Crystallization filtering device in imazethapyr herbicide production

Abstract

The utility model relates to the technical field of chemical production equipment, and discloses a crystallizing and filtering device in imazethapyr herbicide production, which comprises a cylindrical crystallizing tank provided with a cooling jacket, the top of the crystallizing tank is provided with a feed port, and the bottom of the crystallizing tank is provided with a discharge port; an outlet of a feeding pipeline internally connected with the feeding hole of the crystallizing tank and the circumference of the inner cavity of the crystallizing tank are arranged in a tangential direction; a plurality of baffles are arranged in the middle of the side of the inner cavity of the crystallizing tank; a discharge port of the crystallizing tank is communicated to a vertically-through cylindrical screen in the separator through a pipeline, a material circulating pipeline is arranged at the upper part of the separator and the upper part of the crystallizing tank, and a diaphragm pump is arranged on the material circulating pipeline; and a discharge hole in the lower part of the separator is communicated to a centrifugal machine through a discharge valve and a pipeline. The utility model has the advantages of short crystallization period, uniform crystal particles, high filtering speed, high production efficiency and good product quality.

Description

TECHNICAL FIELD

[0001] The utility model relates to chemical production equipment technical field, concretely relates to a kind of crystallization filter devices in imazethapyr herbicide production. BACKGROUND

[0002] In agricultural production, the quality of herbicide is crucial for weed control effect, and herbicide crystallization process directly affects its product quality, production efficiency and cost control. The traditional herbicide crystallization process is mostly intermittent operation, most of which adopts kettle crystallization, and imazethapyr is obtained by stirring, cooling and centrifugation. However, this production process has the problems of many impurities in the product, high labor intensity, and difficult to completely consistent crystallization conditions each time, resulting in large fluctuations in product quality and affecting the stability of herbicidal effect. Secondly, in the traditional process, it is difficult to accurately control the size of the crystalline particles in the crystallization separation stage, resulting in uneven product crystalline particles, which not only affects the appearance of the product, but also may affect its dissolution performance and drug efficacy.

[0003] Therefore, the defects of traditional equipment are solved, and the efficiency and safety of wastewater treatment are improved. SUMMARY

[0004] The technical problem to be solved by the utility model is to provide a crystallization filter device in imazethapyr herbicide production, which overcomes the technical defects in the prior art, has short crystallization period, uniform crystal particles, fast filtration speed, high production efficiency and good product quality.

[0005] To solve the above technical problems, the technical scheme of the utility model is as follows:

[0006] A crystallization filter device in imazethapyr herbicide production, comprising a cylindrical crystallization tank provided with a cooling jacket, a feed inlet is provided at the top of the crystallization tank, and a discharge outlet is provided at the bottom; the outlet of the feed pipe connected to the feed inlet of the crystallization tank is arranged in a tangential direction with the inner cavity of the crystallization tank; a plurality of flow baffles are arranged at the middle part of the side surface of the inner cavity of the crystallization tank; the discharge outlet of the crystallization tank is connected to a cylindrical screen in the upper and lower permeable separator through a pipeline; a material circulation pipeline is provided at the upper part of the separator and the upper part of the crystallization tank, and a diaphragm pump is provided on the material circulation pipeline; the discharge outlet of the lower part of the separator is connected to a centrifuge through a discharge valve and a pipeline; temperature sensors are arranged at the inlet and outlet of the cooling jacket in the crystallization tank; liquid level sensors are arranged in the crystallization tank and the separator; the diaphragm pump, the centrifuge, the temperature sensors and the liquid level sensors are electrically connected to a PLC control system.

[0007] Preferably, pressure sensors are arranged in the crystallization tank, the separator and the connecting pipeline thereof. The pressure sensors are electrically connected to the PLC control system.

[0008] Preferably, the cooling jacket is provided with an inlet and an outlet, which are connected to a cooling medium supply device and a cooling medium collection device through pipes and pumps respectively.

[0009] Preferably, the inner wall of the crystallization tank is provided with an anti-sticking coating. The anti-sticking coating can effectively prevent the crystal from adhering to the inner wall of the tank and scaling, reduce the product loss caused by the crystal residue, reduce the frequency and difficulty of equipment cleaning, improve the continuity of production and the service life of the equipment.

[0010] Preferably, the baffle is uniformly provided with four pieces. The baffle is in the shape of a side-lying arch, that is, the upper and lower edges of the baffle are parallel to the ground, and the side facing the center of the crystallization tank is arc-shaped and protruding. In this way, when the material liquid enters the crystallization tank along the tangent direction, it can change the flow direction when encountering the baffle, so that the solution forms a vortex flow. The edges of the baffle are rounded, which can reduce the turbulence and local pressure change when the solution flows through the edges of the baffle, avoid the crystal from gathering or growing unevenly at the edges of the baffle due to local turbulence, and also reduce the erosion and wear of the baffle by the solution, prolonging the service life of the baffle.

