Oxidation reaction kettle with filtering structure for producing phosphorus oxybromide

Abstract

The utility model discloses an oxidation reaction kettle with a filter structure for producing phosphorus oxybromide, which relates to the technical field of oxidation reaction kettles and comprises a reaction kettle body and a ceramic discharge valve, a detachable filter module is arranged between the reaction kettle body and the ceramic discharge valve and consists of a feed pipe, an inclined square pipe, a discharge pipe and a combined filter screen; the combined filter screen is made of polytetrafluoroethylene, is a square filter screen containing large holes and small holes, and can filter out large-particle impurities in the phosphorus oxybromide liquid to improve the purity; the square tube inclines to accumulate impurities along the net, so that cleaning is convenient; the round pipe joint and the threaded cover facilitate the disassembly and assembly of the net, and the threaded cover is provided with anti-skid threads; the discharging pipe is connected with the threaded cover through a branch pipe, a connecting pipe and a backflow hose, and various liquid flow paths are provided. The square tube or the tail end of the square tube is tempered glass, so that impurity accumulation can be observed conveniently, timely cleaning is facilitated, production interruption is reduced, equipment maintenance convenience and production efficiency are improved, and stable production operation is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of oxidation reactor technology, and in particular to an oxidation reactor for the production of phosphorus oxytribromide with a filtration structure. Background Technology

[0002] Phosphorus oxybromide plays an important role in the chemical industry, serving as a key raw material or intermediate in various organic synthesis reactions. It is widely used in the manufacturing processes of fine chemicals such as pharmaceuticals, pesticides, and flame retardants. In the production process of phosphorus oxybromide, the oxidation reaction is one of the core steps, usually carried out in a specific reactor. Currently, traditional oxidation reactors used in the production of phosphorus oxybromide have many shortcomings in the discharge process. Because some impurities are generated during the reaction, such as unreacted raw material particles and solid substances generated by side reactions, if these impurities are discharged directly with the product, it will affect the purity and quality of the phosphorus oxybromide product.

[0003] However, conventional reaction vessels lack effective preliminary filtration devices or only employ simple filtration methods, which are insufficient to meet the filtration requirements for phosphorus tribromooxyphosphorus, a substance with a certain degree of corrosiveness. For example, ordinary metal filter components are easily corroded when in contact with phosphorus tribromooxyphosphorus, leading to a decrease in filtration efficiency, equipment damage, and consequently affecting the continuity of production and the stability of product quality. To address the shortcomings of existing technologies, this paper proposes an oxidation reaction vessel with a filtration structure for the production of phosphorus tribromooxyphosphorus. Utility Model Content

[0004] The main objective of this invention is to provide an oxidation reactor for the production of phosphorus tribromooxyphosphorus with a filtration structure, which can effectively solve the problems in the background art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] An oxidation reactor for the production of phosphorus oxytribromide with a filtration structure includes a reactor body and a ceramic discharge valve. The inlet of the upper end of the ceramic discharge valve is connected to the discharge port at the lower end of the reactor body. A filtration module is detachably connected between the discharge port at the lower end of the reactor body and the inlet at the upper end of the ceramic discharge valve.

[0007] The filtration module mainly consists of a vertically arranged feed pipe, an inclined square tube, a vertically arranged discharge pipe, and a combined filter screen. The top end of the feed pipe is fixedly installed on the discharge port at the lower end of the reactor body, the lower end of the discharge pipe is fixedly installed on the inlet at the upper end of the ceramic discharge valve, the first end of the square tube is fixedly connected between the lower end of the feed pipe and the upper end of the discharge pipe, and the outer wall of the combined filter screen is fitted inside the square tube.

[0008] Preferably, the combined filter screen is mainly composed of two parallel side plates and parallel large-hole square filter screen and small-hole square filter screen. The large-hole square filter screen is disposed above the small-hole square filter screen. The two sides of the large-hole square filter screen and the small-hole square filter screen are respectively vertically fixed to the inner walls of the two side plates. The outer walls of the two side plates are respectively attached to the front and rear inner walls of the square tube cavity.

