A continuous extraction tower for the production of thiophanate-methyl

Abstract

The utility model discloses a continuous extraction tower for the production of methyl thiophanate, comprising an extraction tower body, a heavy liquid inlet and a light liquid inlet are respectively provided near the top and the bottom of one side of the extraction tower body, a finished product discharge port and a waste liquid discharge port are respectively provided at the top and the bottom of the extraction tower body, a plurality of sieve plates are evenly distributed inside the extraction tower body, sieve holes are opened on the sieve plates, an intermittent plugging mechanism is provided above the sieve plates, a stirring mechanism is provided between adjacent sieve plates, the intermittent plugging mechanism comprises a lifting bracket, a plurality of plugging rods are fixed on the lifting bracket, and the plugging rods correspond to the sieve holes one by one. The extraction tower in the utility model can prolong the light liquid accumulation time, realize convection impact, improve the mass transfer speed and extraction effect, has a stable structure, reliable operation, and can effectively solve the problems of low extraction efficiency and unsatisfactory effect of existing extraction equipment.

Description

Technical Field

[0001] The utility model relates to the technical field of thiophanate-methyl production, in particular to a continuous extraction tower used for thiophanate-methyl production. Background Art

[0002] Methyl thiophanate is a broad-spectrum systemic low-toxic fungicide with preventive and therapeutic effects, and is widely used in agricultural production. In the production process of methyl thiophanate, sodium thiocyanate and methyl chloroformate react directly in water under the catalytic action of a phase transfer catalyst to generate methyl isothiocyanate formate, and then methyl isothiocyanate formate in the aqueous phase is extracted with toluene and added dropwise to a prepared o-phenylenediamine toluene solution of a certain concentration to finally generate methyl thiophanate, which is then centrifuged, washed, and dried to obtain the finished product. Extraction is an important step, the purpose of which is to separate the target product from the reaction mixture.

[0003] Traditional extraction equipment has problems such as low extraction efficiency and unsatisfactory extraction effect when performing methyl thiophanate production extraction. The liquid in the existing extraction tower is not mixed sufficiently, resulting in incomplete extraction, which affects the purity and yield of methyl thiophanate. Utility Model Content

[0004] In order to solve the problems mentioned in the above background technology, the utility model provides a continuous extraction tower for the production of thiophanate-methyl.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A continuous extraction tower for producing methyl thiophanate comprises an extraction tower body, a heavy liquid inlet and a light liquid inlet are respectively arranged near the top and the bottom of one side of the extraction tower body, a finished product discharge port and a waste liquid discharge port are respectively arranged at the top and the bottom of the extraction tower body, a plurality of sieve plates are evenly distributed inside the extraction tower body, sieve holes are opened on the sieve plates, an intermittent plugging mechanism is arranged above the sieve plates, a stirring mechanism is arranged between adjacent sieve plates, the intermittent plugging mechanism comprises a lifting bracket, a plurality of plugging rods are fixed on the lifting bracket, and the plugging rods correspond to the sieve holes one by one.

[0007] Preferably, the lifting bracket is located directly above the sieve plate, and adjacent lifting brackets are fixed by a first connecting bracket. A lifting drive box is provided at the top of the extraction tower body, and the output end of the lifting drive box is fixed to the topmost lifting bracket.

[0008] Preferably, a vertically arranged cylinder is fixed inside the lifting drive box, a second connecting bracket is fixed to the output end of the cylinder, a connecting vertical axis is fixed to the bottom end of the second connecting bracket, and the bottom end of the connecting vertical axis extends to the interior of the extraction tower body and is fixed to the topmost lifting bracket.

[0009] Preferably, guide rods are fixed on both sides of the top end of the second connecting bracket, a guide sleeve is fixed on the inner wall of the top end of the lifting drive box, and the top end of the guide rod extends into the guide sleeve.

[0010] Preferably, the stirring mechanism comprises a threaded sleeve rotatably mounted on the bottom end of the sieve plate, and a plurality of stirrers are fixed to the outside of the threaded sleeve.

[0011] Preferably, a threaded rod is fixed at a position corresponding to the top of the lifting bracket and the threaded sleeve, and the top of the threaded rod extends to the inside of the threaded sleeve.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. Improve the extraction effect: By setting up the intermittent plugging mechanism, the light liquid can be accumulated under the sieve plate for a longer time, so that it can be more fully mixed with the heavy liquid, improving the extraction effect. When the sieve hole is opened, the light liquid is accelerated to flow to the next level, which has the effect of convection impact, further improves the mixing effect, and provides better mass transfer conditions.

