An ammonia reactor for preparing methenamine by a gas phase method

Abstract

The utility model relates to the technical field of chemical production equipment discloses an ammoniation reactor for preparing hexamethylenetetramine by gas phase method, which comprises a head, a cylinder and a lower cone body, the cylinder is internally provided with a cooling water coil pipe, and the cylinder is externally provided with a jacketed cooling water layer; the ammoniation reactor is provided at the bottom with a formaldehyde pipeline inlet and a gaseous ammonia pipeline inlet; the cooling water coil pipe is connected with a water inlet pipe and a water outlet pipe, and the jacketed cooling water layer is provided with a cooling water inlet pipe and a cooling water outlet pipe. The utility model forms a double cooling structure by arranging the spiral cooling water coil pipe inside the cylinder and arranging the jacketed cooling water layer with the spiral jacketed cooling water pipe outside the cylinder. This structure greatly increases the cooling area, can quickly and fully remove the heat generated in the ammoniation reaction process, ensures the reaction to be carried out at a suitable temperature, and improves the stability of the reaction and the product quality.

Description

Technical Field

[0001] This utility model relates to the field of chemical production equipment technology, specifically to an ammoniation reactor for the gas-phase production of hexamethylenetetramine. Background Technology

[0002] Urotropine is an important chemical raw material with wide applications in various fields. In the gas-phase preparation of urotropine, the ammoniation reaction is a crucial step. This reaction is typically exothermic, generating a large amount of heat. If this heat is not removed promptly and effectively, the reaction temperature will become too high, affecting the reaction process, reducing the yield and quality of urotropine, and posing safety hazards. Existing ammoniation reactors have poor cooling performance and cannot effectively utilize the heat absorbed during cooling, resulting in energy waste. Therefore, an ammoniation reactor for the gas-phase preparation of urotropine was developed. Utility Model Content

[0003] Therefore, the purpose of this utility model is to provide an ammoniation reactor for the gas-phase production of hexamethylenetetramine, which solves the problems of poor cooling effect and ineffective heat utilization in existing ammoniation reactors.

[0004] To achieve the aforementioned objectives of this utility model, the technical solution adopted is as follows: An ammoniation reactor for the gas-phase production of hexamethylenetetramine includes a head, a cylindrical body, and a lower cone. The cylindrical body has an internal cooling water coil, and the external body has a jacketed cooling water layer. The bottom of the ammoniation reactor has a formaldehyde inlet pipe and a gaseous ammonia inlet pipe. The cooling water coil is connected to an inlet pipe and an outlet pipe, and the jacketed cooling water layer has a cooling water inlet pipe and a cooling water outlet pipe.

[0005] Furthermore, the cooling water coil is spirally arranged around the inner wall of the cylinder. This spiral arrangement increases the contact area with the reactants inside the cylinder, thereby more fully absorbing the heat generated by the reaction and improving the cooling effect.

[0006] Furthermore, a spiral-shaped cooling water pipe is provided within the jacketed cooling water layer. One end of the spiral-shaped cooling water pipe is connected to a cooling water inlet pipe located at the bottom of the jacketed cooling water layer, and the other end is connected to a cooling water outlet pipe located at the top of the jacketed cooling water layer. The cooling water enters from the bottom and flows upwards, enabling more thorough heat exchange with the cylinder. This arrangement conforms to the principle of heat exchange and improves cooling efficiency. Both the outlet pipe and the cooling water outlet pipe are connected to a heat recovery circulation system.

[0007] Furthermore, the top of the head is provided with a material outlet pipe to facilitate the smooth discharge of the reacted material.

[0008] Furthermore, the ammoniation reactor also includes a temperature sensor mounted on the cylinder, which is connected to an external control system. The temperature sensor monitors the reaction temperature inside the cylinder in real time and transmits the temperature data to the external control system. The external control system then regulates the cooling system according to a preset temperature range, achieving precise control of the reaction temperature.

[0009] The beneficial effects of this utility model are: 1. This utility model forms a dual cooling structure by setting a spiral cooling water coil inside the cylinder and a jacketed cooling water layer with spiral-shaped jacketed cooling water pipes outside the cylinder. This structure greatly increases the cooling area, which can quickly and fully remove the heat generated during the ammoniation reaction, ensuring that the reaction takes place at a suitable temperature, thereby improving the stability of the reaction and the quality of the product.

[0010] 2. The outlet pipe of the cooling water coil and the outlet pipe of the jacketed cooling water layer are both connected to the heat recovery circulation system, which can recover and utilize the heat absorbed during the cooling process, improve energy efficiency, and reduce production costs.

[0011] 3. The cooling water coil is arranged in a spiral shape, which increases the contact area with the reactants; the cooling water inlet and outlet pipes of the jacketed cooling water layer are designed to ensure that the cooling water fully absorbs heat, further optimizing the cooling effect.

[0012] 4. The temperature sensor is set to monitor the reaction temperature in real time and connect to the external control system. It can adjust the cooling water flow in a timely manner according to temperature changes, so as to achieve precise control of the reaction temperature. Attached Figure Description

[0013] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings: Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the structure of the spiral jacketed cooling water pipe of this utility model.

