Multi-strand feeding column type reactor
The design of a multi-feed column reactor solves the problems of large equipment investment, large footprint and poor heat exchange capacity in the production of N,N-dinitrosopentamethylenetetramine, achieving efficient continuous production and improved product purity.
Patent Information
- Application Number
- CN202422792403.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-15
- Publication Date
- 2025-09-30
- Estimated Expiration
- 2034-11-15
AI Technical Summary
The existing production methods of N,N-dinitrosopentamethylenetetramine have the problems of large one-time investment, high maintenance cost, large floor space, large heat release and poor heat exchange capacity of traditional kettle reaction, resulting in low product yield and low purity.
A multi-feed column reactor is used, including a vertical cylindrical reaction tube, a partitioned disc and a multi-stage reaction chamber, combined with a stirring component and a thermal insulation module to achieve multi-stream feeding and continuous production. The reaction tube is divided into a multi-stage reaction chamber by the partitioned disc, and the stirring component and thermal insulation module are used for effective mixing and temperature control.
The production capacity and purity of N,N-dinitrosopentamethylenetetramine are improved, the equipment footprint and heat loss are reduced, energy consumption is reduced, and better heat exchange control and product yield are achieved.
Smart Images
Figure CN223393446U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of chemical equipment and relates to a reactor, in particular to a multi-feed column type continuous reactor. Background Art
[0002] N,N-Dinitrosopentamethylenetetramine is primarily used in the manufacture of sponge rubber and is often used in plastics such as polyvinyl chloride. Upon heating, it decomposes into nitrogen, creating pores that generate large amounts of gas and offer high bubbling efficiency. Currently, the conventional production method for N,N-Dinitrosopentamethylenetetramine uses urotropine, sodium nitrite, and sulfuric acid as raw materials to generate N,N-Dinitrosopentamethylenetetramine and formaldehyde. Ammonia is then added dropwise to reduce the formaldehyde to produce urotropine. Sulfuric acid is then added dropwise again to continue the process of generating N,N-Dinitrosopentamethylenetetramine and formaldehyde. Finally, ammonia is added dropwise to reduce the formaldehyde produced by the reaction, completing the reaction. The resulting reaction solution is then separated from the wastewater and washed and dehydrated to yield N,N-Dinitrosopentamethylenetetramine. This method requires high initial investment, high maintenance costs, and requires a large footprint. Furthermore, traditional batch reactors have high liquid holdup and high exothermicity. The low heat transfer capacity of the reactor jacket makes them hazardous. Continuous production can effectively reduce liquid holdup to less than 20% and better control reaction temperature through heat exchange. Furthermore, the poor heat transfer capacity results in a yield of only around 75% in traditional batch reactors. Therefore, the development of a continuous reactor for the preparation of N,N-dinitrosopentamethylenetetramine is needed to improve product yield and purity. Summary of the Invention
[0003] The utility model aims to provide a multi-feed column reactor in order to overcome the deficiencies of the prior art.
[0004] In order to achieve the above object, the technical solution adopted by the utility model is: a multi-feed column reactor, which includes:
[0005] A reaction tube, the reaction tube being vertically arranged and cylindrical;
[0006] a stirring assembly comprising a stirring shaft disposed in the reaction tube and extending outward therefrom, a plurality of stirring blades formed on an outer surface of the stirring shaft and located in the reaction tube, and a motor connected to an upper end of the stirring shaft for driving the stirring shaft to rotate;
[0007] Multiple partition discs, each of which is mounted on the stirring shaft through a mounting hole at the center; the multiple partition discs are arranged in an upper and lower interval within the reaction tube to divide the reaction tube into multiple stages of reaction chambers, and a material flow gap is formed between each partition disc and the inner wall of the reaction tube; the bottom reaction chamber has multiple feed ports, and the other reaction chambers have at least one feed port; the top reaction chamber also has a discharge port and an exhaust port.
[0008] Optimally, it also includes:
[0009] A plurality of groups of heat preservation modules are formed on the outer wall of the reaction tube and correspond one-to-one to the plurality of groups of reaction chambers.
[0010] Furthermore, there are three partition discs that divide the reaction tube into four-level reaction chambers, and there are four groups of heat preservation modules.
