Phosphorus pentafluoride gas reactor

Abstract

The utility model relates to the technical field of phosphorus chemical production equipment, and particularly discloses a phosphorus pentafluoride gas reactor. Which comprises a reaction tank, a stirring shaft arranged in the stirring tank and a stirring motor for driving the stirring shaft to rotate, and is characterized in that the stirring shaft is horizontally arranged in the reaction tank; the technical problem that phosphorus pentachloride and anhydrous hydrogen fluoride cannot be uniformly mixed when phosphorus pentafluoride is prepared by a gas-solid reactor in the prior art is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to phosphorus chemical production equipment technical field, concretely is a phosphorus pentafluoride gas reactor. BACKGROUND

[0002] Lithium hexafluorophosphate is an important lithium ion battery electrolyte material, it conducts ions and ion compounds between the positive and negative poles of the battery, with the development of new energy vehicles, lithium hexafluorophosphate is concerned because of its important role in lithium ion batteries.

[0003] The mainstream method for preparing lithium hexafluorophosphate at present is gas-solid reaction method, which is to react lithium fluoride with anhydrous hydrogen fluoride to generate porous lithium fluoride, and then to react the porous lithium fluoride with phosphorus pentafluoride gas to generate lithium hexafluorophosphate. Since phosphorus pentafluoride is in a gaseous state, it is not easy to store and transport, and is usually self-made for use. Therefore, before preparing lithium hexafluorophosphate, phosphorus pentafluoride needs to be prepared first. At present, in the production of lithium hexafluorophosphate, phosphorus pentafluoride is usually prepared by chemical reaction of anhydrous hydrogen fluoride and phosphorus pentachloride.

[0004] Usually, a reactor is used in the production of phosphorus pentafluoride. In the prior art, solid phosphorus pentachloride is usually added to a reaction kettle or a reaction tank, and then gaseous anhydrous hydrogen fluoride is introduced. The mixture is stirred to generate a mixed gas product of phosphorus pentafluoride and hydrogen chloride. For example, a gas-solid reaction device is disclosed in the patent document with the application number CN202322244225.9. The mixing structure of the stirring shaft is disclosed in the structure. In the usual gas-solid reactor, the stirring shaft is used for stirring. In this patent document, a push plate is also provided to reduce the space of the reactor to avoid the situation that the gas and the solid cannot contact each other.

[0005] In the prior art, the gas-solid mixing method using the stirring shaft is simple and the equipment investment is small. However, the reactants are in a gaseous and solid state, which is affected by the density. The solid phosphorus pentachloride usually deposits at the bottom of the reactor, and the gaseous anhydrous hydrogen fluoride reactant floats above the reactor. Only the fan is used for stirring, which cannot fully mix the solid reactant at the bottom with the gaseous reactant. Even if the push plate is used to reduce the space of the reactor, the solid reactant and the gaseous reactant can only be more fully contacted at the contact interface. However, the solid reactant at the bottom of the reactor still cannot be uniformly mixed with the gaseous reactant. UTILITY MODEL CONTENTS

[0006] The utility model aims at providing a phosphorus pentafluoride gas reactor to solve the technical problem that the gas-solid reactor in the prior art cannot uniformly mix phosphorus pentachloride with anhydrous hydrogen fluoride when preparing phosphorus pentafluoride.

[0007] In order to solve the above problems, the technical scheme adopted by the utility model is as follows: a phosphorus pentafluoride gas reactor, comprising a reaction tank, a stirring shaft arranged in the stirring tank and a stirring motor for driving the stirring shaft to rotate, the stirring shaft is horizontally arranged in the reaction tank, and the stirring shaft is provided with stirring blades capable of lifting materials.

[0008] The embodiment has the following beneficial effects:

[0009] 1. The stirring shaft in the prior art is usually vertically arranged, so the stirring blades on the stirring shaft are horizontally arranged, so that only horizontal disturbance is generated during stirring, so that the upper layer and the lower layer cannot be fully mixed, so the stirring blades in the prior art usually have a certain upward curvature, so that the upward thrust generated during rotation can make the materials move upward, thereby mixing the materials in the upper layer and the lower layer, this method is more suitable for liquid phase reactions, but in the preparation of phosphorus pentafluoride, the reactants are solid phosphorus pentachloride and gaseous anhydrous hydrogen fluoride, the curvature of the stirring blades is used to make the phosphorus pentachloride move upward, and the upward range of the phosphorus pentachloride is limited due to the influence of gravity and density, and the gaseous anhydrous hydrogen fluoride cannot sink to contact, so the mixing degree is low and the mixing is not uniform, but in the present application, the stirring shaft is horizontally arranged, and the stirring blades are vertically arranged, when the stirring shaft rotates, the stirring blades can lift the solid phosphorus pentachloride at the bottom and throw it into the upper layer of the reactor to contact the gaseous anhydrous hydrogen fluoride, so that the mixing is more uniform compared with the prior art.

