CN216172330U - A kind of neutralization reactor for naphthalene continuous nitration process - Google Patents

Abstract

The utility model discloses a neutralization reaction kettle for a naphthalene continuous nitration process, which comprises a neutralization kettle, wherein a plurality of support columns are fixed at the bottom of the neutralization kettle, a sealing cover plate is hermetically abutted against the inner wall of the upper end of the neutralization kettle, a material injection pipe is inserted through the upper end of the sealing cover plate, a baffle is fixed on the inner wall of the neutralization kettle, a through groove is penetratingly arranged at the upper end of the baffle, the material injection pipe is abutted against the inner wall of the through groove, and a mixing device and a discharging device are arranged inside the neutralization kettle. In this device, through setting up mixing arrangement, can realize the intensive mixing of raw materials and additive to make neutralization can go on fast, rotate the in-process at the stirring board simultaneously, can make the scraper blade along the rotation of neutralization cauldron inner wall, thereby can realize scraping off neutralization cauldron inner wall adnexed solution to solution mixing process, can avoid the adnexed of solution, can guarantee the utilization ratio of solution, also can be convenient for simultaneously and subsequently wash the neutralization cauldron.

Description

A kind of neutralization reactor for naphthalene continuous nitration process

technical field

The utility model relates to the technical field of chemical production equipment, in particular to a neutralization reaction kettle for a continuous nitration process of naphthalene.

Background technique

Aromatic nitration is a classic organic synthesis reaction. The preparation of 1-nitronaphthalene can be achieved by the nitration of naphthalene. 1-nitronaphthalene is an important intermediate for the synthesis of medicines, dyes, pesticides, rubber antioxidants, etc. It has important and extensive applications in industry, and 1-nitronaphthalene generally needs to use a neutralization reactor to neutralize the solution in the production process;

In the traditional neutralization reactor, the separation of the precipitate will drive the outflow of the neutralized solution, which will cause great trouble to the solid-liquid separation after the reaction, and the solution will be adsorbed in the neutralization reaction during the neutralization process. The inner wall of the kettle will cause great trouble to the cleaning of the neutralization reactor, and will also cause the loss of the solution, which will reduce the utilization rate of resources. Therefore, we need to design a continuous nitrification process for naphthalene that is easy to clean the attachments. and reactor.

Utility model content

The purpose of this utility model is to solve the shortcomings of the solution adhesion and the inner wall of the neutralization kettle in the prior art, and propose a neutralization reaction kettle for the continuous nitration process of naphthalene.

In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

A neutralization reaction kettle for a continuous nitration process of naphthalene includes a neutralization kettle, a plurality of support columns are fixed at the bottom of the neutralization kettle, and a sealing cover plate is provided on the inner wall of the upper end of the neutralization kettle. A material injection pipe is inserted through the upper end of the plate, a baffle plate is fixed on the inner wall of the neutralization kettle, a through groove is formed through the upper end of the baffle plate, and the material injection pipe is in contact with the inner wall of the through groove, and the middle A feeding hopper is inserted into the side wall of the neutralization kettle, and a mixing device and a discharging device are arranged inside the neutralization kettle.

Preferably, the discharging device includes a screening groove running through the inner wall of one side of the neutralization kettle, one end of the inner wall of the screening groove is fixed with a sieve plate, and the other end of the inner wall of the screening groove is fixed with a circulation pipe.

Preferably, a discharge pipe is inserted through the inner wall of the other side of the neutralization kettle, the discharge pipe and the flow pipe are symmetrically arranged, and the inner bottom of the neutralization kettle is in the shape of a truncated cone.

Preferably, the mixing device includes a motor fixed on the bottom of the neutralization kettle, the main shaft of the motor penetrates the inner bottom of the neutralization kettle and a rotating shaft is fixed, and the upper end of the rotating shaft is in contact with the bottom of the baffle plate.

Preferably, the ends of the scrapers are arc-shaped, the ends of each scraper are in contact with the inner wall of the neutralization kettle, and a plurality of the stirring plates are arranged at equal distances.

