Dehydration device for 3, 3 '-dichloro-4, 4'-diaminodiphenyl methane
By using a steam jacket and a stirring device in the dehydration kettle combined with a vacuum pump to evacuate, the problems of long dehydration time and large energy consumption in the prior art are solved, and the rapid and efficient dehydration effect is achieved, and the production cost is reduced.
Patent Information
- Application Number
- CN202422334190.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-24
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-09-24
AI Technical Summary
The dehydration process of the existing 3,3′-dichloro-4,4′-diaminodiphenylmethane consumes a long time and has a large energy consumption, which affects production efficiency and cost.
A dehydration kettle with steam jacket and a stirring device is adopted, combined with vacuum pump vacuum and evaporation dewatering plate sets to achieve uniform distribution and rapid dehydration of materials. The temperature is controlled through the steam jacket and the water vapor is absorbed in time to reduce steam and stir energy consumption.
It achieves rapid dehydration, reduces operating time, improves production efficiency, and reduces energy consumption and production costs.
Smart Images
Figure CN223144157U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of chemical production, and particularly relates to a dehydration device for 3,3'-dichloro-4,4'-diaminodiphenylmethane. Background Art
[0002] 3,3'-Dichloro-4,4'-diaminodiphenylmethane is a commonly used aromatic diamine chain extender, commonly known as MOCA. It can be used as a crosslinking agent and curing agent for polyurethanes and epoxy resins, a vulcanizing agent for rubber, and is used to prepare some products with relatively high electrical resistance properties, and is widely used in fields such as automobiles, machinery manufacturing, mining, and sports facilities. The existing synthesis process uses o-chloroaniline, formaldehyde, and hydrochloric acid as raw materials. First, o-chloroaniline reacts with hydrochloric acid to form o-chloroaniline hydrochloride, then condenses with formaldehyde to form MOCA hydrochloride, and then neutralizes the hydrochloric acid with liquid alkali. The product MOCA is obtained through steps such as washing, dehydration, and granulation. Among them, the dehydration process is the most important process before product forming (including liquid MOCA), and the dehydration effect directly affects the quality of the final product. The existing dehydration device, when operating, first uses a large amount of high-temperature steam to purge from the bottom of the kettle, and under the dual action of high temperature and pressure, brings out more moisture. However, due to the fact that the steam is essentially water, the moisture content in the material often exceeds the 0.1% standard; therefore, after purging, it is necessary to use vacuum distillation to remove the excess moisture; the purge steam pressure is required to be not less than 0.25 MPa, the purge time is usually 1.5 h to 2 h, and the subsequent vacuum distillation dehydration also requires about 1 h to 1.5 h. After dehydration is completed, a filtration operation of about 1.5 h is carried out. During this period, a large amount of steam is required for purging, and steam insulation is required for distillation and filtration. The above operations have the defects of long dehydration time and high energy consumption, seriously affecting production efficiency and increasing production costs. Summary of the Invention
[0003] The technical problem to be solved by the utility model is: aiming at the deficiencies existing in the prior art, to provide a dehydration device for 3,3'-dichloro-4,4'-diaminodiphenylmethane, which overcomes the defects of the prior art, has good dehydration effect, short dehydration time, low energy consumption, improves production efficiency, and reduces production costs.
[0004] To solve the above technical problem, the technical solution of the utility model is:
[0005] A dehydration device for 3,3'-dichloro-4,4'-diaminodiphenylmethane, comprising a kettle body of a dehydration kettle provided with a steam jacket and a stirring device. The stirring device includes a stirring motor arranged at the top of the kettle body and a hollow stirring shaft inside the kettle body. There is a connecting shaft between the stirring motor and the stirring shaft. A number of air-permeable holes are provided on the upper end, lower end and side wall of the stirring shaft (after water evaporates, it can be sucked away from the vacuum port through the air-permeable holes); on both sides of the stirring motor at the top of the kettle body, there are a feed port and a vacuum port; inside the kettle body, there are several groups of evaporation guide plate groups arranged from top to bottom. The evaporation guide plate group includes an upper guide plate and a lower guide plate arranged oppositely. The upper guide plate is fixedly connected to the stirring shaft, and the lower guide plate is connected to the side wall of the kettle body through a fastener; the bottom of the kettle body is connected to a temporary storage tank through a discharge port and a pipeline connecting the discharge port.
[0006] Preferably, the connecting shaft passes through the top of the kettle body and is connected to the stirring motor and the stirring shaft.
[0007] Preferably, the feed port is connected to the water washing device of the previous process through a pipeline, a feed regulating valve and a flow meter. A filtering device is also provided on the pipeline between the feed port and the water washing device.
[0008] Preferably, the vacuum port is connected to a vacuum pump through a pipeline. The steam generated in the kettle body is sucked away by the vacuum pump, and a certain negative pressure is formed to dehydrate and dry the materials in the kettle body.
