Chromatograph for pressure chromatography

US4361482A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Volker Teetz · Hofheim, DE
• Rainer Uhmann · Kriftel, DE
• Rudolf Knapp · Eppstein, DE

Key dates

• Filing date: Oct 7, 1981
• Grant date: Nov 30, 1982
• Expiry date: Oct 7, 2001

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N30/36
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

In this chromatograph for pressure chromatography, a plunger having a plunger stem is arranged so that it can move within the separation column (3). On the front face of the plunger there is a collecting space (7) for liquid, which is covered by a frit (6) and which has a connecting line (8) to the face of the plunger opposed to the front face. In order to prevent abrasive and chemical attack by the column packing on the plunger, its seal and the cylinder wall of the separation column, the plunger should comprise a lower part (2) having a device (4) to accommodate the plunger stem (5), and an upper part (1), the two parts being arranged so that they can move in relation to one another. The upper part (1) has a centering peg (9) which projects into the lower part (2). A spring (12) on which the upper part (1) is supported, is located concentrically in relation to the peg (9). The upper part (1) has recesses on its circumference to accommodate at least two seals (19 and 21) and a ring channel (16) which is formed by a retaining ring (13) for one seal (19) and is connected to the collecting space (7). The other seal (21) is held in its recess by a ring (23) which is located concentric…