Production system for preparing magnesium dihydrogen phosphate by utilizing inositol hydrolysis residues

Abstract

The utility model relates to the technical field of inositol production, in particular to a production system for preparing magnesium dihydrogen phosphate by utilizing inositol hydrolysis residues, which comprises a hydrolysis residue storage tank, a discharge port of the hydrolysis residue storage tank is communicated with a smashing device, a discharge port of the smashing device is communicated with a reaction kettle, and a discharge port of the reaction kettle is communicated with a filtering device. A liquid outlet of the filtering device is communicated with a first buffer kettle, a discharge port of the first buffer kettle is communicated with a decolorizing kettle, a decolorizing liquid outlet of the decolorizing kettle is communicated with a second buffer kettle, a discharge port of the second buffer kettle is communicated with a crystallization kettle, a crystal outlet of the crystallization kettle is communicated with a drying device, and a discharge port of the drying device is communicated with a product storage tank. According to the production system with the structure, continuous operation can be realized, phosphate in the inositol hydrolysis residues can be recycled, resource waste is avoided, and a high-yield, high-yield and high-purity monopotassium phosphate product can be obtained.

Description

Technical Field

[0001] This utility model relates to the field of inositol production technology, and in particular to a production system for preparing magnesium dihydrogen phosphate using inositol hydrolysis residue. Background Technology

[0002] Inositol hydrolysis residue is a waste product generated during the production of inositol. Its main components include a certain amount of usable components such as phosphates. However, the comprehensive utilization of inositol hydrolysis residue is currently insufficient, and most of it is disposed of as waste, which not only wastes resources but may also put pressure on the environment.

[0003] Magnesium dihydrogen phosphate (Mg2H2PO4) has important applications in fire-retardant materials, fertilizers, and food additives. Traditional Mg2H2PO4 production methods suffer from high raw material costs, complex processes, and environmental impacts. For example, patent CN1234567A describes a production method using pure chemical reagents as raw materials. While the product has high purity, the raw material costs are high, the production process is complex, and it has a certain environmental impact. Recovering and utilizing the phosphates from inositol hydrolysis residue for the production of Mg2H2PO4 would undoubtedly increase economic benefits and provide a new source of Mg2H2PO4. Therefore, to address the aforementioned issues, it is necessary to develop a production system for preparing Mg2H2PO4 from inositol hydrolysis residue. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a production system for preparing magnesium dihydrogen phosphate using inositol hydrolysis residue, which can achieve high yield, high output and high purity of magnesium dihydrogen phosphate product, thus avoiding resource waste.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0006] A production system for preparing magnesium dihydrogen phosphate using inositol hydrolysis residue includes a hydrolysis residue storage tank, the outlet of which is connected to a pulverizing device, the outlet of which is connected to a reaction vessel, the outlet of which is connected to a filtration device, the outlet of which is connected to a first buffer vessel, the outlet of which is connected to a decolorizing vessel, the outlet of which is connected to a second buffer vessel, the outlet of which is connected to a crystallization vessel, the crystal outlet of which is connected to a drying device, and the outlet of which is connected to a product storage tank.

[0007] As an improved technical solution, the hydrolysis residue storage tank includes a tank body with an open top and a discharge port at the bottom. A rotating shaft is horizontally arranged inside the tank body, with one end of the rotating shaft connected to a motor and multiple tipping plates on the rotating shaft.

[0008] As an improved technical solution, the crushing device includes a body, with a feed inlet and a discharge outlet at the top and bottom of the body, respectively. A rotating shaft is provided inside the body, with one end of the rotating shaft connected to a motor. Multiple conical bodies are provided on the rotating shaft, and multiple crushing blades are provided on the conical bodies. A T-shaped stirring plate is provided between two adjacent crushing blades.

