Solid-liquid continuous separation device for preparing aquacide dichloride

Abstract

The utility model discloses a solid-liquid continuous separation device for preparing aquacide dichloride, which belongs to the technical field of solid-liquid separation and comprises a box body, a first filter screen is detachably connected in the box body and divides the box body into an upper cavity and a lower cavity, a pressure reducing pump is connected to the outer side of the lower cavity, and a second filter screen is connected to the outer side of the pressure reducing pump. The output end of the pressure reduction pump extends into the box body, a cold and heat conveying assembly is arranged in the lower cavity and used for heating and cooling reactant liquid in the lower cavity, a drainage channel is formed in the lower portion of the box body, a separation box is arranged below the box body, and a second filter screen is detachably connected into the separation box. According to the utility model, the cold and hot conveying component is matched with the pressure reducing pump to crystallize reactants, so that the solid-liquid filtering efficiency and effect are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of solid-liquid separation, in particular to a solid-liquid continuous separation device for preparing diquat dichloride. Background Art

[0002] Diquat dichloride is a non-selective contact herbicide with conductivity. After being absorbed by green plants, it will inhibit the electron transfer of photosynthesis. In the preparation process of diquat dichloride, solid-liquid separation is a key step, which is used to separate the solid product generated by the reaction from the liquid reagent or solvent.

[0003] In the preparation process of diquat dichloride, the raw materials and solvent required for the reaction are fed into the reaction zone at a predetermined ratio and rate. In the reaction zone, the raw materials and the solvent undergo a chemical reaction at a specific temperature and pressure to generate a solid product of diquat dichloride and a liquid after the reaction. Appropriate solid-liquid separation technology, such as centrifugal separation, filtration or sedimentation, is used to separate the solid and liquid diquat dichloride according to the difference in physical properties.

[0004] Some solid-liquid separation devices in the prior art perform separation through the centrifugal force generated by the rotation of a centrifuge. The centrifugal solid-liquid separation method requires a long time to complete the filtration process, and the separation effect may not be good for suspensions containing a large number of solid particles. The centrifugal solid-liquid separation method has a poor separation effect on fine particles, which may result in a product with low purity. The derived solid may contain liquid components, and the separation effect is not ideal. To this end, we provide a solid-liquid continuous separation device for the preparation of diquat dichloride to solve the above problems. Utility Model Content

[0005] The embodiment of the utility model provides a solid-liquid continuous separation device for preparing diquat dichloride salt to solve the above-mentioned technical problems.

[0006] The embodiment of the utility model adopts the following technical scheme: it includes a box body, a first filter screen is detachably connected to the inside of the box body, the first filter screen divides the box body into an upper chamber and a lower chamber, a pressure reducing pump is connected to the outside of the lower chamber, the output end of the pressure reducing pump extends to the inside of the box body, a hot and cold transport component is provided inside the lower chamber, the hot and cold transport component is used for heating and cooling the reactant liquid in the lower chamber, a drainage channel is provided at the lower part of the box body, a separation box is provided below the box body, a second filter screen is detachably connected to the inside of the separation box, and the filtering effect is improved through two solid-liquid separations.

[0007] Furthermore, the hot and cold transport component includes a spiral transmission pipe, a heat inlet pipe connected to one end of the spiral transmission pipe, and a cold water pipe. The cold water pipe is provided with a water pump. Both the heat inlet pipe and the cold water pipe are provided with a first valve. The first valve on the cold water pipe is closed, and the heating medium is transported through the heat inlet pipe. After the transportation, the first valve on the heat inlet pipe is closed, and the refrigerant medium is input from the cold water pipe through the water pump to cool the inside of the box.

[0008] Furthermore, a box cover is threadedly connected to the top of the box body, and a feed port is provided on the box cover. Removing the box cover facilitates taking out the first filter screen.

[0009] Furthermore, a second valve is provided on one side of the drainage channel. After filtering inside the box, the second valve is opened to allow the liquid to flow into the separation box for secondary filtering.

