Heating atomizing device of evaporative light-scattering detectors

Abstract

The invention discloses a heating atomizing device of evaporative light-scattering detectors. The atomizing effect of the heating atomizing device is excellent; the heating atomizing device comprisesan atomizing chamber; an atomizing pipe is arranged in the atomizing chamber; one end of the atomizing pipe is provided with an atomizing nozzle; the atomizing nozzle is provided with a gas inlet which is used for introduction of eluent, and a gas inlet which is used for introduction of atomizing gas; one end of the atomizing pipe far away from the atomizing nozzle is provided with a waste liquidoutlet; and the atomizing nozzle is provided with a temperature sensor, and a heating pipe which is controlled by the temperature sensor.

Description

technical field [0001] The invention relates to a heating atomization device for an evaporative light scattering detector. Background technique [0002] The atomization unit is an important part of the evaporative light scattering detector. Its function is to atomize the eluent flowing out of the liquid chromatography system at the front end of the ELSD to form an aerosol, and transport the aerosol to the evaporative light scattering detector. in the desolvation system. The atomizing device includes a nozzle, an atomizing tube, and a space for placing the nozzle and the atomizing tube. [0003] The existing atomization unit has the following problems when working: [0004] 1. The atomization process completed in the nozzle is a strong endothermic process (such as when using 100% organic solvents such as methanol and acetonitrile), which causes the temperature of the nozzle (stainless steel material) to be maintained at a very low level during the operation of the instrumen...

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Problems solved by technology

However, the flow of other solutions (oily solutions) with high viscosity coefficients is very sensitive to temperature changes. When the temperature drops, their viscosity coefficients increase significantly, resulting in the fluidity of the chromatographic column eluent coming in from the liquid inlet. Extremely poor, the liquid "sticks" to the small hole of the nozzle, which greatly affects the atomization effect of the nozzle; however, not all situations use heating atomization, for example, when a shorter equilibrium time is required, the heating needs to be turned off , which reduces the amount of solvent sputtered into the drift tube during evaporation, increasing sensitivity for semivolatile samples

[0005] 2. Due to the low temperature of the nozzle during atomization, many solutes will crystallize in the nozzle, thus blocking the nozzle

The nozzle is an extremely precise part. After it is blocked, it is difficult to clean and unclog it, so it can only be scrapped

[0006] 3. After atomization, the low-temperature aerosol will be sprayed into the atomization tube at a divergent angle. Except for the aerosol approximately parallel to the axis of the atomization tube, it can enter the subsequent desolution system through the small locking cap of the atomization tube. All will hit the inner wall of the atomizing tube, condense into liquid and flow out from the waste liquid port. Since the aerosol is low temperature, the temperature of the atomizing tube will gradually decrease, and condensed water will appear on the outer wall, which will make the safety of the instrument Hidden danger

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