Reaction heat utilization device and cyclohexene preparation system
By designing a reaction heat recovery device in a chemical production plant, and using flash evaporation and a steam compressor to recover part of the hydrogenation reaction heat of benzene, the problem of unutilized reaction heat is solved, achieving efficient energy utilization and reaction safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CANGZHOU RISUN CHEMICAL LTD
- Filing Date
- 2025-06-19
- Publication Date
- 2026-06-12
AI Technical Summary
A large amount of reaction heat in chemical production plants is not utilized, resulting in energy waste, especially in the partial hydrogenation of benzene to produce cyclohexene.
A reaction heat utilization device was designed, including a hot water storage tank, a power pump, a flash tank, a steam compressor, and a heat exchanger. The reaction heat is absorbed by the cooling coil, and the reaction heat is recovered by flash evaporation and pressurization by the steam compressor and supplied to the heat-consuming equipment.
It effectively utilizes the heat of reaction, reduces energy waste, lowers investment in heat-using equipment, and improves reaction safety and system independence.
Smart Images
Figure CN224353297U_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of cyclohexene preparation technology, and particularly relates to a reaction heat utilization device and a cyclohexene preparation system. Background Technology
[0002] Currently, some chemical production facilities have increasingly stringent requirements for low energy consumption, yet a significant amount of reaction heat in these facilities remains unused, resulting in substantial energy waste. For example, the heat of reaction in the partial hydrogenation of benzene to cyclohexene is largely unutilized, leading to a significant heat loss in this process. Utility Model Content
[0003] In view of the above-mentioned problems existing in the prior art, the purpose of this utility model embodiment is to provide a reaction heat utilization device and a cyclohexene preparation system.
[0004] The technical solution adopted in this embodiment of the utility model is:
[0005] A reaction heat utilization device is used in a benzene partial hydrogenation reactor, the benzene partial hydrogenation reactor having a cooling coil, the reaction heat utilization device comprising:
[0006] Except for hot water storage tanks;
[0007] A power pump is connected to the outlet of the hot water storage tank and the inlet of the cooling coil; a flash tank is connected to the outlet of the cooling coil.
[0008] A steam compressor, wherein the inlet of the steam compressor is connected to the steam outlet of the flash tank, and the outlet of the steam compressor is used to connect to heat-using equipment.
[0009] In some embodiments, a heat exchanger is further included, wherein the heat medium inlet of the heat exchanger is connected to the condensate outlet of the flash tank via an inlet water pipe, and the heat medium outlet of the heat exchanger is connected to the dewatering water storage tank via an outlet water pipe.
[0010] In some embodiments, a regulating pipeline is further included, which connects the inlet pipeline and the outlet pipeline. The regulating pipeline is provided with a regulating valve, and adjusting the opening degree of the regulating valve can adjust the flow rate of the liquid entering the regulating pipeline.
[0011] In some embodiments, there are multiple benzene partial hydrogenation reactors, with the inlets of the cooling coils of the multiple benzene partial hydrogenation reactors respectively connected to the outlets of the hot water storage tank, and the outlets of the cooling coils of the multiple benzene partial hydrogenation reactors respectively connected to the feed inlets of the flash tank.
[0012] In some embodiments, the demineralized water storage tank is provided with a demineralized water pipeline, through which demineralized water can be injected into the demineralized water storage tank.
[0013] In some embodiments, the heat exchanger is a plate heat exchanger or a shell-and-tube heat exchanger.
[0014] In some embodiments, the steam compressor is a centrifugal compressor.
[0015] A cyclohexene preparation system, comprising:
[0016] Benzene partial hydrogenation reactor;
[0017] The reaction heat utilization device described in any of the above embodiments.
[0018] Compared with the prior art, the beneficial effects of the embodiments of this utility model are as follows:
[0019] The reaction heat recovery device in this embodiment absorbs the reaction heat in the reactor by introducing deheated water into the cooling coil. The extracted heat is then flashed in a flash tank, and the resulting low-pressure flash steam is pressurized to a predetermined pressure by a steam compressor and sent to the heat-using equipment. This not only effectively utilizes the reaction heat in the preparation of cyclohexene but also recovers the reaction heat through flash steam pressurization, which is beneficial for the use of heat-using equipment and reduces investment in it. Furthermore, it minimizes the correlation between the reaction heat recovery system and other heat-using systems, ensuring the safety of the reaction.
[0020] It should be understood that the foregoing general description and the following detailed description are exemplary and illustrative only, and are not intended to limit the present invention.
[0021] The overview of various implementations or examples of the technology described in this utility model is not a complete disclosure of the full scope or all features of the disclosed technology. Attached Figure Description
[0022] In drawings that are not necessarily drawn to scale, the same reference numerals may describe similar parts in different views. The drawings generally illustrate various embodiments by way of example rather than limitation and, together with the description and claims, serve to explain embodiments of the utility model. Where appropriate, the same reference numerals are used in all drawings to refer to the same or similar parts.
[0023] Figure 1 This is a schematic diagram of the reaction heat utilization device according to an embodiment of the present invention.
