Hydrogenation catalyst filtering and recycling system
Through the design of hydrogenation catalyst filtering and recycling system in the production process of cyclorax, the problem of the loss of precious metal catalysts was solved, and the effective recovery of catalysts and reduced production costs were achieved.
Patent Information
- Application Number
- CN202420493435.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-14
- Publication Date
- 2025-01-28
- Estimated Expiration
- 2034-03-14
AI Technical Summary
In the existing cyclohexanol production process, precious metal catalysts are easily lost during the hydrogenation reaction, resulting in high production costs and unstable equipment.
Design a hydrogenation catalyst filtering and recycling system, including hydrogenation steamer, gas condenser, and liquid condenser. The filter after the hydrogen flashing steaming tank is set to separate and recycle the hydrogenation catalyst to reduce the loss of catalysts.
Effectively separate the recovery of hydrogenation catalysts, reduce production costs, and ensure the stable operation of hydrogenation reactor and refined separation tower.
Smart Images
Figure CN222400263U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of chemical industry, in particular to a hydrogenation catalyst filtering and recovery system. Background Art
[0002] At present, the domestic cyclohexanol production process generally adopts the method of using a benzene partial hydrogenation catalyst to convert benzene into cyclohexene, and cyclohexene then reacts with water under the action of a hydrogenation catalyst to produce cyclohexanol. The catalyst for the selective hydrogenation of benzene to cyclohexene uses zirconium dioxide as a carrier or dispersant, ruthenium as an active component, and zinc as a co-catalyst. Both ruthenium and zirconium are valuable metals, especially ruthenium. The ruthenium and zirconium used to manufacture catalysts are expensive, making the manufacturing cost of the catalyst very high. The benzene partial hydrogenation reaction equipment in the hydration method cyclohexanol production process is a fully mixed kettle reactor using a gas-liquid-solid three-phase reaction. The recycling of the hydrogenation catalyst is separated in the hydrogenation settler based on the specific gravity difference. The separation condition of the settler is affected by factors such as interface parameter control, production load, and catalyst particle size changes. Due to incomplete sedimentation separation, a small amount of hydrogenation catalyst enters the subsequent system along with the products of the benzene hydrogenation reaction, resulting in the loss of precious metal catalysts. Utility Model Content
[0003] In order to solve the above problems, the operating conditions of the hydrogenation reactor require a certain temperature of 130~160℃, and a certain amount of hydrogen is required to maintain the reaction pressure at 4.0~6.0MPa. A hydrogenation catalyst filtering and recovery device is set between the outlet of the hydrogenation reactor and the refining separation tower, which can recover the hydrogenation catalyst flowing out of the hydrogenation reactor, reduce production costs, and maintain the stable operation of the device. Therefore, the utility model provides a hydrogenation catalyst filtering and recovery system, which is simple to operate, stable in operation, leak-free, easy to operate, safe and reliable, and has low investment during implementation.
[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:
[0005] A hydrogenation catalyst filtering and recovery system comprises a hydrogenation flash tank, a gas phase condenser and a liquid phase condenser. The hydrogenation flash tank is provided with a gas phase outlet, a liquid phase outlet and a condensate reflux port. The gas phase outlet is connected to an inlet of the gas phase condenser through a pipeline. The outlet of the gas phase condenser is connected to fuel gas through a pipeline and a gas outlet valve at the top of the hydrogenation flash tank arranged on the pipeline. Two pipelines are provided in parallel at the liquid phase outlet. A hydrogenation flash tank No. 1 filter and a hydrogenation flash tank No. 2 filter are respectively arranged on the two pipelines so as to collect part of the hydrogenation catalyst and hydrogenation products and discharge them to a catalyst recovery place. The two pipelines are connected to the inlet of the liquid phase condenser, and the outlet of the liquid phase condenser is connected to a refining separation tower.
[0006] Furthermore, the gas phase condenser is provided with a gas phase outlet and an oil phase outlet. The gas phase outlet of the gas phase condenser is connected to the fuel gas through a pipeline and an outlet valve at the top of the hydrogenation flash tank arranged on the pipeline, and the oil phase outlet is connected to the condensate reflux port of the hydrogenation flash tank through a pipeline.
[0007] Furthermore, the hydrogenation flash tank is also provided with a pressure gauge and a liquid level gauge.
[0008] Furthermore, a gas phase flow meter is provided on the pipeline between the gas phase condenser and the gas outlet valve at the top of the hydrogenation flash tank. The pressure gauge, the gas phase flow meter and the gas outlet valve at the top of the hydrogenation flash tank are controlled in cascade, so that the size of the pressure gauge is controlled by controlling the size of the gas phase flow meter through the gas outlet valve at the top of the hydrogenation flash tank.
