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Volatility amine sensor

A volatility sensor technology, applied in the field of volatile amine gas sensors, can solve the problems of unsuitable sensors and continuous online monitoring of amine concentration, and achieve the effect of avoiding adsorption and simple structure

Active Publication Date: 2010-07-07
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reported SID must be coupled with gas chromatography, and requires carrier gas and makeup gas, and cannot continuously monitor the concentration of amines in the air on-line, so it is not suitable for use as a sensor

Method used

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Examples

Experimental program
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Embodiment Construction

[0032] A volatile amine sensor, including components such as an emitter, a heating rod, a collector, a diffusion membrane, and a housing,

[0033] The cylindrical emitter is sleeved on the outer wall of the heating rod, and the collector is cylindrical, placed coaxially with the heating rod, and the distance between the emitter and the emitter is 1mm; the emitter, heating rod and collector are all located in the center of the shell; the diffusion The membrane is a flat gas diffusion membrane fixed on the shell;

[0034] The material of the emitter is metal molybdenum with a large work function, and the emitter is heated to the working temperature with a heating rod, and the polarization voltage of +30-400V is directly applied to the emitter, and no additional polarization is required;

[0035] The heating rod heats the emitter metal electrode and supports the emitter. The outer layer is made of quartz glass, which is high temperature resistant, insulated and chemically inert t...

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Abstract

The invention relates to a selectivity sensor for measuring volatility amine, hydrazine and derivatives thereof by adopting a surface thermal ionization theory, and comprises the assembly such as an emitting electrode, and a collector and the like in a shell, wherein the emitting electrode is prepared from molybdenum or platinum or alloy materials and is a filament-winding or cylindrical structure; a heating rod heats a metal electrode of the emitting electrode and supports the emitting electrode; or the emitting electrode and the collector are two plates arranged in parallel. When the emitting electrode is heated to 350-480DEG C in the air, the air, amine or hydrazine or other compositions diffuse in the sensor, are collided with the surface of the emitting electrode, and only if the surface ionization of the amine and the hydrazine generates a positive ion, the measurement is carried out. The minimum measured amount of the sensor to the tertiary amine is less than 2 mu g / m<3>, and the invention can be used for on-site measurement of a compound of the volatility amine and toxic amine.

Description

technical field [0001] The invention relates to a surface ionization sensor (SIS) volatile amine gas sensor based on the principle of surface thermal ionization. The sensor can detect toxic amines, hydrazines and their derivatives, etc., and detect the concentration of amines and hydrazines in the air on site. Background technique [0002] Amines and heterocyclic amines are widely used in chemical industry, chemical pharmaceutical and other industries. Wastewater and waste gas discharged from industries such as industry, agriculture, pharmaceuticals and food processing all contain amines. Low concentrations of amines can be toxic to humans and animals. Since the above-mentioned samples all have higher concentrations of other organic compounds, the ability to selectively, sensitively, quickly and online detect the concentration of volatile amines is of great significance for environmental protection, industrial detection and food control. [0003] The surface ionization de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/62
Inventor 关亚风李伟伟朱道乾朱蕴卿徐静
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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