[0024] In the diagram: 1. Hot water storage tank; 2. Benzene partial hydrogenation reactor; 3. Flash tank; 4. Steam compressor; 5. Heat exchanger; 6. Control valve; 7. Inlet water pipeline; 8. Outlet water pipeline; 9. Power pump; 10. Demineralized water pipeline; 11. Control pipeline. Detailed Implementation
[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model without creative effort are within the scope of protection of this utility model.
[0026] Unless otherwise defined, the technical or scientific terms used in this utility model shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar words used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly. To keep the following description of the embodiments of this utility model clear and concise, detailed descriptions of known functions and known components are omitted.
[0027] This utility model embodiment provides a reaction heat utilization device for a benzene partial hydrogenation reactor 2. The benzene partial hydrogenation reactor 2 has a cooling coil (not shown in the figure). The interior of the benzene partial hydrogenation reactor 2 is used for the partial hydrogenation reaction of benzene to generate cyclohexene. A large amount of heat is generated during the reaction process, namely the reaction heat.
[0028] like Figure 1 As shown, the reaction heat utilization device in this embodiment includes a hot water storage tank 1, a power pump 9, a flash tank 3, and a steam compressor 4.
[0029] The deionized water storage tank 1 is used to store deionized water. The deionized water can be understood as cooling water, which can be pure water or demineralized water. This embodiment uses demineralized water as an example for illustration.
[0030] The power pump 9 is connected to the outlet of the dehydrated water storage tank 1 and the inlet of the cooling coil on the benzene partial hydrogenation reactor 2. The power pump 9 is used to inject the dehydrated water from the dehydrated water storage tank 1 into the cooling coil on the benzene partial hydrogenation reactor 2 to absorb the heat of reaction in the benzene partial hydrogenation reactor 2, thereby forming high-temperature dehydrated water.
[0031] The feed inlet of flash tank 3 is connected to the water outlet of cooling coil, the steam outlet of flash tank 3 is connected to the air inlet of steam compressor 4, and the air outlet of steam compressor 4 is connected to the heat-using equipment. Steam compressor 4 can be a centrifugal compressor.
[0032] The high-temperature demineralized water, having absorbed the heat of reaction, then enters flash tank 3 for flash evaporation. Low-pressure flash steam is discharged through the steam port of flash tank 3. This low-pressure flash steam is then pressurized by steam compressor 4 to form high-pressure flash steam or flash steam at a specified pressure, which is then sent out for use by heat-consuming equipment. The function of flash tank 3 is to transform high-pressure saturated water into a relatively low-pressure container due to the sudden pressure drop, resulting in a portion of the saturated water becoming saturated water vapor and saturated water at the container pressure. The structure of flash tank 3 is existing technology and will not be described in detail.
[0033] The reaction heat recovery device in this embodiment absorbs the reaction heat in the reactor by introducing deheated water into the cooling coil. The extracted heat is then flashed through flash tank 3, and the resulting low-pressure flash steam is pressurized to a predetermined pressure by steam compressor 4 before being sent to the heat-using equipment. This not only effectively utilizes the reaction heat in the preparation of cyclohexene but also recovers the reaction heat through flash steam pressurization, which is beneficial for the use of heat-using equipment and reduces investment in it. Furthermore, it minimizes the correlation between the reaction heat recovery system and other heat-using systems, ensuring the safety of the reaction.
[0034] like Figure 1 As shown, in some embodiments, the reaction heat utilization device may further include a heat exchanger 5. The heat medium inlet of the heat exchanger 5 is connected to the condensate outlet of the flash tank 3 via an inlet water pipe 7, and the heat medium outlet of the heat exchanger 5 is connected to the deheated water storage tank 1 via an outlet water pipe 8. The cold medium inlet and cold medium outlet of the heat exchanger 5 are connected to a cooling water circulation pipeline (not shown in the figure).
[0035] That is, high-temperature demineralized water that has not undergone flash evaporation flows in the hot medium channel of heat exchanger 5, while cooling water flows in the cold medium channel of heat exchanger 5. The high-temperature demineralized water can exchange heat with the cooling water.
[0036] As for the type of heat exchanger 5, this embodiment does not make specific limitations; it can be a plate cooler or a shell-and-tube cooler.
[0037] The high-temperature demineralized water that has not undergone flash evaporation in flash tank 3 is cooled into low-temperature dehydrated water in heat exchanger 5 and then re-enters dehydrated water storage tank 1 for reuse. This cycle continues. This method makes better use of the heat of reaction and saves energy compared to existing technologies.
[0038] like Figure 1 As shown, in some embodiments, the reaction heat utilization device may further include a regulating pipeline 11. The regulating pipeline 11 connects the inlet pipeline 7 and the outlet pipeline 8, and is equipped with a regulating valve 6. The flow rate of demineralized water entering the regulating pipeline 11 can be adjusted by controlling the opening and closing degree of the regulating valve 6. That is, the high-temperature demineralized water that has not undergone flash evaporation in the flash tank 3 can be divided into two parts: one part enters the heat exchanger 5 for cooling and then flows into the demineralized water storage tank 1; the other part can also flow into the demineralized water storage tank 1 through the regulating pipeline 11.
