Ion processing device, ion chromatograph provided with the ion processing device, and eluent generator provided with the ion processing device

Patent metadata

Field	Value
Publication number	US-2016175778-A1
Application number	US-201514962106-A
Country	US
Kind code	A1
Filing date	Dec 8, 2015
Priority date	Dec 19, 2014
Publication date	Jun 23, 2016
Grant date	—

Abstract

An ion processing device includes, on the side of an anion exchange layer of a bipolar membrane which is formed by stacking an anion exchange layer and a cation exchange layer, an anion-side channel which is filled with an anion exchanger, and an anion removal channel provided via an anion exchange membrane, and also includes an anode for moving anions from the anion-side channel to the anion removal channel through the anion exchange membrane. Further, a cation-side channel which is filled with a cation exchanger and a cation removal channel provided via a cation exchange membrane are included on the side of the cation exchange layer of the bipolar membrane as well as a cathode for moving cations from the cation-side channel to the cation removal channel through the cation exchange membrane.

First claim

What is claimed is:

1 . An ion processing device comprising:
a bipolar membrane that is formed by stacking an anion exchange layer and a cation exchange layer; an anion-side channel that is arranged in contact with the anion exchange layer of the bipolar membrane, and that is filled with an anion exchanger; an anion removal channel that is arranged in contact with the anion-side channel via an anion exchange membrane; an anode for moving anions from the anion-side channel to the anion removal channel through the anion exchange membrane; a cation-side channel that is arranged in contact with the cation exchange layer of the bipolar membrane, and that is filled with a cation exchanger; a cation removal channel that is arranged in contact with the cation-side channel via a cation exchange membrane; and a cathode for moving cations from the cation-side channel to the cation removal channel through the cation exchange membrane.

2 . The ion processing device according to claim 1 , further comprising a channel branching section for dividing and introducing a liquid from one channel into the anion-side channel and the cation-side channel.

3 . An ion chromatograph comprising:
a separation column for separating a sample; an eluent delivery section for delivering an eluent to the separation column; a sample injection section for injecting a sample into a flow of the eluent that is delivered by the eluent delivery section to the separation column; a suppressor that is connected to an eluent outlet side of the separation column, the suppressor being an ion processing device including a bipolar membrane that is formed by stacking an anion exchange layer and a cation exchange layer, an anion-side channel that is arranged in contact with the anion exchange layer of the bipolar membrane, and that is filled with an anion exchanger, an anion removal channel that is arranged in contact with the anion-side channel via an anion exchange membrane, an anode for moving anions from the anion-side channel to the anion removal channel through the anion exchange membrane, a cation-side channel that is arranged in contact with the cation exchange layer of the bipolar membrane, and that is filled with a cation exchanger, a cation removal channel that is arranged in contact with the cation-side channel via a cation exchange membrane, a cathode for moving cations from the cation-side channel to the cation removal channel through the cation exchange membrane, and a channel branching section for dividing and introducing the eluent flowing out of the separation column into the anion-side channel and the cation-side channel; a first conductivity detector that is, with respect to the suppressor, connected to the anion-side channel on an opposite side from the channel branching section; and a second conductivity detector that is, with respect to the ion processing device, connected to the cation-side channel on the opposite side from the channel branching section.

4 . The ion chromatograph according to claim 3 , further comprising a data processing section that is connected to the first conductivity detector and the second conductivity detector,
wherein the data processing section is configured to simultaneously detect anions or cations by both a non-suppressor method and a suppressor method based on detection signals of both the first conductivity detector and the second conductivity detector.

5 . An eluent generator comprising:
an ion processing device including a bipolar membrane that is formed by stacking an anion exchange layer and a cation exchange layer, an anion-side channel that is arranged in contact with the anion exchange layer of the bipolar membrane, and that is filled with an anion exchanger, an anion removal channel that is arranged in contact with the anion-side channel via an anion exchange membrane, an anode for moving anions from the anion-side channel to the anion removal channel through the anion exchange membrane, a cation-side channel that is arranged in contact with the cation exchange layer of the bipolar membrane, and that is filled with a cation exchanger, a cation removal channel that is arranged in contact with the cation-side channel via a cation exchange membrane, and a cathode for moving cations from the cation-side channel to the cation removal channel through the cation exchange membrane; a solution supply section, on one side of the ion processing device, for supplying pure water and an electrolyte solution containing cations to the anion-side channel and the cation-side channel, respectively, or for supplying an electrolyte solution containing anions and pure water to the anion-side channel and the cation-side channel, respectively; and a merging section, on another side of the ion processing device, for merging liquids flowing out of the anion-side channel and the cation-side channel.

Assignees

• Shimadzu Corp

Inventors

• Oikawa Yukio

Classifications

• B01D61/485

  Specific features relating to the ion-exchange material · CPC title

• B01D15/361

  Ion-exchange · CPC title

• B01D15/24

  relating to the treatment of the fractions to be distributed · CPC title

• B01D15/424

  Elution mode · CPC title

• B01D61/445 Primary

  with bipolar membranes; Water splitting · CPC title