A detachable multi-section independent preheating pipe type reactor

Abstract

The utility model discloses a detachable multistage independent preheating pipe type reactor relates to industrial reactor technical field, and the box is divided into first cavity and second cavity through the partition, and the top is equipped with the feed pump conveying slurry, and the filter system adopts 50um stainless steel wire mesh filter plate and 10um active carbon fiber filter element and realizes two -stage filtration, and the pretreatment system is built -in 316L stainless steel spiral pipe and cooperates aluminium silicate heat preservation layer, and makes solution even preheating to 80 90 DEG C, and the multistage reaction system is composed of the glass steel reaction box of 5 flange connection, and the volume is 100L per section, and realizes the controllable reaction of stage by the bend pipe series connection, and the steam circulation system is heated through 0.3 0.5MPa high pressure steam, and cooperates branch pipeline and recovery mouth and realizes the step -by -step utilization of heat energy. The device realizes quick dismounting maintenance through modularization design, and combines accurate temperature control and high -efficient filtration, and the reaction efficiency and product purity are improved significantly, and the steam circulation structure reduces energy consumption by more than 25%, and is suitable for continuous industrial production scene.

Description

Technical Field

[0001] This utility model relates to the field of industrial reactor technology, specifically to a detachable multi-section independent preheating tubular reactor. Background Technology

[0002] In the field of chemical production, bromination is a key organic synthesis reaction widely used in the synthesis of intermediates in industries such as pharmaceuticals, pesticides, and dyes. However, traditional tubular reactors have revealed several technical bottlenecks in bromination reactions, limiting their efficiency and flexibility.

[0003] First, preheating efficiency and temperature uniformity are insufficient. Existing reactors mostly employ a single-stage preheating design, causing the solution to heat up rapidly in a short time. This easily leads to uneven temperature distribution, resulting in localized overheating or underheating, directly affecting the reaction rate and the selectivity of the target product. For example, in the bromination reaction of dibromohydantoin and p-fluorobenzaldehyde, the temperature needs to be precisely controlled between 80 and 130 degrees Celsius, a requirement that is clearly difficult to achieve with a single-stage preheating structure.

[0004] Secondly, the maintenance and adaptability of the reaction system are poor. Traditional tubular reactors typically employ a fixed connection design for the reaction section, integrating the reaction tank with the piping. This not only increases the difficulty of equipment cleaning but also prevents flexible adjustment of the number of reaction sections and reaction conditions according to production needs. For complex processes requiring multi-step bromination reactions or segmented temperature control, the adaptability of existing equipment is particularly inadequate.

[0005] Furthermore, challenges exist in controlling solution purity. The raw material slurry may contain undissolved solid impurities (such as dibromohydantoin crystals) or trace organic matter (such as catalyst residues), while existing filtration systems mostly employ low-precision single-stage filtration (such as filter cartridges with a precision of more than 20 microns), which is insufficient to meet the requirements for producing high-purity brominated products (with a purity requirement of more than 98.5%).

[0006] In conclusion, although bromination plays a crucial role in chemical production, traditional tubular reactors still have significant room for improvement in areas such as preheating efficiency, reaction system flexibility, energy utilization, and solution purity control. Future technological development should focus on addressing these bottlenecks to drive chemical production towards greater efficiency, environmental friendliness, and higher quality. Utility Model Content

[0007] In view of this, the present invention provides a detachable multi-section independent preheating tubular reactor to solve the above technical problems.

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] A detachable multi-section independent preheating tubular reactor includes a housing, a filtration system, a pretreatment system, a multi-stage reaction system, and a steam circulation heating system;

[0010] The box is divided into a first chamber and a second chamber by a partition. A feed pump is installed on the top of the first chamber to transport slurry to the filtration system.

[0011] The filtration system includes a filter box and a secondary filter. The filter box is equipped with an inclined filter plate. The secondary filter is connected to the filter box through a pipe for two-stage filtration.

[0012] The pretreatment system includes a pretreatment box containing a spiral tube. The upper end of the spiral tube is connected to the first conveying pipe of the filtration system, and the lower end is connected to the multi-stage reaction system through a second conveying pipe.

[0013] The multi-stage reaction system consists of multiple reaction tanks connected in series by a bent pipe with flanges. The lowest reaction tank receives the preheated solution, and the highest reaction tank is connected to the liquid outlet pipe.

[0014] The steam circulation heating system includes a heater, a booster pump, and branch pipelines, used to deliver steam to the pretreatment tank and the second cavity, and to achieve heat energy circulation through the recovery port.

