Long-distance automatic sampling device and method for liquid-state hydrogen fluoride solution

Abstract

The invention relates to a long-distance automatic sampling device for a liquid-state hydrogen fluoride solution. The device comprises a liquid storage pot, wherein an outlet liquid inlet of a liquid outlet pipe extends into the liquid storage pot, and an outlet liquid outlet is connected with a connecting pipe; the top of a sampling bottle is provided with a dismountable doubleport PTFE cutting sleeve bottle cap; a liquid inlet pipe penetrates through the doubleport PTFE cutting sleeve bottle cap, and the inlet liquid outlet extends into the sampling bottle and is positioned above the liquid level of a diluent; one end of an air outlet pipe penetrates through the doubleport PTFE cutting sleeve bottle cap, extends into the sampling bottle and is positioned above the liquid level of the diluent; the other end of the air outlet pipe is communicated with an air exhaust tank which is in dynamic sealing with a piston; and the movement of the piston is controlled through a controller electrically connected with an air cylinder. The invention also provides a sampling method of the long-distance automatic sampling device. In the sampling process, the long-distance automatic sampling device for the liquid-state hydrogen fluoride solution ensures the leakproofness of the system by matching of tanks, pipelines and valves, so that the system is completely isolated with the atmospheric environment, and no hydrogen fluoride air overflows.

Description

technical field [0001] The present invention relates to the sampling of hydrogen fluoride, in particular to a remote automatic sampling device and method for liquid hydrogen fluoride solution. Background technique [0002] Hydrofluoric acid is a colorless transparent fuming liquid, which is an aqueous solution of hydrogen fluoride gas, which is weakly acidic and has a pungent odor. Hydrofluoric acid can react with silicon and silicon compounds to generate gaseous silicon tetrafluoride (which can corrode glass), but it has no corrosive effect on plastics, paraffin, lead, gold, and platinum. [0003] In the electrolytic aluminum industry, hydrogen fluoride is used in the production of aluminum fluoride and cryolite, in the synthesis of chlorofluorocarbons for refrigerants and blowing agents, and in the synthesis of polymers. During the processing of uranium, hydrogen fluoride can convert uranium dioxide into uranium tetrafluoride and uranium hexafluoride, respectively, and ur...

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Problems solved by technology

[0008] In order to solve the problem of relying on static pressure or gravity in the above-mentioned prior art and the safety hazards such as residual hydrogen fluoride in the pipeline during the sampling process, the present invention aims to provide a remote automatic sampling device and method for liquid hydrogen fluoride solution

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