# US 8,146,752 B2 · Water purification system and method

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- Number: US 8,146,752 B2
- Document ID: US8146752B2
- Status: Granted
- Kind: B2
- Application number: 12/587,742
- Filed: 2009-10-13
- Published: 2010-02-04
- Granted: 2012-04-03
- Earliest claimed: 2006-01-27
- Assignees: EMD Millipore Corporation
- Inventors: Yves Gaignet; Ichiro Kano; Cecilia Regnault; Daniel Darbouret
- Web page: https://patentgrep.com/patent/US8146752B2

## CPC

- C02F 9/20: Portable or detachable small-scale multistage treatment devices, e.g. point of use or laboratory water purification systems
- C02F 1/288: {using composite sorbents, e.g. coated, impregnated, multi-layered}
- C02F 1/283: {using coal, charred products, or inorganic mixtures containing them}
- C02F 1/444: {by ultrafiltration or microfiltration}
- C02F 2103/04: for obtaining ultra-pure water
- C02F 2201/006: Cartridges
- C02F 2301/046: Recirculation with an external loop
- Y10T 137/0318: Processes
- Y10T 137/8593: Systems
- Y10T 137/85938: Non-valved flow dividers
- Y10T 137/85954: Closed circulating system
- C02F: TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE (separation in general B01D; special arrangements on waterborne vessels of installations for treating water, waste water or sewage, e.g. for producing fresh water, B63J; adding materials to water to prevent corrosion C23F; treating radioactively-contaminated liquids G21F9/04; regeneration of reactants for recirculation into processes, see the relevant places for the processes)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A polishing cartridge in a water purification system for final purification of water for distribution to a point of use. The system includes a closed water recirculation loop supplied at one point by a water inlet with water to be purified, and having at least one outlet point of use of the purified water, a pump and a water purifier on the loop respectively downstream of the inlet point and upstream of the at least one outlet point, in the water flow direction, and two independent valves on the loop. The system further including a hydraulic connector including four ports that forms a distributor or manifold for the system. The cartridge contains a combination of an ultra filter having a cut-off below 13000 daltons for reducing the level of pyrogens and nucleases contained in the water, and C18 grafted media effective for reducing the level of contaminants in the water.

## Claims

### Claim 1

A polishing cartridge in a water purification system for final purification of water for distribution to a point of use, said water purification system comprising :
a closed water recirculation loop supplied at one point by a water inlet with water to be purified, and having at least one outlet point of use of the purified water, a pump and water purification means on the loop respectively downstream of the inlet point and upstream of the at least one outlet point, in the water flow direction, said system including two independent valves on the loop: a first two-way normally closed valve on the loop, for recirculation, to provide in the open position, recirculation of water purified by the purification means, via the pumping means, and a second two-way normally closed valve for distribution of said at least one outlet point of use and being disposed upstream of said first valve and of the at least one point of use outlet point so as to provide, in the closed position, recirculation of all of the water purified by the purification means towards said first valve; said system further comprising a first hydraulic connector comprising four ports that forms a distributor or manifold for said system and is positioned between said first two-way normally closed valve and said second two-way normally closed valve; and
said cartridge containing a combination of an ultra filter having a cut-off below 13000 daltons for reducing the level of pyrogens and nucleases contained in said water and C18 grafted media effective for reducing the level of contaminants in said water.

### Claim 2 (depends on 1)

The polishing cartridge of claim 1, wherein said contaminants comprise organics that disturb the base-lines in liquid chromatography.

### Claim 3 (depends on 1)

The polishing cartridge of claim 1, wherein said contaminants include one or more of boron, silica and heavy metals.

### Claim 4 (depends on 1)

The polishing cartridge of claim 1, wherein said polishing cartridge has an inlet connected to said water purification system, and an outlet in fluid communication with said point of use.