A method for continuous purification of acidified TiO2 sol
By repeatedly rinsing the acidified TiO2 sol semi-finished product with pure water and conveying it through a continuous purification device, the problems of high equipment investment and low purification efficiency in the existing technology are solved, and efficient and low-cost purification of acidified TiO2 sol is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- ZHEJIANG HARMONY PHOTOCATALYSIS TECH CO LTD
- Filing Date
- 2023-06-19
- Publication Date
- 2026-07-31
AI Technical Summary
In existing technologies, continuous membrane separation requires large equipment investment and is difficult to control, while intermittent bag membrane separation is inefficient and produces poor product performance, resulting in high costs and poor practicality for titanium dioxide sol purification.
The acidified TiO2 sol semi-finished product is rinsed multiple times with pure water, and then transported and filtered through a continuous purification device. Combined with centrifugal separation and high-temperature distillation, the acidified TiO2 sol is continuously purified.
It reduced equipment costs, improved the production efficiency and purification effect of acidified TiO2 sol, and achieved continuous purification of acidified TiO2 sol.
Smart Images
Figure CN116789170B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the technical field of purification of acidified TiO2 sol, and in particular to a continuous purification method for acidified TiO2 sol. Background Technology
[0002] Titanium dioxide sol is a liquid solution containing titanium dioxide (TiO2) particles. It is usually composed of a titanium source and a solvent and is prepared through appropriate treatment. Preparation methods of titanium dioxide sol include a nano-scale titanium dioxide sol and its preparation method and a method for removing formaldehyde disclosed in the invention patent with authorization announcement number CN103613129B, and a neutral, stable and transparent photocatalytic titanium dioxide sol disclosed in the invention patent with authorization announcement number CN104010724B. All of these methods improve the quality of titanium dioxide sol during the preparation process.
[0003] In the preparation of titanium dioxide sol, purification is generally carried out using two methods: continuous membrane separation (similar to a pure water production device) or intermittent bag membrane separation (the sol is packaged in a bag similar in appearance to a regular plastic bag and suspended in water). However, it has been found that while continuous membrane separation can efficiently purify titanium dioxide sol, it requires a large investment in equipment and is difficult to control during the purification process, resulting in high costs. Intermittent bag membrane separation, although requiring less investment in equipment, has lower purification efficiency and the differences in product performance between bags are difficult to eliminate, leading to poor practicality. Therefore, there is an urgent need for a continuous purification method for acidified TiO2 sol to improve the above problems. Summary of the Invention
[0004] To solve the above-mentioned technical problems, the present invention provides a method for continuous purification of acidified TiO2 sol by using purified water to rinse the semi-finished product of acidified TiO2 sol multiple times during the transportation process, thereby reducing the cost of purification equipment and realizing continuous purification of acidified TiO2 sol, thus improving the production efficiency of acidified TiO2 sol.
[0005] The present invention provides a method for continuous purification of acidified TiO2 sol, comprising the following steps: S1. Material preparation Prepare a semi-finished product of acidified TiO2 sol and a large amount of purified water, and encapsulate the purified water; S2, Precipitation The semi-finished product of acidified TiO2 sol was allowed to stand and precipitate in an environment of 20°C-30°C to separate the particulate matter from the solution. S3, Filtering The semi-finished product of acidified TiO2 sol is separated and filtered by centrifugation to separate the solution, acidified TiO2 sol and large particulate impurities. S4, Purification The semi-finished product of acidified TiO2 sol and purified water are discharged into a continuous purification device. The semi-finished product of acidified TiO2 sol is transported through the continuous purification device, while the semi-finished product of acidified TiO2 sol is rinsed multiple times with purified water to separate the free acid, alcohol and soluble organic matter from the acidified TiO2 sol. Then the wastewater containing free acid, alcohol and soluble organic matter is discharged, and the purified acidified TiO2 sol and the discharged wastewater are purified. S5, Drying The container containing the acidified TiO2 sol is evacuated, and the inside of the container is heated by a heater to remove excess moisture from the acidified TiO2 sol.