[0009] As an improved technical solution, the reactor includes a vessel body, with a feed inlet, a phosphoric acid inlet, and a purified water inlet at the top of the vessel body, and a discharge outlet at the bottom of the vessel body; the vessel body is provided with a jacket on the outside, and a rotating shaft is provided inside the vessel body, with one end of the rotating shaft connected to a motor, and two conical frames with symmetrical structures on the rotating shaft, each conical frame being provided with multiple first stirring components, and a second stirring component being provided between two adjacent first stirring components.

[0010] As an improved technical solution, the first stirring component is an S-shaped stirring plate, and the second stirring component is a stirring rod, which is provided with multiple spiral blades.

[0011] As an improved technical solution, the filtration device is a plate and frame filter.

[0012] As an improved technical solution, the decolorizing kettle includes a kettle body, with a feed inlet and a decolorizing agent inlet at the top of the kettle body, a decolorizing agent outlet at the bottom of the kettle body, and a decolorizing liquid outlet on one side of the lower part of the kettle body. A filter screen is provided on the inner wall of the kettle body at a position corresponding to the decolorizing liquid outlet. A stirring shaft is provided inside the kettle body, with one end of the stirring shaft connected to a motor. A first stirring frame is provided on the stirring shaft, and a second stirring frame is provided outside the first stirring frame. Multiple stirring plates are provided on the first stirring frame, and multiple stirring teeth are provided on the stirring plates. Multiple stirring rods are provided on the second stirring frame.

[0013] As an improved technical solution, the decolorizing liquid outlet is connected to the second buffer vessel via a vacuum filtration pump.

[0014] After adopting the above technical solution, the beneficial effects of this utility model are:

[0015] The production system for preparing magnesium dihydrogen phosphate using inositol hydrolysis residue includes a hydrolysis residue storage tank. The outlet of the hydrolysis residue storage tank is connected to a crushing device. The outlet of the crushing device is connected to a reaction vessel. The outlet of the reaction vessel is connected to a filtration device. The outlet of the filtration device is connected to a first buffer vessel. The outlet of the first buffer vessel is connected to a decolorizing vessel. The decolorized liquid outlet of the decolorizing vessel is connected to a second buffer vessel. The outlet of the second buffer vessel is connected to a crystallization vessel. The crystal outlet of the crystallization vessel is connected to a drying device. The outlet of the drying device is connected to a product storage tank. In actual production, the hydrolysis residue is stored in the hydrolysis residue storage tank and then conveyed to the crushing device via a conveyor belt. The crushed residue is then conveyed to the reaction vessel. Phosphoric acid is added to adjust the pH, and then purified water is added. After heating and reacting, the material containing potassium dihydrogen phosphate enters the filtration device. The filtrate after filtration enters the first buffer vessel and is then conveyed to the decolorizing vessel. The decolorized liquid after decolorization with a decolorizing agent enters the second buffer vessel and is then conveyed to the crystallization vessel. The crystals precipitated after cooling and crystallization are conveyed to the drying device and then stored in the product storage tank. The production system described above can operate continuously, recovering phosphates from the inositol hydrolysis residue, thus avoiding resource waste and producing high-yield, high-purity potassium dihydrogen phosphate.

[0016] The hydrolysis residue storage tank consists of a tank body with an open top and a discharge port at the bottom. A horizontal rotating shaft is installed inside the tank, with one end connected to a motor. Multiple tilting plates are mounted on the shaft. After the hydrolysis residue enters the tank, the motor starts, driving the rotating shaft and tilting plates to rotate, thus agitating the residue and discharging it from the discharge port. This structure effectively buffers the hydrolysis residue; furthermore, the rotating shaft and tilting plates inside the tank agitate the residue, preventing it from clumping together and affecting the discharge.

[0017] The pulverizing device comprises a main body with an inlet at the top and an outlet at the bottom. Inside the main body is a rotating shaft, one end of which is connected to a motor. Multiple conical bodies are mounted on the shaft, each with a pulverizing blade. A T-shaped stirring plate is positioned between adjacent blades. When the hydrolysis residue enters the main body, the motor starts, driving the shaft and conical bodies to rotate. The T-shaped stirring plate agitates the residue, ensuring thorough contact between the pulverizing blades and the residue, thus pulverizing it. This pulverizing device is rationally designed and effectively pulverizes the hydrolysis residue, facilitating subsequent reactions.

