Electronic-grade hydrofluoric acid preparation device

Abstract

The invention discloses an electronic-grade hydrofluoric acid preparation device, which comprises a reaction tank and a water inlet pipe, wherein a fluorite feeding port and a sulfuric acid feeding port are formed above the reaction tank and communicate with the reaction tank, a fixing box is welded and fixed to the top of the reaction tank, and is rotationally connected with a stirring shaft, stirring rings are symmetrically welded and fixed to the bottom of the stirring shaft, a discharging valve is arranged at the bottom of the reaction tank, the water inlet pipe is communicated with a discharging valve, a water outlet pipe is connected to the outer side of the water inlet pipe, a filter core is arranged at the end, located in the water outlet pipe, of the water inlet pipe, and an impurity pipe is connected to the top, located in the water outlet pipe, of the water inlet pipe. According to the invention, since a reaction of fluorite and concentrated sulfuric acid needs to be heated, a thermoelectric power generation sheet generates current, a stirring shaft is driven to rotate to stir reactants, so that the reaction is more sufficient, the reaction rate is improved, the production cost is saved, and the production efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of chemical production, in particular to an electronic-grade hydrofluoric acid preparation device. Background technique [0002] Due to its ability to dissolve oxides, hydrofluoric acid plays an important role in the purification of aluminum and uranium. Hydrofluoric acid is also used to etch glass, engraving patterns, marking scales and characters; the semiconductor industry uses it to remove oxides on the surface of silicon, and it can be used in refineries for the alkylation reaction of isobutane and n-butene Catalyst, hydrofluoric acid is also used in the "pickling" process that removes oxygen-containing impurities from the surface of stainless steel. Hydrofluoric acid is also used in the synthesis of various fluorine-containing organic compounds, such as Teflon (polytetrafluoroethylene) and refrigerants such as Freon. [0003] Most of the existing hydrofluoric acid preparation devices use fluorite and...

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Problems solved by technology

[0003] Most of the existing hydrofluoric acid preparation devices use fluorite and concentrated sulfuric acid to mix and heat to 700°C in a reactor to prepare hydrofluoric acid. However, because the concentrated sulfuric acid is viscous and the fluorite is a powder device, the reaction contact area is small. , the rate of reaction is slow, which affects production efficiency, and the reaction will produce calcium sulfate at the same time. Because the solubility of calcium sulfate is small, more calcium sulfate solids will be produced, which needs to be filtered. However, the existing filter device It cannot be backwashed. When the filtering effect is reduced, it is necessary to extract the hydrofluoric acid inside the device, and at the same time dilute the inside of the device with a large amount of clean water, and then disassemble the device for cleaning and replacement of the filter element. The operation is more complicated, and at the same time Production cannot be carried out during cleaning, which reduces production efficiency

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