[0009] Preferably, the end of the square tube is fixedly connected to a round tube joint, the inner diameter of the round tube joint is not less than the diagonal length of the square cross section of the outer ring of the square tube, and the outer periphery of the round tube joint is coaxially threaded with a threaded cap, the inner bottom surface of the threaded cap and one side end face of the combined filter screen are in contact with each other.

[0010] Preferably, a branch pipe is vertically connected to one side of the lower end of the feed pipe, and a connecting pipe is coaxially fixed to the outer side of the threaded cap. The lower end of the connecting pipe is higher than the upper end of the branch pipe, and the inner diameter of the connecting pipe is smaller than the diagonal length of the square cross-section of the inner cavity of the square tube. A return hose is connected between the branch pipe and the connecting pipe.

[0011] Preferably, a first rectangular sealing plate and a second rectangular sealing plate are fixedly connected between the upper and lower ends of the two side plates, and the outer walls of the first rectangular sealing plate and the second rectangular sealing plate are respectively in contact with the upper and lower inner walls of the inner cavity of the square tube.

[0012] Preferably, a perforated mesh plate is fixedly connected between the first and last ends of the two side plates.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. Highly efficient filtration and impurity separation

[0015] The oxidation reactor for phosphorus oxybromide production equipped with a filtration structure is composed of a feed pipe with a specific structure, an inclined square tube, a discharge pipe, and a combined filter screen. The combined filter screen is made of polytetrafluoroethylene, which has excellent corrosion resistance and can effectively withstand the erosion of highly corrosive substances such as phosphorus oxybromide. It also has good chemical stability, can be used in a wide temperature range, and is not prone to aging or deformation. The double-layer setting of large-pore square filter screen and small-pore square filter screen is suitable for preliminary filtration, which can accurately filter out larger particulate impurities in phosphorus oxybromide liquid, effectively improving product purity. At the same time, the inclined square tube and the correspondingly inclined combined filter screen allow impurities to accumulate and gather downwards along the filter screen under the impact of liquid, facilitating the centralized collection and cleaning of impurities, further improving the efficiency of filtration and impurity separation, and ensuring the stability of the phosphorus oxybromide production process and product quality.

[0016] 2. Convenient maintenance and ease of operation

[0017] The square tube ends are connected to the threaded cap via a round tube connector. The inner diameter design of the round tube connector facilitates the disassembly and installation of the combined filter screen. The anti-slip grooves on the outer edge of the threaded cap facilitate manual operation, enabling quick and regular cleaning or replacement of the combined filter screen to ensure continuous and stable filtration performance. The feed pipe and the threaded cap are cleverly connected via branch pipes, connecting pipes, and return hoses, allowing the phosphorus oxybromide liquid to have multiple flow paths during filtration. This ensures the normal operation of the filtration function while providing greater flexibility for the operation of the entire reactor system. In addition, the square tube is made of tempered glass or has a tempered glass end, allowing operators to directly observe the accumulation of impurities inside the combined filter screen, thus determining the cleaning time in a timely manner and reducing the risk of production interruptions caused by filter screen clogging and other problems. This greatly improves the ease of maintenance of the production equipment and the overall production efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the filter module in this utility model;

[0020] Figure 3 This is a cross-sectional view of the filtering module in this utility model;

[0021] Figure 4 This is a schematic diagram of the filter module in this utility model;

[0022] Figure 5 This is a cross-sectional view of the filtering module in this utility model.

[0023] In the diagram: 1. Reactor body; 2. Ceramic discharge valve; 3. Filter module; 30. Feed pipe; 31. Square tube; 32. Threaded cap; 33. Return hose; 34. Discharge pipe; 35. Round pipe connector; 36. Connecting pipe; 37. Branch pipe; 38. Combined filter screen; 380. Side plate; 381. Large-hole square filter screen; 382. First rectangular sealing plate; 383. Small-hole connecting mesh plate; 384. Small-hole square filter screen; 385. Second rectangular sealing plate. Detailed Implementation

[0024] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0025] refer to Figures 1-5As shown, an oxidation reactor for the production of phosphorus tribromooxygenation with a filtration structure includes a reactor body 1. The reactor body 1 is the core container in the phosphorus tribromooxygenation process, used to contain the reactants and carry out oxidation reactions and other related processes. A ceramic discharge valve 2 is connected to the discharge port at the lower end of the reactor body 1. The ceramic material can adapt well to the phosphorus tribromooxygenation production environment and has a certain degree of corrosion resistance.