[0009] Furthermore, a liquid phase flow meter and a middle discharge valve of the hydrogenation flash tank are provided on the pipeline between the liquid phase condenser and the refining separation tower. The liquid level meter, the liquid phase flow meter and the middle discharge valve of the hydrogenation flash tank are cascade controlled so that the size of the liquid phase flow meter is controlled by the middle discharge valve of the hydrogenation flash tank and then the size of the liquid level meter is controlled.
[0010] Furthermore, the inlet and outlet of the hydrogenation flash tank 1# filter and the inlet and outlet of the hydrogenation flash tank 2# filter are both provided with valves and pressure gauges.
[0011] The utility model has a simple structure and low operating cost, can effectively separate and recover the hydrogenation catalyst and ensure the stable operation of the hydrogenation reactor and the refining separation tower. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a structural schematic diagram of the utility model.
[0013] In the figure: 1. Hydrogenation flash tank, 11. Top outlet valve of hydrogenation flash tank, 12. Gas flow meter, 13. Pressure gauge, 14. Liquid level meter, 15. Liquid flow meter, 16. Middle outlet valve of hydrogenation flash tank, 2. Gas condenser, 3. Liquid condenser, 4. 1# filter of hydrogenation flash tank, 5. 2# filter of hydrogenation flash tank. DETAILED DESCRIPTION
[0014] The utility model will be further described below in conjunction with the accompanying drawings.
[0015] A hydrogenation catalyst filtration and recovery system, such as Figure 1As shown, it includes a hydrogenation flash tank 1, a gas phase condenser 2 and a liquid phase condenser 3. The hydrogenation flash tank 1 is provided with a gas phase outlet, a liquid phase outlet, a condensate reflux port, a pressure gauge 13 and a liquid level gauge 14. The gas phase outlet is connected to the inlet of the gas phase condenser 2 through a pipeline. The gas phase condenser 2 is provided with a gas phase outlet and an oil phase outlet. The gas phase outlet of the gas phase condenser 2 is connected to the fuel gas through a pipeline and a gas outlet valve 11 at the top of the hydrogenation flash tank arranged on the pipeline. The oil phase outlet of the gas phase condenser 2 is connected to the condensate reflux port of the hydrogenation flash tank 1 through a pipeline. The liquid phase outlet of the hydrogenation flash tank 1 is provided with two pipelines in parallel. The two pipelines are respectively provided with a hydrogenation flash tank 1# filter 4 and a hydrogenation flash tank 2# filter 5 so as to collect part of the hydrogenation catalyst and hydrogenation products and discharge them to the catalyst recovery place. The two pipelines are connected to the inlet of the liquid phase condenser 3, and the outlet of the liquid phase condenser 3 is connected to the refining separation tower.
[0016] Among them, a gas phase flowmeter 12 is also provided on the pipeline between the gas phase condenser 2 and the gas outlet valve 11 at the top of the hydrogenation flash tank. The pressure gauge 13, the gas phase flowmeter 12 and the gas outlet valve 11 at the top of the hydrogenation flash tank are cascade controlled, so that the size of the pressure gauge 13 is controlled by controlling the size of the gas phase flowmeter 12 through the gas outlet valve 11 at the top of the hydrogenation flash tank.
[0017] Among them, a liquid phase flowmeter 15 and a hydrogenation flash tank middle discharge valve 16 are provided on the pipeline between the liquid phase condenser 3 and the refining separation tower. The liquid level meter 14, the liquid phase flowmeter 15 and the hydrogenation flash tank middle discharge valve 16 are cascade controlled so that the size of the liquid phase flowmeter 15 is controlled by the hydrogenation flash tank middle discharge valve 16 and then the size of the liquid level meter 14 is controlled.
[0018] The inlet and outlet pipes of the hydrogenation flash tank 1# filter 4 are respectively provided with a hydrogenation flash tank 1# filter front valve and a hydrogenation flash tank 1# filter rear valve. The inlet and outlet pipes of the hydrogenation flash tank 2# filter 5 are respectively provided with a hydrogenation flash tank 2# filter front valve and a hydrogenation flash tank 2# filter rear valve.
[0019] First, the reaction product received from the hydrogenation reactor has a temperature of 130-160°C and a pressure of 4.0-6.0 MPa, and contains substances such as cyclohexene, cyclohexane, unreacted benzene and dissolved hydrogen, and is supplied to the hydrogenation flash tank 1. The liquid and gas are separated through the hydrogenation flash tank 1, and the gas is discharged from the top of the hydrogenation flash tank 1. It is cooled from 130-160°C to 15-30°C in the gas phase condenser 2. After the oil traveling with the gas is condensed and recovered, the pressure of the hydrogenation flash tank 1 is maintained constant by cascade control of the gas outlet valve 11 at the top of the hydrogenation flash tank, the gas phase flowmeter 12 and the pressure gauge 13 on the hydrogenation flash tank 1, and then discharged to the fuel gas distribution pipe.
