Temperature control reactor for preparing 6-aminocapronitrile
By designing the multi-stage structure of the temperature-controlled reactor, the catalyst is solved due to polymer blockage and carbon deactivation, and the reactor is stable and efficient energy utilization is achieved, which is suitable for the preparation of 6-aminocapronitrile.
Patent Information
- Application Number
- CN202422550785.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-22
- Publication Date
- 2025-08-26
- Estimated Expiration
- 2034-10-22
AI Technical Summary
In the prior art, the reaction by-product water catalyzes the polymerization of caprolactam, and the generated polymer blocks the catalyst pores, resulting in a decrease in catalyst activity, and high-temperature reactions are prone to tar and carbon deposits, resulting in catalyst deactivation and poor stability of the reaction device.
A temperature control reactor including evaporation gasification section, mixed gas preheating section, temperature control reaction section and heat intersection section is designed. Through jet mixing, gas-liquid separation and temperature control, the raw material liquid and gas are fully mixed and the temperature is uniform, side reactions are avoided, the catalyst life is extended, and the heat energy is recovered.
It improves the reaction conversion rate and selectivity, extends the catalyst service life, improves energy utilization, and achieves stable operation of the reactor and energy saving and consumption reduction, which is suitable for large-scale industrial production.
Smart Images
Figure CN223263790U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of temperature-controlled reactors, in particular to a temperature-controlled reactor for preparing 6-aminocapronitrile. Background Art
[0002] Nylon 66, also known as polyhexamethylene adipamide, has excellent comprehensive properties such as shock resistance, heat resistance, wear resistance, and corrosion resistance. It is a high-end thermoplastic resin that is widely used in civilian silk, industrial silk, engineering plastics and other fields. Hexamethylenediamine is the key raw material for the production of nylon 66 salt; and the main source of hexamethylenediamine is 6-aminocapronitrile.
[0003] 6-Aminocapronitrile is an important chemical intermediate that can be hydrogenated to produce hexamethylenediamine. Therefore, the preparation of 6-aminocapronitrile is a key step in the nylon industry. The synthesis of 6-aminocapronitrile mainly uses caprolactam as the raw material and is prepared through an amination-dehydration reaction, which requires the use of a catalyst.
[0004] However, the reaction byproduct water will catalyze the polymerization of caprolactam, and the resulting polymer will clog the catalyst pores and reduce the activity of the catalyst; in addition, high-temperature reactions are prone to produce tar and carbon deposits, which cover the catalyst surface, further reducing the catalyst's active sites, causing the catalyst to gradually deactivate, and the reaction unit's operating stability is poor. Utility Model Content
[0005] The purpose of the utility model is to provide a temperature-controlled reactor for preparing 6-aminocapronitrile, which solves the problem in the prior art that the reaction by-product water catalyzes the polymerization of caprolactam, and the generated polymer blocks the catalyst pores and reduces the activity of the catalyst; in addition, the high-temperature reaction easily produces tar and carbon deposits, which cover the catalyst surface, further reducing the catalyst active sites, causing the catalyst to gradually deactivate, and the poor operating stability of the reaction device.
[0006] To achieve the above-mentioned objectives, the present invention provides a temperature-controlled reactor for preparing 6-aminocapronitrile, comprising an evaporation and gasification section, a mixed gas preheating section, a temperature-controlled reaction section, and a heat exchange section. The evaporation and gasification section comprises an evaporation section body, a jet mixing assembly, and a separation assembly. The mixed gas preheating section is arranged at the lower end of the evaporation and gasification section, the temperature-controlled reaction section is arranged below the mixed gas preheating section, the heat exchange section is arranged below the temperature-controlled reaction section, the jet mixing assembly and the separation assembly are respectively arranged on the evaporation section body, and the evaporation section body is arranged above the mixed gas preheating section.
[0007] The evaporation and gasification section further includes a first outer coil and two connecting pipes. The first outer coil is arranged around the outside of the evaporation section body, and the two connecting pipes are symmetrically arranged on both sides of the evaporation section body.
[0008] Among them, the temperature-controlled reaction section includes a temperature-controlled section body, a connecting pipe, a second outer coil and an inner coil. The temperature-controlled section body is arranged below the mixed gas preheating section, the connecting pipe is fixedly connected to the lower end of the temperature-controlled section body, the second outer coil is arranged around the outside of the temperature-controlled section body, and the inner coil is arranged inside the temperature-controlled section body.
[0009] In which, the jet mixing assembly includes two jet tubes and a mixing diffusion tube, the separation assembly includes a blade-type heavy component separation assembly, the two jet tubes are symmetrically arranged on the evaporation section body, the mixing diffusion tube is arranged on the evaporation section body and located above the two jet tubes, and the blade-type heavy component separation assembly is arranged on the evaporation section body and located above the mixing diffusion tube.