[0011] Preferably, a valve is arranged on the pipe between the outlet of the crystallization tank and the separator. The valve is used to control the flow direction and flow rate of the material.

[0012] Preferably, the screen is detachably connected to the inlet of the separator. Different mesh sizes of the screen can be selected according to the production needs. The mesh diameter is 0.1 mm to 5 mm.

[0013] Preferably, the separator is a separator with a cylindrical upper part and a funnel-shaped lower part.

[0014] Preferably, the material circulation pipe is arranged in a tangential direction to the circumference of the inner cavity of the crystallization tank at the material outlet of the crystallization tank.

[0015] Preferably, the diaphragm pump is a QBK-40 model produced by Jiangsu Wolong Pump Valve Co., Ltd.

[0016] Preferably, the solid material outlet of the centrifuge is connected to the drying device through a pipe, and the liquid material outlet is connected to the mother liquor collection tank through a pipe.

[0017] Preferably, the centrifuge is a PLD type pull-bag type scraper full-automatic centrifuge, which is a PLD-1600 model produced by Jiangsu Huada Centrifuge Manufacturing Co., Ltd.

[0018] Due to the adoption of the above technical solutions, the present application has the following advantages:

[0019] The screen can make the final product crystal particle size uniform, is favorable for improving product dissolving performance and drug effect, and improving product overall quality; and the filter screen has large filtering area and high speed, and material cannot be blocked under high flow speed; the flow blocking and flow disturbing structure designed in the crystallizer can promote solution to be fully mixed in the cooling and crystallization process, avoid local overcooling or overheating phenomenon, effectively improve crystallization efficiency, shorten the whole crystallization period, and reduce production cost.

[0020] Moreover, the utility model discloses can realize continuous crystallization, ensure the consistency of each batch of herbicide crystallization process, reduce the product quality difference caused by batch difference, and improve product stability. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is the structure schematic diagram of the utility model embodiment;

[0022] Figure 2 It is the overhead structure schematic diagram of the utility model crystallization tank;

[0023] In the drawing, 1, cooling jacket;2, crystallization tank;3, feed pipe;4, flow baffle;5, separator;6, screen;7, material circulation pipe;8, diaphragm pump;9, centrifuge. DETAILED DESCRIPTION

[0024] The utility model is further described below in combination with the drawings and examples.

[0025] Example one

[0026] As Figure 1 And Figure 2 As shown in a kind of imazethapyr herbicide production in the crystallization filter device, including the cylindrical crystallization tank 2 being equipped with cooling jacket 1, the top of crystallization tank 2 is equipped with feed inlet (not marked), bottom is equipped with discharge outlet (not marked);Feed inlet is connected with the tangential direction setting of feed pipe 3 export and the inner cavity circumference of crystallization tank 2;Four flow baffles 4 are evenly arranged in the middle part of the inner cavity side of crystallization tank 2;The discharge outlet of crystallization tank 2 is connected to the upper and lower permeable cylindrical screen 6 in separator 5 through pipeline, material circulation pipe 7 is equipped on the upper portion of separator 5 and the upper portion of crystallization tank 2, diaphragm pump 8 is equipped on material circulation pipe 7, for circulating material;The discharge outlet of the lower portion of separator 5 is connected to centrifuge 9 through unloading valve (not marked) and pipeline;Temperature sensor (not marked) is equipped in the inlet and outlet of cooling jacket 1 in crystallization tank 2, liquid level sensor (not marked) is equipped in crystallization tank 2 and separator 5;Diaphragm pump 8, centrifuge 9, temperature sensor and liquid level sensor are all electrically connected to PLC control system (not marked).

[0027] In actual application, the imazethapyr herbicide solution enters the crystallization tank 2 through the top feed inlet, and the outlet of the feed pipeline 3 is arranged in a tangential direction with the inner cavity of the crystallization tank 2, so that the solution generates a rotating flow in the tank after entering, forming a certain initial stirring effect, and promoting the solution to be preliminarily dispersed in the tank;

[0028] The cooling jacket 1 of the crystallization tank 2 is started to cool the material liquid, the flow speed of the cooling medium in the jacket is controlled by the PLC control system, the heat of the material liquid in the crystallization tank 2 is taken away, the temperature of the material liquid is gradually reduced, the cooling speed is controlled at 1 ℃ / min to 5 ℃ / min, and the material liquid reaches a supersaturated state to crystallize. The flow speed control of the material liquid in the tank and the four flow baffles 4 are relatively key, the flow baffles 4 can effectively change the flow direction of the solution, form complex vortex flow and up-down disturbance flow; this flow mode can avoid local overcooling or overheating of the solution, ensure uniform distribution of the temperature and concentration in the whole crystallization tank 2, create good conditions for uniform growth of the crystals, help to shorten the crystallization period, and improve the crystallization efficiency and product quality stability.

