Supercritical fluid processing device

Patent metadata

Field	Value
Publication number	US-9766214-B2
Application number	US-201214647333-A
Country	US
Kind code	B2
Filing date	Nov 28, 2012
Priority date	Nov 28, 2012
Publication date	Sep 19, 2017
Grant date	Sep 19, 2017

Abstract

A supercritical fluid chromatograph includes a supercritical flow path, a mobile phase supply section for supplying a mobile phase containing liquid carbon dioxide, a sample introduction section, a sample separation section, a detector, and a pressure control valve. A valve post-stage flow path is connected to a fluid outlet of the pressure control valve, and the inside of the valve post-stage flow path is maintained by pressure maintaining means at a pressure by which a mobile phase from the fluid outlet of the pressure control valve is not vaporized.

First claim

What is claimed is:

1. A supercritical fluid processing device comprising:
a supercritical flow path through which a sample flows together with a mobile phase in a supercritical state;
a sample separation section arranged on the supercritical flow path, for performing separation of the sample;
a detector arranged on the supercritical flow path, on a downstream side of the sample separation section, the detector being for detecting a sample component separated by the sample separation section;
a pressure control valve connected to the supercritical flow path on a downstream side of the detector, the pressure control valve having a fluid inlet and a fluid outlet, and being for controlling a pressure inside the supercritical flow path to a predetermined pressure and for converting a mobile phase into a supercritical state;
a valve post-stage flow path having one end connected to the fluid outlet of the pressure control valve; and
pressure maintaining means provided to the pressure control valve, on a side of the fluid outlet, the pressure maintaining means being for maintaining an inside of the valve post-stage flow path at a pressure by which a mobile phase from the fluid outlet does not vaporize;
wherein no heaters are provided between the fluid outlet of the pressure control valve and the pressure maintaining means.

2. The supercritical fluid processing device according to claim 1 , wherein the pressure maintaining means is an orifice provided to the valve post-stage flow path.

3. The supercritical fluid processing device according to claim 1 , wherein the pressure maintaining means is a resistance tube provided as a part of the valve post-stage flow path.

4. The supercritical fluid processing device according to claim 1 , wherein the pressure maintaining means is a second pressure control valve for adjusting a pressure inside the valve post-stage flow path.

5. The supercritical fluid processing device according claim 1 , further comprising heating means for heating the pressure maintaining means.

6. The supercritical fluid processing device according to claim 2 , wherein the orifice is provided at a downstream end of the valve post-stage flow path, and the downstream end of the valve post-stage flow path is exposed to air.

7. The supercritical fluid processing device according to- claim 1 , further comprising cooling means for converting a mobile phase flowing to the fluid inlet into a liquid state by cooling a flow path connected to the fluid inlet of the pressure control valve.

Assignees

• Shimadzu Corp

Inventors

• Goto Hiroomi
• Inoue Tsunehiro
• Mori Takahiro
• Abe Hirohisa

Classifications

• G05D16/202

  actuated by an electric motor · CPC title

• F16K31/004

  actuated by piezoelectric means · CPC title

• G05D7/0641

  using a plurality of throttling means (G05D7/067 takes precedence) · CPC title

• G01N30/36 Primary

  in high pressure liquid systems · CPC title

• B01D15/40

  using supercritical fluid as mobile phase or eluent · CPC title