[0018] The reactor comprises a vessel body with a feed inlet, a phosphoric acid inlet, and a purified water inlet at the top, and a discharge outlet at the bottom. The vessel body is externally jacketed, and internally contains a rotating shaft. One end of the shaft is connected to a motor, and the shaft has two symmetrically arranged conical frames. Each conical frame has multiple first stirring components, with a second stirring component positioned between adjacent first stirring components. The pulverized hydrolyzed residue enters the vessel body, phosphoric acid is added to adjust the pH, followed by purified water. The motor is then started, and the two conical frames, along with the first and second stirring components, work together to mix the reaction mixture. The heat transfer medium in the jacket provides the necessary temperature for the reaction, promoting the formation of magnesium dihydrogen phosphate. This reactor structure is rationally designed, significantly improving reaction efficiency and promoting the formation of magnesium dihydrogen phosphate.

[0019] The first stirring component is an S-shaped stirring plate, and the second stirring component is a stirring rod with multiple spiral blades. The combination of the S-shaped stirring plate, stirring rod, and spiral blades increases the stirring range and promotes full contact and reaction of the materials.

[0020] The filtration device is a plate and frame filter press. This facilitates the effective separation of slag and liquid materials.

[0021] The decolorizing kettle comprises a kettle body with a feed inlet and a decolorizing agent inlet at the top, a decolorizing agent outlet at the bottom, and a decolorizing liquid outlet on one side of the lower part of the kettle body. A filter screen is installed on the inner wall of the kettle body corresponding to the decolorizing liquid outlet. Inside the kettle body is a stirring shaft, one end of which is connected to a motor. A first stirring frame is mounted on the stirring shaft, and a second stirring frame is mounted outside the first stirring frame. The first stirring frame has multiple stirring plates with multiple stirring teeth; the second stirring frame has multiple stirring rods. The filtrate enters the decolorizing kettle, and then the decolorizing agent (activated carbon) is added. After the motor starts, it drives the first stirring frame, stirring plates and stirring teeth, and the second stirring frame and stirring rods to stir and mix the filtrate and decolorizing agent. The heat transfer medium in the jacket provides the temperature required for decolorization. After decolorization, the decolorizing liquid is discharged from the decolorizing liquid outlet, and the decolorizing agent is discharged from the decolorizing agent outlet. This decolorizing kettle structure ensures uniform heating of the liquid and full contact between the decolorizing agent and the liquid, greatly improving decolorization efficiency and effect.

[0022] The decolorizing liquor outlet is connected to the second buffer vessel via a vacuum pump. The vacuum pump facilitates the delivery of the decolorizing liquor into the second buffer vessel. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the production system for preparing magnesium dihydrogen phosphate using inositol hydrolysis residue according to this utility model.

[0024] Among them, 1-hydrolysis residue storage tank, 2-crushing device, 20-conical body, 21-crushing blade, 22-T-shaped stirring plate, 3-reaction vessel, 30-conical frame, 31-first stirring component, 32-second stirring component, 33-spiral blade, 4-filtration device, 5-first buffer vessel, 6-decolorization vessel, 60-decolorization liquid outlet, 61-filter screen, 62-first stirring frame, 620-stirring plate, 621-stirring teeth, 63-second stirring frame, 630-stirring rod, 7, 12-vacuum pump, 8-second buffer vessel, 9-crystallization vessel, 10-drying device, 11-product storage tank. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0026] A production system for preparing magnesium dihydrogen phosphate using inositol hydrolysis residue, such as Figure 1 As shown, the system includes a hydrolysis residue storage tank 1, the outlet of which is connected to a crushing device 2, the outlet of which is connected to a reaction vessel 3, the outlet of which is connected to a filtration device 4 (plate and frame filter), the outlet of which is connected to a first buffer vessel 5, the outlet of which is connected to a decolorizing vessel 6, the outlet of which is connected to a second buffer vessel 8 via a vacuum pump 7, the outlet of which is connected to a crystallization vessel 9 (the crystallization mother liquor passes through the filter screen at the crystallization mother liquor outlet and is extracted by a vacuum pump), the crystal outlet of which is connected to a drying device 10 (double cone dryer), and the outlet of which is connected to a product storage tank 11.