[0006] Preferably, the continuous purification device in the S4 purification includes a rinsing mechanism and a guiding mechanism, with the guiding mechanism mounted on the rinsing mechanism; The guiding mechanism continuously conveys the semi-finished product of acidified TiO2 sol, and the rinsing mechanism rinses the semi-finished product of acidified TiO2 sol during the conveying process; the guiding mechanism conveys the semi-finished product of acidified TiO2 sol, and the rinsing mechanism rinses the semi-finished product of acidified TiO2 sol in the guiding mechanism.
[0007] Preferably, the rinsing mechanism includes a purification tank, multiple sets of inlet pipes, and multiple sets of outlet pipes. The purification tank contains multiple water tanks. The inlet and outlet pipes are installed at the front and rear ends of the purification tank, respectively, and are connected to the interior of the water tanks. Each inlet and outlet pipe is equipped with a control valve. The axes of the inlet pipes are parallel to the axis of the guide mechanism, while the axes of the outlet pipes are higher than the axis of the guide mechanism. The outlets of the inlet pipes are perpendicular to the guide mechanism. Pure water is discharged into the water tanks within the purification tank through the inlet pipes, while maintaining the water level in the tanks above the guide mechanism. This allows for multiple vertical rinsings of the acidified TiO2 sol semi-finished product within the guide mechanism. The drainage volume of each inlet pipe is controlled by the control valves on each inlet pipe. Finally, the wastewater in the water tanks is discharged through the outlet pipes, thereby improving the practicality of the continuous purification device.
[0008] Preferably, the guiding mechanism includes a driving mechanism, a bag tube, a first guide tube, multiple sets of second guide tubes, and a discharge pipe. The multiple sets of second guide tubes are all fitted onto the bag tube and rotatably mounted on the purification box. One end of the bag tube extends from the left end of the purification box, and the other end extends from the other end of the purification box. Multiple sets of reinforcing ribs are provided on the surface of the bag tube. One end of the first guide tube is rotatably mounted on one end of the bag tube, and one end of the discharge pipe is fixedly mounted on the other end of the bag tube. The semi-finished product of the acidified TiO2 sol is discharged into the first guide tube, which guides the semi-finished product of the acidified TiO2 sol, causing it to rotate into the bag tube. The bag tube then conveys the rotating semi-finished product of the acidified TiO2 sol. Then, the semi-finished product of acidified TiO2 sol in the bag tube is guided again by multiple sets of second guide tubes, so that the semi-finished product of acidified TiO2 sol continues to rotate, which facilitates multiple all-round rinsing of the semi-finished product of acidified TiO2 sol with pure water. Then, the purified acidified TiO2 sol is discharged through the discharge pipe. Because the other end of the discharge pipe has a smaller diameter, the acidified TiO2 sol near the discharge pipe is squeezed, squeezing out some of the water in the acidified TiO2 sol. Then, the purified acidified TiO2 sol is discharged through the discharge pipe. When cleaning the inside of the bag tube, the drive mechanism drives the bag tube to rotate, which facilitates the rinsing of the bag tube with pure water and washes away the residue on the inner wall of the bag tube, thereby improving the practicality of the continuous purification device.
[0009] Preferably, the driving mechanism includes a drive motor, a gear, and a gear ring. The drive motor is fixedly mounted on the purification box, the gear is mounted on the output shaft of the drive motor, and the gear ring is fitted onto the bag tube, with the gear and gear ring being meshed. When the drive motor is turned on, the bag tube is driven to rotate through the meshing transmission of the gear and gear ring, which facilitates rinsing of the inner wall of the bag tube with pure water, thereby improving the practicality of the continuous purification device.