[0015] Furthermore, the filter plate is a stainless steel wire mesh with a pore size of 50μm and an inclination angle of 15° to 30°; the secondary filter uses an activated carbon fiber filter element with a filtration accuracy of 10μm.

[0016] Furthermore, the spiral tube is made of 316L stainless steel, with an outer diameter of 32mm, a pitch of 100mm, and a total length of 15m; the inner wall of the pretreatment box is lined with a 50mm thick aluminum silicate insulation board.

[0017] Furthermore, the reaction chamber is made of fiberglass, with a polytetrafluoroethylene coating on the inner wall, and has a volume of 100L; the flanges at both ends of the bend adopt the PN10 DN50 standard, and the sealing gaskets are made of polytetrafluoroethylene.

[0018] Furthermore, in the steam circulation heating system:

[0019] The steam outlet pressure of the heater is 0.3-0.5 MPa, and the temperature is 150-180℃;

[0020] The booster pump has a flow rate of 200 kg / h. The first branch pipe and the second branch pipe are respectively connected to the first inlet of the pretreatment box and the second inlet of the second chamber.

[0021] The steam recovery port is connected to the first outlet of the pretreatment box and the second outlet of the second chamber through the third and fourth branch pipes, respectively.

[0022] Furthermore, the multi-stage reaction system has 5 reaction chambers with a vertical spacing of 200mm. The reaction time for each section is controlled at 1.5 hours, and the reaction temperature is maintained at 120-130℃.

[0023] Furthermore, the preheating temperature of the spiral tube of the pretreatment system is 80-90℃, and the preheated solution enters the lowest reaction chamber through the second delivery pipe.

[0024] Furthermore, the feed pump is a centrifugal pump with a flow rate range of 500-1000 L / h, used to transport a slurry composed of dibromohydantoin, benzyltriethylammonium chloride, sulfuric acid, and p-fluorobenzaldehyde.

[0025] As can be seen from the above technical solution, the advantages of this utility model are:

[0026] 1. High-efficiency two-stage filtration ensures reaction purity.

[0027] The combined filtration system, consisting of a 50μm stainless steel wire mesh filter plate and a 10μm activated carbon fiber filter element, can remove impurities of different particle sizes from the slurry in stages, significantly reducing the risk of solid particles and organic matter contamination in the reaction system, ensuring the high purity of subsequent reaction raw materials, and improving the quality of the final product.

[0028] 2. The spiral preheating structure improves thermal energy utilization.

[0029] The 316L stainless steel spiral tube (15m in total length, 100mm pitch) inside the pretreatment chamber, combined with the aluminum silicate insulation layer, ensures that the solution is heated evenly during the flow process, improving the preheating efficiency by more than 30%. At the same time, the 50mm thick insulation layer reduces heat loss, and the precise preheating temperature of 80-90℃ provides a stable heat source for multi-stage reactions, reducing overall energy consumption.

[0030] 3. Modular reaction systems enhance flexibility.

[0031] The 5-section fiberglass reaction chamber (100L / section) connected by flanges can be quickly disassembled and maintained. The 200mm vertical spacing facilitates observation of the reaction status of each section. The controllable reaction time of 1.5 hours for each section and constant temperature control of 120-130℃ enable precise staged reactions, increasing product yield by 15%-20%. The number of reaction sections can be increased or decreased according to process requirements.

[0032] 4. The steam circulation system achieves energy saving and consumption reduction.

[0033] High-pressure steam of 0.3-0.5MPa is distributed to the pretreatment tank and the second chamber by a booster pump. The heat energy is utilized in stages through a branch pipeline design. The waste heat steam is reintroduced into the heater for circulation through the recovery port. The overall thermal efficiency is improved by 25%, and the annual steam cost of a single unit is reduced by about 120,000 yuan, which meets the requirements of green manufacturing. Attached Figure Description

[0034] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0035] Figure 1 This is a cross-sectional view of the overall structure of this utility model.

[0036] Figure 2 This is a cross-sectional view of the pretreatment box of this utility model.

[0037] Figure 3 For the present utility model Figure 2 A magnified view of a portion at point A.

[0038] Figure 4 This is a schematic diagram showing the relationship between two adjacent reaction tanks and the bend pipe connected by flanges according to this utility model.

[0039] Figure 5 This is a cross-sectional view of the filter box of this utility model.

[0040] Figure 6 This is a schematic diagram of the steam outlet and steam recovery port of the heater of this utility model and the structure of the heater body.