[0010] Further, the stirring shaft is provided with stirring blades, and the stirring blades are arranged alternately.

[0011] Further, the stirring blades comprise stirring blade surfaces, and the stirring blade surfaces are provided with lifting grooves. The lifting grooves can shovel the phosphorus pentachloride when the stirring blades are inserted into the phosphorus pentachloride, and the phosphorus pentachloride can be lifted by the rotation of the stirring shaft, so that the mixing is more uniform.

[0012] Further, the stirring blade surfaces are cylindrical. The resistance of the stirring blades to disturbance in the phosphorus pentachloride is reduced, and the rotation is more smooth.

[0013] Further, the lifting grooves are helical grooves on the circumferences of the stirring blade surfaces. The helical grooves make the lifted phosphorus pentachloride receive a transverse force, so that the phosphorus pentachloride expands in the transverse direction, and the coverage area is wider, which is beneficial to the contact and mixing of the phosphorus pentachloride and the anhydrous hydrogen fluoride.

[0014] Further, the reaction tank is a jacket structure. The jacket structure can pass a heat exchange medium into the jacket to control the heat exchange temperature. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 The utility model discloses an embodiment of the utility model's front view,

[0016] Figure 2 This is a schematic diagram of the internal structure of the side of an embodiment of the present utility model.

[0017] Figure 3 This is a top view of an embodiment of the present utility model.

[0018] Figure 4 This is a schematic diagram of the stirring fan blade structure in an embodiment of the present invention. Detailed Implementation

[0019] The following detailed description illustrates the specific implementation method:

[0020] The reference numerals in the accompanying drawings include: stirring motor 1, motor pad 11, reaction tank frame 2, stirring shaft 3, stirring bearing 31, stirring blade 32, connecting platform 321, stirring blade surface 322, lifting trough 323, reaction tank 4, drain port 41, reaction residue outlet 42, jacket outlet 43, solid material addition port 44, gas outlet 45, gaseous material inlet 46, gaseous material spare port 47, spare gas outlet 48, nitrogen inlet 49, nitrogen spare port 410, and jacket inlet 411.

[0021] Implementation, for example, attached Figures 1-4 As shown: A phosphorus pentafluoride gas reactor includes a reaction vessel 4, which is a horizontally positioned cylindrical vessel. A reaction vessel frame 2 is provided below the reaction vessel 4. The reaction vessel frame 2 is a frame structure welded from angle steel, so that the circumference of the reaction vessel 4 can be just fitted into the frame. The reaction vessel 4 and the reaction vessel frame 2 are fixed with bolts, and the reaction vessel frame 2 is fixed to the ground with ground nails; alternatively, bolts can be pre-embedded in the ground, and the reaction vessel frame 2 can be fixed to the ground with bolts and nuts.

[0022] A stirring motor 1 is installed beside the reaction vessel 4. A motor pad 11 is installed below the stirring motor 1, and the motor pad 11 is the same as that of the reaction vessel 2, connected to the ground using ground nails. A chain wheel is keyed to the output shaft of the stirring motor 1. Figure 2 The direction is described as reverse. A chain wheel is also welded to the left end of the stirring shaft 3. The stirring motor 1 is connected to the stirring shaft 3 through the chain wheel and chain. The stirring shaft 3 is horizontally set inside the reaction vessel 4 and extends laterally through the reaction vessel 4. The two ends of the stirring shaft 3 are connected by stirring bearings 31 at the points where they pass through the reaction vessel 4, so that the stirring shaft 3 can rotate relative to the reaction vessel 4. The stirring bearings 31 are sealed to prevent air leakage from the reaction vessel 4 at the stirring bearings.