[0010] Preferably, the operation method of the continuous purification device includes: S1. Adjust the length of the bag tube, the number of water tanks in the purification box, the drainage volume of multiple sets of water inlet pipes and multiple sets of water outlet pipes, and the conveying speed of the semi-finished product of acidified TiO2 sol in the bag tube to a suitable level. S2. The semi-finished product of acidified TiO2 sol is continuously pumped into the first guide tube by a water pump. The first guide tube guides the semi-finished product of acidified TiO2 sol, causing it to rotate into the bag tube. The bag tube then transports the rotating semi-finished product of acidified TiO2 sol. Afterwards, multiple sets of second guide tubes guide the semi-finished product of acidified TiO2 sol in the bag tube again, causing it to continue rotating. S3. Pure water is discharged into multiple water tanks in the purification box through multiple sets of water inlet pipes, while keeping the water level in the multiple water tanks higher than the bag tube. The semi-finished product of acidified TiO2 sol in the bag tube is vertically rinsed multiple times. The drainage volume of each water inlet pipe is controlled by the control valve on each water inlet pipe. Then, the sewage in the multiple water tanks is discharged through multiple sets of drain pipes. S4. Because the other end of the discharge pipe has a smaller diameter, the acidified TiO2 sol near the discharge pipe is squeezed, squeezing out some of the water in the acidified TiO2 sol. Then the purified acidified TiO2 sol is discharged through the discharge pipe. S5. When cleaning the inside of the bag tube, turn on the drive motor. Through the meshing of the gear and the gear ring, the bag tube is driven to rotate, so that multiple sets of water inlet pipes spray pure water onto the bag tube to rinse the inner wall of the bag tube. Then the wastewater is discharged through the discharge pipe.
[0011] Preferably, the wastewater is treated by high-temperature distillation in the S4 purification process.
[0012] Preferably, in the S5 drying process, the acidified TiO2 sol is dried by heating air to 50°C-60°C.
[0013] Preferably, the purified water used in the S4 purification process is at a temperature of 35°C-40°C, so that soluble organic matter can be quickly dissolved in the purified water by using hot water.
[0014] Preferably, the water used for the first rinse of the acidified TiO2 sol semi-finished product in the bag tube in the purification box is the water discharged after the last rinse of the acidified TiO2 sol semi-finished product in the bag tube in the purification box, and all rinsings except the first rinse use purified water.
[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. By continuously conveying the semi-finished product of acidified TiO2 sol and vertically rinsing it multiple times with pure water during the conveying process, the acidified TiO2 sol is purified, thereby improving the production efficiency of acidified TiO2 sol and reducing equipment costs. 2. Rinse the semi-finished product of acidified TiO2 sol with heated purified water to facilitate the rapid dissolution of water-soluble organic matter into the water; 3. During the conveying process, the semi-finished product of acidified TiO2 sol is guided to rotate, which facilitates the all-round rinsing of the semi-finished product of acidified TiO2 sol with pure water. Attached Figure Description
[0016] Figure 1 This is an isometric structural schematic diagram of the continuous purification device of the present invention; Figure 2 This is a schematic diagram of the purification process of the present invention; Figure 3 This is a top view of the continuous purification apparatus of the present invention; Figure 4 This is a schematic diagram of the operation method of the continuous purification device of the present invention; Figure 5 This is a schematic diagram of the pure water treatment process of the present invention; Figure 6 This is a schematic diagram of the rinsing process for the semi-finished product of acidified TiO2 sol according to the present invention; The following are labels in the attached diagram: 1. Purification box; 2. Water inlet pipe; 3. Drain pipe; 4. Water tank; 5. Bag pipe; 6. First guide pipe; 7. Second guide pipe; 8. Discharge pipe; 9. Drive motor; 10. Gear; 11. Gear ring; 12. Reinforcing rib. Detailed Implementation
[0017] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. Example
[0018] like Figures 1 to 6 As shown, it includes the following steps: S1. Material preparation Prepare a semi-finished product of acidified TiO2 sol and a large amount of purified water, and encapsulate the purified water; S2, Precipitation The semi-finished product of acidified TiO2 sol was allowed to stand and precipitate in an environment of 20°C-30°C to separate the particulate matter from the solution. S3, Filtering The semi-finished product of acidified TiO2 sol is separated and filtered by centrifugation to separate the solution, acidified TiO2 sol and large particulate impurities. S4, Purification The semi-finished product of acidified TiO2 sol and purified water are discharged into a continuous purification device. The semi-finished product of acidified TiO2 sol is transported through the continuous purification device, while the semi-finished product of acidified TiO2 sol is rinsed multiple times with purified water to separate the free acid, alcohol and soluble