Aluminum alkoxide hydrolysis drying continuous production device

Abstract

The utility model discloses a continuous production device for hydrolyzing and drying aluminum alkoxide, which belongs to the technical field of chemical equipment and comprises a primary hydrolyzing and drying unit and a secondary hydrolyzing and drying unit. The primary hydrolysis drying unit comprises a primary hydrolysis reaction kettle, a primary belt type vacuum dryer, an anhydrous alcohol condenser and an anhydrous alcohol recovery tank; the secondary hydrolysis drying unit comprises a secondary hydrolysis reaction kettle, a secondary belt type vacuum dryer, a water-containing alcohol condenser and a water-containing alcohol recovery tank; materials discharged from the discharging end of the primary belt type vacuum dryer are conveyed to the secondary hydrolysis reaction kettle, and the bottom of the water-containing alcohol recovery tank is connected with a feeding port of the primary hydrolysis reaction kettle. Anhydrous alcohol obtained from the primary hydrolysis reaction kettle is recycled and then used as a raw material for synthesizing aluminum alkoxide, and water-containing alcohol obtained from the secondary hydrolysis reaction kettle is used as a raw material for hydrolysis reaction, so that recycling of alcohol is realized; and a belt type vacuum dryer is adopted to continuously dry mixed solutions obtained by two times of hydrolysis respectively, so that continuous hydrolysis and drying production is realized.

Description

Technical Field

[0001] The utility model relates to a continuous production device for the hydrolysis and drying of aluminum alkoxide, belonging to the technical field of chemical equipment. Background Art

[0002] High-purity ultrafine alumina has excellent properties such as high strength, high hardness, wear resistance, corrosion resistance, and high resistivity. It is widely used in sapphire crystals, laser crystals, high-pressure sodium lamps, phosphors, multi-layer integrated circuit boards and packaging materials, lithium battery diaphragm coatings, advanced ceramics and other fields. Aluminum alkoxide decomposes into aluminum hydroxide when it meets water, and aluminum oxide can be prepared after roasting. The aluminum oxide product has high purity, small grains, and excellent performance. Therefore, aluminum alkoxide hydrolysis has become the mainstream process for producing alumina. Traditional aluminum alkoxide hydrolysis equipment is mainly an intermittent operation mode, which requires a lot of manual operation. With the increasing demand for high-purity ultrafine alumina powder, the problems of operating safety, energy saving, and improving production efficiency in the aluminum alkoxide hydrolysis process have become urgent problems to be solved in equipment renewal. Utility Model Content

[0003] In order to solve the problems existing in the prior art, the utility model provides an aluminum alkoxide hydrolysis and drying continuous production device, which has reasonable device structure design, simple operation and high production efficiency.

[0004] The utility model achieves the above-mentioned purpose by adopting the following technical solutions:

[0005] A continuous production device for aluminum alkoxide hydrolysis and drying, comprising a primary hydrolysis and drying unit and a secondary hydrolysis and drying unit;

[0006] The primary hydrolysis drying unit comprises a primary hydrolysis reactor, a primary belt vacuum dryer, an anhydrous alcohol condenser, and an anhydrous alcohol recovery tank. The bottom of the primary hydrolysis reactor is connected to the feed end of the primary belt vacuum dryer through a pipeline, the exhaust port at the top of the primary belt vacuum dryer is connected to the air inlet of the anhydrous alcohol condenser, and the drain port at the bottom of the anhydrous alcohol condenser is connected to the anhydrous alcohol recovery tank.

[0007] The secondary hydrolysis drying unit comprises a secondary hydrolysis reactor, a secondary belt vacuum dryer, a hydrous alcohol condenser, and a hydrous alcohol recovery tank. The bottom of the secondary hydrolysis reactor is connected to the feed end of the secondary belt vacuum dryer through a pipeline, the exhaust port at the top of the secondary belt vacuum dryer is connected to the air inlet of the hydrous alcohol condenser, and the drain port at the bottom of the hydrous alcohol condenser is connected to the hydrous alcohol recovery tank.

[0008] The material discharged from the discharge end of the primary belt vacuum dryer is sent to the feed inlet of the secondary hydrolysis reactor, and the bottom of the aqueous alcohol recovery tank is connected to the feed inlet of the primary hydrolysis reactor.