Compared with the prior art, the advantages of the present utility model are:

1. In this device, by setting a sieve plate inside the screening tank, the sediment can be blocked, so that the outflow of the solution can be realized, and the discharge pipe at the other end is used to realize the discharge of the sediment, and the scraper is in contact with the sieve plate. , the impurities on the sieve plate can be scraped off by the rotating scraper, so as to ensure the permeability of the sieve plate, so that the outflow efficiency of the solution is higher, so that the solid-liquid separation of the neutralized material can be more convenient;

2. In this device, by setting up a mixing device, the raw materials and additives can be fully mixed, so that the neutralization can be carried out quickly. Therefore, the solution adhering to the inner wall of the neutralization kettle can be scraped off during the solution mixing process, the adhesion of the solution can be avoided, the utilization rate of the solution can be ensured, and the subsequent cleaning of the neutralization kettle can also be facilitated.

Description of drawings

Fig. 1 is the structural representation of a kind of naphthalene continuous nitration process that the utility model proposes to use neutralization reactor;

Fig. 2 is the top sectional view of the neutralization reactor for a kind of naphthalene continuous nitration process proposed by the utility model;

FIG. 3 is an enlarged view of part A in FIG. 1 .

In the picture: 1 neutralization kettle, 2 support columns, 3 sealing cover, 4 injection pipes, 5 baffles, 6 through grooves, 7 feed hoppers, 8 screening grooves, 9 sieve plates, 10 flow pipes, 11 discharge Tube, 12 motors, 13 shafts, 14 stirring plates, 15 scrapers, 16 stirring rods.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the implementations. example.

Referring to Fig. 1-3, a kind of neutralization reactor for continuous nitration of naphthalene includes neutralization still 1, a plurality of support columns 2 are fixed at the bottom of neutralization still 1, and the inner wall of the upper end of neutralization still 1 is sealed against each other with a sealing cover. Plate 3, the upper end of the sealing cover plate 3 is inserted with a feeding pipe 4, the inner wall of the neutralization kettle 1 is fixed with a baffle 5, and the upper end of the baffle 5 is provided with a through groove 6, the feeding pipe 4 and the through groove 6 The inner wall of the neutralization kettle 1 is inserted into a feeding hopper 7, and the interior of the neutralization kettle 1 is provided with a mixing device and a discharging device.

The discharging device includes a screening groove 8 running through the inner wall of one side of the neutralization kettle 1, one end of the inner wall of the screening groove 8 is fixed with a sieve plate 9, and the other end of the inner wall of the screening groove 8 is fixed with a circulation pipe 10, and the sieve plate 9 is close to the neutralization. Inside the kettle 1; a discharge pipe 11 is inserted through the inner wall of the other side of the neutralization kettle 1, and the discharge pipe 11 is arranged symmetrically with the circulation pipe 10. The sieve plate 9 is provided to block the sediment, so that the outflow of the solution can be realized, and the discharge pipe 11 at the other end is used to realize the discharge of the sediment, and the scraper 15 is in contact with the sieve plate 9. 15. Scrape off the impurities on the sieve plate 9, so as to ensure the permeability of the sieve plate 9, so that the outflow efficiency of the solution is higher, so that the solid-liquid separation of the neutralized material can be more convenient.

The mixing device includes a motor 12 fixed at the bottom of the neutralization kettle 1, the main shaft of the motor 12 runs through the inner bottom of the neutralization kettle 1 and is fixed with a rotating shaft 13, the upper end of the rotating shaft 13 is in contact with the bottom of the baffle plate 5; the circumferential side wall of the rotating shaft 13 A plurality of stirring plates 14 are fixed, the side wall of each stirring plate 14 is fixed with a scraper 15, the upper end of each stirring plate 14 is fixed with a stirring rod 16, and the scraper 15 is in contact with the end of the sieve plate 9; The ends of 15 are arc-shaped, and the ends of each scraper 15 are in contact with the inner wall of the neutralization kettle 1. A plurality of stirring plates 14 are arranged at equal distances. The plurality of stirring plates 14 can be divided into three groups. The height decreases sequentially from top to bottom, which can realize the complete contact between the scraper 15 and the inner wall of the neutralization kettle 1 under the driving of the motor 12, so that the solution attached to the inner wall of the neutralization kettle 1 can be scraped off during the solution mixing process. The adhesion of the solution can be avoided, the utilization rate of the solution can be ensured, and the subsequent cleaning of the neutralization kettle 1 can also be facilitated.

