Hydration reactor energy-saving system
By employing heat recovery energy-saving technology and a two-stage hydration reactor design, the material is preheated and the temperature is controlled using low-temperature condensate, which solves the problem of reactor temperature fluctuation caused by the temperature difference between cyclohexene and high-purity water, thereby improving production efficiency.
Patent Information
- Application Number
- CN202520206735.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-10
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2035-02-10
AI Technical Summary
The large temperature difference between cyclohexene and high-purity water in the hydration reactor leads to significant temperature fluctuations in the reactor, generating byproducts and affecting production efficiency.
The heat recovery energy-saving and consumption-reducing technology is adopted, which uses the heat of low temperature condensate to preheat cyclohexene and high-purity water, reducing the use of heating steam in the reactor. The temperature is controlled by a two-stage hydration reactor design and steam cooling in different directions.
It effectively stabilizes reactor temperature, reduces byproduct formation, and improves production efficiency.
Smart Images
Figure CN223818635U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of energy-saving optimization and transformation of chemical steam and condensate, and specifically relates to an energy-saving system for a hydration reactor. Background Technology
[0002] In the cyclohexanol hydration reactor, cyclohexene and high-purity water undergo a hydration reaction in the presence of a hydration catalyst to produce cyclohexanol. The hydration reactor is the core equipment of the cyclohexanol production unit, consisting of two parts: a lower mixing reaction zone for the hydration reactants and an upper settling zone for the catalyst slurry in the reaction oil phase. To reduce the impact of material flow generated by the circulating agitation in the reaction zone on the upper settling zone, a baffle plate is installed between the reaction zone and the settling zone, and a grid plate is installed in the upper settling zone to ensure the static separation of the reaction oil phase and the hydration catalyst in the settling zone. Simultaneously, to maintain the temperature of the hydration reaction, a medium-pressure steam heating coil and a cooling water cooling coil are installed inside the reactor. The reaction products contain cyclohexanol and trace amounts of impurities such as methylcyclopentene, methylcyclopentanol, and dicycloethyl ether. The reaction products are easily affected by fluctuations in temperature and pressure; therefore, it is necessary to maintain the appropriate temperature and pressure for the reaction. However, in actual production, due to the large temperature difference between the cyclohexene and high-purity water entering the reactor and the reaction temperature, it is urgent to implement energy-saving technology transformation of the hydration reactor to achieve the stability of the hydration reactor, avoid the direct entry of cold materials into the reactor causing large temperature changes, reduce the generation of by-products, and greatly improve production efficiency. Utility Model Content
[0003] The purpose of this invention is to address the problems mentioned above by providing an energy-saving system for a hydration reactor. This system utilizes heat recovery technology to fully leverage the heat from the low-temperature condensate, while indirectly reducing the amount of heating steam used in the reactor. This prevents cold materials from directly entering the reactor, which could lead to significant temperature fluctuations and reduces the generation of byproducts, thereby greatly improving production efficiency.
[0004] To achieve the above objectives, the specific solution adopted by this utility model is as follows:
[0005] An energy-saving system for a hydration reactor includes a hydration reactor, a cyclohexene feed pump, a high-purity water feed pump, a high-purity water feed heat exchanger, and a cyclohexene feed heat exchanger. The cyclohexene feed pump is connected to the tube-side inlet of the cyclohexene feed heat exchanger via a pipeline. The high-purity water feed pump is connected to the tube-side inlet of the high-purity water feed heat exchanger via a pipeline. The tube-side outlets of the high-purity water feed heat exchanger and the cyclohexene feed heat exchanger are respectively connected to the inlet of the hydration reactor via pipelines. The shell-side inlet of the cyclohexene feed heat exchanger is connected to the low-temperature condensate main pipe. The shell-side outlet of the cyclohexene feed heat exchanger is connected to the shell-side inlet of the high-purity water feed heat exchanger via a pipeline. The shell-side outlet of the high-purity water feed heat exchanger is connected to the low-temperature condensate network via a pipeline.
[0006] Furthermore, the hydration reactor includes a first hydration reactor and a second hydration reactor. The tube-side outlet of the cyclohexene feed heat exchanger is connected to the inlet of the first hydration reactor via a pipeline. The tube-side outlet of the high-purity water feed heat exchanger has two branches, one of which is connected to the inlet of the first hydration reactor and the other of which is connected to the inlet of the second hydration reactor. The outlet of the first hydration reactor is connected to the inlet of the second hydration reactor via a pipeline. The second hydration reactor has a discharge port.