[0010] Among them, the mixer preheating section is a fixed tube plate type gas-liquid heat exchanger, and the heat exchange section is a fixed tube plate type gas-gas heat exchanger.
[0011] The utility model provides a temperature-controlled reactor for preparing 6-aminocapronitrile, wherein the mixed gas preheating section is arranged at the lower end of the evaporation and gasification section, the temperature-controlled reaction section is arranged below the mixed gas preheating section, the heat exchange section is arranged below the temperature-controlled reaction section, the jet mixing assembly and the separation assembly are respectively arranged on the evaporation section body, and the evaporation section body is arranged above the mixed gas preheating section. The raw material liquid enters the evaporation and gasification section at the upper section of the temperature-controlled reactor, and in the jet mixing assembly, the effective components in the raw material liquid are mixed with the raw material process gas, and evaporated, gasified, and mixed efficiently; the mixed gas realizes gas-liquid separation under the action of the separation assembly, and the heavy components brought into the raw material liquid are separated and discharged from the temperature-controlled reactor; the mixed gas descends from the top of the temperature-controlled reactor to the mixed gas preheating section, and under the action of the heat medium, the mixed gas is heated and directly enters the temperature-controlled reaction section for catalytic reaction, and the heat medium provides the heat source required for the reaction; the post-reaction gas enters the heat exchange section at the bottom, exchanges heat with the cold raw material gas, recovers heat, and is sent out of the temperature-controlled reactor. The device is a device for producing a saturated reactor with a high temperature and high efficiency. The device is a device for producing a saturated reactor with a high temperature and high efficiency. The device is a device for producing a saturated reactor with a high temperature and high efficiency. The device is a device for producing a saturated reactor with a high temperature and high efficiency. The device is a device for producing a saturated reactor with a high temperature and high efficiency. The device is a device for producing a saturated reactor with a high temperature and high efficiency. The device is a device for producing a saturated reactor with a high temperature and high efficiency. The device is a device for producing a saturated reactor with a high temperature and high efficiency. The device is a device for producing a saturated reactor with a high temperature and high efficiency. The device is a device for producing a saturated reactor with a high temperature and high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art.
[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model.
[0014] Figure 2 It is a partial side view of the utility model.
[0015] Figure 3 It is a structural diagram of the evaporation and gasification section of the utility model.
[0016] Figure 4 It is a structural diagram of the temperature-controlled reaction section of the present utility model.
[0017] 1-evaporation and gasification section, 2-mixed gas preheating section, 3-temperature control reaction section, 4-heat exchange section, 5-evaporation section body, 6-first outer coil, 7-connecting pipe, 8-temperature control section body, 9-connecting pipe, 10-second outer coil, 11-inner coil, 12-jet tube, 13-mixing diffusion tube, 14-blade type heavy component separation assembly. DETAILED DESCRIPTION
[0018] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be understood as limiting the present invention.
[0019] See also Figures 1 to 4 ,in, Figure 1 It is a schematic diagram of the overall structure of the utility model. Figure 2 It is a partial side view of the utility model. Figure 3 This is a structural diagram of the evaporation and gasification section 1 of the present invention. Figure 4 It is a structural diagram of the temperature-controlled reaction section 3 of the present utility model.
[0020] The utility model provides a temperature-controlled reactor for preparing 6-aminocapronitrile, comprising an evaporation and gasification section 1, a mixed gas preheating section 2, a temperature-controlled reaction section 3 and a heat exchange section 4, wherein the evaporation and gasification section 1 comprises an evaporation section main body 5, a jet mixing component and a separation component, wherein the mixed gas preheating section 2 is arranged at the lower end of the evaporation and gasification section 1, the temperature-controlled reaction section 3 is arranged below the mixed gas preheating section 2, the heat exchange section 4 is arranged below the temperature-controlled reaction section 3, the jet mixing component and the separation component are respectively arranged on the evaporation section main body 5, and the evaporation section main body 5 is arranged above the mixed gas preheating section 2; the evaporation and gasification section 1 further comprises a first outer coil 6 and two connecting pipes 7, wherein the first outer coil 6 is arranged around the outside of the evaporation section main body 5, and the two connecting pipes 7 are symmetrically arranged on both sides of the evaporation section main body 5; The temperature-controlled reaction section 3 includes a temperature-controlled section main body 8, a connecting pipe 9, a second outer coil 10 and an inner coil 11. The temperature-controlled section main body 8 is arranged below the mixed gas preheating section 2, and the connecting pipe 9 is fixedly connected to the lower end of the temperature-controlled section main body 8. The second outer coil 10 is arranged around the outside of the temperature-controlled section main body 8, and the inner coil 11 is arranged inside the temperature-controlled section main body 8; the jet mixing assembly includes two jet tubes 12 and a mixing diffusion tube 13, and the separation assembly includes a blade-type heavy component separation assembly 14. The two jet tubes 12 are symmetrically arranged on the evaporation section main body 5, and the mixing diffusion tube 13 is arranged on the evaporation section main body 5 and located above the two jet tubes 12. The blade-type heavy component separation assembly 14 is arranged on the evaporation section main body 5 and located above the mixing diffusion tube 13.
