Preparation device for continuously preparing hydrofluoric acid

Abstract

The utility model discloses a preparation device for continuously preparing hydrofluoric acid, which comprises a microchannel reactor which is respectively provided with an anhydrous hydrogen fluoride input end, a water input end and a hydrofluoric acid output end, the anhydrous hydrogen fluoride input end is connected with an anhydrous hydrogen fluoride cooling storage tank through an anhydrous hydrogen fluoride metering pump; the water input end is connected with the water storage tank through the water metering pump; anhydrous hydrogen fluoride and water are mixed in a microchannel of the microchannel reactor; the utility model provides a safe and reliable environment for preparing hydrofluoric acid, and realizes continuous preparation of hydrofluoric acid; and the space is greatly saved, and on-site operation and control are facilitated.

Description

Technical Field

[0001] The utility model belongs to a preparation device for hydrofluoric acid, in particular to a preparation device for continuously preparing hydrofluoric acid. Background Art

[0002] Hydrofluoric acid is extremely corrosive and can severely corrode metal, glass, and other objects. Hydrofluoric acid is prepared by mixing anhydrous hydrogen fluoride with pure water. Upon contact, the two react violently and generate a large amount of heat, releasing 1732.5 kJ / kg. If this heat is not promptly dissipated, it can easily cause equipment to overheat and overpressure, leading to safety accidents.

[0003] Therefore, the applicant hopes to seek technical solutions to solve the above technical problems. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a preparation device for continuously preparing hydrofluoric acid, which provides a safe and reliable environment for preparing hydrofluoric acid and realizes the continuous preparation of hydrofluoric acid; and greatly saves space, which is conducive to on-site operation and control.

[0005] The technical solutions adopted in this utility model are as follows:

[0006] A preparation device for continuously preparing hydrofluoric acid, comprising a microchannel reactor, wherein the microchannel reactor is respectively provided with an anhydrous hydrogen fluoride input end, a water input end, and a hydrofluoric acid output end;

[0007] The anhydrous hydrogen fluoride input end is connected to the anhydrous hydrogen fluoride cooling tank through an anhydrous hydrogen fluoride metering pump;

[0008] The water input end is connected to the water storage tank via a water metering pump;

[0009] Anhydrous hydrogen fluoride and water are mixed in the microchannel of the microchannel reactor.

[0010] Preferably, the microchannel reactor is a silicon carbide microchannel reactor; and its outlet is made of fluorine-lined material.

[0011] Preferably, the microchannel reactor is also connected to a cooling water circulation loop; wherein, the cooling water circulation loop includes: a circulating water outlet connected to the microchannel reactor, the circulating water outlet is connected to a heat exchanger; the cooling water output end of the heat exchanger is connected to the cooling water inlet and outlet end of the microchannel reactor.

[0012] Preferably, the heat exchanger is a shell and tube heat exchanger, and its pipelines are made of 304 stainless steel.

[0013] Preferably, the cooling water output end of the heat exchanger is connected to a water storage tank; the water storage tank is connected to the cooling water inlet and outlet of the microchannel reactor through a cooling water circulation pump.

[0014] Preferably, the water storage tank is connected to a normal temperature soft water input pipeline.

[0015] Preferably, the anhydrous hydrogen fluoride metering pump and the water metering pump are both three-plunger hydraulic diaphragm pumps, and the output end of each three-plunger hydraulic diaphragm pump is connected to a pulse damper for reducing pulses and achieving balanced output of flow.

[0016] Preferably, the outlet of each three-plunger hydraulic diaphragm pump is provided with a flow sensor for real-time monitoring of the output flow changes of its corresponding diaphragm pump, wherein the feedback signal of the flow sensor is interlocked with the corresponding diaphragm pump motor, and the output flow is controlled by frequency conversion to adjust the motor speed.

[0017] Preferably, the front part of the anhydrous hydrogen fluoride metering pump is made of 316L stainless steel, the flow-through material of its pump head is made of Monel 400 alloy, and the rear part of the pump is made of 316L stainless steel and fluorine-lined material; the front part of the water metering pump is made of 304 stainless steel, the pump head is made of 304 stainless steel, and the rear part of the pump is made of 304 stainless steel and fluorine-lined material.

[0018] Preferably, the temperature of the hydrofluoric acid output end of the microchannel reactor is less than 40°C.