[0009] Optionally, the aluminum alcohol salt hydrolysis and drying continuous production device provided by the utility model also includes a vacuum pump and a post-pump condenser, the inlet of the vacuum pump is connected to the air suction ports at the top of the anhydrous alcohol condenser and the top of the hydrous alcohol condenser, the outlet of the vacuum pump is connected to the air inlet of the post-pump condenser, and the top of the post-pump condenser is provided with an exhaust port and the bottom is connected to a material receiving tank.

[0010] Optionally, multiple layers of conveyor belts are arranged from top to bottom in the primary belt vacuum dryer and the secondary belt vacuum dryer, each layer of conveyor belt extends from the feeding end to the discharging end, and a heater and a cooler are arranged close to the bottom of each layer of conveyor belt.

[0011] Optionally, a stirrer is provided inside the primary hydrolysis reactor and the secondary hydrolysis reactor, and a heating jacket is provided outside the primary hydrolysis reactor and the secondary hydrolysis reactor.

[0012] Optionally, the anhydrous alcohol condenser and the hydrous alcohol condenser both adopt coil condensers, and the post-pump condenser adopts a shell-and-tube condenser; the feeding pump adopts a diaphragm pump; the outside of the anhydrous alcohol recovery tank and the hydrous alcohol recovery tank are both provided with cooling jackets; the conveyor belt is made of Teflon material.

[0013] The beneficial effects of this application include but are not limited to:

[0014] The utility model provides a continuous production device for hydrolysis and drying of aluminum alkoxide. After the aluminum alkoxide is hydrolyzed twice, a final product is obtained. The anhydrous alcohol obtained from the first hydrolysis reaction kettle is recovered as a raw material for synthesizing the aluminum alkoxide. The water-containing alcohol obtained from the second hydrolysis reaction kettle is used as a raw material for hydrolysis reaction, thereby realizing alcohol recovery and reuse. A belt vacuum dryer is used to continuously dry the mixed solutions obtained from the two hydrolysis steps respectively, thereby improving the drying rate. Thus, the hydrolysis and drying production of the aluminum alkoxide is continuously carried out, the device structure is reasonably designed, the operation is simple, and the production efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0016] Figure 1 A schematic diagram of the structure of the aluminum alkoxide hydrolysis and drying continuous production device provided by the utility model;

[0017] In the figure, 100, primary hydrolysis drying unit; 110, primary hydrolysis reactor; 120, primary belt vacuum dryer; 130, anhydrous alcohol condenser; 140, anhydrous alcohol recovery tank; 200, secondary hydrolysis drying unit; 210, secondary hydrolysis reactor; 220, secondary belt vacuum dryer; 230, aqueous alcohol condenser; 240, aqueous alcohol recovery tank; 300, feeding pump; 410, vacuum pump; 420, post-pump condenser; 430, receiving tank. DETAILED DESCRIPTION

[0018] In order to clearly illustrate the technical features of the present invention, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0019] It should be noted that many specific details are described in the following description to facilitate a full understanding of the present invention, but the present invention can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0020] like Figure 1 As shown in the figure, the aluminum alkoxide hydrolysis and drying continuous production device provided by the utility model includes a primary hydrolysis and drying unit 100 and a secondary hydrolysis and drying unit 200.

[0021] Among them, the primary hydrolysis and drying unit 100 includes a primary hydrolysis reactor 110, a primary belt vacuum dryer 120, an anhydrous alcohol condenser 130, and an anhydrous alcohol recovery tank 140. The bottom of the primary hydrolysis reactor 110 is connected to the feed end of the primary belt vacuum dryer 120 through a pipeline via a feeding pump 300, the exhaust port at the top of the primary belt vacuum dryer 120 is connected to the air inlet of the anhydrous alcohol condenser 130, and the drain port at the bottom of the anhydrous alcohol condenser 130 is connected to the anhydrous alcohol recovery tank 140.

[0022] The secondary hydrolysis drying unit 200 includes a secondary hydrolysis reactor 210, a secondary belt vacuum dryer 220, a hydrous alcohol condenser 230, and a hydrous alcohol recovery tank 240. The bottom of the secondary hydrolysis reactor 210 is connected to the feed end of the secondary belt vacuum dryer 220 through a pipeline via a feed pump 300, the exhaust port at the top of the secondary belt vacuum dryer 220 is connected to the air inlet of the hydrous alcohol condenser 230, and the drain port at the bottom of the hydrous alcohol condenser 230 is connected to the hydrous alcohol recovery tank 240.

