A hexanediamine plant radial reactor
By designing a radial reactor for the hexamethylenediamine unit, employing an outer distribution cylinder, an inner distribution cylinder, and a central cylinder structure, the manufacturing and transportation challenges of tubular fixed catalytic bed reactors in the large-scale process were solved, achieving uniform distribution of the catalyst and uniform flow of the reaction gas, thereby improving reaction efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU YONGDA CHEM MACHINERY
- Filing Date
- 2025-06-14
- Publication Date
- 2026-06-05
AI Technical Summary
The tubular fixed catalytic bed reactor in existing hexamethylenediamine units presents challenges in manufacturing and transportation during the scaling-up process, and the uneven gas flow distribution affects the smooth progress of the catalytic reaction.
A radial reactor for a hexamethylenediamine device is designed, employing an outer distribution cylinder, an inner distribution cylinder, and a central cylinder structure. The catalyst is distributed outside the heat exchange tube bundle, creating a radial gas channel. The gas reacts under the action of the catalyst, avoiding simply increasing the reactor diameter.
This technology enables uniform distribution of catalysts and uniform flow of reaction gases in large-scale reactors, simplifying manufacturing and transportation and improving reaction efficiency.
Smart Images
Figure CN224321399U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a reactor, specifically to a radial reactor for a hexamethylenediamine device. Background Technology
[0002] Hexamethylenediamine is an important chemical intermediate, mainly used to prepare nylon 66 and nylon 610. It can also be used to prepare HDI, polyurethane resins, and curing agents. It is a high-growth sector in my country's new materials field.
[0003] The reactor in the current diamine unit is a tubular fixed catalytic bed reactor. The catalyst is placed inside the heat exchange tubes, and the reaction gas flows from top to bottom through the catalyst bed in the tubes to carry out the gas-phase reaction. The heating medium flows through the shell side to provide the heat required for the reaction. The gas flow entering the catalytic reactor should be evenly distributed across the entire cross-section and pass evenly through each tube containing the catalyst to ensure that the catalytic reaction proceeds smoothly in the predetermined direction.
[0004] With the increasing size of hexamethylenediamine (HDA) plants, the reactor diameter has also been increasing from 5 meters to 6 meters to 7 meters, posing a great challenge to the manufacturing and transportation of the reactor. Utility Model Content
[0005] To address the aforementioned problems, this invention proposes a radial reactor for a hexamethylenediamine device.
[0006] The technical solution of this utility model:
[0007] A radial reactor for a hexamethylenediamine (HMD) device includes a shell, a heat exchange tube bundle, a gas collecting ring box for the heat transfer medium, and a liquid collecting ring box for the heat transfer medium. The reactor also includes an outer distribution cylinder and an inner distribution cylinder, both installed inside the shell. The inner distribution cylinder is located inside the outer distribution cylinder, and the interlayer space between the inner and outer distribution cylinders constitutes the reaction zone. The heat exchange tube bundle, the gas collecting ring box for the heat transfer medium, and the liquid collecting ring box for the heat transfer medium are installed within the reaction zone. The gas collecting ring box is located above the heat exchange tube bundle, and the liquid collecting ring box for the heat transfer medium is located below the heat exchange tube bundle. The upper end of the heat exchange tube bundle converges into the gas collecting ring box, and the lower end converges into the liquid collecting ring box. The middle section of the outer and inner distribution cylinders is a permeable section, opposite to the heat exchange tube bundle. The reaction zone is filled with a catalyst, which covers the heat exchange tube bundle. The top of the shell is provided with a gas inlet pipe, and the bottom is provided with a reaction gas outlet. The lower end of the gas inlet pipe is connected to the top of the inner distribution cylinder, and the reaction gas outlet is connected to the lower end of the interlayer space between the outer distribution cylinder and the shell.
[0008] To further refine the above technical solution, the reactor also includes a central cylinder, which is a conical cylinder installed inside the inner distribution cylinder. The tip of the central cylinder faces upward and passes through the middle section of the inner distribution cylinder.
[0009] To further refine the above technical solution, the middle section of the outer distribution cylinder and the inner distribution cylinder is a Johnson mesh, and the upper and lower sections of the outer distribution cylinder and the inner distribution cylinder are thin steel plates.
[0010] To further refine the above technical solution, the top of the outer shell is provided with a heat medium gas inlet pipe and the bottom is provided with a condensate outlet. The heat medium gas inlet pipe is connected to the heat medium gas collection ring box, and the condensate outlet is connected to the heat medium liquid collection ring box.