[0026] refer to Figure 1 , Figure 2 and Figure 3 A filter module 3 is connected between the discharge port at the lower end of the reactor body 1 and the inlet at the upper end of the ceramic unloading valve 2. The filter module 3 is mainly composed of a feed pipe 30, a square tube 31, a discharge pipe 34 and a combined filter screen 38.

[0027] refer to Figure 2 and Figure 3 The feed pipe 30 is set vertically, and its top end is fixedly installed on the discharge port at the lower end of the reactor body 1. It is the inlet channel for the phosphorus tribromooxygenate liquid to flow from the reactor into the filter module 3.

[0028] refer to Figure 3 The square tube 31 is inclined, with its first end fixedly connected to the lower end of the feed pipe 30 and the upper end of the discharge pipe 34, and its end fixedly connected to the round pipe joint 35. The inner diameter of the round pipe joint 35 is not less than the diagonal length of the square cross section of the outer ring of the square tube 31, which facilitates the disassembly and installation of the combined filter screen 38. The end of the square tube 31 or the entire square tube 31 is made of tempered glass, which makes it easy to observe the accumulation of impurities in the internal combined filter screen 38 for regular cleaning.

[0029] refer to Figure 2 and Figure 3 The discharge pipe 34 is set vertically, and its lower end is fixedly installed at the inlet of the ceramic discharge valve 2. It is the channel through which the phosphorus tribromooxyphosphorus liquid after preliminary filtration flows to the ceramic discharge valve 2. A branch pipe 37 is vertically connected to one side of its lower end.

[0030] refer to Figure 4 and Figure 5The combined filter screen 38 consists of two parallel side plates 380 and two parallel large-pore square filter screens 381 and 384. The large-pore square filter screen 381 has a pore diameter of approximately 0.85 mm and is positioned above the small-pore square filter screen 384. The small-pore square filter screen 384 has a pore diameter of approximately 0.3 mm. Both side plates 381 and 384 are vertically fixed to the inner walls of the two side plates 380. The outer walls of the side plates 380 are fitted against the inner walls of the front and rear sides of the square tube 31. A first rectangular sealing plate 382 and a second rectangular sealing plate 385 are fixedly connected between the upper and lower ends of the two side plates 380. The outer walls of the sealing plates 382 and 385 are fitted against the inner walls of the square tube 31. The inner side wall is fitted together, and small hole connecting mesh plates 383 are fixedly connected between the first and last ends. The hole diameter of the small hole connecting mesh plates 383 is about 0.3mm. The outer end face of the small hole connecting mesh plates 383 at the end is in contact with the inner bottom surface of the threaded cap 32. The four walls of the end of the combined filter screen 38 are in contact with the four inner walls of the square tube 31 and are interconnected with the inner cavity of the connecting tube 36 on the threaded cap 32. All components of the combined filter screen 38 are made of polytetrafluoroethylene material, which has excellent corrosion resistance and good chemical stability. It can be used in a wide temperature range and is not easy to age and deform. It is suitable for the preliminary filtration of phosphorus tribromooxyphosphine liquid and can filter out larger particulate impurities.