organic matter from the acidified TiO2 sol. Then the wastewater containing free acid, alcohol and soluble organic matter is discharged, and the purified acidified TiO2 sol and the discharged wastewater are purified. S5, Drying The container containing the acidified TiO2 sol is evacuated, and the inside of the container is heated by a heater to remove excess moisture from the acidified TiO2 sol. The continuous purification device in the S4 purification includes a rinsing mechanism and a guiding mechanism, with the guiding mechanism mounted on the rinsing mechanism; The guiding mechanism continuously conveys the semi-finished product of acidified TiO2 sol, and the rinsing mechanism rinses the semi-finished product of acidified TiO2 sol during the conveying process. The rinsing mechanism includes a purification tank 1, multiple sets of water inlet pipes 2 and multiple sets of drain pipes 3. The purification tank 1 is equipped with multiple sets of water tanks 4. The multiple sets of water inlet pipes 2 and multiple sets of drain pipes 3 are respectively installed at the front and rear ends of the purification tank 1. The multiple sets of water inlet pipes 2 and multiple sets of drain pipes 3 are respectively connected to the interior of the multiple sets of water tanks 4. Each set of water inlet pipes 2 and multiple sets of drain pipes 3 is equipped with a control valve. The axis of each set of water inlet pipes 2 is parallel to the axis of the guide mechanism, the axis of each set of drain pipes 3 is higher than the axis of the guide mechanism, and the drain outlet of each set of water inlet pipes 2 is perpendicular to the guide mechanism. The guiding mechanism includes a driving mechanism, a bag tube 5, a first guide tube 6, multiple sets of second guide tubes 7, and a discharge tube 8. The multiple sets of second guide tubes 7 are all fitted onto the bag tube 5 and are rotatably mounted on the purification box 1. One end of the bag tube 5 extends from the left end of the purification box 1, and the other end of the bag tube 5 extends from the other end of the purification box 1. Multiple sets of reinforcing ribs 12 are provided on the surface of the bag tube 5. One end of the first guide tube 6 is rotatably mounted on one end of the bag tube 5, and one end of the discharge tube 8 is fixedly mounted on the other end of the bag tube 5. The drive mechanism includes a drive motor 9, a gear 10, and a gear ring 11. The drive motor 9 is fixedly installed on the purification box 1, the gear 10 is installed on the output shaft of the drive motor 9, and the gear ring 11 is fitted onto the bag tube 5. The gear 10 and the gear ring 11 are meshed together. The operation method of the continuous purification device includes: S1. Adjust the length of the bag tube 5, the number of water tanks 4 in the purification box 1, the drainage volume of multiple sets of water inlet pipes 2 and multiple sets of water outlet pipes 3, and the conveying speed of the semi-finished product of acidified TiO2 sol in the bag tube 5 to a suitable level. S2. The semi-finished product of acidified TiO2 sol is continuously pumped into the first guide tube 6 by a water pump. The semi-finished product of acidified TiO2 sol is guided by the first guide tube 6, so that the semi-finished product of acidified TiO2 sol rotates into the bag tube 5. The bag tube 5 conveys the rotating semi-finished product of acidified TiO2 sol. Then, the semi-finished product of acidified TiO2 sol in the bag tube 5 is guided again by multiple sets of second guide tubes 7, so that the semi-finished product of acidified TiO2 sol continues to rotate. S3. Pure water is discharged into multiple water tanks 4 in the purification box 1 through multiple sets of water inlet pipes 2, while keeping the water level in the multiple sets of water tanks 4 higher than that in the bag tube 5. The semi-finished product of acidified TiO2 sol in the bag tube 5 is vertically rinsed multiple times, and the drainage volume of each water inlet pipe 2 is controlled by the control valve on each water inlet pipe 2. Then, the sewage in the multiple sets of water tanks 4 is discharged through multiple sets of drain pipes 3. S4. Because the other end of the discharge pipe 8 has a smaller diameter, the acidified TiO2 sol near the discharge pipe 8 is squeezed, squeezing out some of the water in the acidified TiO2 sol, and then the purified acidified TiO2 sol is discharged through the discharge pipe 8. S5. When cleaning the inside of the bag tube 5, turn on the drive motor 9, and drive the bag tube 5 to rotate through the meshing of the gear 10 and the gear ring 11, so that multiple sets of water inlet pipes 2 spray pure water onto the bag tube 5 to rinse the inner wall of the bag tube 5, and then discharge the sewage through the discharge pipe 8. The wastewater is treated by high-temperature distillation in the S4 purification process. In the S5 drying process, air is heated to 50°C-60°C to dry the acidified TiO2 sol; The purified water used in the S4 purification process is at a temperature of 35°C-40°C. Hot water is used to facilitate the rapid dissolution of soluble organic matter into the purified water. The water used for the first rinse of the acidified TiO2 sol semi-finished product in the bag tube 5 in the purification box 1 is the water discharged after the last rinse of the acidified TiO2 sol semi-finished product in the bag tube 5 in the purification box 1, and all rinsing except the first rinse uses pure water.
