An apparatus for preparing dicyclohexylamine by hydrogenation of aniline
By using multiple sets of detachable water distributors and detachable demisters in the reactor, the problem of insufficient mixing of hydrogen and materials was solved, achieving efficient hydrogenation reaction and high yield of dicyclohexylamine.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHUCHENG TAISHENG CHEM CO LTD
- Filing Date
- 2025-06-16
- Publication Date
- 2026-07-14
AI Technical Summary
Traditional reactors have a simple material distribution structure, resulting in insufficient mixing of hydrogen and materials, which affects the efficiency of the hydrogenation reaction.
Multiple sets of detachable water inlet distributors and detachable demisters are used to increase the contact area between hydrogen and materials, and the reaction efficiency is improved by recycling the reactants.
This method achieves thorough mixing of hydrogen and materials, increases the contact area, and improves the efficiency of the hydrogenation reaction and the yield of dicyclohexylamine.
Smart Images
Figure CN224485927U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a dicyclohexylamine production apparatus, specifically an apparatus for preparing dicyclohexylamine by hydrogenation of aniline. Background Technology
[0002] The basic principle of cyclohexylamine preparation by hydrogenation of aniline is to react aniline with hydrogen gas in the presence of a catalyst to produce cyclohexylamine. Traditional reaction vessels have a simple material distribution structure and an unreasonable structural design, which is not conducive to the full mixing of hydrogen gas and materials. Utility Model Content
[0003] To address the aforementioned problems, the purpose of this invention is to provide an apparatus for the hydrogenation of aniline to prepare dicyclohexylamine.
[0004] To achieve the above objectives, the technical solution of this utility model is as follows: an apparatus for preparing dicyclohexylamine by hydrogenation of aniline, comprising a vertical cylinder and a circulating water outlet at the bottom of the cylinder, a hydrogen outlet at the center of the top end cap of the cylinder, a detachable demister at the top of the cylinder, and multiple sets of detachable water inlet distributors arranged vertically and communicating with the outside fixed in the cylinder below the detachable demister. A horizontal grid plate is respectively provided in the cylinder below each detachable water inlet distributor, and a hydrogen inlet is provided on one side of the cylinder of the bottommost grid plate.
[0005] Furthermore, each grid plate is fixedly supported inside the cylinder by a support ring fixed to the inner side wall of the cylinder.
[0006] Furthermore, the side wall of the cylinder is provided with multiple manholes arranged vertically.
[0007] Furthermore, a water inlet communicating with the interior of the cylinder is provided on the outer wall of the cylinder below the detachable demister.
[0008] Furthermore, a rigid ring support is fixed to the outer wall of the cylinder.
[0009] Furthermore, the cylinder body adopts an upper and lower split design and is fixedly connected by a flange, which is located below the detachable water inlet distributor.
[0010] With the above settings, when this utility model is working, aniline enters the cylinder through multiple sets of detachable water inlet distributors, and hydrogen is injected into the cylinder through a high-pressure hydrogen supply system. The detachable water inlet distributors fully distribute the aniline, so that the hydrogen is fully mixed with the cyclohexylamine-containing material in the reactor, and the hydrogen is evenly dispersed in the material in the form of small bubbles, increasing the contact area between the hydrogen and the material.
[0011] Specific catalysts, such as metal catalysts, are typically added inside the reactor. Under the action of the catalyst, the unsaturated bonds in cyclohexylamine undergo an addition reaction with hydrogen. Taking cyclohexylamine production as an example, under certain temperature, pressure, and catalyst conditions, further hydrogenation reactions may occur to produce products such as dicyclohexylamine. This invention features multiple sets of detachable water inlet distributors, forming a uniformly distributed material distribution system. This not only increases the contact area between hydrogen and the material but also allows for the recycling of the reactants. A portion of the reaction products can participate in the recycling process, resulting in a more complete reaction. Attached Figure Description
[0012] The present invention will now be further described with reference to the accompanying drawings.
[0013] Figure 1 This is a schematic diagram of the main structure of this utility model;
[0014] Figure 2 This is a physical reference drawing of the present invention. Detailed Implementation
[0015] like Figure 1 As shown, an apparatus for the hydrogenation of aniline to prepare dicyclohexylamine includes a vertical cylinder 1 and a circulating water outlet 2 at the bottom of the cylinder 1. A hydrogen outlet 3 is located at the center of the top end cap of the cylinder 1. A detachable demister 4 is installed at the top inside the cylinder 1. Multiple sets of detachable water inlet distributors 5, arranged vertically and communicating with the outside, are fixed inside the cylinder 1 below the detachable water inlet distributor 4. A horizontal grid plate 6 is installed inside the cylinder 1 below each detachable water inlet distributor 5. A hydrogen inlet 7 is installed on one side of the bottommost grid plate 6 of the cylinder 1.
