A neutralization reaction device for 2-methyl-4-isothiazolin-3-one production

Abstract

The utility model relates to 2 - methyl - 4 - isothiazoline - 3 - ketone production technical field, especially a kind of neutralization reaction device for 2 - methyl - 4 - isothiazoline - 3 - ketone production, including body, the top of body is equipped with feed inlet and lye dropping tube, the bottom of body is equipped with discharge gate;The outside of body is equipped with jacket, the inside of body is equipped with cooling component being communicated with jacket;The inside of body is equipped with pH sensor and hollow structure's rotating shaft, rotating shaft rotates through driving device, and one end of rotating shaft is equipped with refrigerant inlet, and the other end of rotating shaft is equipped with refrigerant outlet;Rotating shaft is equipped with multiple first cooling and mixing components, second cooling and mixing components and third cooling and mixing components being communicated with rotating shaft, and the top of first cooling and mixing component is equipped with lye dispersion component;pH sensor is electrically connected controller.The neutralization reaction device of above structure, reasonable in design, avoid the decomposition of MIT and the occurrence of side reaction.

Description

Technical Field

[0001] This utility model relates to the field of 2-methyl-4-isothiazolin-3-one production technology, and in particular to a neutralization reaction apparatus for the production of 2-methyl-4-isothiazolin-3-one. Background Technology

[0002] 2-Methyl-4-isothiazolin-3-one (MIT) is a highly effective bactericide and preservative, exhibiting strong inhibitory and bactericidal effects against bacteria, fungi, molds, and algae. It is widely used in industrial cooling water, circulating water, papermaking, coatings, paints, rubber, leather, textiles, and oilfield water injection. In actual production, dithioamide is used as a raw material. After cyclization and oxidation with chlorine, the resulting MIT hydrochloride needs to be neutralized with an alkaline solution before separation and extraction to obtain the 2-methyl-4-isothiazolin-3-one product. During neutralization, the feed solution is affected by the pH and temperature of the alkaline solution. If the alkaline substance (such as NaOH solution) is added too quickly or without sufficient stirring, a sudden increase in local pH (creating an "overly alkaline zone") can occur in the reaction vessel, accelerating MIT decomposition and potentially triggering side reactions (such as solvent hydrolysis and residual raw material reactions). Excessive local temperature can lead to the decomposition of MIT. Current neutralization techniques often employ a jacketed neutralization vessel, adding the alkali solution all at once and using an anchor stirrer for mixing, which results in MIT decomposition and side reactions. Therefore, to address these issues, it is necessary to develop a neutralization reaction apparatus for the production of 2-methyl-4-isothiazolin-3-one. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a neutralization reaction device for the production of 2-methyl-4-isothiazolin-3-one, which reduces the decomposition of MIT and the occurrence of side reactions, and ensures the yield of neutralization reaction products.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0005] A neutralization reaction apparatus for the production of 2-methyl-4-isothiazolin-3-one includes a main body, with an inlet and an alkali dripping pipe at the top and an outlet at the bottom. The main body is surrounded by a jacket, and a cooling component connected to the jacket is located inside the main body. Inside the main body is a pH sensor and a hollow rotating shaft, which is driven to rotate. One end of the rotating shaft has a refrigerant inlet, and the other end has a refrigerant outlet. The rotating shaft is equipped with multiple first, second, and third cooling mixing components connected to it. An alkali dispersion component is located above the first cooling mixing component. The pH sensor is electrically connected to a controller.

[0006] As an improved technical solution, the cooling component is a plurality of hollow cooling plates.

[0007] As an improved technical solution, the first cooling mixing component and the third cooling mixing component include a hollow conical body, and the conical body is provided with a plurality of hollow mixing rods connected to the conical body.

[0008] As an improved technical solution, the second cooling mixing component includes a hollow fan-shaped plate with multiple rows of zigzag protrusions.

[0009] As an improved technical solution, the alkaline solution dispersion component includes a disc body, a baffle plate is provided around the disc body, multiple rows of liquid distribution holes are provided at the bottom of the disc body, and a stirring rod is provided between two adjacent rows of liquid distribution holes.