[0020] Secondly, a small amount of hydrogenation catalyst is not completely separated by sedimentation, and enters the subsequent system with the products of benzene hydrogenation reaction, causing the loss of precious metal catalyst. In order to prevent the loss of hydrogenation catalyst to the refining separation tower, two filters are installed after the hydrogenation flash tank 1, namely, hydrogenation flash tank 1# filter 4 and hydrogenation flash tank 2# filter 5. Hydrogenation flash tank 1# filter 4 is respectively installed with hydrogenation flash tank 1# filter front valve and hydrogenation flash tank 1# filter rear valve, hydrogenation flash tank 2# filter 5 is respectively installed with hydrogenation flash tank 2# filter front valve and hydrogenation flash tank 2# filter rear valve. The working condition of the filter is observed through the front and rear pressure gauges. If the filter is found to be blocked, it is switched in time, and the hydrogenation catalyst in the filter is collected to the catalyst recovery place. The two filters hydrogenation flash tank 1# filter 4 and hydrogenation flash tank 2# filter 5 are connected in parallel, one is open and the other is standby.
[0021] Finally, the reaction oil accumulates at the bottom of the hydrogenation flash tank 1 and is extracted from the middle of the hydrogenation flash tank 1. The liquid level of the hydrogenation flash tank 1 is maintained constant by cascade control of the liquid level meter 14, liquid flow meter 15 and the discharge valve 16 in the middle of the hydrogenation flash tank 1, and the pressure difference is used to transport the liquid to the refining separation tower.
[0022] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions for the specific implementation of the present invention rather than to limit it. Ordinary technicians in the relevant technical field should understand that any equivalent substitution or obvious modification of the implementation mode of the present invention without changing its performance or use, without violating the purpose of the present invention, should be included in the scope of protection requested by the present invention.
Claims
1. A hydrogenation catalyst filtration and recovery system, characterized in that: It includes a hydrogenation flash tank, a gas phase condenser and a liquid phase condenser. The hydrogenation flash tank is provided with a gas phase outlet, a liquid phase outlet and a condensate reflux port. The gas phase outlet is connected to the inlet of the gas phase condenser through a pipeline. The outlet of the gas phase condenser is connected to the fuel gas through a pipeline and a gas outlet valve on the top of the hydrogenation flash tank arranged on the pipeline. The liquid phase outlet is provided with two pipelines in parallel. The two pipelines are respectively provided with a hydrogenation flash tank 1# filter and a hydrogenation flash tank 2# filter so as to collect part of the hydrogenation catalyst and hydrogenation products and discharge them to the catalyst recovery place. The two pipelines are connected to the inlet of the liquid phase condenser, and the outlet of the liquid phase condenser is connected to the refining separation tower.
2. The hydrogenation catalyst filtration and recovery system according to claim 1, characterized in that: The gas phase condenser is provided with a gas phase outlet and an oil phase outlet. The gas phase outlet of the gas phase condenser is connected to the fuel gas through a pipeline and an outlet valve at the top of the hydrogenation flash tank arranged on the pipeline, and the oil phase outlet is connected to the condensate reflux port of the hydrogenation flash tank through a pipeline.
3. The hydrogenation catalyst filtration and recovery system according to claim 1, characterized in that: The hydrogenation flash tank is also provided with a pressure gauge and a liquid level gauge.
4. The hydrogenation catalyst filtration and recovery system according to claim 3, characterized in that: A gas phase flow meter is also provided on the pipeline between the gas phase condenser and the gas outlet valve at the top of the hydrogenation flash tank. The pressure gauge, the gas phase flow meter and the gas outlet valve at the top of the hydrogenation flash tank are cascade controlled, so that the size of the pressure gauge can be controlled by controlling the size of the gas phase flow meter through the gas outlet valve at the top of the hydrogenation flash tank.
5. The hydrogenation catalyst filtration and recovery system according to claim 3, characterized in that: A liquid phase flow meter and a middle discharge valve of the hydrogenation flash tank are provided on the pipeline between the liquid phase condenser and the refining separation tower. The liquid level meter, the liquid phase flow meter and the middle discharge valve of the hydrogenation flash tank are cascade controlled so that the size of the liquid phase flow meter is controlled by the middle discharge valve of the hydrogenation flash tank and then the size of the liquid level meter is controlled.
6. The hydrogenation catalyst filtration and recovery system according to claim 1, characterized in that: The inlet and outlet of the hydrogenation flash tank 1# filter and the inlet and outlet of the hydrogenation flash tank 2# filter are both equipped with valves and pressure gauges.