A safe new stirrer for sodium hexafluorophosphate synthesis

Abstract

The utility model relates to a safe new -type stirrer for sodium hexafluorophosphate synthesis, including container, motor, stirring shaft, folding leaf paddle type stirring blade, spiral band type stirring blade, anchor type stirring blade and anti -blocking block, the upper portion of container is provided with the cover, is provided with the rack on the cover, the motor sets up in the rack and is connected with stirring shaft drive, the stirring shaft passes through the cover and extends to the inside of container, the part of stirring shaft in container is from top to bottom in proper order is provided with folding leaf paddle type stirring blade, spiral band type stirring blade, anchor type stirring blade, the bottom of container is provided with material outlet, the anti -blocking block sets up in the lower extreme of stirring shaft and with material outlet top, utilize anti -blocking block and guide the stirring circulation flow into the material outlet, avoid material outlet to become the dead angle of crystallization deposition, make the smooth discharge, eliminate the security risk because of the jam.

Description

Technical Field

[0001] This utility model relates to the field of chemical stirring devices, specifically to a safe new stirrer for the synthesis of sodium hexafluorophosphate. Background Technology

[0002] The sodium hexafluorophosphate synthesis solution is a key intermediate in the preparation of sodium hexafluorophosphate, and its properties are closely related to the reaction conditions, composition, and subsequent processing. The main components of the synthesis solution include anhydrous hydrogen fluoride (HF), phosphorus pentafluoride (PF5), and sodium fluoride (NaF). HF, acting as both a solvent and reactant, exhibits extremely strong corrosiveness and reactivity. The reaction vessel must be made of 316L stainless steel. Furthermore, the reaction between PF5 and HF is vigorous, requiring cooling to -5 to 0°C using a refrigerant to control the reaction rate and prevent overheating. The synthesis solution and intermediate products are highly sensitive to moisture and oxygen; the reaction must be carried out under nitrogen protection to prevent deliquescence or oxidation side reactions. The reactor must be well-sealed to prevent material leakage and ensure operational safety.

[0003] The existing reaction vessel has a material outlet at the bottom, which creates a dead zone for stirring. The sodium hexamethylenetetramine crystals produced by the reaction will continuously precipitate in the outlet, eventually clogging it, affecting the discharge process, and creating a safety hazard. Summary of the Invention

[0004] The purpose of this invention is to solve the above-mentioned problems and provide a safe new stirrer for the synthesis of sodium hexafluorophosphate, specifically achieved through the following technical solution: A novel, safe stirrer for the synthesis of sodium hexafluorophosphate includes a container, a motor, a stirring shaft, folding paddle-type stirring blades, ribbon-type stirring blades, anchor-type stirring blades, and an anti-clogging block. The container has a cover at its top, with a frame mounted on the cover. The motor is mounted on the frame and is driven by the stirring shaft, which extends through the cover into the container. The portion of the stirring shaft inside the container has, from top to bottom, folding paddle-type stirring blades, ribbon-type stirring blades, and anchor-type stirring blades. These blades stir the liquid, creating an upward-flowing fluid. The fluid encounters the folding paddle-type stirring blades and diffuses laterally, then flows downwards along the inner wall of the container, forming a circulating flow from the center upwards and down the edges. A material outlet is located at the bottom of the container. The anti-clogging block is located at the lower end of the stirring shaft and above the material outlet. The anti-clogging block has a sloped or arc-shaped surface opposite the material outlet. The fluid flowing downwards along the inner wall of the container and then laterally along the bottom encounters the anti-clogging block and washes away the material outlet.

[0005] The novel stirrer for the safe synthesis of sodium hexafluorophosphate is further designed in that a guide tube is provided inside the container, the stirring shaft, the ribbon stirring blade and the anchor stirring blade are located inside the guide tube, and the folding blade stirring blade is located above the guide tube.

[0006] The novel stirrer for the safe synthesis of sodium hexafluorophosphate is further designed in that the anti-clogging block is connected to the lower end of the stirring shaft through a hollow tube, and the upper side wall of the hollow tube is provided with an elongated hole.

[0007] The novel stirrer for the safe synthesis of sodium hexafluorophosphate is further designed in that the stirring shaft is provided with a magnetic fluid seal at the connection of the cover body.

[0008] The beneficial effects of this utility model are as follows: By using anti-clogging blocks, the agitation circulation flow is guided into the material outlet, preventing the material outlet from becoming a dead zone for crystallization and precipitation, ensuring smooth discharge, and eliminating safety hazards caused by blockage. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0010] Figure 2 This is a schematic diagram of the anti-clogging block of this utility model.

