# US 8,784,655 B2 · Ion chromatography system using catalytic gas elimination

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- Number: US 8,784,655 B2
- Document ID: US8784655B2
- Status: Granted
- Kind: B2
- Application number: 13/240,610
- Filed: 2011-09-22
- Published: 2012-02-02
- Granted: 2014-07-22
- Earliest claimed: 2005-02-23
- Assignees: Dionex Corporation
- Applicants: Yan Liu; Christopher A. Pohl; Nebojsa Avdalovic; John M. Riviello; Archava Siriraks
- Inventors: Yan Liu; Christopher A. Pohl; Nebojsa Avdalovic; John M. Riviello; Archava Siriraks
- Web page: https://patentgrep.com/patent/US8784655B2

## CPC

- G01N 30/96: using ion-exchange (G01N30/02, G01N30/90 take precedence)
- G01N 30/62: Detectors specially adapted therefor
- G01N 2030/965: {suppressor columns}
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)

## Abstract

A liquid chromatographic system is provided including catalytically combining hydrogen and oxygen gases in the chromatography eluent stream in a catalytic gas elimination chamber, to form water and thereby reduce the gas content in the eluent stream. Also, a liquid ion chromatographic system in which the effluent from the detector is recycled to a membrane suppressor and then is mixed with a source of eluent for recycle to the chromatographic column.

## Claims

### Claim 1

A chromatography apparatus comprising:
(a) chromatographic separation medium,
(b) a detector,
(c) a conduit for an aqueous liquid eluent stream providing fluid communication between said chromatographic separation medium and with said detector, and
(d) a catalytic gas elimination chamber in fluid communication with said conduit and including a catalyst for combining hydrogen and oxygen gases, or for catalytically decomposing hydrogen peroxide, or both, in said eluent stream to form water and reduce the gas content in said eluent stream.

### Claim 2 (depends on 1)

The apparatus of claim 1 further comprising:
(e) a recycle line for directing effluent from said detector to chromographic separation medium.