[0041] Explanation of reference numerals in the attached figures:

[0042] 1-Box body; 11-Feed pump; 12-Baffle plate; 13-Liquid outlet pipe; 14-First cavity; 15-Second cavity; 21-Filter box; 211-Filter plate; 22-Pass pipe; 23-First conveying pipe; 3-Pretreatment box; 32-Spiral pipe; 33-Second conveying pipe; 34-Insulation board; 35-Preheating shell; 36-First inlet; 37-First outlet; 4-Bend pipe; 51-Reaction box; 52-Second inlet; 53-Second outlet; 6-Filter; 8-Heater; 81-Booster pump; 82-Steam outlet; 83-First branch pipe; 84-Second branch pipe; 85-Third branch pipe; 86-Steam recovery port; 87-Fourth branch pipe. Detailed Implementation

[0043] 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 embodiments and accompanying drawings. Here, the illustrative embodiments and descriptions of this utility model are used to explain the present utility model, but are not intended to limit the present utility model.

[0044] refer to Figures 1 to 6 ,like Figure 1As shown, this embodiment provides a detachable multi-section independent preheating tubular reactor, whose structure includes a housing 1, a filtration system, a pretreatment system, a multi-stage reaction system, and a steam circulation heating system. These systems work together to achieve efficient bromination of the solution. The structure and working principle of each part are described in detail below with reference to the accompanying drawings:

[0045] I. Structural Composition

[0046] 1. Box 1

[0047] The housing 1 is made of 304 stainless steel with an outer wall thickness of 8mm. Internally, it is divided into a first chamber 14 and a second chamber 15, arranged left and right, by a partition 12. The partition 12 is 10mm thick and coated with a corrosion-resistant coating. A feed pump 11 is installed on the top of the first chamber 14. The feed pump 11 is a centrifugal pump with a flow rate range of 500-1000L / h, used to transport the stirred slurry.

[0048] The output end of the feed pump 11 is connected to the filtration system and is used to transport the stirred slurry (prepared by uniformly mixing dibromohydantoin, benzyltriethylammonium chloride, sulfuric acid and p-fluorobenzaldehyde in proportion) to the reactor.

[0049] 2. Filtration system

[0050] like Figure 1 and Figure 5 As shown, the filtration system includes a filter box 21 and a secondary filter 6. The filter box 21 is fixed to the top wall inside the first cavity 14, and has a filter plate 211 inside for preliminary filtration of the slurry. The filter box 21 is made of polypropylene (PP) and has a volume of 200L.

[0051] Preferably, the filter plate 211 is a stainless steel wire mesh with a pore size of 50μm, and is installed at an angle to facilitate the discharge of impurities. The angle of inclination is 15° to 30°.

[0052] The bottom of the filter box 21 is connected to the secondary filter 6 via a connecting pipe 22, achieving two-stage fine filtration. The filter 6 is fixed to the inner top wall of the first chamber 14. The output end of the secondary filter 6 is connected to the first delivery pipe 23, which transports the filtered solution to the pretreatment system. The secondary filter 6 uses an activated carbon fiber filter element with a filter accuracy of 10μm and a filtration area of ​​0.5m². The secondary filter 6 is fixed to the right side of the filter box 21 and is connected to the filter box 21 via the connecting pipe 22. The connecting pipe 22 has an inner diameter of 50mm and is made of PVC.

[0053] 3. Preprocessing system

[0054] like Figure 1 , Figure 2 and Figure 3As shown, the pretreatment system includes a pretreatment box 3, which is fixed to the bottom of the first cavity 14. The pretreatment box 3 consists of a preheating shell 35 and a spiral tube 32.

[0055] The preheating shell 35 is cylindrical with a diameter of 800mm and a height of 1200mm. It is made of carbon steel and the inner wall is lined with a 50mm thick aluminum silicate insulation board 34 to reduce heat loss.

[0056] The spiral tube 32 is placed in the preheating shell 35 in a spiral shape. Its upper end is connected to the first conveying pipe 23, and its lower end is connected to the lowest reaction box 51 of the multi-stage reaction system through the second conveying pipe 33.

[0057] The spiral tube 32 is made of 316L stainless steel, with an outer diameter of 32mm, a wall thickness of 2mm, a pitch of 100mm, and a total length of 15m.

[0058] The second delivery pipe 33 has an inner diameter of 40mm and extends to the lowest reaction chamber 51.

[0059] The pretreatment system preheats the solution flowing through the spiral tube 32 using a steam circulation heating system, thereby improving the reaction efficiency.

[0060] 4. Multi-stage reaction system

[0061] like Figure 1 and Figure 4 As shown, the multi-stage reaction system includes multiple equidistantly arranged reaction chambers 51, which are sequentially connected by outer bends 4. Flanges of PN10 DN50 specification are provided at both ends of the bends 4 and the outer ends of the reaction chambers 51. These flanges are secured with flange bolts for detachable connection, facilitating maintenance and replacement. The outlet of the uppermost reaction chamber 51 is connected to a liquid outlet pipe 13 for discharging the reaction product; the lowermost reaction chamber 51 is connected to a second delivery pipe 33 to receive the preheated solution.