[0027] In actual production, the hydrolysis residue is stored in a hydrolysis residue storage tank, then conveyed to the inside of a crushing device via a conveyor belt. The crushed residue is then conveyed to the inside of a reaction vessel, where phosphoric acid is added to adjust the pH, followed by purified water. After heating and reaction, the material containing potassium dihydrogen phosphate enters a filtration device. The filtrate then enters a first buffer vessel, and is then pumped to a decolorizing vessel. After decolorization with a decolorizing agent, the decolorized liquid enters a second buffer vessel, and is then pumped to a crystallization vessel. The coolant in the crystallization vessel jacket provides the necessary temperature for crystallization, and the mixture is stirred by a stirring component inside the crystallization vessel. The precipitated crystals are then conveyed to a drying device via a conveyor belt, and finally stored in a product storage tank. This production system can operate continuously, recovering phosphate from the inositol hydrolysis residue to obtain high-yield, high-purity potassium dihydrogen phosphate.

[0028] The hydrolysis residue storage tank 1 includes a tank body with an open top and a discharge port at the bottom. A horizontal rotating shaft is installed inside the tank body, with one end connected to a motor. Multiple tilting plates are mounted on the shaft. After the hydrolysis residue enters the tank body, the motor starts, driving the rotating shaft and tilting plates to rotate, thus agitating the residue and discharging it from the discharge port. This structure of the hydrolysis residue storage tank effectively buffers the hydrolysis residue; furthermore, the rotating shaft and tilting plates inside the tank body agitate the residue, preventing it from clumping together and affecting the discharge.

[0029] The pulverizing device 2 includes a main body with an inlet at the top and an outlet at the bottom. Inside the main body is a rotating shaft, one end of which is connected to a motor. Multiple conical bodies 20 are mounted on the shaft, each with multiple pulverizing blades 21. A T-shaped stirring plate 22 is positioned between adjacent blades 21. Hydrolysis residue enters the main body. Upon starting the motor, the rotating shaft and conical bodies rotate. The T-shaped stirring plate stirs the hydrolysis residue, bringing it into contact with the components of the pulverizing blades, thus pulverizing the hydrolysis residue.

[0030] The reactor 3 includes a vessel body with a feed inlet, a phosphoric acid inlet, and a purified water inlet at the top, and a discharge outlet at the bottom. The vessel body is fitted with a jacket, and a rotating shaft is located inside. One end of the shaft is connected to a motor, and two symmetrically arranged conical frames 30 are mounted on the shaft. Each conical frame has multiple first stirring components 31, and a second stirring component 32 is positioned between adjacent first stirring components. The pulverized hydrolyzed residue enters the vessel body, phosphoric acid is added to adjust the pH, and then purified water is added. The motor is started, and the two conical frames, along with the first and second stirring components, work together to stir and mix the liquid. The heat transfer medium in the jacket provides the necessary temperature for the reaction, promoting the formation of magnesium dihydrogen phosphate.

[0031] The first stirring component 31 is an S-shaped stirring plate, and the second stirring component 32 is a stirring rod with multiple spiral blades 33. The combination of the S-shaped stirring plate, stirring rod, and spiral blades increases the stirring range and promotes full contact and reaction of the materials.