[0011] To further refine the above technical solution, the lower end of the gas inlet pipe is a groove that slides and connects with the top of the inner distribution cylinder.
[0012] To further refine the above technical solution, the reactor also includes a skirt, which is installed at the bottom of the outer shell and supports the outer shell.
[0013] To further refine the above technical solution, an inspection hole is provided at the bottom of the outer casing.
[0014] To further refine the above technical solution, the reaction zone is also filled with ceramic balls, some of which are located above the catalyst and some below the catalyst, with the ceramic balls located above the catalyst pressing down on the catalyst.
[0015] To further refine the above technical solution, a catalyst inlet pipe is provided at the top of the outer shell and a catalyst outlet pipe is provided at the bottom. The catalyst inlet pipe is connected to the upper end of the reaction zone, and the catalyst outlet pipe is connected to the lower end of the reaction zone.
[0016] To further refine the above technical solution, a reaction gas outlet baffle is installed inside the outer shell. The reaction gas outlet baffle is located at the reaction gas outlet and isolates the catalyst from the ceramic balls.
[0017] The advantages of this invention are that it has a reasonable design, simple structure, improved catalytic bed structure, and a reaction zone with the catalyst distributed outside the heat exchange tube bundle. In addition, a radial gas channel is constructed so that the gas passes through the reaction zone and reacts under the action of the catalyst. In this way, when the reactor is scaled up, the diameter of the reactor is not increased indiscriminately. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the radial reactor structure of a hexamethylenediamine unit.
[0019] In the diagram, 1 is the outer shell, 2 is the heat exchange tube bundle, 3 is the heat medium gas collection ring box, 4 is the heat medium liquid collection ring box, 5 is the outer distribution cylinder, 6 is the inner distribution cylinder, 7 is the gas inlet pipe, 8 is the reaction gas outlet, 9 is the central cylinder, 10 is the heat medium gas inlet pipe, 11 is the condensate outlet, 12 is the skirt seat, 13 is the inspection hole, 14 is the catalyst inlet pipe, 15 is the catalyst outlet pipe, and 16 is the reaction gas outlet baffle. Detailed Implementation
[0020] As shown in the figure, a radial reactor for a hexamethylenediamine device includes an outer shell 1, a heat exchange tube bundle 2, a heat medium gas collecting ring box 3, and a heat medium liquid collecting ring box 4. The reactor also includes an outer distribution cylinder 5 and an inner distribution cylinder 6, which are installed inside the outer shell 1. The inner distribution cylinder 6 is located inside the outer distribution cylinder 5, and the space between it and the outer distribution cylinder 5 is the reaction zone. The heat exchange tube bundle 2, the heat medium gas collecting ring box 3, and the heat medium liquid collecting ring box 4 are installed within the reaction zone. The heat medium gas collecting ring box 3 is located above the heat exchange tube bundle 2, and the heat medium liquid collecting ring box 4 is located within the heat exchange tube bundle 2. Below 2, the upper end of the heat exchange tube bundle 2 converges to the heat medium gas collection ring box 3, and the lower end converges to the heat medium liquid collection ring box 4; the middle section of the outer distribution cylinder 5 and the inner distribution cylinder 6 is a permeable section, which is opposite to the heat exchange tube bundle 2; the reaction zone is filled with catalyst, which covers the heat exchange tube bundle 2; the top of the outer shell 1 is provided with a gas inlet pipe 7, and the bottom is provided with a reaction gas outlet 8. The lower end of the gas inlet pipe 7 is connected to the top of the inner distribution cylinder 6, and the reaction gas outlet 8 is connected to the lower end of the interlayer space between the outer distribution cylinder 5 and the outer shell 1; the reactor also includes a central cylinder 9, which is a cone cylinder, and is installed in the inner distribution cylinder 6. Inside the inner distribution cylinder 6, the tip of the central cylinder 9 faces upward and passes through the middle section of the inner distribution cylinder 6; the middle sections of the outer distribution cylinder 5 and the inner distribution cylinder 6 are Johnson mesh, and the upper and lower sections of the outer distribution cylinder 5 and the inner distribution cylinder 6 are thin steel plates; the top of the outer shell 1 is provided with a heat medium gas inlet pipe 10, and the bottom is provided with a condensate outlet 11. The heat medium gas inlet pipe 10 is connected to the heat medium gas collection ring box 3, and the condensate outlet 11 is connected to the heat medium liquid collection ring box 4; the lower end of the gas inlet pipe 7 is a slotted opening, which is slidably connected to the top of the inner distribution cylinder 6; the reactor also includes a skirt 12, which is installed at the bottom of the outer shell 1. The system includes a supporting outer shell 1; an inspection hole 13 is provided at the bottom of the outer shell 1; the reaction zone is also filled with ceramic balls, some of which are located above the catalyst and some are located below the catalyst, with the ceramic balls located above the catalyst pressing the catalyst; the top of the outer shell 1 is provided with a catalyst inlet pipe 14 and the bottom is provided with a catalyst outlet pipe 15, the catalyst inlet pipe 14 is connected to the upper end of the reaction zone and the catalyst outlet pipe 15 is connected to the lower end of the reaction zone; a reaction gas outlet baffle 16 is installed inside the outer shell 1, the reaction gas outlet baffle 16 is located at the reaction gas outlet 8, and isolates the catalyst from the ceramic balls.
