Method for rapidly drying wet sodium percarbonate product

Abstract

The invention provides a method for quickly drying a wet sodium percarbonate product, which comprises the following steps of: S1) adding wet sodium percarbonate subjected to solid-liquid separation into a container, and then adding volatile alcohol substances into the container until the volatile alcohol substances submerge the wet sodium percarbonate; s2) mechanically stirring the wet sodium percarbonate and the alcohol substances, and fully mixing the wet sodium percarbonate and the alcohol substances; s3) carrying out suction filtration on alcohol substances in the mixture by using a vacuum suction filtration device; s4) placing the wet product subjected to suction filtration on a dry and clean vessel, and blow-drying the wet product by external wind power of volatile alcohol substances to obtain a sodium percarbonate product meeting the standard; s5, the particle size, effective active oxygen, bulk density and other quality indexes of the sodium percarbonate product are detected through a particle size analyzer. The method has the advantages that the drying time is remarkably shortened, the production process is controlled in time, production continuity is facilitated, and energy is saved.

Description

Technical Field

[0001] The invention relates to the technical field of sodium percarbonate product manufacturing, and in particular to a method for quickly drying a wet sodium percarbonate product. Background Art

[0002] Sodium percarbonate is an important chemical product, widely used in detergents, cleaning agents, disinfectants and other fields. Sodium percarbonate is usually produced by wet method, that is, sodium carbonate and hydrogen peroxide react under certain conditions. However, sodium percarbonate products prepared by wet method often contain high water content and need to be dried to reach the standard water content.

[0003] Drying is a key step in the production process of sodium percarbonate, and the drying effect directly affects the quality and production efficiency of the product. The existing drying technology is carried out through a dryer, and the drying time needs to be at least 1 hour to make the moisture content of the product reach the 2% requirement; then the dried sodium percarbonate product is tested for indicators such as effective active oxygen, particle size and bulk density to ensure that it meets customer requirements; if some indicators of the product do not meet the requirements, it is necessary to adjust the process and re-produce. The problems of the existing technology are: (1) The drying time is too long, which seriously affects the production efficiency; (2) The lag in drying time may cause serious loss of control of production and testing, which is not conducive to continuous production; (3) The existing drying technology often requires the use of a large amount of energy, which increases production costs.

[0004] CN1131123A mentions a method for producing stable sodium percarbonate, which uses industrial ethanol for dehydration during the production process, and then performs high-temperature drying at above 80°C. In the embodiment, the amount used is 150L of ethanol, which is heavy. Disadvantages: In actual operation, ethanol is flammable and explosive, and large-scale use is prone to safety accidents. Its vapor can form an explosive mixture with air, and the drying temperature of sodium percarbonate usually needs to reach above 80°C. The presence of a large amount of ethanol in the product is extremely dangerous. The "143kg (active oxygen content 15.4%)" in the embodiment exceeds the theoretical active oxygen content of 15.28%.

[0005] Therefore, how to improve drying efficiency and shorten drying time while ensuring product quality is an urgent problem to be solved in the current sodium percarbonate production field. Summary of the invention

[0006] The invention aims to provide a method for rapidly drying a wet sodium percarbonate product, which can significantly shorten the drying time, improve the production continuity, save energy and control the production process.

[0007] In order to achieve the above object, the present invention is implemented by the following technical solutions: A method for quickly drying a wet sodium percarbonate product comprises the following steps: S1) adding the wet sodium percarbonate after solid-liquid separation into a container, and then adding a volatile alcohol substance into the container without covering the wet sodium percarbonate; S2) using a mechanical stirrer to mix the wet sodium percarbonate and alcohol sufficiently; S3) filtering the alcohol in the mixture using a vacuum filtration device; S4) placing the wet product after filtration on a clean container and drying it with the help of wind from the volatile alcohol substances to obtain a sodium percarbonate product that meets the standards; S5) Use particle size analysis instruments to detect quality indicators such as particle size, effective active oxygen, and bulk density of sodium percarbonate products.

[0008] Furthermore, in step S1), the alcohol substance may be ethanol or isopropanol.

[0009] Furthermore, in step S1), the moisture content of the wet sodium percarbonate is ≥ 8%.

[0010] Furthermore, in step S2), the stirring time is 0.5-5 min.

[0011] Furthermore, in step S3), the working pressure of the vacuum filtration is 0.1 MPa, and the filtration time is 1-5 min.

[0012] Furthermore, in step S4), the air-drying time is 1-5 minutes, and the wind speed of the external wind is 5 m / s.

[0013] Furthermore, in step S5), the particle size of the sodium percarbonate product is 100-1000 μm.