[0021] In this embodiment, the raw material liquid enters the evaporation and gasification section 1 at the upper section of the temperature-controlled reactor, and in the jet mixing assembly, the effective components in the raw material liquid are mixed with the raw material process gas, and are efficiently evaporated, gasified, and mixed; the mixed gas is separated into gas and liquid under the action of the separation assembly, and the heavy components brought into the raw material liquid are separated and discharged from the temperature-controlled reactor; the mixed gas descends from the top of the temperature-controlled reactor to the mixed gas preheating section 2, and under the action of the heat medium, the mixed gas is heated and directly enters the temperature-controlled reaction section 3 for catalytic reaction, and the heat medium provides the heat source required for the reaction; the post-reaction gas enters the heat exchange section 4 at the bottom, exchanges heat with the cold raw material gas, recovers heat, and is sent out of the temperature-controlled reactor; through the jet technology of the evaporation and gasification section 1, The technology can realize rapid saturated evaporation of raw liquid, ensure that the raw liquid and raw gas are fully mixed and evenly, separate the heavy components in time, avoid the occurrence of side reactions that lead to an increase in the pressure drop of the reactor bed, and extend the service life of the catalyst; the reaction temperature of each area inside the reactor is effectively controlled by the temperature-controlled reaction section 3, ensuring that the reaction temperature is stably and evenly distributed, effectively improving the conversion rate and selectivity of the reaction, and recovering the heat energy through the heat exchange section 4 to improve the energy utilization rate and achieve the purpose of energy saving and consumption reduction. The temperature-controlled reactor has strong comprehensive functions, compact structure, high safety, and is conducive to large-scale industrial production. The mixer preheating section is a fixed tube plate type gas-liquid heat exchanger, and the heat exchange section 4 is a fixed tube plate type gas-gas heat exchanger.
[0022] The above disclosure is merely one or more preferred embodiments of the present application and is not intended to limit the scope of the present application. A person skilled in the art will understand that all or part of the processes of the above embodiments and equivalent changes made in accordance with the claims of the present application are still within the scope of the present application.
Claims
1. A temperature-controlled reactor for preparing 6-aminocapronitrile, characterized in that It includes evaporation and gasification section, mixed gas preheating section, temperature control reaction section and heat exchange section; The evaporation and gasification section includes an evaporation section main body, a jet mixing assembly and a separation assembly. The mixed gas preheating section is arranged at the lower end of the evaporation and gasification section, the temperature control reaction section is arranged below the mixed gas preheating section, the heat exchange section is arranged below the temperature control reaction section, the jet mixing assembly and the separation assembly are respectively arranged on the evaporation section main body, and the evaporation section main body is arranged above the mixed gas preheating section.
2. The temperature-controlled reactor for preparing 6-aminocapronitrile as claimed in claim 1, wherein The evaporation and gasification section further includes a first outer coil and two connecting pipes. The first outer coil is arranged around the outside of the evaporation section body, and the two connecting pipes are symmetrically arranged on both sides of the evaporation section body.
3. The temperature-controlled reactor for preparing 6-aminocapronitrile as claimed in claim 2, wherein The temperature-controlled reaction section includes a temperature-controlled section body, a connecting pipe, a second outer coil and an inner coil. The temperature-controlled section body is arranged below the mixed gas preheating section. The connecting pipe is fixedly connected to the lower end of the temperature-controlled section body. The second outer coil is arranged around the outside of the temperature-controlled section body, and the inner coil is arranged inside the temperature-controlled section body.
4. The temperature-controlled reactor for preparing 6-aminocapronitrile as claimed in claim 3, wherein The jet mixing assembly includes two jet tubes and a mixing diffusion tube, and the separation assembly includes a blade-type heavy component separation assembly. The two jet tubes are symmetrically arranged on the evaporation section body, and the mixing diffusion tube is arranged on the evaporation section body and located above the two jet tubes. The blade-type heavy component separation assembly is arranged on the evaporation section body and located above the mixing diffusion tube.
5. The temperature-controlled reactor for preparing 6-aminocapronitrile as claimed in claim 4, wherein The mixed gas preheating section is a fixed tube plate type gas-liquid heat exchanger, and the heat exchange section is a fixed tube plate type gas-gas heat exchanger.