[0014] 2. Enhanced mass transfer rate: The setting of the sieve plate enables the light liquid to achieve a process of dispersion-reaccumulation-redispersion in the tower, which increases the mass transfer rate and helps to separate the target product from the reaction mixture more efficiently.

[0015] 3. Promote the mass transfer process: The linkage design of the stirring mechanism and the lifting bracket, that is, when the lifting bracket is raised or lowered, the threaded rod is driven to move in the threaded sleeve, so that the threaded sleeve drives the agitator to rotate, further promoting the mass transfer process of methyl isothiocyanate from the water phase to the toluene phase, and improving the extraction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is the front view of the utility model;

[0018] Figure 2 This is a sectional view from the main perspective of the utility model;

[0019] Figure 3 It is a three-dimensional cross-sectional view of the utility model;

[0020] Figure 4 for Figure 2A zoomed-in detail of position A in the middle;

[0021] Figure 5 This is an enlarged detail view of the screen plate of the utility model;

[0022] Figure 6 This is an enlarged detail view of the lifting bracket of the utility model;

[0023] Figure 7 This is a cross-sectional view of the lifting drive box of the utility model;

[0024] In the figure: 1. extraction tower body; 101. heavy liquid inlet; 102. light liquid inlet; 103. finished product discharge port; 104. waste liquid discharge port; 2. sieve plate; 201. sieve hole; 202. threaded sleeve; 203. agitator; 3. lifting bracket; 301. first connecting bracket; 302. blocking rod; 303. threaded rod; 4. lifting drive box; 401. cylinder; 402. second connecting bracket; 403. connecting vertical axis; 404. guide rod; 405. guide sleeve. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment 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.

[0026] Example

[0027] Reference Figure 1-7 A continuous extraction tower for the production of methyl thiophanate comprises an extraction tower body 1, a heavy liquid inlet 101 and a light liquid inlet 102 are respectively provided at one side of the extraction tower body 1 near the top and the bottom, a finished product discharge port 103 and a waste liquid discharge port 104 are respectively provided at the top and the bottom of the extraction tower body 1, a plurality of sieve plates 2 are equidistantly distributed inside the extraction tower body 1, sieve holes 201 are opened on the sieve plates 2, an intermittent plugging mechanism is provided above the sieve plates 2, a stirring mechanism is provided between adjacent sieve plates 2, the intermittent plugging mechanism comprises a lifting bracket 3, a plurality of plugging rods 302 are fixed on the lifting bracket 3, and the plugging rods 302 correspond to the sieve holes 201 one by one;

[0028] Toluene is added into the extraction tower body 1 through the light liquid inlet 102, and the liquid to be extracted is introduced into the extraction tower body 1 through the heavy liquid inlet 101. Due to its density, toluene flows from bottom to top and contacts the heavy liquid flowing from top to bottom. Due to the blocking effect of the sieve plate 2, it will aggregate into a layer of light liquid under the sieve plate 2, and then disperse and flow through the sieve holes 201 to the position of the next sieve plate 2, thereby achieving the purpose of dispersion-reaccumulation-redispersion, thereby improving the mass transfer rate. The intermittent blocking mechanism can extend the accumulation time of the light liquid under the sieve plate 2, so that it can be more fully mixed with the heavy liquid and the extraction effect can be improved. Then, when the sieve holes 201 are opened, the light liquid continues to accelerate to the next level, which can play a role of convection impact, improve the mixing effect, provide better mass transfer regulation, and cooperate with the stirring of the stirring mechanism to further improve the mixing degree and the extraction effect.

[0029] The lifting bracket 3 is located directly above the sieve plate 2, and adjacent lifting brackets 3 are fixed by a first connecting bracket 301. A lifting drive box 4 is provided at the top of the extraction tower body 1. The output end of the lifting drive box 4 is fixed to the top lifting bracket 3. A vertically arranged cylinder 401 is fixed inside the lifting drive box 4. A second connecting bracket 402 is fixed to the output end of the cylinder 401. A connecting vertical shaft 403 is fixed to the bottom end of the second connecting bracket 402. The bottom end of the connecting vertical shaft 403 extends to the inside of the extraction tower body 1 and is fixed to the top lifting bracket 3.

[0030] The cylinder 401 can drive the lifting bracket 3 to rise and fall. When the lifting bracket 3 rises, the blocking rod 302 separates from the sieve hole 201. When the lifting bracket 3 descends, the blocking rod 302 blocks the sieve hole 201, thereby achieving an intermittent blocking effect.