[0023] The material discharged from the discharge end of the primary belt vacuum dryer 120 is sent to the feed inlet of the secondary hydrolysis reactor 210 , and the bottom of the aqueous alcohol recovery tank 240 is connected to the feed inlet of the primary hydrolysis reactor 110 .

[0024] Furthermore, the aluminum alkoxide hydrolysis drying continuous production device provided by the utility model also includes a vacuum pump 410 and a post-pump condenser 420, the inlet of the vacuum pump 410 is connected to the air extraction ports at the top of the anhydrous alcohol condenser 130 and the hydrous alcohol condenser 230, the outlet of the vacuum pump 410 is connected to the air inlet of the post-pump condenser 420, and the top of the post-pump condenser 420 is provided with an exhaust port and the bottom is connected to a receiving tank 430. The post-pump condenser 420 can further condense the uncondensed gas to prevent it from being discharged into the atmosphere.

[0025] The aluminum alkoxide hydrolysis and drying continuous production device provided by the utility model has the following working process:

[0026] (1) adding high-purity aluminum alkoxide to a primary hydrolysis reactor 110, and then adding a calculated amount of aqueous alcohol to carry out a hydrolysis reaction, and after the reaction is complete, obtaining an incompletely hydrolyzed primary mixed solution;

[0027] (2) starting the feed pump at the bottom of the primary hydrolysis reactor 110 to feed the primary mixed solution into the primary belt vacuum dryer 120 for drying; during the evaporative drying process, the anhydrous alcohol is vaporized under the action of the vacuum pump 410 and discharged from the top of the primary belt vacuum dryer 120 into the anhydrous alcohol condenser 130, and after condensation, the anhydrous alcohol is recovered and stored in the anhydrous alcohol recovery tank 140, and the anhydrous alcohol can be used for the synthesis reaction of alcohol salt; the material obtained after drying is discharged from the discharge end of the primary belt vacuum dryer 120 to obtain a process product;

[0028] (3) adding the process product discharged from the primary belt vacuum dryer 120 to the secondary hydrolysis reactor 210, and then adding the calculated pure water to carry out the secondary hydrolysis reaction. After the reaction is fully completed, a completely hydrolyzed secondary mixed solution is obtained;

[0029] (4) Start the feed pump at the bottom of the secondary hydrolysis reactor 210 to feed the secondary mixed solution into the secondary belt vacuum dryer 220 for drying; during the evaporative drying process, the aqueous alcohol is vaporized under the action of the vacuum pump 410 and discharged from the top of the secondary belt vacuum dryer 220 into the aqueous alcohol condenser 230, and the aqueous alcohol is recovered after condensation and stored in a recovery tank, and the aqueous alcohol is fed into the primary hydrolysis reactor 110 for primary hydrolysis of aluminum alkoxide, thereby realizing alcohol recovery and reuse; the dried material is discharged from the secondary belt vacuum dryer 220 to obtain the final product, thereby realizing continuous hydrolysis and drying production of aluminum alkoxide.

[0030] Specifically, multiple layers of conveyor belts are arranged from top to bottom in the primary belt vacuum dryer 120 and the secondary belt vacuum dryer 220. Each layer of conveyor belt extends from the feeding end to the discharging end. A heater and a cooler are arranged under each layer of conveyor belt to heat and dry the material on the conveyor belt through the heater.

[0031] Specifically, distributors are respectively provided at the feeding ends of the primary belt vacuum dryer 120 and the secondary belt vacuum dryer 220 to evenly spread the materials on the conveyor belt. The distributors may adopt conventional structures in the prior art.

[0032] Usually, the discharge ends of the primary belt vacuum dryer 120 and the secondary belt vacuum dryer 220 are connected to the storage bin through a screw conveyor and a crusher in sequence, and a pneumatic discharge butterfly valve is provided on the discharge port of the storage bin. The belt vacuum dryer can realize continuous drying of materials and improve the drying rate.

[0033] Specifically, a stirrer is provided inside the primary hydrolysis reactor 110 and the secondary hydrolysis reactor 210, and a heating jacket is provided outside the primary hydrolysis reactor 110 and the secondary hydrolysis reactor 210. Heat transfer oil is introduced into the heating jacket, and a temperature gauge and a pressure gauge are installed on the heating jacket.