[0019] The utility model proposes to use a microchannel reactor as a device for preparing hydrofluoric acid, and simultaneously continuously feeds the hydrofluoric acid through an anhydrous hydrogen fluoride metering pump and a water metering pump. Since the narrow microchannel structure in the microchannel reactor cuts the reaction fluid flowing therethrough, and the narrow microchannel structure has a large specific surface area, the temperature gradient is increased, and instantaneous uniform mixing and efficient heat transfer of the reaction fluid in a micron space are achieved, which significantly improves the degree of fluid mixing, instantly removes reaction heat, and improves the overall heat transfer efficiency, provides a safe and reliable environment for preparing hydrofluoric acid, and realizes the continuous preparation of hydrofluoric acid. In addition, the utility model uses the microchannel reactor as the preparation device, which greatly saves space and is conducive to on-site operation and control. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the connection structure of a preparation device for continuously preparing hydrofluoric acid under a specific embodiment of the present utility model. DETAILED DESCRIPTION

[0021] This embodiment provides a preparation device for continuously preparing hydrofluoric acid, including a microchannel reactor. The microchannel reactor is respectively provided with an anhydrous hydrogen fluoride input end, a water input end, and a hydrofluoric acid output end; the anhydrous hydrogen fluoride input end is connected to an anhydrous hydrogen fluoride cooling tank via an anhydrous hydrogen fluoride metering pump; the water input end is connected to a water storage tank via a water metering pump; and the anhydrous hydrogen fluoride and water are mixed in the microchannels of the microchannel reactor.

[0022] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the following will be combined with the drawings of the embodiments of the present invention to clearly and completely describe the technical solutions of the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0023] See Figure 1 As shown, a preparation device for continuously preparing hydrofluoric acid includes a microchannel reactor 10, which is respectively provided with an anhydrous hydrogen fluoride input end, a water input end, and a hydrofluoric acid output end (externally connected to a hydrofluoric acid storage tank); the anhydrous hydrogen fluoride input end is connected to an anhydrous hydrogen fluoride cooling storage tank 40 via an anhydrous hydrogen fluoride metering pump 20. Specifically, preferably, during implementation, the feeding flow rate of anhydrous hydrogen fluoride can be set to 347.6 L / h; the water input end is connected to a water storage tank 50 via a water metering pump 30. Specifically, preferably, during implementation, the feeding flow rate of the aqueous fluid can be set to 400 L / h; anhydrous hydrogen fluoride and water are mixed in the microchannels of the microchannel reactor 10.

[0024] Preferably, in order to avoid corrosion of the preparation device by hydrofluoric acid, in this embodiment, the microchannel reactor 10 adopts a silicon carbide microchannel reactor 10; and its outlet is made of fluorine-lined material; preferably, in this embodiment, the heat exchanger adopts a shell and tube heat exchanger 60, and its pipeline is made of 304 stainless steel; preferably, in this embodiment, the front of the anhydrous hydrogen fluoride metering pump 20 is made of 316L stainless steel, the flow material of its pump head is made of Monel 400 alloy, and the rear of the pump is made of 316L stainless steel and fluorine-lined material; the front of the water metering pump 300 is made of 304 stainless steel, its pump head is made of 304 stainless steel, and the rear of the pump is made of 304 stainless steel and fluorine-lined material.

[0025] Preferably, in this embodiment, the microchannel reactor 10 is also connected to a cooling water circulation loop; wherein, the cooling water circulation loop includes: a circulating water outlet connected to the microchannel reactor 10, and the circulating water outlet is connected to a heat exchanger; the cooling water output end of the heat exchanger is connected to the cooling water inlet and outlet end of the microchannel reactor 10, and the water fluid temperature is controlled at 5-10°C through the cooling water circulation loop; preferably, in this embodiment, the temperature of the hydrofluoric acid output end of the microchannel reactor 10 is <40°C.

[0026] Preferably, in this embodiment, the cooling water output end of the heat exchanger is connected to the water storage tank 50; the water storage tank 50 is connected to the cooling water inlet and outlet of the microchannel reactor 10 through a cooling water circulation pump; preferably, in this embodiment, the water storage tank 50 is connected to the room temperature soft water input pipe.