[0019] The main functions achieved by this invention are: continuous purification of acidified TiO2 sol, increasing the purification speed of acidified TiO2 sol, and improving the purification effect of acidified TiO2 sol; 1. Continuous purification of acidified TiO2 sol: The semi-finished product of acidified TiO2 sol is continuously conveyed by the guiding mechanism, and the semi-finished product of acidified TiO2 sol is vertically rinsed multiple times with pure water to achieve continuous purification of acidified TiO2 sol. 2. Improve the purification speed of acidified TiO2 sol: Rinse the semi-finished product of acidified TiO2 sol with hot water to allow water-soluble organic matter to dissolve quickly into the water; 3. Improve the purification effect of acidified TiO2 sol: By guiding the semi-finished product of acidified TiO2 sol to rotate, the semi-finished product of acidified TiO2 sol is rinsed in all directions with pure water.
[0020] The drive motor 9 of the continuous purification method for acidified TiO2 sol of the present invention is commercially available. Technical personnel in this industry only need to install and operate it according to the accompanying instruction manual, without requiring any creative work from those skilled in the art.
[0021] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.
Claims
1. A method for continuous purification of acidified TiO2 sol, characterized in that, Includes the following steps: S1. Material preparation Prepare the semi-finished product of acidified TiO2 sol and purified water, and encapsulate the purified water; S2, Precipitation The semi-finished product of acidified TiO2 sol was allowed to stand and precipitate in an environment of 20°C-30°C to separate the particulate matter from the solution. S3, Filtering The semi-finished product of acidified TiO2 sol is separated and filtered by centrifugation to separate the solution, acidified TiO2 sol and large particulate impurities. S4, Purification The semi-finished product of acidified TiO2 sol and purified water are discharged into a continuous purification device. The semi-finished product of acidified TiO2 sol is transported through the continuous purification device, while the semi-finished product of acidified TiO2 sol is rinsed multiple times with purified water to separate the free acid, alcohol and soluble organic matter from the acidified TiO2 sol. Then, the wastewater containing free acid, alcohol and soluble organic matter is discharged, and the purified acidified TiO2 sol is discharged. The discharged wastewater is also purified. S5, Drying The container containing the acidified TiO2 sol is evacuated, and the inside of the container is heated by a heater to remove excess moisture from the acidified TiO2 sol. The continuous purification device in the S4 purification includes a rinsing mechanism and a guiding mechanism, with the guiding mechanism mounted on the rinsing mechanism; The guiding mechanism continuously conveys the semi-finished product of acidified TiO2 sol, and the rinsing mechanism rinses the semi-finished product of acidified TiO2 sol during the conveying process. The rinsing mechanism includes a purification box (1), multiple sets of water inlet pipes (2) and multiple sets of drain pipes (3). The purification box (1) is equipped with multiple sets of water tanks (4). The multiple sets of water inlet pipes (2) and multiple sets of drain pipes (3) are respectively installed at the front and rear ends of the purification box (1). The multiple sets of water inlet pipes (2) and multiple sets of drain pipes (3) are respectively connected to the interior of the multiple sets of water tanks (4). The multiple sets of water inlet pipes (2) and multiple sets of drain pipes (3) are each equipped with a control valve. The drain outlets of the multiple sets of water inlet pipes (2) are perpendicular to the guide mechanism. The guiding mechanism includes a driving mechanism, a bag tube (5), a first guide tube (6), multiple sets of second guide tubes (7) and a discharge tube (8). Multiple sets of second guide tubes (7) are all fitted onto the bag tube (5). Multiple sets of second guide tubes (7) are rotatably mounted on the purification box (1). One end of the bag tube (5) extends from the left end of the purification box (1), and the other end of the bag tube (5) extends from the other end of the purification box (1). Multiple sets of reinforcing ribs (12) are provided on the surface of the bag tube (5). One end of the first guide tube (6) is rotatably mounted on one end of the bag tube (5), and one end of the discharge tube (8) is fixedly mounted on the other end of the bag tube (5).
