisodium citrate, respectively, and benzotriazole (BZT) were mixed in DI water to yield a 50 ppm copper and 25 ppm BZT CMP synthetic filtrate with a pH of 3.70. To aliquots of this solution mixing at 100 rpm, a polymeric chelant in the absence of a coagulant or a coagulant in the absence of a polymeric chelant was charged then allowed to mix for 15 minutes. Treated aliquots were filtered using a 0.45 micron filter. The isolated filtrate was then analyzed for pH and copper content via ICP, the results of which are summarized in Table 1. Test results demonstrated that non-dithiocarbamate polymeric chelant and coagulant as separate treatments are not as effective in precipitating copper from the test matrix.

Sources & evidence

ORD record
ord-992ad8e4ef414e4fb25bf5edd97d6340
Source dataset
uspto-grants-2010_05
Patent number
US07722841B2

Reaction notes

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