[0010] After adopting the above technical solution, the beneficial effects of this utility model are:

[0011] The neutralization reaction apparatus for the production of 2-methyl-4-isothiazolin-3-one includes a main body with an inlet and an alkali dripping pipe at the top and an outlet at the bottom. The main body is surrounded by a jacket, and a cooling component connected to the jacket is located inside. Inside the main body is a pH sensor and a hollow rotating shaft, which is driven to rotate. One end of the shaft has a refrigerant inlet, and the other end has a refrigerant outlet. The shaft has multiple first, second, and third cooling mixing components connected to it. An alkali dispersion component is located above the first cooling mixing component. The pH sensor is electrically connected to a controller. In actual production, the prepared 2-methyl-4-isothiazolin-3-one is transported into the main body. After the motor starts, it drives the rotating shaft and the first, second and third cooling and mixing components to stir the liquid inside the main body. The alkali solution is dripped into the main body through the metering pump along the alkali solution dripping pipe. The alkali solution is first dispersed by the alkali solution dispersion component and then neutralized with the liquid. The pH of the liquid is detected by pH detection. The refrigerant in the jacket enters the cooling component and enters the first, second and third cooling and mixing components along the rotating shaft, cooling the liquid at the same time, which greatly improves the cooling efficiency. In addition, the first, second and third cooling and mixing components stir and mix the liquid and alkali solution, promoting full contact reaction and uniform cooling, effectively avoiding the decomposition of high-temperature MIT and the occurrence of side reactions caused by excessive local pH fluctuations.

[0012] Because the cooling components consist of multiple hollow cooling plates, the refrigerant in the jacket enters the interior of the cooling plates along the connecting pipes, and then cools the liquid inside the main body, greatly improving the cooling efficiency.

[0013] The first and third cooling mixing components each include a hollow conical body with multiple hollow mixing rods connected to it. The refrigerant inside the rotating shaft enters the interior of the conical body and then the mixing rods. As the shaft rotates, it stirs, mixes, and cools the liquid inside the component, promoting the neutralization reaction.

[0014] The second cooling and mixing component includes a hollow fan-shaped plate with multiple rows of zigzag protrusions. The refrigerant inside the rotating shaft enters the fan-shaped plate, and as the shaft rotates, it stirs, mixes, and cools the liquid inside the main body. The zigzag protrusions increase the contact area between the liquid and the refrigerant, improving cooling efficiency.

[0015] The alkali dispersion component includes a disc body with baffles around its perimeter and multiple rows of distribution holes at the bottom. A stirring rod is positioned between adjacent rows of distribution holes. Under the action of a metering pump, the alkali solution falls onto the disc body through an alkali solution dropper, then disperses evenly through the distribution holes before contacting and reacting with the feed solution. The stirring rod, as the disc rotates, mixes the surrounding feed solution and alkali solution, significantly improving dispersion efficiency and preventing large local pH fluctuations. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the neutralization reaction apparatus for the production of 2-methyl-4-isothiazolin-3-one according to the present invention;

[0017] Among them, 1-body, 10-feed inlet, 11-alkali solution dripping pipe, 12-discharge outlet, 2-jacket, 3-cooling component, 4-pH sensor, 5-first cooling mixing component, 50-conical body, 51-mixing rod, 6-second cooling mixing component, 60-fan-shaped plate, 61-zigzag protrusion, 7-third cooling mixing component, 8-alkali solution dispersion component, 80-disc body, 81-baffle, 82-stirring rod, 9-controller, 13-gear, 14-connecting pipe, 15-connecting rod, 16-motor. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0019] A neutralization reaction apparatus for the production of 2-methyl-4-isothiazolin-3-one, such as Figure 1As shown, the device includes a main body 1, with an inlet 10 and an alkali dripping pipe 11 at the top and an outlet 12 at the bottom. The main body 1 has an outer jacket 2 and an inner cooling component 3 (multiple hollow cooling plates connected to the jacket 2 via a connecting pipe 14). Inside the main body 1 is a pH sensor 4 and a hollow rotating shaft 4. The rotating shaft 4 is driven by a drive device (including a motor 16, with gear 13 for transmission between the motor and the shaft). One end of the rotating shaft 4 has a refrigerant inlet 40 (connected to a refrigerant delivery pipe via a rotary joint), and the other end has a refrigerant outlet 41. The rotating shaft 4 is equipped with multiple first cooling and mixing components 5, second cooling and mixing components 6, and third cooling and mixing components connected to it. The cooling mixing component 7 includes an alkali dispersion component 8 (including a disc 80, which is welded to a rotating shaft, with baffles 81 around the disc 80, multiple rows of liquid distribution holes at the bottom of the disc 80, and stirring rods 82 between adjacent rows of liquid distribution holes) located above the first cooling mixing component 5. The first cooling mixing component 5 and the third cooling mixing component 7 include a hollow conical body 50 (connected to the rotating shaft via a hollow connecting rod 15), with multiple hollow mixing rods 51 connected to the conical body 50. The second cooling mixing component 6 includes a hollow fan-shaped plate 60 (connected to the rotating shaft via a hollow connecting rod 15), with multiple rows of zigzag protrusions 61 on the fan-shaped plate. The pH sensor 4 is electrically connected to the controller 9.