[0039] This structure can be used to adjust the temperature of the demineralized water in the flash tank 3. For example, when the temperature of the demineralized water in the hot water storage tank 1 is too high, the regulating valve 6 can be closed or the opening degree of the regulating valve 6 can be reduced so that more of the high-temperature demineralized water that has not undergone flash evaporation enters the heat exchanger 5 for cooling or all of it enters the heat exchanger 5 for cooling, and then flows into the hot water storage tank 1 to reduce the overall temperature of the demineralized water.
[0040] For example, in the reaction heat recovery unit, the temperature of the demineralized water in the deheated water storage tank 1 can be controlled at 40℃-50℃. After being sent to the cooling coil of the benzene partial hydrogenation reactor 2, the temperature of the deheated high-temperature demineralized water can be raised to 120℃-125℃, and then it enters the flash tank 3 for flash evaporation. During this process, the operating temperature of the flash tank 3 is 90℃ and the pressure is 70 kPaA. Finally, the low-pressure flash vapor is pressurized to 0.4 MPaA and the temperature is 145℃ by the steam compressor 4.
[0041] like Figure 1 As shown, in some embodiments, the hot water storage tank 1 can be used to hold demineralized water, and a demineralized water pipeline 10 can be connected to the hot water storage tank 1. The demineralized water pipeline 10 can be connected to equipment for generating or preparing demineralized water, thereby replenishing the demineralized water in the hot water storage tank 1 in a timely manner.
[0042] In some embodiments, the number of benzene partial hydrogenation reactors 2 can be multiple. For example, there can be 2, 3, or 4.
[0043] For example, such as Figure 1As shown, there can be two benzene partial hydrogenation reactors 2. The inlets of the cooling coils of the two benzene partial hydrogenation reactors 2 can be connected to the outlets of the hot water storage tank 1, and the outlets of the cooling coils of the two benzene partial hydrogenation reactors 2 can be connected to the inlets of the flash tank 3. In this way, the reaction heat of the two benzene partial hydrogenation reactors 2 can be utilized.
[0044] This invention also provides a cyclohexene preparation system, which may include a benzene partial hydrogenation reactor 2 and the reaction heat utilization device described in any of the above embodiments. The benzene partial hydrogenation reactor 2 has a cooling coil, and its interior is used for the partial hydrogenation reaction of benzene to produce cyclohexene. A large amount of heat, i.e., reaction heat, is generated during the reaction process.
[0045] The above description is intended to be illustrative and not restrictive. Those skilled in the art can make variations, modifications, substitutions, and alterations to the above embodiments within the scope of this disclosure. Moreover, the above examples (or one or more of them) can be used in combination with each other, and these embodiments can be combined with each other in various combinations or arrangements.
Claims
1. A reaction heat utilization device for a benzene partial hydrogenation reactor, said benzene partial hydrogenation reactor having a cooling coil, characterized in that, The reaction heat utilization device includes: Except for hot water storage tanks; A power pump is connected to the outlet of the hot water storage tank and the inlet of the cooling coil. A flash tank, wherein the inlet of the flash tank is connected to the outlet of the cooling coil; A steam compressor, wherein the inlet of the steam compressor is connected to the steam outlet of the flash tank, and the outlet of the steam compressor is used to connect to heat-using equipment.
2. The reaction heat utilization device as described in claim 1, characterized in that, It also includes a heat exchanger, wherein the heat medium inlet of the heat exchanger is connected to the condensate outlet of the flash tank via an inlet water pipe, and the heat medium outlet of the heat exchanger is connected to the dewatering water storage tank via an outlet water pipe.
3. The reaction heat utilization device as described in claim 2, characterized in that, It also includes a regulating pipeline, which connects the inlet pipeline and the outlet pipeline. The regulating pipeline is equipped with a regulating valve, and adjusting the opening degree of the regulating valve can adjust the flow rate of the liquid entering the regulating pipeline.
4. The reaction heat utilization device as described in claim 1, characterized in that, The number of benzene partial hydrogenation reactors is multiple, and the inlets of the cooling coils of the multiple benzene partial hydrogenation reactors are respectively connected to the outlets of the hot water storage tank, and the outlets of the cooling coils of the multiple benzene partial hydrogenation reactors are respectively connected to the inlets of the flash tank.
5. The reaction heat utilization device as described in claim 1, characterized in that, The demineralized water storage tank is equipped with a demineralized water pipeline, through which demineralized water can be injected into the demineralized water storage tank.
6. The reaction heat utilization device as described in claim 2, wherein the heat exchanger is a plate heat exchanger or a shell-and-tube heat exchanger.
7. The reaction heat utilization device as described in claim 1, wherein the steam compressor is a centrifugal compressor.
8. A cyclohexene preparation system, characterized in that, include: Benzene partial hydrogenation reactor; The reaction heat utilization device according to any one of claims 1-7.