[0009] Preferably, a ring-shaped guard plate is provided in the center of the upper part of the upper guide plate at the top of the stirring shaft. The guard plate is located between the side wall of the stirring shaft and the vacuum port / feed port. Ensure that the materials entering from the feed port will not flow back into the air-permeable holes at the top of the stirring shaft.
[0010] Preferably, a scraper adapted to the upper guide plate is provided on the upper surface of the upper guide plate at the top of the stirring shaft on one side of the feed port. The scraper is connected to the top of the kettle body through a connecting rod and a bolt. The entering materials are scraped flat and distributed relatively evenly on the upper guide plate to form a thin film for dehydration; the materials will slowly fall downward in sequence under the action of gravity and rotation, enter the lower guide plate and the next group of evaporation guide plate groups, so as to realize continuous dehydration and drying of the materials.
[0011] Preferably, 3 to 5 groups of the evaporation guide plate groups are provided.
[0012] Preferably, a steam outlet is provided at the upper part of the jacket, and a steam inlet is provided at the bottom; a steam pneumatic valve is provided at the steam inlet, and the steam inlet is connected to a steam supply device through a pipeline and the steam pneumatic valve.
[0013] Preferably, a temperature sensor and a first discharge pneumatic valve are provided at the discharge port.
[0014] Furthermore, the temperature sensor and the steam pneumatic valve are interlocked and controlled.
[0015] Preferably, a liquid level gauge and a second discharge pneumatic valve are provided in the temporary storage tank.
[0016] Furthermore, the liquid level gauge, the first discharge pneumatic valve, and the second discharge pneumatic valve are interlocked and controlled with each other.
[0017] Due to the adoption of the above technical solution, the beneficial effects of the present utility model are as follows:
[0018] The present utility model controls the temperature through a steam jacket, keeps the inside of the kettle under negative pressure by evacuating and timely sucks away water vapor, and evenly coats the material on the deflector through a scraper, realizing the operation of integrating purging and vacuum distillation. Compared with the operation in the prior art where purging and kettle-type vacuum distillation are carried out in two separate devices, it can more effectively remove moisture, reduce operation time, improve production efficiency; and reduce energy consumption such as steam and stirring. And the setting of the present utility model is convenient for disassembly, cleaning, and maintenance. Description of the Drawings
[0019] The present utility model will be further described below in conjunction with the drawings and embodiments.
[0020] Figure 1 is a schematic structural diagram of an embodiment of the present utility model;
[0021] Figure 2 is a top view obliquely above the upper deflector of an embodiment of the present utility model;
[0022] Figure 3 is a top view obliquely above the lower deflector of an embodiment of the present utility model;
[0023] Figure 4 is a schematic diagram (partial) of the three-dimensional structure of the lower deflector of an embodiment of the present utility model;
[0024] Figure 5 is a schematic structural diagram of the upper deflector of an embodiment of the present utility model;
[0025] In the figure, 1, kettle body; 2, stirring motor; 3, stirring shaft; 4, ventilation hole; 5, upper deflector; 6, lower deflector; 7, temporary storage tank; 8, guard plate; 9, scraper. Detailed Embodiments
[0026] The present utility model will be further elaborated below in conjunction with the drawings and embodiments.
[0027] As Figures 1 to 5As shown in the figure, a dehydration device for 3,3'-dichloro-4,4'-diaminodiphenylmethane includes a kettle body 1 of a dehydration kettle provided with a steam jacket (not marked) and a stirring device (not marked). The stirring device includes a stirring motor 2 arranged at the top of the kettle body 1 and a hollow stirring shaft 3 inside the kettle body 1. There is a connecting shaft (not marked) between the stirring motor and the stirring shaft. A number of air-permeable holes 4 are provided on the upper end, lower end and side wall of the stirring shaft 3 (part of the steam can be sucked away from the vacuum port through the air-permeable holes); on both sides of the stirring motor 2 at the top of the kettle body 1, there are a feed port (not marked) and a vacuum port (not marked); inside the kettle body 1, there are several groups of evaporation guide plate groups (not marked) arranged from top to bottom. The evaporation guide plate group includes an upper guide plate 5 and a lower guide plate 6 arranged oppositely. The upper guide plate 5 is fixedly connected to the stirring shaft 3, and the lower guide plate 6 is connected to the side wall of the kettle body 1 through a fastener (not marked); the bottom of the kettle body 1 is communicated with a temporary storage tank 7 through a discharge port (not marked) arranged below a first pneumatic valve (not marked) and a pipeline connecting the discharge port.
[0028] In the center of the upper part of the upper guide plate 5 at the top of the stirring shaft 3, there is an annular guard plate 8; on the upper guide plate 5 at the top of the stirring shaft 3 on one side of the feed port, there is a scraper 9 adapted to the upper guide plate 5.