[0031] In this invention, during the production of phosphorus oxychloride, after the reaction is complete, the phosphorus oxychloride liquid in the reactor body 1 flows into the feed pipe 30 through the lower discharge port. Since the lower end of the feed pipe 30 is located to the left of the discharge pipe 34 and the top of the inlet of the discharge pipe 34 is higher than the lower end of the outlet of the feed pipe 30, and the combined filter screen 38 gradually slopes downwards from left to right, the liquid, after flowing out of the feed pipe 30, first contacts the filter module 3. Impurities in the liquid, under the impact of the liquid above, accumulate downwards along the inclined combined filter screen 38. The phosphorus oxychloride liquid mainly passes through the combined filter screen 38. The filter screen 38 flows upwards and backwards for a short period of time into the discharge pipe 34, or flows into the connecting pipe 36 along the inner cavity of the end of the combined filter screen 38, and then flows into the discharge pipe 34 through the return hose 33 connected to the connecting pipe 36, and finally is discharged through the ceramic discharge valve 2. The outer periphery of the round pipe joint 35 is coaxially threaded with a threaded cap 32. The inner bottom surface of the threaded cap 32 is in contact with one end face of the combined filter screen 38. Its outer anti-slip grooves facilitate manual disassembly and installation. The combined filter screen 38 can be cleaned or replaced regularly to ensure the filtration effect.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An oxidation reactor for the production of phosphorus oxytribromide with a filtration structure, comprising a reactor body (1) and a ceramic discharge valve (2), wherein the inlet of the upper end of the ceramic discharge valve (2) is connected to the discharge port at the lower end of the reactor body (1), characterized in that: A filter module (3) is detachably connected between the discharge port at the lower end of the reactor body (1) and the inlet at the upper end of the ceramic unloading valve (2); The filter module (3) is mainly composed of a vertically arranged feed pipe (30), an inclined square tube (31), a vertically arranged discharge pipe (34), and a combined filter screen (38). The top end of the feed pipe (30) is fixedly installed on the discharge port at the lower end of the reactor body (1). The lower end of the discharge pipe (34) is fixedly installed on the inlet at the upper end of the ceramic discharge valve (2). The first end of the square tube (31) is fixedly connected between the lower end of the feed pipe (30) and the upper end of the discharge pipe (34). The outer wall of the combined filter screen (38) is fitted inside the square tube (31).

2. The oxidation reactor for producing phosphorus oxybromide with a filtration structure according to claim 1, characterized in that: The combined filter screen (38) is mainly composed of two parallel side plates (380) and parallel large-hole square filter screen (381) and small-hole square filter screen (384). The large-hole square filter screen (381) is located above the small-hole square filter screen (384). The two sides of the large-hole square filter screen (381) and the small-hole square filter screen (384) are respectively vertically fixed to the inner walls of the two side plates (380). The outer walls of the two side plates (380) are respectively attached to the front and rear inner walls of the inner cavity of the square tube (31).

3. The oxidation reactor for producing phosphorus oxybromide with a filtration structure according to claim 1, characterized in that: The end of the square tube (31) is fixedly connected to a round tube joint (35). The inner diameter of the round tube joint (35) is not less than the diagonal length of the square cross section of the outer ring of the square tube (31). The outer periphery of the round tube joint (35) is coaxially threaded with a threaded cap (32). The inner bottom surface of the threaded cap (32) and one side end face of the combined filter screen (38) are in contact with each other.

4. The oxidation reactor for producing phosphorus oxybromide with a filtration structure according to claim 3, characterized in that: The lower end of the feed pipe (34) is vertically connected to a branch pipe (37), and the outer side of the threaded cap (32) is coaxially fixedly connected to a connecting pipe (36). The lower end of the connecting pipe (36) is higher than the upper end of the branch pipe (37). The inner diameter of the connecting pipe (36) is smaller than the diagonal length of the square cross section of the inner cavity of the square tube (31). A return hose (33) is connected between the branch pipe (37) and the connecting pipe (36).

5. The oxidation reactor for producing phosphorus oxybromide with a filtration structure according to claim 2, characterized in that: A first rectangular sealing plate (382) and a second rectangular sealing plate (385) are fixedly connected between the upper and lower ends of the two side plates (380). The outer walls of the first rectangular sealing plate (382) and the second rectangular sealing plate (385) are respectively in contact with the upper and lower inner walls of the inner cavity of the square tube (31).

6. The oxidation reactor for producing phosphorus oxybromide with a filtration structure according to claim 2, characterized in that: A perforated mesh plate (383) is fixedly connected between the two ends of the two side plates (380).

Images