2. The continuous purification method for acidified TiO2 sol as described in claim 1, characterized in that, The drive mechanism includes a drive motor (9), a gear (10) and a gear ring (11). The drive motor (9) is fixedly installed on the purification box (1), the gear (10) is installed on the output shaft of the drive motor (9), and the gear ring (11) is fitted on the bag tube (5). The gear (10) and the gear ring (11) are meshed.
3. The continuous purification method for acidified TiO2 sol as described in claim 2, characterized in that, The operation method of the continuous purification device includes: A1. Adjust the length of the bag tube (5), the number of water tanks (4) in the purification box (1), the drainage volume of multiple sets of water inlet pipes (2) and multiple sets of drain pipes (3), and the conveying speed of the semi-finished product of acidified TiO2 sol in the bag tube (5) to a suitable level. A2. The semi-finished product of acidified TiO2 sol is continuously pumped into the first guide tube (6) by a water pump. The semi-finished product of acidified TiO2 sol is guided by the first guide tube (6) so that the semi-finished product of acidified TiO2 sol rotates into the bag tube (5). The bag tube (5) transports the rotating semi-finished product of acidified TiO2 sol. Then, the semi-finished product of acidified TiO2 sol in the bag tube (5) is guided again by multiple sets of second guide tubes (7) so that the semi-finished product of acidified TiO2 sol continues to rotate. A3. Through multiple sets of water inlet pipes (2), pure water is discharged into multiple sets of water tanks (4) in the purification tank (1), while keeping the water level in the multiple sets of water tanks (4) higher than that in the bag tube (5). The semi-finished product of acidified TiO2 sol in the bag tube (5) is vertically rinsed multiple times, and the drainage volume of each water inlet pipe (2) is controlled by the control valve on each water inlet pipe (2). Then, the sewage in the multiple sets of water tanks (4) is discharged through multiple sets of drain pipes (3). A4. Because the other end of the discharge pipe (8) has a smaller diameter, the acidified TiO2 sol near the discharge pipe (8) is squeezed, squeezing out some of the water in the acidified TiO2 sol, and then the purified acidified TiO2 sol is discharged through the discharge pipe (8). A5. When cleaning the inside of the bag tube (5), turn on the drive motor (9), and drive the bag tube (5) to rotate through the meshing transmission of the gear (10) and the gear ring (11), so that multiple sets of water inlet pipes (2) spray pure water onto the bag tube (5) to rinse the inner wall of the bag tube (5), and then discharge the sewage through the discharge pipe (8).
4. The continuous purification method for acidified TiO2 sol as described in claim 1, characterized in that, The S4 purification process uses high-temperature distillation to treat wastewater.
5. The continuous purification method for acidified TiO2 sol as described in claim 1, characterized in that, The purified water used in the S4 purification process is at a temperature of 35°C-40°C, which allows soluble organic matter to dissolve quickly into the purified water using hot water.
6. The continuous purification method for acidified TiO2 sol as described in claim 3, characterized in that, The water used for the first rinse of the acidified TiO2 sol semi-finished product in the bag tube (5) in the purification box (1) is the water discharged after the last rinse of the acidified TiO2 sol semi-finished product in the bag tube (5) in the purification box (1), and all rinsing except the first rinse uses pure water.