[0027] Preferably, in this embodiment, the anhydrous hydrogen fluoride metering pump 20 and the water metering pump 30 both adopt three-plunger hydraulic diaphragm pumps, and the output end of each three-plunger hydraulic diaphragm pump is connected to a pulse damper for reducing pulses and achieving balanced output of flow; further preferably, in this embodiment, the outlet of each three-plunger hydraulic diaphragm pump is provided with a flow sensor for real-time monitoring of the output flow changes of its corresponding diaphragm pump, wherein the feedback signal of the flow sensor is interlocked with the corresponding diaphragm pump motor, and the output flow is controlled by frequency conversion to adjust the motor speed.

[0028] This embodiment proposes the use of a microchannel reactor 10 as a device for preparing hydrofluoric acid, while continuously feeding the hydrofluoric acid via an anhydrous hydrogen fluoride metering pump 20 and a water metering pump 30. Since the narrow microchannel structure in the microchannel reactor 10 cuts the reaction fluid flowing therethrough, and the narrow microchannel structure has a large specific surface area, it increases the temperature gradient, thereby achieving instantaneous uniform mixing and efficient heat transfer of the reaction fluid within the micron space. This significantly improves the degree of fluid mixing, instantly removes the reaction heat, and improves the overall heat transfer efficiency, providing a safe and reliable environment for preparing hydrofluoric acid and achieving continuous preparation of hydrofluoric acid. In addition, this embodiment uses the microchannel reactor 10 as the preparation device, which greatly saves space and facilitates on-site operation and control.

[0029] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0030] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A device for continuously preparing hydrofluoric acid, characterized in that: The microchannel reactor comprises a microchannel reactor, wherein the microchannel reactor is respectively provided with an anhydrous hydrogen fluoride input end, a water input end and a hydrofluoric acid output end; The anhydrous hydrogen fluoride input end is connected to the anhydrous hydrogen fluoride cooling tank through an anhydrous hydrogen fluoride metering pump; The water input end is connected to the water storage tank via a water metering pump; Anhydrous hydrogen fluoride and water are mixed in the microchannel of the microchannel reactor.

2. The device for continuously preparing hydrofluoric acid according to claim 1, characterized in that: The microchannel reactor adopts a silicon carbide microchannel reactor; and its outlet adopts a fluorine-lined material.

3. The device for continuously preparing hydrofluoric acid according to claim 1, characterized in that: The microchannel reactor is also connected to a cooling water circulation loop; wherein, the cooling water circulation loop includes: a circulating water outlet connected to the microchannel reactor, the circulating water outlet is connected to a heat exchanger; the cooling water output end of the heat exchanger is connected to the cooling water inlet and outlet end of the microchannel reactor.

4. The device for continuously preparing hydrofluoric acid according to claim 3, wherein: The heat exchanger is a shell and tube heat exchanger, and its pipelines are made of 304 stainless steel.

5. The device for continuously preparing hydrofluoric acid according to claim 3, characterized in that: The cooling water output end of the heat exchanger is connected to a water storage tank; the water storage tank is connected to the cooling water inlet and outlet ends of the microchannel reactor through a cooling water circulation pump.

6. The device for continuously preparing hydrofluoric acid according to claim 1, wherein: The water storage tank is connected to a normal temperature soft water input pipeline.

7. The device for continuously preparing hydrofluoric acid according to claim 1, characterized in that: The anhydrous hydrogen fluoride metering pump and the water metering pump both adopt three-plunger hydraulic diaphragm pumps, and the output end of each three-plunger hydraulic diaphragm pump is connected to a pulse damper for reducing pulses and achieving balanced output of flow.

8. The device for continuously preparing hydrofluoric acid according to claim 7, characterized in that: The outlet of each three-plunger hydraulic diaphragm pump is equipped with a flow sensor for real-time monitoring of the output flow changes of its corresponding diaphragm pump. The feedback signal of the flow sensor is interlocked with the corresponding diaphragm pump motor, and the output flow is controlled by frequency conversion to adjust the motor speed.

9. The device for continuously preparing hydrofluoric acid according to claim 1, wherein: The front part of the anhydrous hydrogen fluoride metering pump is made of 316L stainless steel, the flow-through material of the pump head is made of Monel 400 alloy, and the rear part of the pump is made of 316L stainless steel and fluorine-lined material; the front part of the water metering pump is made of 304 stainless steel, the pump head is made of 304 stainless steel, and the rear part of the pump is made of 304 stainless steel and fluorine-lined material.

10. The device for continuously preparing hydrofluoric acid according to claim 1, characterized in that: The temperature of the hydrofluoric acid output end of the microchannel reactor is less than 40°C.

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