[0032] The decolorizing kettle 6 includes a kettle body with a feed inlet and a decolorizing agent inlet at the top, a decolorizing agent outlet at the bottom, and a decolorizing liquid outlet 60 on one side of the lower part of the kettle body. A filter screen 61 is installed on the inner wall of the kettle body corresponding to the decolorizing liquid outlet. An agitator shaft is installed inside the kettle body, with one end connected to a motor. A first agitator frame 62 is installed on the agitator shaft, and a second agitator frame 63 is installed outside the first agitator frame 62. Multiple agitator plates 620 and multiple agitator teeth 621 are installed on the first agitator frame 620. Multiple agitator rods 630 are installed on the second agitator frame 630. The filtrate enters the decolorizing kettle, and a decolorizing agent (activated carbon) is added. After the motor starts, it drives the first agitator frame, agitator plates and agitator teeth, and the second agitator frame and agitator rods to stir and mix the filtrate and decolorizing agent. The heat medium in the jacket provides the temperature required for decolorization. After the decolorization process is completed, the decolorizing liquid is discharged from the decolorizing liquid outlet, and the decolorizing agent is discharged from the decolorizing agent outlet.

[0033] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A production system for preparing magnesium dihydrogen phosphate using inositol hydrolysis residue, characterized in that, The system includes a hydrolysis residue storage tank, the outlet of which is connected to a crushing device, the outlet of which is connected to a reaction vessel, the outlet of which is connected to a filtration device, the outlet of which is connected to a first buffer vessel, the outlet of which is connected to a decolorizing vessel, the outlet of which is connected to a second buffer vessel, the outlet of which is connected to a crystallization vessel, the crystal outlet of which is connected to a drying device, and the outlet of which is connected to a product storage tank.

2. The production system for preparing magnesium dihydrogen phosphate using inositol hydrolysis residue according to claim 1, characterized in that, The hydrolysis residue storage tank includes a tank body with an open top and a discharge port at the bottom. A rotating shaft is horizontally arranged inside the tank body, with one end of the rotating shaft connected to a motor and multiple tipping plates on the rotating shaft.

3. The production system for preparing magnesium dihydrogen phosphate using inositol hydrolysis residue according to claim 1, characterized in that, The crushing device includes a body, with an inlet and an outlet at the top and bottom of the body, respectively. The body has a rotating shaft inside, one end of which is connected to a motor. The rotating shaft has multiple conical bodies, and each conical body has multiple crushing blades.

4. The production system for preparing magnesium dihydrogen phosphate using inositol hydrolysis residue according to claim 1, characterized in that, The reactor includes a vessel body, with a feed inlet, a phosphoric acid inlet, and a purified water inlet at the top of the vessel body, and a discharge outlet at the bottom of the vessel body; the vessel body is equipped with a jacket on the outside, and a rotating shaft is provided inside the vessel body, with one end of the rotating shaft connected to a motor, and two conical frames with symmetrical structures on the rotating shaft, each conical frame being provided with multiple first stirring components, and a second stirring component being provided between two adjacent first stirring components.

5. A production system for preparing magnesium dihydrogen phosphate using inositol hydrolysis residue according to claim 4, characterized in that, The first stirring component is an S-shaped stirring plate, and the second stirring component is a stirring rod with multiple spiral blades.

6. A production system for preparing magnesium dihydrogen phosphate using inositol hydrolysis residue according to claim 1, characterized in that, The filtration device is a plate and frame filter.

7. A production system for preparing magnesium dihydrogen phosphate using inositol hydrolysis residue according to claim 1, characterized in that, The decolorizing kettle includes a kettle body, with a feed inlet and a decolorizing agent inlet at the top, a decolorizing agent outlet at the bottom, and a decolorizing liquid outlet on one side of the lower part of the kettle body. A filter screen is provided on the inner wall of the kettle body at a position corresponding to the decolorizing liquid outlet. A stirring shaft is provided inside the kettle body, with one end of the stirring shaft connected to a motor. A first stirring frame is provided on the stirring shaft, and a second stirring frame is provided outside the first stirring frame. Multiple stirring plates are provided on the first stirring frame, and multiple stirring teeth are provided on the stirring plates. Multiple stirring rods are provided on the second stirring frame.

8. A production system for preparing magnesium dihydrogen phosphate using inositol hydrolysis residue according to claim 7, characterized in that, The decolorizing liquid outlet is connected to the second buffer vessel via a vacuum filtration pump.

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