[0021] The above-disclosed embodiments are merely preferred embodiments of the present utility model, but are not intended to limit the scope thereof. Any changes and modifications made by those skilled in the art without departing from the spirit and essence of the present utility model shall fall within the protection scope of the present utility model.
Claims
1. A radial reactor for a hexamethylenediamine unit, the reactor comprising a shell, a heat exchange tube bundle, a heat medium gas collection ring box, and a heat medium liquid collection ring box; characterized in that, The reactor further includes an outer distribution cylinder and an inner distribution cylinder, which are installed inside the outer shell. The inner distribution cylinder is located inside the outer distribution cylinder, and the interlayer space between the inner and outer distribution cylinders constitutes the reaction zone. The heat exchange tube bundle, the heat medium gas collection ring box, and the heat medium liquid collection ring box are installed in the reaction zone. The heat medium gas collection ring box is located above the heat exchange tube bundle, and the heat medium liquid collection ring box is located below the heat exchange tube bundle. The upper end of the heat exchange tube bundle converges into the heat medium gas collection ring box, and the lower end converges into the heat medium liquid collection ring box. The middle section of the outer and inner distribution cylinders is a permeable section, which is opposite to the heat exchange tube bundle. The reaction zone is filled with a catalyst, and the catalyst covers the heat exchange tube bundle. The outer shell is provided with a gas inlet pipe at the top and a reaction gas outlet at the bottom. The lower end of the gas inlet pipe is connected to the top of the inner distribution cylinder, and the reaction gas outlet is connected to the lower end of the interlayer space between the outer distribution cylinder and the outer shell.
2. The radial reactor for a hexamethylenediamine unit according to claim 1, characterized in that, The reactor also includes a central cylinder, which is a conical cylinder installed inside the inner distribution cylinder. The tip of the central cylinder faces upward and passes through the middle section of the inner distribution cylinder.
3. The radial reactor for a hexamethylenediamine unit according to claim 1, characterized in that, The middle section of the outer and inner distribution cylinders is made of Johnson mesh, and the upper and lower sections of the outer and inner distribution cylinders are made of thin steel plates.
4. A radial reactor for a hexamethylenediamine unit according to claim 1, characterized in that, The outer shell is provided with a heat medium gas inlet pipe at the top and a condensate outlet at the bottom. The heat medium gas inlet pipe is connected to the heat medium gas collection ring box, and the condensate outlet is connected to the heat medium liquid collection ring box.
5. A radial reactor for a hexamethylenediamine unit according to claim 1, characterized in that, The lower end of the gas inlet pipe is a groove that slides into the top of the inner distribution cylinder.
6. A radial reactor for a hexamethylenediamine unit according to claim 1, characterized in that, The reactor also includes a skirt, which is installed at the bottom of the outer shell and supports the outer shell.
7. A radial reactor for a hexamethylenediamine unit according to claim 1, characterized in that, An inspection hole is provided at the bottom of the outer casing.
8. A radial reactor for a hexamethylenediamine unit according to claim 1, characterized in that, The reaction zone is also filled with ceramic balls, some of which are located above the catalyst and some below the catalyst. The ceramic balls located above the catalyst press the catalyst down.
9. A radial reactor for a hexamethylenediamine unit according to claim 1, characterized in that, The outer shell is provided with a catalyst inlet pipe at the top and a catalyst outlet pipe at the bottom. The catalyst inlet pipe is connected to the upper end of the reaction zone and the catalyst outlet pipe is connected to the lower end of the reaction zone.
10. A radial reactor for a hexamethylenediamine unit according to claim 8, characterized in that, The outer casing is equipped with a reaction gas outlet baffle, which is located at the reaction gas outlet and isolates the catalyst from the ceramic balls.