[0007] Furthermore, the first hydration reactor and the second hydration reactor have the same structure, both equipped with a stirrer, an overflow weir, and a coil. The material in the first hydration reactor flows to the second hydration reactor through the overflow weir via a height difference.
[0008] Furthermore, the coils in both the first and second hydration reactors are heated by medium-pressure steam and cooled by cooling water. The medium-pressure steam or cooling water in the coils of the first hydration reactor is introduced from the top and discharged from the bottom, while the medium-pressure steam or cooling water in the coils of the second hydration reactor is introduced from the bottom and discharged from the top.
[0009] Furthermore, the tops of the first hydration reactor and the second hydration reactor are respectively connected to nitrogen pipelines, thereby maintaining the pressure inside the reactor through nitrogen at the top. When the pressure is low, nitrogen is added, and when the pressure is high, the gas inside the hydration reactor is discharged to the tail gas treatment.
[0010] This invention utilizes heat recovery and energy-saving technology to fully leverage the heat of low-temperature condensate and reduce the amount of heating steam used in the reactor. This avoids the direct entry of cold materials into the reactor, which could lead to significant temperature fluctuations and reduces the generation of byproducts, thereby greatly improving production efficiency. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of the structure of this utility model.
[0012] In the diagram: 1. Cyclohexene feed pump, 2. High-purity water feed pump, 3. Cyclohexene feed heat exchanger, 4. High-purity water feed heat exchanger, 5. Internal coil of the first hydration reactor, 6. Internal agitator of the first hydration reactor, 7. First hydration reactor, 8. Internal coil of the second hydration reactor, 9. Internal agitator of the second hydration reactor, 10. Second hydration reactor. Detailed Implementation
[0013] The present invention will be further described below with reference to the accompanying drawings.
[0014] Example 1
[0015] An energy-saving system for a hydration reactor, such as Figure 1 As shown, the reactor includes a cyclohexene feed pump 1, a high-purity water feed pump 2, a cyclohexene feed heat exchanger 3, a high-purity water feed heat exchanger 4, a first hydration reactor 7, and a second hydration reactor 10. The cyclohexene feed pump 1 is connected to the tube-side inlet of the cyclohexene feed heat exchanger 3 via a pipeline. The high-purity water feed pump 2 is connected to the tube-side inlet of the high-purity water feed heat exchanger 4 via a pipeline. The tube-side outlet of the high-purity water feed heat exchanger 4 has two branches: one branch is connected to the inlet of the first hydration reactor 7, and the other branch is connected to the inlet of the second hydration reactor 10. The outlet of the first hydration reactor 7... The inlet of the second hydration reactor 10 is connected via a pipeline. The second hydration reactor 10 is equipped with a discharge port and a discharge pipeline. A discharge valve is installed on the discharge pipeline. The shell-side inlet of the cyclohexene feed heat exchanger 3 is connected to the low-temperature condensate main pipe. The shell-side outlet of the cyclohexene feed heat exchanger 3 is connected to the shell-side inlet of the high-purity water feed heat exchanger 4 via a pipeline. This allows the low-temperature condensate to heat the cyclohexene in the cyclohexene feed heat exchanger 3 and then enter the high-purity water feed heat exchanger 4 to heat the high-purity water. The shell-side outlet of the high-purity water feed heat exchanger 4 is connected to the low-temperature condensate pipeline network via a pipeline.
[0016] The first hydration reactor 7 and the second hydration reactor 10 have the same structure. The first hydration reactor 7 is equipped with an internal coil 5, an internal agitator 6, and an overflow weir. The material in the first hydration reactor 7 flows to the second hydration reactor 10 through the overflow weir via a height difference. The second hydration reactor 10 is equipped with an internal coil 8, an internal agitator 9, and an overflow weir.
[0017] Both the internal coil 5 of the first hydration reactor and the internal coil 8 of the second hydration reactor are heated by medium-pressure steam and cooled by cooling water. The medium-pressure steam or cooling water in the internal coil 5 of the first hydration reactor is introduced from the top and discharged from the bottom, while the medium-pressure steam or cooling water in the internal coil 8 of the second hydration reactor is introduced from the bottom and discharged from the top.
[0018] The tops of the first hydration reactor 7 and the second hydration reactor 10 are respectively connected to nitrogen pipelines, thereby maintaining the pressure inside the reactors through nitrogen at the top. When the pressure is low, nitrogen is added, and when the pressure is high, the gas inside the hydration reactors is discharged to the tail gas treatment.