[0023] The reaction vessel 4 has multiple material inlets and outlets, and a solid material addition port 44 is located at the top of the reaction vessel. Figure 3The direction is a description direction, and the gaseous material inlet 46 and the gaseous material standby port 47 are arranged on the right side of the solid material adding port 44. In the production of phosphorus pentafluoride, solid phosphorus pentachloride is put into the solid material adding port 44, and gaseous anhydrous hydrogen fluoride is introduced into the gaseous material inlet 46. The nitrogen inlet 49 and the nitrogen standby port 410 are arranged on the left side of the solid material adding port 44, so that the concentration of anhydrous hydrogen fluoride can be diluted by nitrogen, and the intensity of the reaction can be controlled. The right side of the nitrogen inlet 49 is provided with the gas outlet 45 and the standby gas outlet 48, which are the main outlets of phosphorus pentachloride gas after the reaction is completed. When the reaction amount is large and the pressure in the reaction tank 4 is large, the gas outlet 45 and the standby gas outlet 48 can also be opened at the same time to quickly discharge phosphorus pentachloride. The blowdown port 41 and the reaction residual material outlet 42 are arranged below the reaction tank 4, which are used for blowdown during cleaning and discharge of reaction residues after the reaction is completed.

[0024] Since the reaction of phosphorus pentafluoride needs to be controlled, the reaction tank 4 is a jacket structure, and the jacket inlet 411 of the jacket is arranged at the upper end of the right side of the reaction tank 4, and the jacket outlet 43 is arranged at the lower end of the reaction tank 4, so that the heat exchange medium in the jacket can be easily discharged.

[0025] The stirring blades 32 are arranged on the stirring shaft 31 in the reaction tank 4, and the stirring blades 32 are arranged equidistantly on the stirring shaft, but the blades are arranged staggered. If the stirring blades 32 are arranged on the same vertical line, when the stirring shaft 31 starts to rotate, the stirring blades 32 are driven to rotate. When the previous stirring blade 32 is inserted into the solid phosphorus pentachloride, the phosphorus pentachloride is pushed to the two sides of the blade to form a groove. If the blades are arranged on the same vertical line, when the other blade is inserted, it will be inserted into the groove and will not disturb the phosphorus pentachloride at the bottom of the reactor. By staggering the blades, when the other blade is inserted, it can avoid the groove and disturb the phosphorus pentachloride on both sides of the groove. The stirring blades 32 are arranged as shown in the figure. Figure 4As shown, the structure comprises a connecting table 321, a stirring blade surface 322, and a lifting groove 323. The connecting table 321 is mainly used to fixedly connect the stirring fan blade 32 and the stirring shaft 31. The connecting table 321 is provided with a threaded hole, and the stirring shaft 31 is also provided with a threaded hole, so that the stirring shaft 31 and the stirring fan blade 32 can be connected by bolts. The stirring blade surface 322 of the stirring fan blade 32 is in a cylindrical shape, and the stirring blade surface 322 is provided with a lifting groove 323. The lifting groove 323 extends from one end of the connecting table 321 to the end of the stirring blade surface 322, so that the end of the stirring blade surface 322 has an opening. The lifting groove 323 is not a straight groove on the stirring blade surface 322, but a groove along the helix on the circumference of the stirring blade surface 322. Therefore, when the stirring fan blade 32 is inserted into the solid phosphorus pentachloride, the phosphorus pentachloride will be scooped into the lifting groove 323 and lifted in the air to mix with gaseous anhydrous hydrogen fluoride. Due to the spiral groove, the lifted phosphorus pentachloride will have a certain inclination direction, and will not be scattered along the circumference of the rotating stirring fan blade 32, so that it has a horizontal component force, which makes the phosphorus pentachloride spread horizontally, so that the covering area of the phosphorus pentachloride is larger, and the mixing of the phosphorus pentachloride and the anhydrous hydrogen fluoride is more uniform.

[0026] The above is only an embodiment of the present application, and the specific structure and characteristics of the scheme are not described in detail. It should be pointed out that for those skilled in the art, without departing from the structure of the present application, a number of modifications and improvements can be made, which should be regarded as the protection scope of the present application. The protection scope of the present application should be subject to the content of its claims, and the specific implementation mode and the like in the specification can be used to explain the content of the claims.

Claims

1. A phosphorus pentafluoride gas reactor, comprising a reaction vessel, a stirring shaft disposed within the stirring vessel, and a stirring motor for driving the stirring shaft to rotate, characterized in that: The stirring shaft is horizontally arranged in the reaction tank, and stirring blades capable of lifting materials are arranged on the stirring shaft; the stirring blades are provided with lifting grooves which are helical grooves on the circumferences of the stirring blade surfaces.

2. The phosphorus pentafluoride gas reactor of claim 1, wherein: The stirring blades are staggered.

3. The phosphorus pentafluoride gas reactor of claim 2, wherein: The stirring blades comprise stirring blade surfaces which are cylindrical.

4. The phosphorus pentafluoride gas reactor of claim 1, wherein: The reaction tank is of a jacket structure.

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