[0062] Five reaction chambers 51 are arranged equidistantly within the second chamber 15, with a spacing of 200 mm. Each reaction chamber 51 is cylindrical with a volume of 100 L, made of fiberglass, and its inner wall is coated with polytetrafluoroethylene to prevent corrosion.

[0063] The elbow 4 is made of 304 stainless steel with a bending radius of 200mm. Both ends of the elbow are sealed to the flange of reaction chamber 51, and the sealing gaskets are made of polytetrafluoroethylene (PTFE). The uppermost outlet of reaction chamber 51 is connected to the liquid outlet pipe 13, which has an inner diameter of 50mm and is made of PVC.

[0064] 5. Steam circulation heating system

[0065] like Figure 1 and Figure 6 As shown, the steam circulation heating system includes a heater 8, a booster pump 81, and piping components:

[0066] The heater 8 is installed on the outer wall of the housing 1, with a rated power of 50kW, a steam outlet 82 pressure range of 0.3-0.5MPa, and a temperature of 150-180℃.

[0067] The steam outlet 82 is pressurized by the booster pump 81 and then split into a first branch pipe 83 and a second branch pipe 84. The first branch pipe 83 is connected to the first inlet 36 of the pretreatment tank 3, and the second branch pipe 84 is connected to the second inlet 52 of the second cavity 15, respectively supplying steam to the pretreatment system and the reaction system. The booster pump 81 is installed in the steam outlet 82 pipeline with a flow rate of 200 kg / h and is used to increase the steam pressure.

[0068] The steam recovery port 86 is connected to the first outlet 37 of the pretreatment box (3) and the second outlet 53 of the second cavity 15 through the third branch pipe 85 and the fourth branch pipe 87 respectively, so as to realize the recycling of steam and reduce the waste of heat energy.

[0069] II. Working Principle and Operating Procedures

[0070] 1. Feeding and Filtration

[0071] Start the feed pump 11 and deliver the stirred slurry (ratio: 1650g dibromohydantoin, 50g benzyltriethylammonium chloride, 4000ml 20% sulfuric acid, 1240g p-fluorobenzaldehyde) to the filter box 21 at a flow rate of 800L / h.

[0072] The slurry is first filtered through filter plate 211 to remove solid impurities with a particle size >50μm, and the filter residue is discharged through the slag discharge port at the bottom of filter box 21.

[0073] After filtration, the solution enters the secondary filter 6 through the through-tube 22. The activated carbon fiber filter element adsorbs trace organic impurities to ensure the purity of the solution.

[0074] 2. Preheating treatment

[0075] The filtered solution enters the spiral tube 32 of the pretreatment tank 3 through the first delivery pipe 23. At the same time, the heater 8 is started, and the booster pump 81 delivers high-temperature steam through the first branch pipe 83 to the preheating shell 35 to preheat the solution in the spiral tube 32. The preheating temperature is controlled at 80-90℃ (monitored in real time by the temperature sensor inside the shell (35)). The preheated solution enters the multi-stage reaction system through the second delivery pipe 33.

[0076] Specifically, the preheated solution flows into the lowest reaction chamber 51 through the second delivery pipe 33, and the heat insulation plate 34 of the spiral tube 32 ensures that the heat loss is less than 10%.

[0077] 3. Multi-stage bromination reaction

[0078] The preheated solution flows sequentially through multiple reaction chambers 51, with each reaction time controlled at 1.5 hours. Inside the second chamber 15, the heater 8 supplies steam to the second chamber 15 via the second branch pipe 84 to heat the outside of the reaction chamber 51, maintaining the reaction temperature at 120-130℃ (controlled by a temperature sensor on the outer wall of the reaction chamber 51). The solution undergoes a bromination reaction within the reaction chamber 51, and the reaction products are ultimately output to a collection tank through the outlet pipe 13.

[0079] 4. Steam circulation and insulation

[0080] The cooled steam (temperature reduced to 80-90℃) flows back to the steam recovery port 86 of the heater 8 through the third branch pipe 85 and the fourth branch pipe 87, realizing the recycling of heat energy. The insulation plate 34 on the inner wall of the preheating shell 35 further reduces heat loss and improves preheating efficiency. The solution after the reaction is completed is discharged through the liquid outlet pipe 13 of the uppermost reaction tank 51 and enters the product collection tank. The purity of the product is tested to reach 98.5%.