[0011] In the diagram, 1 is the motor, 2 is the reducer, 3 is the magnetohydrodynamic seal, 4 is the folding paddle-type agitator, 5 is the ribbon-type agitator, 6 is the anchor-type agitator, 7 is the anti-clogging block, and 8 is the agitator shaft. Detailed Implementation

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments: As shown in the figure, a novel, safe stirrer for the synthesis of sodium hexafluorophosphate includes a container, a motor 1, a stirring shaft 8, a folding blade stirring blade 4, a ribbon stirring blade 5, an anchor stirring blade 6, and an anti-clogging block 7. The container has a cover on top, and a frame is mounted on the cover. The motor is mounted on the frame and is connected to the stirring shaft via a reducer 2. The stirring shaft extends through the cover into the interior of the container. The portion of the stirring shaft inside the container, from top to bottom, includes the folding blade stirring blade, the ribbon stirring blade, the anchor stirring blade, and the ribbon stirring blade. The blades and anchor-type agitators stir the liquid to form an upward fluid. The fluid encounters the folded-blade agitator and spreads laterally, then flows down along the inner wall of the container, thus forming a circulating flow from the center of the container upwards and down along the edge of the container. The bottom of the container has a material outlet. The anti-clogging block is located at the lower end of the agitator shaft and above the material outlet. The anti-clogging block has an inclined or arc-shaped surface opposite to the material outlet. The fluid flowing down along the inner wall of the container and then laterally along the bottom of the container encounters the anti-clogging block and then washes away the material outlet.

[0013] Specifically, the diameter of the folding-blade agitator is 60%–80% of the container's diameter, with two blades. Its rotation speed is relatively slow, and the liquid mainly moves axially and tangentially within the stirred tank, resulting in a lower radial velocity and a lower head. The ribbon agitator features a large radius of rotation, a wide agitation range, a slow rotation speed, and a low head. The anchor agitator has an even larger radius of rotation (the diameter of the anchor agitator is 90%–95% of the container's diameter), an even lower rotation speed, and a smaller head, but its agitation range is very large. This agitator significantly improves production efficiency and safety through its integrated structure (reaction-crystallization-maturation integration). By adopting the above technical solutions, this new agitator keeps the crystalline solids suspended in the liquid. The ribbon agitator causes the inner liquid to flow upwards, while the folding-blade agitator causes it to flow downwards from the outside. The fluid on the outside reaches the bottom of the container and fills the inner fluid, forming a circulation. This results in a more significant circulation effect and a faster circulation speed, thereby improving agitation efficiency. A blockage block placed at the bottom of the stirring shaft can effectively prevent material from accumulating and sticking to the bottom outlet during rotation, thus preventing blockage.

[0014] The container is equipped with a flow guide tube 9, and the stirring shaft, the ribbon stirring blade and the anchor stirring blade are located inside the flow guide tube, while the folding blade stirring blade is located above the flow guide tube 9.

[0015] The anti-clogging block 7 is connected to the lower end of the stirring shaft through a hollow tube 71, and the upper side wall of the hollow tube is provided with an elongated hole 72.

[0016] The stirring shaft is equipped with a magnetohydrodynamic (MHD) seal at the connection point with the cover. MHD is an advanced sealing technology that combines the properties of magnetohydrodynamics with the requirements of stirring equipment. Compared to traditional seals (such as mechanical seals and packing seals), MHD performs exceptionally well in stirring equipment: the liquid seal ring formed by the magnetohydrodynamics can completely fill the gap, with a leakage rate as low as 10%. -12 Pa·m 3 / s, particularly suitable for sealing toxic media (hydrogen fluoride), preventing moisture and oxygen in the air from affecting material synthesis. No solid friction debris is generated, avoiding media contamination; non-contact sealing reduces mechanical wear, resulting in long service life and low maintenance costs. The magnetofluid itself has lubricating properties, reducing power loss of the rotating shaft and making it suitable for high-speed stirring. Bidirectional pressure resistance allows it to cope with pressure direction changes without structural adjustments, ensuring safety and reliability.

Claims

1. A novel, safe stirrer for the synthesis of sodium hexafluorophosphate, characterized in that, The system includes a container, a motor, a stirring shaft, folding paddle-type stirring blades, ribbon-type stirring blades, anchor-type stirring blades, and an anti-clogging block. The container has a cover at its top, with a frame mounted on the cover. The motor is mounted on the frame and is connected to the stirring shaft via a drive mechanism. The stirring shaft extends through the cover into the interior of the container. The portion of the stirring shaft inside the container has, from top to bottom, folding paddle-type stirring blades, ribbon-type stirring blades, and anchor-type stirring blades. The ribbon-type and anchor-type stirring blades stir the liquid, creating an upward-moving fluid. The fluid encounters the folding paddle-type stirring blades and diffuses laterally, then flows downwards along the inner wall of the container, thus forming a circulating flow from the center of the container upwards and down along the edges. A material outlet is located at the bottom of the container. The anti-clogging block is located at the lower end of the stirring shaft and above the material outlet. The anti-clogging block has a sloped or arc-shaped surface opposite the material outlet. The fluid flowing downwards along the inner wall of the container and then laterally along the bottom encounters the anti-clogging block and washes away the material outlet.

2. The novel, safe stirrer for the synthesis of sodium hexafluorophosphate according to claim 1, characterized in that, The container is equipped with a flow guide tube, and the stirring shaft, the ribbon stirring blade and the anchor stirring blade are located inside the flow guide tube, while the folding blade stirring blade is located above the flow guide tube.

3. The novel, safe stirrer for the synthesis of sodium hexafluorophosphate according to claim 1, characterized in that, The anti-clogging block is connected to the lower end of the stirring shaft through a hollow tube, and the upper side wall of the hollow tube is provided with an elongated hole.

4. A novel, safe stirrer for the synthesis of sodium hexafluorophosphate according to claim 1, characterized in that, The stirring shaft is equipped with a magnetic fluid seal at the connection of the cover.

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