[0010] Furthermore, an observation port is provided on the outer wall of the box body to facilitate observation of the internal conditions of the box body.

[0011] Furthermore, a support column is provided above the separation box, and the other end of the support column is connected to the bottom of the box body. There is a certain distance between the box body and the separation box. A liquid guide tube is provided on one side of the separation box to support the box body and facilitate the removal of the second filter.

[0012] At least one of the above technical solutions adopted in the embodiment of the utility model can achieve the following beneficial effects:

[0013] In the utility model, preliminary filtration is performed through the first filter screen, and the liquid flows into the lower cavity. The boiling point of the liquid reactant in the lower cavity is reduced by decompression, and the reactant is decomposed by heating in conjunction with the cold and hot conveying components, and impurities are effectively removed. The target product can be precipitated in the form of crystals by cooling and crystallization, thereby obtaining a high-purity product, which is beneficial to the precipitation of diquat dichloride salt from the liquid reactant. After that, the heating is stopped, and the refrigeration medium is conveyed by the cold and hot conveying components. After cooling, the solubility of the reactant is reduced, resulting in the generation of an oversaturated state, which is beneficial to the precipitation of the solute in the form of crystals. After the reactant reacts in the box, the second valve is opened, and the reactant flows into the separation box through the drainage channel, and the reactant is filtered for the second time through the second filter screen. Through the two solid-liquid filtrations, the solid-liquid filtration efficiency and effect are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0015] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0016] Figure 2 The cross-sectional structure of the utility model is shown in FIG. Figure 1 ;

[0017] Figure 3 The cross-sectional structure of the utility model is shown in FIG. Figure 2 ;

[0018] Figure 4 The utility model provides Figure 2 A schematic diagram of the enlarged structure in the middle.

[0019] Reference numerals:

[0020] Box body 1, first filter screen 11, upper chamber 111, lower chamber 112, pressure reducing pump 12, drainage channel 13, separation box 14, second filter screen 15, spiral transmission pipe 2, heat inlet pipe 21, cold water pipe 22, water pump 23, first valve 24, box cover 3, feed port 31, second valve 4, observation port 5, support column 6, liquid guide tube 61. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in combination with the specific embodiments of the utility model and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] The technical solutions provided by various embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0023] The utility model provides a solid-liquid continuous separation device for preparing diquat dichloride salt, including a box body 1, a first filter screen 11 is detachably connected inside the box body 1, the first filter screen 11 divides the box body 1 into an upper chamber 111 and a lower chamber 112, a pressure reducing pump 12 is connected to the outside of the lower chamber 112, the output end of the pressure reducing pump 12 extends to the inside of the box body 1, a cold and hot conveying component is arranged inside the lower chamber 112, and the cold and hot conveying component is used for heating and cooling the reactant liquid in the lower chamber 112, a drainage channel 13 is arranged at the bottom of the box body 1, a separation box 14 is arranged below the box body 1, a second filter screen 15 is detachably connected inside the separation box 14, and the solid-liquid reactants enter the feed port 31 and enter through the first filter screen 11. The first filter screen 11 is detachable, which is convenient for taking out solid substances and cleaning the filter screen. The liquid flows into the lower chamber 112, and is heated by the cold and hot conveying component. The lower chamber 112 is evacuated and pressurized by the pressure reducing pump 12. The boiling point of the liquid reactant in the lower chamber 112 is reduced by reducing the pressure. The reactant is heated by the cold and hot conveying component to decompose the reactant, which is beneficial to precipitate dichloride salt of the liquid reactant. Then, the heating is stopped. Since the solubility of the substance usually increases with the increase of temperature and decreases with the decrease of temperature, the refrigerant is transported by the cold and hot conveying component. After cooling, the solubility of the reactant decreases, resulting in the generation of a supersaturated state, which is beneficial to the solute in the form of crystals. of After the reactants react in the box 1, the second valve 4 is opened, and the reactants flow into the separation box 14 through the drainage channel 13, and the reactants are filtered for the second time through the second filter screen 15, and the solids are retained in the second filter screen 15 to achieve solid-liquid separation.

