Microporous membrane gas and liquid separator

Abstract

The invention provides a microporous membrane gas-liquid separator, which comprises an upper plate body (7), a lower plate body (1) and a plane hydrophobic microporous breathable membrane (2) between the upper and lower plate bodies. The microporous membrane gas-liquid separator is characterized in that the contact surfaces between the upper and lower plate bodies and the plane hydrophobic microporous breathable membrane (2) are planes engraved with symmetric curved grooves (4); and a groove of the upper plate body (7) is a gas carrying passage, and a groove of the lower plate body (1) is a mixed gas-liquid passage. As the microporous membrane gas liquid separator takes the curved grooves as gas liquid separation passages, the microporous membrane gas-liquid separator has small dead volume and long gas liquid separation passages, thereby not only obtaining high gas transmissibility but also preventing the peak broadening of a target compound in a subsequent instrument test result, and finally obtaining high analytic determination sensitivity.

Description

technical field [0001] The invention belongs to the field of chemical analysis and testing instruments, and relates to a microporous membrane gas-liquid separator, which is mainly used as an interface for on-line coupling of liquid chromatography and gas chromatography detectors, atomic spectrum or mass spectrometry. Background technique [0002] Metals such as mercury, arsenic, lead, cerium, chromium, and tin exist in the environment and in organisms in the form of different inorganic or organometallic compounds. Since different forms of the same metal have different environmental chemical behaviors and toxicity, it is of great significance to determine the form of the metal (speciation analysis). Chromatography is combined with atomic absorption spectrometer (AAS for short), atomic fluorescence spectrometer (AFS for short), atomic emission spectrometer (AES for short), inductively coupled plasma mass spectrometry (ICP-MS for short) or gas chromatography flame photometric d...

AI Technical Summary

Problems solved by technology

Existing planar membrane gas-liquid separation devices generally use a polytetrafluoroethylene membrane to divide a cavity with a volume of several mL into two chambers, one of which is connected to the gas-liquid mixture flow path, and the other chamber is connected to the carrier gas flow path. , due to the large dead volume of this gas-liquid separator, it will broaden the peak of the target compound in the gas chromatography detection results; while the effective separation contact area of ​​the hollow fiber membrane (breather tube) gas-liquid separator is small, the target compound The permeability of derivative product gas is low

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