[0019] Actual workflow: Cyclohexene from the outlet of cyclohexene feed pump 1 is heated by cyclohexene feed heat exchanger 3 and enters the first hydration reactor 7. High-purity water from the outlet of high-purity water feed pump 2 is preheated to approximately 50°C by tube-pass high-purity water feed heat exchanger 4 and then enters the first hydration reactor 7 and the second hydration reactor 10 respectively. The preheated cyclohexene (approximately 100°C) reacts with high-purity water in the first hydration reactor 7 by thorough stirring by the internal agitator 6. The temperature in the first hydration reactor 7 is controlled by the internal coil 5 of the first hydration reactor through the control of the amount of medium-pressure steam or cooling water used. After the material in the first hydration reactor 7 has reacted sufficiently, it flows upwards and enters the second hydration reactor 10 through a pressure difference. In the second hydration reactor 10, the material is thoroughly stirred by the internal agitator 8. The temperature in the second hydration reactor 10 is controlled by the internal coil 10 through the control of the medium-pressure steam usage or cooling water usage. Low-temperature condensate (approximately 130°C) is introduced into the shell-side inlet of the cyclohexene feed heat exchanger 3. Low-temperature condensate (approximately 110°C) exiting the shell-side outlet of the cyclohexene feed heat exchanger 3 enters the high-purity water feed heat exchanger 4 through its shell-side inlet. Low-temperature condensate (approximately 100°C) exiting the shell-side outlet of the high-purity water feed heat exchanger 4 returns to the low-temperature condensate network. The pressure inside the first hydration reactor 7 and the second hydration reactor 10 is maintained by nitrogen at the top. When the pressure is low, nitrogen can be added; when the pressure is high, the gas inside the reactor is discharged to the tail gas treatment system.
[0020] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the specific implementation of this utility model and not to limit it. Those skilled in the art should understand that any equivalent substitutions or obvious modifications made to the implementation of this utility model without changing its performance or use, without violating the spirit of this utility model, should be covered within the scope of protection claimed by this utility model.
Claims
1. An energy-saving system for a hydration reactor, characterized in that, It includes a hydration reactor, a cyclohexene feed pump, a high-purity water feed pump, a high-purity water feed heat exchanger, and a cyclohexene feed heat exchanger. The cyclohexene feed pump is connected to the tube-side inlet of the cyclohexene feed heat exchanger via a pipeline. The high-purity water feed pump is connected to the tube-side inlet of the high-purity water feed heat exchanger via a pipeline. The tube-side outlets of the high-purity water feed heat exchanger and the cyclohexene feed heat exchanger are respectively connected to the inlet of the hydration reactor via pipelines. The shell-side inlet of the cyclohexene feed heat exchanger is connected to the low-temperature condensate main pipe. The shell-side outlet of the cyclohexene feed heat exchanger is connected to the shell-side inlet of the high-purity water feed heat exchanger via a pipeline. The shell-side outlet of the high-purity water feed heat exchanger is connected to the low-temperature condensate network via a pipeline.
2. The energy-saving system for the hydration reactor according to claim 1, characterized in that, The hydration reactor includes a first hydration reactor and a second hydration reactor. The tube-side outlet of the cyclohexene feed heat exchanger is connected to the inlet of the first hydration reactor via a pipeline. The tube-side outlet of the high-purity water feed heat exchanger has two branches, one of which is connected to the inlet of the first hydration reactor and the other of which is connected to the inlet of the second hydration reactor. The outlet of the first hydration reactor is connected to the inlet of the second hydration reactor via a pipeline. The second hydration reactor has a discharge port.
3. The energy-saving system for the hydration reactor according to claim 2, characterized in that, The first hydration reactor and the second hydration reactor have the same structure. Both are equipped with a stirrer, an overflow weir, and a coil. The material in the first hydration reactor flows to the second hydration reactor through the overflow weir by a difference in elevation.
4. The energy-saving system for the hydration reactor according to claim 3, characterized in that, Both the first and second hydration reactors use medium-pressure steam for heating and cooling water for cooling. The medium-pressure steam or cooling water in the first hydration reactor coil is introduced from the top and exited from the bottom, while the medium-pressure steam or cooling water in the second hydration reactor coil is introduced from the bottom and exited from the top.
5. The energy-saving system for the hydration reactor according to claim 2, characterized in that, The tops of the first and second hydration reactors are connected to nitrogen pipelines, thereby maintaining the pressure inside the reactors with nitrogen from the top. When the pressure is low, nitrogen is added, and when the pressure is high, the gas inside the hydration reactors is discharged to the tail gas treatment system.