[0014] Compared with the prior art, the present invention has the following advantages: Compared with the prior art, the technical solution of the present invention mainly solves the following technical problems: 1) the drying time is too long, which seriously affects the production efficiency; 2) the technical problem that the production and detection may be seriously out of control due to the lag in drying time, which is not conducive to the continuous operation of production; 3) the existing drying technology often requires the use of a large amount of energy, which increases the production cost.

[0015] Specifically, 1. The drying time is significantly shortened: the present invention uses alcohol substances as solvents and blows with the help of external wind to complete the drying of sodium percarbonate within 10 minutes, which greatly shortens the drying time and improves production efficiency; 2. Improves production continuity: Since the drying time is greatly shortened, the problem of serious loss of control of production and detection due to delayed drying time can be effectively avoided, which is conducive to continuous production operation; 3. Save energy: Compared with the prior art, the present invention does not need to use a large amount of energy during the drying process, thereby reducing production costs.

[0016] In general, the present invention is different from the prior art, especially the solution of patent CN1131123A. It is not used for large-scale production, which reduces the risk of organic alcohol solvents. It is only used to quickly dry the moisture of wet products and quickly detect the effective active oxygen, bulk density and particle size of the products. It has the advantages of short drying time, good production continuity, energy saving and control of production process. The alcohol substances after filtration can continue to be used, and after reaching a certain water content, the reduced pressure distillation can also continue to be used. DETAILED DESCRIPTION

[0017] The embodiments of the present invention are described in further detail. Example 1

[0018] A method for quickly drying a wet sodium percarbonate product comprises the following steps: Step S1) prepare a container with a capacity of 5 L, add the wet sodium percarbonate (water content ≥ 8%) after solid-liquid separation into the container, and then add ethanol to cover the wet sodium percarbonate; the mass percentage of ethanol used here is 95%, and the volume of ethanol added is 3 L. The selection and use of alcohol substances in the drying stage can effectively shorten the drying time and improve the drying efficiency.

[0019] Step S2) The mixture of wet sodium percarbonate and ethanol is stirred with an electric stirrer for 5 minutes. The stirring during this period of time allows the wet sodium percarbonate and ethanol to be fully mixed, which is beneficial to the subsequent drying process.

[0020] Step S3) Use a vacuum filtration device to filter out the ethanol in the mixture. The working pressure of the vacuum filtration device used is 0.1 MPa and the filtration time is 2 min.

[0021] Step S4) Place the wet product after filtration on a clean container and blow dry it for 3 minutes with the help of external wind to evaporate the ethanol, and then you can get a sodium percarbonate product that meets the standards; the wind speed used here is 5m / s.

[0022] Step S5) Finally, the particle size of the product is detected using a laser particle size analyzer, and the particle size of the dried sodium percarbonate product is 100-200 μm.

[0023] The above description is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the concept of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A method for rapidly drying a wet sodium percarbonate product, characterized in that The steps include: S1) adding the wet sodium percarbonate after solid-liquid separation into a container, and then adding a volatile alcohol substance into the container without covering the wet sodium percarbonate; S2) using a mechanical stirrer to mix the wet sodium percarbonate and alcohol sufficiently; S3) filtering the alcohol in the mixture using a vacuum filtration device; S4) placing the wet product after filtration on a clean container and drying it with the help of wind from the volatile alcohol substances to obtain a sodium percarbonate product that meets the standards; S5) Use particle size analysis instruments to detect quality indicators such as particle size, effective active oxygen, and bulk density of sodium percarbonate products.

2. A method for rapidly drying a wet sodium percarbonate product according to claim 1, characterized in that: In step S1), the alcohol substance is volatile and can carry water, and can be ethanol or isopropanol.

3. A method for rapidly drying a wet sodium percarbonate product according to claim 2, characterized in that: In step S1), the moisture content of the wet sodium percarbonate product is ≥ 8%.

4. A method for rapidly drying a wet sodium percarbonate product according to claim 1, characterized in that: In step S2), the stirring time is 0.5-5 min.

5. A method for quickly drying a wet sodium percarbonate product according to claim 1, characterized in that: In step S3), the working pressure of vacuum filtration is 0.1 MPa, and the filtration time is 1-5 min.

6. A method for quickly drying a wet sodium percarbonate product according to claim 1, characterized in that: In step S4), the air-drying time is 1-5 minutes, and the wind speed of the external wind is 5 m / s.

7. A method for quickly drying a wet sodium percarbonate product according to claim 1, characterized in that: In step S5), the particle size of the sodium percarbonate product is 100-1000 μm.