[0034] Specifically, the conveyor belt is made of Teflon; the anhydrous alcohol condenser 130 and the hydrous alcohol condenser 230 both adopt coil condensers, the post-pump condenser 420 adopts a shell-and-tube condenser, and the gas phase passes through the tube bundle; the feed pump 300 adopts a diaphragm pump; the anhydrous alcohol recovery tank 140 and the hydrous alcohol recovery tank 240 are equipped with liquid level gauges, and cooling jackets are provided on the outside; the tops of the anhydrous alcohol condenser 130 and the hydrous alcohol condenser 230 are both provided with vacuum exhaust ports and air release valves.

[0035] Usually, instruments such as temperature gauges and pressure gauges are installed at various parts of the device to monitor parameters such as temperature and pressure of each part and control the hydrolysis and drying process; the material of each liquid connecting pipeline is 304 or above stainless steel.

[0036] In the present invention, unless otherwise clearly specified and limited, the terms "set", "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] The above specific implementation manner cannot be used as a limitation on the protection scope of the utility model. For technicians in this technical field, any replacement, improvement or transformation made to the implementation manner of the utility model falls within the protection scope of the utility model.

[0038] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

Claims

1. A continuous production device for hydrolysis and drying of aluminum alkoxide, characterized in that: It includes a primary hydrolysis and drying unit and a secondary hydrolysis and drying unit; The primary hydrolysis drying unit comprises a primary hydrolysis reactor, a primary belt vacuum dryer, an anhydrous alcohol condenser, and an anhydrous alcohol recovery tank. The bottom of the primary hydrolysis reactor is connected to the feed end of the primary belt vacuum dryer through a pipeline, the exhaust port at the top of the primary belt vacuum dryer is connected to the air inlet of the anhydrous alcohol condenser, and the drain port at the bottom of the anhydrous alcohol condenser is connected to the anhydrous alcohol recovery tank. The secondary hydrolysis drying unit comprises a secondary hydrolysis reactor, a secondary belt vacuum dryer, a hydrous alcohol condenser, and a hydrous alcohol recovery tank. The bottom of the secondary hydrolysis reactor is connected to the feed end of the secondary belt vacuum dryer through a pipeline, the exhaust port at the top of the secondary belt vacuum dryer is connected to the air inlet of the hydrous alcohol condenser, and the drain port at the bottom of the hydrous alcohol condenser is connected to the hydrous alcohol recovery tank. The material discharged from the discharge end of the primary belt vacuum dryer is sent to the feed inlet of the secondary hydrolysis reactor, and the bottom of the aqueous alcohol recovery tank is connected to the feed inlet of the primary hydrolysis reactor.

2. The aluminum alkoxide hydrolysis and drying continuous production device according to claim 1, characterized in that: It also includes a vacuum pump and a post-pump condenser, wherein the inlet of the vacuum pump is connected to the air suction ports at the top of the anhydrous alcohol condenser and the top of the hydrous alcohol condenser, the outlet of the vacuum pump is connected to the air inlet of the post-pump condenser, and the top of the post-pump condenser is provided with an exhaust port and the bottom is connected to a material receiving tank.

3. The aluminum alkoxide hydrolysis and drying continuous production device according to claim 1, characterized in that: The primary belt vacuum dryer and the secondary belt vacuum dryer are both provided with multiple layers of conveyor belts from top to bottom, each layer of conveyor belts extends from the feeding end to the discharging end, and a heater and a cooler are closely arranged under each layer of conveyor belts.

4. The aluminum alkoxide hydrolysis and drying continuous production device according to claim 1, characterized in that: Agitators are arranged inside the primary hydrolysis reactor and the secondary hydrolysis reactor, and heating jackets are arranged outside the primary hydrolysis reactor and the secondary hydrolysis reactor.

5. The aluminum alkoxide hydrolysis and drying continuous production device according to claim 2, characterized in that: The anhydrous alcohol condenser and the aqueous alcohol condenser are both coil-type condensers, and the post-pump condenser is a tube-in-tube condenser; the feed pump is a diaphragm pump; the anhydrous alcohol recovery tank and the aqueous alcohol recovery tank are both provided with cooling jackets on the outside; and the conveyor belt is made of Teflon material.

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