[0029] The crystallized material flows into the cylindrical screen 6 in the separator 5 from the bottom discharge port of the crystallization tank 2, the screen preliminarily screens the crystalline particles, the crystals meeting the size requirement are left in the screen 6, the flow speed is slowed down and sinks to the bottom of the separator 5, and the smaller particles or the solution not crystallized flow through the screen 6 along with the material liquid. The upper part of the separator 5 is connected with the upper part of the crystallization tank 2 through the material circulation pipeline 7, the diaphragm pump 8 on the pipeline pumps the material not sufficiently crystallized or the material with smaller particles back to the crystallization tank 2 for re-crystallization to continue to grow the crystals; the material flows from the crystallization tank 2 into the separator 5, continues to be separated, the qualified crystals are intercepted by the screen 6 in the flowing process, the flow speed is slowed down and precipitates in the lower part of the separator, and the saturated solution can pass through the screen 6 to continue to circulate to the crystallization tank 2 for further crystallization.

[0030] The crystalline product that sinks to the lower part of the separator 5 after being preliminarily separated through the screen 6 enters the centrifugal machine 9 through the discharge valve and the pipeline; the centrifugal machine 9 further separates the mother liquor in the crystals by using the centrifugal force, the separated solid material enters the drying device through the pipeline from the solid material outlet of the centrifugal machine 9 for drying treatment, and the final imazethapyr herbicide product is obtained.

[0031] It should be understood that the embodiments are only used for illustrating the present application and are not used for limiting the scope of the present application. In addition, it should be understood that, after reading the content taught by the present application, those skilled in the art can make various changes or modifications to the present application, and these equivalent forms also fall within the scope defined by the claims of the present application.

Claims

1. A crystallization filter device in imazethapyr herbicide production, characterized by, The application relates to a cylindrical crystallization tank provided with a cooling jacket, a feed inlet is arranged at the top of the crystallization tank, a discharge outlet is arranged at the bottom of the crystallization tank, the outlet of a feed pipeline connected with the feed inlet of the crystallization tank is arranged in a tangent direction of the inner cavity of the crystallization tank, a plurality of flow baffles are arranged at the middle part of the side of the inner cavity of the crystallization tank, a cylindrical screen net which is permeable up and down is connected to the discharge outlet of the crystallization tank through a pipeline, a material circulation pipeline is arranged between the upper part of the crystallization tank and the upper part of a separator, a diaphragm pump is arranged on the material circulation pipeline, temperature sensors are arranged at the inlet and outlet of the cooling jacket in the crystallization tank, liquid level sensors are arranged in the crystallization tank and the separator, the diaphragm pump, the centrifuge, the temperature sensors and the liquid level sensors are electrically connected to a PLC control system.

2. The imazethapyr weedicide production crystallization filter apparatus according to claim 1, characterized by, Pressure sensors are arranged in the crystallization tank, the separator and the connecting pipeline.

3. The imazethapyr weedicide production crystallization filter apparatus according to claim 1, characterized by, The cooling jacket is provided with a feed inlet and a discharge outlet, the feed inlet and the discharge outlet are connected to a cooling medium supply device and a cooling medium collecting device through pipelines and pumps.

4. The imazethapyr weedicide production crystallization filter apparatus according to claim 1, characterized by, An anti-sticking coating is arranged on the inner wall of the crystallization tank.

5. The imazethapyr weedicide production crystallization filter apparatus according to claim 1, wherein, The flow baffles are uniformly arranged with four pieces.

6. The imazethapyr weedicide production crystallization filter apparatus according to claim 1, wherein, A valve is arranged on the pipeline between the discharge outlet of the crystallization tank and the separator.

7. The imazethapyr weedicide production crystallization filter apparatus according to claim 1, wherein The screen net is detachably connected to the feed inlet of the separator.

8. The imazethapyr weedicide production crystallization filter apparatus according to claim 1, wherein, The material outlet of the material circulation pipeline is arranged in a tangent direction of the inner cavity of the crystallization tank.

9. The imazethapyr weedicide production crystallization filter apparatus according to claim 1, wherein, The solid material outlet of the centrifuge is connected to a drying device through a pipeline.

Images