[0011] Furthermore, the multiple insulation modules are defined as a first insulation jacket, a second insulation module, a third insulation module and a fourth insulation module from bottom to top, the first insulation jacket has a first jacket inlet and a first jacket outlet located above the first jacket inlet, the second insulation module has a second jacket inlet and a second jacket outlet located above the second jacket inlet, the third insulation module has a third jacket inlet and a third jacket outlet located above the third jacket inlet, and the fourth insulation module has a fourth jacket inlet and a fourth jacket outlet located above the fourth jacket inlet.
[0012] Furthermore, it also includes a plurality of temperature measuring ports arranged on the reaction tube and corresponding one-to-one to the plurality of groups of the insulation modules, and the plurality of temperature measuring ports are defined as a first temperature measuring port, a second temperature measuring port, a third temperature measuring port and a fourth temperature measuring port in sequence from bottom to top.
[0013] Optimally, the width of the gap is 0.5-2 mm.
[0014] Due to the application of the above technical solution, the present invention has the following advantages compared with the existing technology: the multi-feed column reactor of the present invention adopts a vertical and cylindrical reaction tube and uses a partitioning disk to divide it into multi-stage reaction chambers (the reaction chambers are connected by material flow gaps), so that multi-feed can be achieved and can be used to achieve continuous production of N,N-dinitrosopentamethylenetetramine; the production capacity value of a single device is large, which effectively improves the overall production capacity; the reaction equipment is small and occupies a small area, which can free up more space for other processes, and reduces heat loss and lowers energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 This is a schematic structural diagram of the multi-feed column reactor of the utility model;
[0016] Figure 2 This is a schematic structural diagram of the partition disc in the multi-feed column reactor of the utility model. DETAILED DESCRIPTION
[0017] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.
[0018] like Figure 1 The multi-feed column reactor shown mainly includes structures such as a reaction tube 1, a stirring assembly 2 and a partitioning disc 3.
[0019] The reaction tube 1 is vertically arranged and cylindrical. The stirring assembly 2 includes a stirring shaft 21, stirring blades 22, and a motor 23. The stirring shaft 21 is disposed within the reaction tube 1 and extends therefrom (i.e., the upper end of the stirring shaft 21 extends to the exterior of the reaction tube 1). The stirring blades 22 have multiple paths formed on the outer surface of the stirring shaft 21 and positioned within the reaction tube 1 (the specific shape and structure of the stirring blades 22 are not limited, as long as they can achieve mixing of the materials; conventional existing structures can be used). The motor 23 is connected to the upper end of the stirring shaft 21 to drive the stirring shaft 21. The motor 23 is mounted in a conventional manner, such as by mounting a bracket on the top of the reaction tube 1 so that the motor 23 is mounted on the bracket. The connection between the motor 23 and the stirring shaft 21 can be a direct connection, a gear drive connection, a belt drive connection, etc., as long as the motor 23 can drive the stirring shaft 21.
[0020] The partition disc 3 is composed of multiple pieces, and in this embodiment, there are three pieces. Each partition disc 3 is mounted on the stirring shaft 21 through the mounting hole 31 at the center (specifically, as shown in FIG. Figure 2 As shown, a mounting hole 31 is provided at the center of the partition disk 3, through which the partition disk 3 and the stirring shaft 21 are tightly connected. The mounting method can be interference fit, welding, etc.). Multiple partition disks 3 are arranged at intervals (generally at equal intervals, but of course they can be arranged at unequal intervals according to actual reaction requirements) in the reaction tube 1 to divide the reaction tube 1 into multiple stages of reaction chambers, so that a material flow gap is formed between each partition disk 3 and the inner wall of the reaction tube 1 (it can be seen that the separation here is not a complete isolation, and the adjacent two-stage reaction chambers are interconnected at the edge; the width of the material flow gap is preferably 0.5-2 mm). The bottom reaction chamber has multiple feed ports (two in this embodiment), and the other reaction chambers have at least one feed port (usually one); the top reaction chamber also has a discharge port 16 and an exhaust port 17. It can be seen that when there are three partitioning disks 3, the reaction tube 1 is divided into four-stage reaction chambers; therefore, the four-stage reaction chamber has at least five feed inlets, which can realize the feeding of multiple materials (i.e., multi-stream feeding), and can be used to achieve continuous production of certain chemicals (such as N,N-dinitrosopentamethylenetetramine).