[0014] In the diagram: 1. End cap, 2. Cylinder, 3. Lower cone, 4. Cooling water coil, 5. Jacketed cooling water layer, 6. Formaldehyde pipe inlet, 7. Ammonia gas pipe inlet, 8. Water inlet pipe, 9. Water outlet pipe, 10. Cooling water inlet pipe, 11. Cooling water outlet pipe, 12. Spiral jacketed cooling water pipe, 13. Material outlet pipe, 14. Temperature sensor. Detailed Implementation

[0015] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0016] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0017] like Figure 1-2 As shown, an ammoniation reactor for the gas-phase production of hexamethylenetetramine includes a head 1, a cylindrical body 2, and a lower cone 3. The cylindrical body 2 is equipped with a cooling water coil 4 inside and a jacketed cooling water layer 5 outside. The bottom of the ammoniation reactor is equipped with a formaldehyde pipe inlet 6 and a gaseous ammonia pipe inlet 7. The cooling water coil 4 is connected to a water inlet pipe 8 and a water outlet pipe 9. The jacketed cooling water layer 5 is equipped with a cooling water inlet pipe 10 and a cooling water outlet pipe 11.

[0018] The cooling water coil 4 is spirally arranged around the inner wall of the cylinder 2, which can increase the contact area with the reactants and improve the cooling efficiency.

[0019] The jacketed cooling water layer 5 is equipped with a spiral-shaped jacketed cooling water pipe 12. One end of the spiral-shaped jacketed cooling water pipe 12 is connected to a cooling water inlet pipe 10 located at the bottom of the jacketed cooling water layer 5, and the other end is connected to a cooling water outlet pipe 11 located at the top of the jacketed cooling water layer 5. This allows the cooling water to flow from bottom to top, fully absorbing the heat of the reaction and ensuring a good cooling effect. Both the outlet pipe 9 and the cooling water outlet pipe 11 are connected to a heat recovery circulation system.

[0020] The top of the end cap 1 is provided with a material outlet pipe 13, which is used to transport the hexamethylenetetramine mother liquor generated by the reaction to the packaging system.

[0021] The ammoniation reactor also includes a temperature sensor 14 installed on the cylinder 2. The temperature sensor 14 is connected to an external control system to monitor the reaction temperature in real time so as to adjust the cooling water flow rate in a timely manner and ensure that the reaction is carried out at a suitable temperature.

[0022] An ammoniation reactor for the gas-phase production of hexamethylenetetramine is described. In actual use, formaldehyde gas from a formaldehyde oxidation furnace enters the bottom of the ammoniation reactor through formaldehyde pipeline inlet 6, and gaseous ammonia produced by ammonia evaporation enters the bottom of the ammoniation reactor through gaseous ammonia pipeline inlet 7. The two undergo a condensation reaction in the reactor to generate hexamethylenetetramine mother liquor.

[0023] Cooling water enters through the inlet pipe 8 of the cooling water coil 4, flows in a circular pattern within the cylinder 2, absorbs the heat generated by the reaction, and then flows out through the outlet pipe 9. Simultaneously, cooling water enters through the cooling water inlet pipe 10 of the jacketed cooling water layer 5, flows upward within the jacket, absorbs heat, and then flows out through the cooling water outlet pipe 11. The hot water flowing out of both the outlet pipe 9 and the cooling water outlet pipe 11 enters the heat recovery circulation system, recycling the heat to other process stages that require heat.

[0024] Temperature sensor 14 monitors the reaction temperature inside cylinder 2 in real time and transmits the data to an external control system. When the temperature is higher than the set value, the external control system increases the flow rate of cooling water to enhance the cooling effect; when the temperature is lower than the set value, it reduces the flow rate of cooling water to ensure that the reaction proceeds within a suitable temperature range. The hexamethylenetetramine mother liquor generated by the reaction is transported to the packaging system through the material outlet at the top of the end cap 1.

[0025] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, component disassembly or combination, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An ammoniation reactor for the gas-phase preparation of hexamethylenetetramine, comprising a head, a cylindrical body, and a lower cone, characterized in that: The cylinder is equipped with a cooling water coil inside and a jacketed cooling water layer outside the cylinder; the bottom of the ammoniation reactor is equipped with a formaldehyde pipe inlet and a gaseous ammonia pipe inlet; the cooling water coil is connected to an inlet pipe and an outlet pipe, and the jacketed cooling water layer is equipped with a cooling water inlet pipe and a cooling water outlet pipe.

2. The ammoniation reactor for the gas-phase preparation of hexamethylenetetramine according to claim 1, characterized in that: The cooling water coil is spirally arranged around the inner wall of the cylinder.

3. The ammoniation reactor for the gas-phase preparation of hexamethylenetetramine according to claim 1, characterized in that: The jacketed cooling water layer is provided with a spiral jacketed cooling water pipe. One end of the spiral jacketed cooling water pipe is connected to a cooling water inlet pipe located at the bottom of the jacketed cooling water layer, and the other end is connected to a cooling water outlet pipe located at the top of the jacketed cooling water layer. Both the outlet pipe and the cooling water outlet pipe are connected to the heat recovery circulation system.

4. The ammoniation reactor for gas-phase preparation of hexamethylenetetramine according to claim 1, characterized in that: The top of the end cap is equipped with a material outlet pipe.

5. An ammoniation reactor for the gas-phase preparation of hexamethylenetetramine according to claim 1, characterized in that: It also includes a temperature sensor mounted on the cylinder, which is connected to an external control system.

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