Thermal desorption, gas-phase separation and thermal cracking system based on ethylation derivation of methyl mercury

Abstract

The invention discloses a thermal desorption, gas-phase separation and thermal cracking system based on ethylation derivation of methyl mercury, comprising a thermal desorption part, a gas-phase separation part, a thermal cracking part, a gas flowmeter, a Teflon FEP pipeline and a pressure regulating and temperature control switch chamber, wherein the thermal desorption part comprises a thermal desorption heater strip switch, a thermal desorption heater strip time control switch, a thermal desorption heater strip pressure regulator, a pressure regulating knob of the thermal desorption heater strip pressure regulator, a thermal desorption heater strip and a Tenax adsorption pipe; the gas-phase separation part comprises a heater jacket, a heater jacket switch, an OV-3 packed column and a heater jacket temperature control plate; and the thermal cracking part comprises a thermal cracking heater strip switch, a thermal cracking heater strip time control switch, a thermal cracking heater strip pressure regulator, a pressure regulating knob of the thermal cracking heater strip pressure regulator, a thermal cracking heater strip and a quartz pipe. The system realizes the aim of integration of thermal desorption, gas-phase separation and thermal cracking devices, and simultaneously, each part can be individually operated, thereby saving the analysis time, having low manufacturing cost and greatly reducing experiment cost.

Description

technical field [0001] The invention relates to the technical field of analysis devices, in particular to a thermal analysis-gas phase separation-pyrolysis system based on methylmercury derived from ethylation. Background technique [0002] Mercury and its compounds are a class of highly toxic persistent toxic pollutants, among which methylmercury is a highly toxic form. During the analysis of methylmercury, gas chromatography or high performance liquid chromatography is often used for separation. Although high-performance liquid chromatography can achieve better separation results, the dilution of the mobile phase makes the detection limit of the method higher, and the reduction of the detection limit through the extraction method greatly increases the analysis cost. Gas chromatography is easy to combine with purge and trap technology, extraction technology and other methods to achieve the advantages of simple operation, low interference and high sensitivity. [0003] At ...

AI Technical Summary

Problems solved by technology

[0004] At present, foreign companies have produced a methylmercury analyzer that integrates the above three parts, but the whole set of equipment has the disadvantages of high price, high degree of integration, difficult to operate alone, and difficult to combine with other detectors.

Domestically, there are few reports on the redesign and modification of thermal analysis, gas phase separation and thermal cracking.

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