[0031] Guide rods 404 are fixed on both sides of the top of the second connecting bracket 402, and a guide sleeve 405 is fixed on the inner wall of the top of the lifting drive box 4. The top of the guide rod 404 extends into the guide sleeve 405. The setting of the guide rod 404 and the guide sleeve 405 can guide the lifting and lowering of the second connecting bracket 402, improve the lifting and lowering accuracy and stability, make the operation of the intermittent blocking mechanism more reliable, and ensure the stability of the extraction process.

[0032] A stirring mechanism is provided, including a threaded sleeve 202 rotatably mounted at the bottom end of the sieve plate 2, a plurality of stirrers 203 are fixed to the outside of the threaded sleeve 202, a threaded rod 303 is fixed to the top of the lifting bracket 3 corresponding to the threaded sleeve 202, and the top of the threaded rod 303 extends to the inside of the threaded sleeve 202. When the lifting bracket 3 is lifted or lowered, the threaded rod 303 is driven to move up and down in the threaded sleeve 202, so that the threaded sleeve 202 drives the stirrer to rotate, thereby stirring the mixed liquid of the water phase and the toluene phase, further promoting the mass transfer process of methyl isothiocyanate from the water phase to the toluene phase, improving the extraction efficiency, and better adapting to the requirements for the extraction effect in the new production process.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0034] 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 connection; it can be a mechanical connection, a direct connection, or an indirect connection 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.

[0035] The control method of the present invention is automatic control through a controller. The control circuit of the controller can be realized by simple programming by technicians in this field. The provision of power is also common knowledge in this field. The present invention is mainly used to protect mechanical devices, so the present invention will no longer explain the control method and circuit connection in detail.

[0036] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A continuous extraction tower for producing thiophanate-methyl, comprising an extraction tower body (1), characterized in that: A heavy liquid inlet (101) and a light liquid inlet (102) are respectively provided on one side of the extraction tower body (1) near the top and the bottom, and a finished product discharge outlet (103) and a waste liquid discharge outlet (104) are respectively provided on the top and the bottom of the extraction tower body (1). A plurality of sieve plates (2) are equidistantly distributed inside the extraction tower body (1), and sieve holes (201) are provided on the sieve plates (2). An intermittent plugging mechanism is provided above the sieve plates (2), and a stirring mechanism is provided between adjacent sieve plates (2). The intermittent plugging mechanism comprises a lifting bracket (3), and a plurality of plugging rods (302) are fixed on the lifting bracket (3), and the plugging rods (302) correspond one to one with the sieve holes (201).

2. A continuous extraction tower for the production of thiophanate-methyl according to claim 1, characterized in that: The lifting brackets (3) are located directly above the sieve plate (2), and adjacent lifting brackets (3) are fixed via a first connecting bracket (301). A lifting drive box (4) is provided at the top of the extraction tower body (1), and an output end of the lifting drive box (4) is fixed to the topmost lifting bracket (3).

3. A continuous extraction tower for the production of thiophanate-methyl according to claim 2, characterized in that: A vertically arranged cylinder (401) is fixed inside the lifting drive box (4), a second connecting bracket (402) is fixed to the output end of the cylinder (401), a connecting vertical shaft (403) is fixed to the bottom end of the second connecting bracket (402), and the bottom end of the connecting vertical shaft (403) extends to the inside of the extraction tower body (1) and is fixed to the uppermost lifting bracket (3).

4. A continuous extraction tower for the production of thiophanate-methyl according to claim 3, characterized in that: Guide rods (404) are fixed on both sides of the top end of the second connecting bracket (402), a guide sleeve (405) is fixed on the inner wall of the top end of the lifting drive box (4), and the top end of the guide rod (404) extends into the guide sleeve (405).

5. A continuous extraction tower for the production of thiophanate-methyl according to claim 1, characterized in that: The stirring mechanism comprises a threaded sleeve (202) rotatably mounted on the bottom end of the sieve plate (2), and a plurality of stirrers (203) are fixed to the outside of the threaded sleeve (202).

6. A continuous extraction tower for the production of thiophanate-methyl according to claim 5, characterized in that: A threaded rod (303) is fixed at a position corresponding to the top end of the lifting bracket (3) and the threaded sleeve (202), and the top end of the threaded rod (303) extends into the interior of the threaded sleeve (202).

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