[0024] Preferably, the hot and cold transport assembly includes a spiral transmission pipe 2, a heat inlet pipe 21 connected to one end of the spiral transmission pipe 2, and a cold water pipe 22, a water pump 23 is provided on the cold water pipe 22, and a first valve 24 is provided on both the heat inlet pipe 21 and the cold water pipe 22, and the output end of the spiral transmission pipe 2 is connected to an external recovery device. The first valve 24 on the cold water pipe 22 is closed, and the heating medium is transported through the heat inlet pipe 21. After the transport, the first valve 24 on the heat inlet pipe 21 is closed, and the refrigerant medium is input from the cold water pipe 22 through the water pump 23 to cool the inside of the box 1, thereby heating or cooling the reactants in the lower chamber 112.

[0025] Preferably, a box cover 3 is threadedly connected to the top of the box body 1, and a feed port 31 is opened on the box cover 3. The first filter screen 11 can be taken out by opening the box cover 3, which is convenient for taking out solid matter and cleaning the first filter screen 11.

[0026] Preferably, a second valve 4 is provided on one side of the drainage channel 13. After the reactants in the box body 1 are filtered, the second valve 4 is opened, and the reactants in the lower chamber 112 flow into the separation box 14 for secondary filtration.

[0027] Preferably, an observation port 5 is provided on the outer wall of the box body 1 to facilitate observation of the liquid level inside the box body 1 and to prevent the liquid from being pumped out when the pressure reducing pump 12 is working due to the liquid level being too high.

[0028] Preferably, a support column 6 is provided above the separation box 14, and the other end of the support column 6 is connected to the bottom of the box body 1. There is a certain distance between the box body 1 and the separation box 14, and the distance is between 20-50 cm, which is convenient for taking out the second filter screen 15 and cleaning the second filter screen 15. A liquid guide tube 61 is provided on one side of the separation box 14, and the liquid in the separation box 14 flows out through the liquid guide tube 61.

[0029] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. A solid-liquid continuous separation device for preparing diquat dichloride, comprising a housing (1), characterized in that: A first filter screen (11) is detachably connected to the interior of the box (1), the first filter screen (11) divides the box (1) into an upper chamber (111) and a lower chamber (112), the outer side of the lower chamber (112) is connected to a pressure reducing pump (12), the output end of the pressure reducing pump (12) extends to the interior of the box (1), a cold and hot transport component is provided inside the lower chamber (112), the cold and hot transport component is used to heat up and cool down the reactant liquid in the lower chamber (112), a drainage channel (13) is provided at the bottom of the box (1), a separation box (14) is provided below the box (1), and a second filter screen (15) is detachably connected to the interior of the separation box (14).

2. A solid-liquid continuous separation device for preparing diquat dichloride according to claim 1, characterized in that: The hot and cold transport assembly comprises a spiral transmission pipe (2), a heat inlet pipe (21) connected to one end of the spiral transmission pipe (2), and a cold water pipe (22), the cold water pipe (22) being provided with a water pump (23), and both the heat inlet pipe (21) and the cold water pipe (22) being provided with a first valve (24).

3. The solid-liquid continuous separation device for preparing diquat dichloride according to claim 1, characterized in that: A box cover (3) is threadedly connected to the top of the box body (1), and a feed port (31) is provided on the box cover (3).

4. A solid-liquid continuous separation device for preparing diquat dichloride according to claim 1, characterized in that: A second valve (4) is provided on one side of the drainage channel (13).

5. The solid-liquid continuous separation device for preparing diquat dichloride according to claim 1, characterized in that: An observation port (5) is provided on the outer wall of the box body (1).

6. The solid-liquid continuous separation device for preparing diquat dichloride according to claim 1, characterized in that: A support column (6) is provided above the separation box (14); the other end of the support column (6) is connected to the bottom of the box body (1); there is a certain distance between the box body (1) and the separation box (14); and a liquid guide tube (61) is provided on one side of the separation box (14).

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