In the present invention, during the use of the neutralization kettle 1, by aligning the positions of the material injection pipe 4 and the through groove 6 on the baffle 5, the sealing cover plate 3 is sealed against the upper end of the neutralization kettle 1, and then the circulation The pipe 10 and the discharge pipe 11 are closed, and the acid nitrate after nitrification and pre-washing is injected along the feeding pipe 4, and the soda ash solution is added along the feeding hopper 7, so that the soda ash solution can be mixed with the acid nitrate, and the soda ash can be used. The reaction between the solution and the acid nitrate realizes the neutralization of the solution, which can neutralize the acid;

At the same time, after the soda ash solution is injected, by starting the motor 12, the main shaft of the motor 12 can drive the rotating shaft 13 to rotate, so that a plurality of stirring plates 14 and stirring rods 16 can be rotated along with the rotating shaft 13. Stirring can realize the full mixing of raw materials and additives, so that the neutralization can be carried out quickly, and the time consumed by the neutralization reaction can be greatly reduced, so as to facilitate the production efficiency of the factory. The rotation of the scraper 15 along the inner wall of the neutralization kettle 1 can realize the scraping of the solution attached to the inner wall of the neutralization kettle 1 during the solution mixing process, which can avoid the adhesion of the solution and ensure the utilization rate of the solution. It can facilitate the subsequent cleaning of the neutralization kettle 1;

After the neutralization reaction is completed, by opening the flow pipe 10, the solution in the neutralization kettle 1 can flow out along the sieve plate 9 and the sieve tank 8, and after the solution has completely flowed out, the discharge pipe 11 is opened to remove Driven by the plate 15, it is convenient for the sediment to be discharged along the discharge pipe 11, so as to facilitate the solid-liquid separation after neutralization, and facilitate the subsequent processing of the solution. The plate 15 scrapes off the impurities on the sieve plate 9, so as to ensure the permeability of the sieve plate 9, so that the outflow efficiency of the solution is higher, which can make the solid-liquid separation of the neutralized material more convenient, and can effectively ensure the chemical industry. Product production efficiency.

The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited to this. Equivalent replacement or modification of the new technical solution and its utility model concept shall be included within the protection scope of the present utility model.

Claims (6)

1. a neutralization reactor for continuous nitration of naphthalene, comprising neutralization reactor (1), it is characterized in that, the bottom of described neutralization reactor (1) is fixed with a plurality of support columns (2), the neutralization The inner wall of the upper end of the kettle (1) is sealed against a sealing cover plate (3), the upper end of the sealing cover plate (3) is inserted with a material injection pipe (4), and the inner wall of the neutralization kettle (1) is fixed with a A baffle (5), the upper end of the baffle (5) is provided with a through groove (6), the material injection pipe (4) is in contact with the inner wall of the through groove (6), and the neutralization kettle (1) A feeding hopper (7) is inserted into the side wall of the neutralization kettle (1), and a mixing device and a discharging device are arranged inside the neutralization kettle (1). 2. a kind of naphthalene continuous nitration process neutralization reactor according to claim 1, is characterized in that, described discharging device comprises the screening groove (8) that runs through and is opened in the inner wall of one side of neutralization kettle (1), One end of the inner wall of the screening tank (8) is fixed with a screen plate (9), and the other end of the inner wall of the screening tank (8) is fixed with a circulation pipe (10). 3. a kind of naphthalene continuous nitration process neutralization reactor according to claim 2, is characterized in that, the other side inner wall of described neutralization still (1) is inserted with discharge pipe (11) through, so The discharge pipe (11) and the flow pipe (10) are symmetrically arranged, and the inner bottom of the neutralization kettle (1) is in the shape of a truncated cone. 4. The neutralization reaction kettle for a continuous nitration process of naphthalene according to claim 1, wherein the mixing device comprises a motor (12) fixed at the bottom of the neutralization kettle (1), and the motor (12) ) of the main shaft penetrates through the inner bottom of the neutralization kettle (1) and is fixed with a rotating shaft (13), the upper end of the rotating shaft (13) is in contact with the bottom of the baffle plate (5). 5. The neutralization reactor for a continuous nitration process of naphthalene according to claim 4, wherein a plurality of stirring plates (14) are fixed on the circumferential side wall of the rotating shaft (13), and each of the A scraper (15) is fixed on the side wall of the stirring plate (14), and a stirring rod (16) is fixed on the upper end of each stirring plate (14). 6. The neutralization reactor for continuous nitration of naphthalene according to claim 5, wherein the end of the scraper (15) is arc-shaped, and the end of each scraper (15) All are in contact with the inner wall of the neutralization kettle (1), and a plurality of the stirring plates (14) are arranged at equal distances.

Images