[0020] In actual production, the prepared 2-methyl-4-isothiazolin-3-one is transported into the main body. After the motor starts, it drives the rotating shaft and the first, second, and third cooling and mixing components to stir the liquid inside the main body. The alkali solution is dripped into the main body through the metering pump along the alkali solution dripping pipe. The alkali solution first falls onto the disk of the alkali solution dispersion component through the alkali solution dripping pipe, and then passes through the liquid distribution holes to be evenly dispersed and react with the liquid. The stirring rod stirs and mixes the surrounding liquid and alkali solution as the disk rotates, which greatly improves the dispersion efficiency and avoids the phenomenon of large local pH fluctuations. The alkali solution and the liquid undergo a neutralization reaction. The pH of the liquid is detected by pH detection. The refrigerant in the jacket enters the interior of multiple cooling plates through the connecting pipe. Some of the refrigerant enters the first, second, and third cooling mixing components along the rotating shaft under the action of the delivery pump. The third cooling mixing component's cone-shaped body then enters the mixing rod's interior. As the shaft rotates, it stirs, mixes, and cools the liquid inside, promoting the neutralization reaction. Part of the refrigerant enters the fan-shaped plate of the second cooling mixing component. As the shaft rotates, it stirs, mixes, and cools the liquid inside. The zigzag protrusion design increases the contact area between the liquid and the refrigerant, stirring, mixing, and cooling the surrounding liquid, further promoting the neutralization reaction. The first, second, and third cooling mixing components work together to stir and mix the liquid, ensuring full contact and reaction between the liquid and the alkali solution. This also ensures uniform cooling, greatly improving cooling efficiency and effectively preventing the decomposition of high-temperature MIT and side reactions caused by excessive local pH fluctuations.

[0021] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A neutralization reaction apparatus for the production of 2-methyl-4-isothiazolin-3-one, characterized in that, The device includes a main body, with an inlet and an alkali dripping tube at the top and an outlet at the bottom. The main body has an external jacket and an internal cooling component connected to the jacket. Inside the main body is a pH sensor and a hollow rotating shaft, which rotates via a drive device. One end of the shaft has a refrigerant inlet, and the other end has a refrigerant outlet. The rotating shaft has multiple first, second, and third cooling mixing components connected to it. An alkali dispersion component is located above the first cooling mixing component. The pH sensor is electrically connected to a controller.

2. The neutralization reaction apparatus for the production of 2-methyl-4-isothiazolin-3-one according to claim 1, characterized in that, The cooling component consists of multiple hollow cooling plates.

3. The neutralization reaction apparatus for the production of 2-methyl-4-isothiazolin-3-one according to claim 1, characterized in that, The first cooling mixing component and the third cooling mixing component include a hollow cone-shaped body, and the cone-shaped body is provided with a plurality of hollow mixing rods connected to the cone-shaped body.

4. The neutralization reaction apparatus for the production of 2-methyl-4-isothiazolin-3-one according to claim 1, characterized in that, The second cooling mixing component includes a hollow fan-shaped plate with multiple rows of zigzag protrusions.

5. The neutralization reaction apparatus for the production of 2-methyl-4-isothiazolin-3-one according to claim 1, characterized in that, The alkaline solution dispersion component includes a disc body, a baffle plate is provided around the disc body, and multiple rows of liquid distribution holes are provided at the bottom of the disc body, with a stirring rod provided between two adjacent rows of liquid distribution holes.

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