[0029] When the utility model is actually applied, first, steam is introduced into the steam jacket to preheat the kettle body 1, and then the vacuum pump is started to pump vacuum through the vacuum port. The material to be dehydrated enters the filtering device through the regulating valve and flowmeter of the feed port for filtering, and then enters the kettle body 1 through the feed port, and falls onto the upper guide plate 5 of the evaporation guide plate group at the top of the stirring shaft 3. The upper guide plate 5 rotates driven by the stirring motor 2. The material is scraped by the scraper 9 to form a flowing film layer on the upper part of the upper guide plate 5, and slowly flows to the corresponding lower guide plate 6 under the action of its own gravity and rotation, and then flows to the next group of evaporation guide plate groups in turn until it enters the temporary storage tank 7 through the first discharge pneumatic valve at the discharge port. When the material flows through the evaporation guide plate group to form a flowing film layer, under the heat generated by the steam in the jacket of the kettle body 1 and the reduced pressure condition, the moisture in it is vaporized into steam and extracted through the vacuum port.
[0030] After the material reaches the set liquid level in the temporary storage tank 7, the first discharge pneumatic valve is interlocked and closed, and the second discharge pneumatic valve is opened. The material enters the next process for processing. After the liquid level in the temporary storage tank 7 drops to the lower limit, the second discharge pneumatic valve is closed, and the first discharge pneumatic valve is opened to continue to temporarily store the dehydrated material.
[0031] It should be understood that these embodiments are only used to illustrate the utility model and not to limit the scope of the utility model. In addition, it should be understood that after reading the content taught by the utility model, those skilled in the art can make various changes or modifications to the utility model, and these equivalent forms also fall within the scope defined by the appended claims of this application.
Claims
1. A dehydration device for 3,3'-dichloro-4,4'-diaminodiphenylmethane, characterized in that: It includes a kettle body of a dehydration kettle provided with a steam jacket and a stirring device. The stirring device includes a stirring motor arranged at the top of the kettle body and a hollow stirring shaft inside the kettle body. A connecting shaft is arranged between the stirring motor and the stirring shaft. A number of air permeable holes are provided on the upper end, lower end and the shaft wall on the side of the stirring shaft; on both sides of the stirring motor at the top of the kettle body, there are a feed inlet and a vacuum port; inside the kettle body, there are several groups of evaporation diversion plate groups arranged from top to bottom. The evaporation diversion plate group includes an upper diversion plate and a lower diversion plate arranged oppositely. The upper diversion plate is fixedly connected to the stirring shaft, and the lower diversion plate is connected to the side wall of the kettle body through a fastener; the bottom of the kettle body is communicated with a temporary storage tank through a discharge port and a pipeline connecting the discharge port.
2. The dehydration device for 3,3'-dichloro-4,4'-diaminodiphenylmethane according to claim 1, characterized in that: The connecting shaft passes through the top of the kettle body and is connected to the stirring motor and the stirring shaft.
3. The dehydration device for 3,3'-dichloro-4,4'-diaminodiphenylmethane according to claim 1, characterized in that: The feed inlet is communicated with a water washing device in the previous process through a pipeline, a feed regulating valve and a flowmeter. A filtering device is also provided on the pipeline between the feed inlet and the water washing device.
4. The dehydration device for 3,3'-dichloro-4,4'-diaminodiphenylmethane according to claim 1, characterized in that: The vacuum port is communicated with a vacuum pump through a pipeline.
5. The dehydration device for 3,3'-dichloro-4,4'-diaminodiphenylmethane according to claim 1, characterized in that: A ring-shaped guard plate is provided at the center of the upper part of the upper diversion plate at the top end of the stirring shaft.
6. The dehydration device for 3,3'-dichloro-4,4'-diaminodiphenylmethane according to claim 1, characterized in that: A scraper adapted to the upper diversion plate is provided on the upper surface of the upper diversion plate at the top end of the stirring shaft on one side of the feed inlet. The scraper is connected to the top of the kettle body through a connecting rod and a bolt.
7. The dehydration device for 3,3'-dichloro-4,4'-diaminodiphenylmethane according to claim 1, characterized in that: There are 3 to 5 groups of the evaporation diversion plate groups.
8. The dehydration device for 3,3'-dichloro-4,4'-diaminodiphenylmethane according to claim 1, characterized in that: A steam outlet is provided at the upper part of the jacket, and a steam inlet is provided at the bottom.
9. The dehydration device for 3,3'-dichloro-4,4'-diaminodiphenylmethane according to claim 1, wherein: A temperature sensor and a first discharge pneumatic valve are provided at the discharge port, and a liquid level gauge and a second discharge pneumatic valve are provided in the temporary storage tank.