Liquid purification or separation – Processes – Chemical treatment
Reexamination Certificate
2008-10-16
2009-08-11
Anthony, Joseph D (Department: 1796)
Liquid purification or separation
Processes
Chemical treatment
C210S763000, C252S186330, C252S186210, C252S186320, C252S186270, C252S186340, C252S186350, C252S186360, C252S187100, C252S187230, C252S187240, C252S187270, C252S187280
Reexamination Certificate
active
07572384
ABSTRACT:
A method and composition for reducing chemical oxygen demand is presented. The composition includes a persulfate donor and a transition metal catalyst in contact with the persulfate donor. When the composition is contacted by water, the transition metal catalyst reacts with persulfate and reduces the persulfate concentration in the water. The composition allows the use of persulfate, which is known to cause irritation to users of aquatic facilities (e.g., pools, spas) that come in contact with it. As the persulfate concentration is reduced rapidly in the water by the catalyzed reaction, the persulfate-containing cleaning product may even be used while the aquatic facilities are being used. Optionally, a free halogen donor may be incorporated into the composition. The composition may be in the form of powder, granules (coated or uncoated), or agglomerate.
REFERENCES:
patent: 3532634 (1970-10-01), Woods
patent: 3577490 (1971-05-01), Welsh et al.
patent: 4492618 (1985-01-01), Eder
patent: 4555457 (1985-11-01), Dhanji
patent: 5114611 (1992-05-01), Van Kralingen et al.
patent: 5139762 (1992-08-01), Flagella
patent: 5525121 (1996-06-01), Heffner et al.
patent: 5599781 (1997-02-01), Haeggberg et al.
patent: 5607656 (1997-03-01), Soicke et al.
patent: 6004510 (1999-12-01), Gilbert et al.
patent: 6139769 (2000-10-01), Nestler
patent: 6221826 (2001-04-01), Surutzidis et al.
patent: 6409926 (2002-06-01), Martin
patent: 6455751 (2002-09-01), Hoffman et al.
patent: 6566318 (2003-05-01), Perkins et al.
patent: 6863830 (2005-03-01), Purdy et al.
patent: 7090820 (2006-08-01), Martin
patent: 7255797 (2007-08-01), Martin
patent: 7465410 (2008-12-01), Martin et al.
patent: 2005/0035066 (2005-02-01), Martin et al.
patent: 2005/0155936 (2005-07-01), Martin et al.
patent: 2005/0167635 (2005-08-01), Martin et al.
patent: 2005/0261138 (2005-11-01), Robb et al.
patent: 2006/0013750 (2006-01-01), Martin et al.
patent: 2006/0013751 (2006-01-01), Martin et al.
patent: 2006/0078584 (2006-04-01), Lightcap et al.
patent: 2006/0205626 (2006-09-01), Gant et al.
patent: 2006/0293178 (2006-12-01), Martin
patent: 2006/0293179 (2006-12-01), Martin
patent: 2007/0193958 (2007-08-01), Martin
Anthony Joseph D
Truox, Inc.
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