[0016] Specifically: Each grid plate 6 is fixedly supported inside the cylinder 1 by a support ring 8 fixed to the inner side wall of the cylinder 1. Multiple manholes 9 are arranged vertically on the side wall of the cylinder 1. A water inlet 10 communicating with the interior of the cylinder 1 is provided on the outer side wall of the cylinder 1 below the detachable demister 4. A rigid ring support 11 is fixed to the outer side wall of the cylinder 1. The cylinder 1 is a split-type structure, connected by a flange 12, which is located below the detachable water inlet distributor 5.
[0017] The detachable demister 4 and the detachable water inlet distributor 5 are existing devices in the field. For example, the detachable water inlet distributor 5 is similar to a shower head structure and is easy to purchase from the market. Therefore, its structure will not be described in detail here.
[0018] Working principle of this utility model:
[0019] Aniline enters the cylinder 1 through multiple sets of detachable water inlet distributors 5. Hydrogen is injected into the cylinder 1 through a high-pressure hydrogen supply system. The detachable water inlet distributors 5 fully distribute the aniline, so that the hydrogen is fully mixed with the cyclohexylamine-containing material in the reactor. The hydrogen is evenly dispersed in the material in the form of small bubbles, increasing the contact area between the hydrogen and the material.
[0020] Catalytic reaction: Specific catalysts, such as some metal catalysts, are usually added into cylinder 1. Under the action of the catalyst, the unsaturated bonds in cyclohexylamine undergo an addition reaction with hydrogen. Taking the production of cyclohexylamine as an example, under certain temperature, pressure and catalyst conditions, further hydrogenation reaction may occur to generate products such as dicyclohexylamine.
[0021] Temperature and pressure control: Heat is generated during the reaction process, and a heating or cooling system can be set up to adjust the temperature in a timely manner according to the reaction needs, maintaining the reaction within a suitable temperature range. At the same time, a control system can be set up to monitor and control the pressure inside the reactor to ensure stable pressure and guarantee the safe and efficient conduct of the reaction.
[0022] The above description is merely an illustrative embodiment of this utility model and is not intended to limit the scope of this utility model. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of this utility model should fall within the protection scope of this utility model.
Claims
1. An apparatus for the hydrogenation of aniline to prepare dicyclohexylamine, comprising a vertical cylindrical body (1) and a circulating water outlet (2) disposed at the bottom of the cylindrical body (1), and a hydrogen outlet (3) disposed at the center of the top end cap of the cylindrical body (1), characterized in that: A detachable demister (4) is installed at the top of the cylinder (1). Multiple sets of detachable water inlet distributors (5) arranged vertically and connected to the outside are fixed in the cylinder (1) below the detachable demister (4). A horizontal grid plate (6) is installed in the cylinder (1) below each detachable water inlet distributor (5). A hydrogen inlet (7) is installed on one side of the cylinder (1) of the bottommost grid plate (6).
2. The apparatus for preparing dicyclohexylamine by hydrogenation of aniline as described in claim 1, characterized in that: Each grid plate (6) is fixedly supported inside the cylinder (1) by a support ring (8) fixed to the inner wall of the cylinder (1).
3. The apparatus for preparing dicyclohexylamine by hydrogenation of aniline as described in claim 1, characterized in that: The side wall of the cylinder (1) is provided with multiple manholes (9) arranged vertically.
4. The apparatus for preparing dicyclohexylamine by hydrogenation of aniline as described in claim 1, characterized in that: The outer wall of the cylinder (1) below the detachable demister (4) is provided with a water inlet (10) that communicates with the inside of the cylinder (1).
5. The apparatus for preparing dicyclohexylamine by hydrogenation of aniline as described in claim 1, characterized in that: A rigid ring support (11) is fixed to the outer wall of the cylinder (1).
6. The apparatus for preparing dicyclohexylamine by hydrogenation of aniline as described in claim 1, characterized in that: The cylinder (1) is a split type, and is fixedly connected by a flange (12). The flange (12) is located below the detachable water inlet distributor (5).