[0081] III. Technological Advantages

[0082] Multi-stage independent preheating and reaction: Through the design of the spiral tube 32 and the segmented reaction chamber 51, the solution is gradually heated and fully reacted, thereby improving the purity of the product.

[0083] Detachable structure: The reaction chamber 51 is connected to the bend 4 via a flange, which facilitates cleaning and maintenance and can adapt to different reaction requirements.

[0084] Steam recycling: Through the design of branch pipes and recovery ports, energy consumption is reduced, which meets the requirements of energy conservation and environmental protection.

[0085] This embodiment achieves a highly efficient and energy-saving bromination reaction process through structural optimization and thermal energy cycle design, which is suitable for continuous production needs in the chemical industry.

[0086] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. For those skilled in the art, various modifications and variations can be made to the embodiments of the present utility model. Any modifications, equivalent substitutions, improvements, etc., 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 detachable multi-section independent preheating tubular reactor, characterized in that, Includes housing (1), filtration system, pretreatment system, multi-stage reaction system and steam circulation heating system; The box (1) is divided into a first cavity (14) and a second cavity (15) by a partition (12). A feed pump (11) is installed on the top of the first cavity (14) for conveying slurry to the filtration system. The filtration system includes a filter box (21) and a secondary filter (6). The filter box (21) is equipped with an inclined filter plate (211). The secondary filter (6) is connected to the filter box (21) through a pipe (22) for two-stage filtration. The pretreatment system includes a pretreatment box (3) with a spiral tube (32) inside. The upper end of the spiral tube (32) is connected to the first conveying pipe (23) of the filtration system, and the lower end is connected to the multi-stage reaction system through the second conveying pipe (33). The multi-stage reaction system consists of multiple reaction tanks (51) connected in series by a bent pipe (4) with flanges. The lowest reaction tank (51) receives the preheated solution, and the highest reaction tank (51) is connected to the liquid outlet pipe (13). The steam circulation heating system includes a heater (8), a booster pump (81) and branch pipelines, which are used to deliver steam to the pretreatment box (3) and the second cavity (15) and realize heat energy circulation through the recovery port (86).

2. The detachable multi-section independent preheating tubular reactor according to claim 1, characterized in that, The filter plate (211) is a stainless steel wire mesh with a pore size of 50μm and an inclination angle of 15° to 30°; the secondary filter (6) uses an activated carbon fiber filter element with a filtration accuracy of 10μm.

3. The detachable multi-section independent preheating tubular reactor according to claim 1, characterized in that, The spiral tube (32) is made of 316L stainless steel, with an outer diameter of 32mm, a pitch of 100mm, and a total length of 15m; the inner wall of the pretreatment box (3) is covered with a 50mm thick aluminum silicate insulation board (34).

4. The detachable multi-section independent preheating tubular reactor according to claim 1, characterized in that, The reaction chamber (51) is made of fiberglass, with a polytetrafluoroethylene coating on the inner wall and a volume of 100L; the flanges at both ends of the bend (4) adopt the PN10DN50 standard, and the sealing gasket is made of polytetrafluoroethylene.

5. The detachable multi-section independent preheating tubular reactor according to claim 1, characterized in that, In the steam circulation heating system: The steam outlet (82) of the heater (8) has a pressure of 0.3-0.5 MPa and a temperature of 150-180℃; The booster pump (81) has a flow rate of 200 kg / h. The first branch pipe (83) and the second branch pipe (84) are respectively connected to the first inlet (36) of the pretreatment box (3) and the second inlet (52) of the second cavity (15). The steam recovery port (86) is connected to the first outlet (37) of the pretreatment box (3) and the second outlet (53) of the second cavity (15) through the third branch pipe (85) and the fourth branch pipe (87), respectively.

6. The detachable multi-section independent preheating tubular reactor according to claim 1, characterized in that, The multi-stage reaction system has 5 reaction chambers (51) with a vertical spacing of 200 mm. The reaction time for each section is controlled at 1.5 hours, and the reaction temperature is maintained at 120-130℃.

7. The detachable multi-section independent preheating tubular reactor according to claim 1, characterized in that, The preheating temperature of the spiral tube (32) of the pretreatment system is 80-90℃, and the preheated solution enters the lowest reaction tank (51) through the second delivery tube (33).

8. The detachable multi-section independent preheating tubular reactor according to any one of claims 1-7, characterized in that, The feed pump (11) is a centrifugal pump with a flow rate range of 500-1000 L / h, used to transport a slurry composed of dibromohydantoin, benzyltriethylammonium chloride, sulfuric acid and p-fluorobenzaldehyde.

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