[0021] In this embodiment, the multi-feed column reactor further includes multiple groups of insulation modules. Multiple groups of insulation modules are formed on the outer wall of the reaction tube 1 and correspond one-to-one to multiple groups of reaction chambers; when the reaction chamber is four-stage, the corresponding insulation modules are also four groups. The multiple insulation modules are defined as a first insulation jacket 4, a second insulation module 5, a third insulation module 6 and a fourth insulation module 7 from bottom to top, wherein the first insulation jacket 4 has a first jacket inlet 41 and a first jacket outlet 42 located above the first jacket inlet 41, the second insulation module 5 has a second jacket inlet 51 and a second jacket outlet 52 located above the second jacket inlet 51, the third insulation module 6 has a third jacket inlet 61 and a third jacket outlet 62 located above the third jacket inlet 61, and the fourth insulation module 7 has a fourth jacket inlet 71 and a fourth jacket outlet 72 located above the fourth jacket inlet 71; the above-mentioned jacket inlet is used to input a temperature control medium into the insulation jacket, and the jacket outlet is used to output the temperature control medium, which is an existing conventional method.
[0022] In this embodiment, the multi-feed column reactor also includes a plurality of temperature measuring ports arranged on the reaction tube 1 and corresponding one-to-one to the multiple groups of insulation modules (the temperature measuring ports can be embedded in the reaction tube 1, or can be embedded only in the corresponding jackets). The plurality of temperature measuring ports are defined from bottom to top as a first temperature measuring port 101, a second temperature measuring port 102, a third temperature measuring port 103 and a fourth temperature measuring port 104, which are used to cooperate with the insulation modules, thereby accurately controlling the reaction temperature of each level of reaction chamber.
[0023] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those familiar with the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications based on the spirit of the present invention are intended to be included in the scope of protection of the present invention.
Claims
1. A multi-feed column reactor, characterized in that: It includes: A reaction tube (1), wherein the reaction tube (1) is arranged vertically and is cylindrical; A stirring assembly (2), the stirring assembly (2) comprising a stirring shaft (21) disposed in the reaction tube (1) and extending outward thereof, a plurality of stirring blades (22) formed on the outer surface of the stirring shaft (21) and located in the reaction tube (1), and a motor (23) connected to the upper end of the stirring shaft (21) for driving the stirring shaft (21) to rotate; A plurality of partition discs (3), each of the partition discs (3) being mounted on the stirring shaft (21) through a mounting hole (31) at the center; the plurality of partition discs (3) being arranged in an upper and lower interval in the reaction tube (1) to divide the reaction tube (1) into multiple reaction chambers, and a material flow gap being formed between each partition disc (3) and the inner wall of the reaction tube (1); the bottom reaction chamber having a plurality of feed ports, and the other reaction chambers having at least one feed port; the top reaction chamber also having a discharge port (16) and an exhaust port (17).
2. The multi-feed column reactor according to claim 1, characterized in that It also includes: Multiple groups of heat preservation modules are formed on the outer wall of the reaction tube (1) and correspond one-to-one to the multiple groups of reaction chambers.
3. The multi-feed column reactor according to claim 2, characterized in that: There are three partition discs (3) that divide the reaction tube (1) into four-stage reaction chambers, and there are four groups of heat preservation modules.
4. The multi-feed column reactor according to claim 3, characterized in that: The plurality of insulation modules are defined as a first insulation jacket (4), a second insulation module (5), a third insulation module (6) and a fourth insulation module (7) in order from bottom to top. The first insulation jacket (4) has a first jacket inlet (41) and a first jacket outlet (42) located above the first jacket inlet (41). The second insulation module (5) has a second jacket inlet (51) and a second jacket outlet (52) located above the second jacket inlet (51). The third insulation module (6) has a third jacket inlet (61) and a third jacket outlet (62) located above the third jacket inlet (61). The fourth insulation module (7) has a fourth jacket inlet (71) and a fourth jacket outlet (72) located above the fourth jacket inlet (71).
5. The multi-feed column reactor according to claim 3, characterized in that: It also includes a plurality of temperature measuring ports arranged on the reaction tube (1) and corresponding one-to-one to the plurality of groups of the heat preservation modules, wherein the plurality of temperature measuring ports are defined as a first temperature measuring port (101), a second temperature measuring port (102), a third temperature measuring port (103) and a fourth temperature measuring port (104) in order from bottom to top.
6. The multi-feed column reactor according to claim 1, characterized in that: The width of the gap is 0.5-2 mm.