Fixed bed activated carbon decoloration system
By using a fixed-bed activated carbon decolorization system, continuous decolorization and backwashing are carried out using the decolorizing agent in the tube heat exchanger, which solves the oxidation and recovery problems in the stirred decolorization process and achieves efficient and safe decolorization operation.
Patent Information
- Application Number
- CN202423317334.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2026-01-30
- Estimated Expiration
- 2034-12-31
AI Technical Summary
Existing batch stirring decolorization processes suffer from problems such as product oxidation, long operation time, difficulty in recovering decolorizing agents, cumbersome operation, and safety hazards, making it difficult to meet industrial needs.
A fixed-bed activated carbon decolorization system is adopted, including a reaction vessel, a storage vessel, and a fixed-bed decolorization device. The system utilizes the decolorizing agent in the tube heat exchanger for continuous decolorization, and the decolorizing agent is recovered and regenerated through a backwashing component.
It improves decolorization efficiency, enhances product quality and operational safety, reduces the frequency of activated carbon cleaning and operational difficulty, and achieves a simplified continuous decolorization process.
Smart Images
Figure CN223846287U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of decoloring process, in particular to a fixed bed activated carbon decoloring system. BACKGROUND
[0002] In the process of fine organic synthesis, colority is an important index of product. The method widely used in the current industrial decoloring process is generally a kettle type stirring decoloring process, that is, under certain conditions, the polyunsaturated fatty acid product is stirred and decolorized with a decoloring agent, after mixing for a proper time, the reaction liquid is filtered and recovered after decoloring, and the filter needs to be cleaned after filtration.
[0003] The industrial decoloring process has the following disadvantages: 1) the process is partially open operation, the raw material or intermediate is in contact with air or oxygen, resulting in product oxidation and quality decline; 2) the process is intermittent operation, the decoloring operation time is long, and the industrial design and large-scale production have certain difficulties; 3) the decoloring agent is difficult to recover and reuse, and the decoloring agent is difficult to handle; 4) the process operation is complicated; 5) a large amount of organic matter is adsorbed in the decoloring agent, and there is a great safety hazard in the cleaning operation process. UTILITY MODEL CONTENT
[0004] The utility model aims at providing a fixed bed activated carbon decoloring system to solve the problems existing in the prior art, improve the decoloring efficiency, product quality and operation safety, and reduce the cleaning frequency and operation difficulty of activated carbon.
[0005] To achieve the above-mentioned purpose, the utility model provides the following scheme:
[0006] The utility model provides a fixed bed activated carbon decoloring system, which comprises a reaction kettle, a liquid storage kettle and a fixed bed decoloring device, the reaction kettle contains a solution to be decolorized, the liquid storage kettle is used for containing the solution after decoloring, the fixed bed decoloring device is uniformly distributed with a decoloring agent unit, one end of the fixed bed decoloring device is communicated with the liquid outlet of the reaction kettle, the other end can be selected to be communicated with the liquid inlet of the reaction kettle or the liquid storage kettle, and a backwashing assembly is further arranged on the fixed bed decoloring device, and the solution to be decolorized and the backwashing solution can flow through the decoloring agent unit.
[0007] Preferably, the fixed bed decoloring device comprises a tube heat exchanger, a filter screen and a decoloring agent, the heat exchange tube of the tube heat exchanger is filled with the decoloring agent, the filter screen is arranged on the two ports of the heat exchange tube, the filter screen can prevent the decoloring agent from filtering out, and the shell side of the tube heat exchanger is communicated with a heat supply assembly.
[0008] Preferably, the heat exchange pipe is filled with 10-20 times of the reaction kettle single batch decoloring agent; the decoloring agent includes activated carbon, diatomite, white clay, silica gel or ion exchange resin.
[0009] Preferably, the heat supply assembly includes a water inlet pipe, a water outlet pipe and a flow regulating valve, the flow regulating valve is arranged on the water inlet pipe, the water inlet pipe is communicated with hot steam, and the water outlet pipe is communicated with a condensed water collecting device.
[0010] Preferably, a temperature sensor is arranged on the water outlet pipe of the tube heat exchanger, the temperature sensor is in communication connection with a control unit, the control unit is in communication connection with the flow regulating valve, and the temperature in the fixed bed decoloring device is set to 40-60 DEG C.
[0011] Preferably, flow regulating assemblies are arranged on the liquid inlet and the liquid outlet of the fixed bed decoloring device, the flow regulating assembly includes a flow meter and a flow regulating valve connected in series, the flow regulating valve is a pneumatic valve, the flow regulating valve is in communication connection with a control unit, and the flow speed of the flow regulating valve can make the to-be-decoloring solution flow in the fixed bed decoloring device for at least 10 min.
[0012] Preferably, the bottom of the reaction kettle and the bottom of the liquid storage kettle are both provided with the liquid discharge port, the pneumatic discharge valve is arranged on the liquid discharge port, and the pneumatic discharge valve is in communication connection with a control unit; the top cover of the reaction kettle and the top cover of the liquid storage kettle are both provided with the liquid inlet, and the ball valve is arranged on the liquid inlet and is in a normally open state during the decoloring process.
[0013] Preferably, a sampling port, a delivery pump and a pressure gauge are sequentially arranged on the pipeline communicated between the reaction kettle and the fixed bed decoloring device, and a ball valve is arranged on the sampling port.
[0014] Preferably, the bottom of the fixed bed decoloring device is connected with a colority detector, the colority detector is communicated with the reaction kettle and the liquid storage kettle through a branch, and pneumatic valves are arranged on the branch, and the pneumatic valves are in communication connection with a control unit.
[0015] Preferably, the backwashing assembly includes a backwashing pipe and a drain pipe, the bottom of the fixed bed decoloring device is communicated with the backwashing pipe, the top of the fixed bed decoloring device is communicated with the drain pipe, the backwashing pipe is communicated with a pressure water source, the drain pipe is communicated with a stripping column, and pneumatic valves are arranged on the backwashing pipe and the drain pipe, and the pneumatic valves are in communication connection with a control unit.
[0016] Compared with the prior art, the utility model discloses following technical effects have been achieved:
[0017] The system comprises a reaction kettle, a liquid storage kettle and a fixed bed decoloring device, the reaction kettle contains a solution to be decolored, the liquid storage kettle is used for containing the solution after decoloring, the fixed bed decoloring device is uniformly provided with a decoloring agent unit, one end of the fixed bed decoloring device is communicated with a liquid outlet of the reaction kettle, the other end of the fixed bed decoloring device can be selectively communicated with a liquid inlet of the reaction kettle or the liquid storage kettle, and a backwashing assembly is further arranged on the fixed bed decoloring device, and the solution to be decolored and a backwashing solution can flow through the decoloring agent unit. BRIEF DESCRIPTION OF DRAWINGS
[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort based on these drawings.
[0019] Figure 1 It is a structural schematic diagram of the fixed bed activated carbon decoloring system in the embodiments of the present application.
[0020] In the figure: 1-reaction kettle, 2-fixed bed decoloring device, 3-liquid storage kettle, 4-pneumatic discharge valve, 5-ball valve, 6-tube heat exchanger, 7-filter screen, 8-decoloring agent, 9-water inlet pipe, 10-water outlet pipe, 11-flow regulating valve, 12-temperature sensor, 13-flow meter, 14-sampling port, 15-conveying pump, 16-pressure gauge, 17-backwashing pipe, 18-drain pipe, 19-pneumatic valve, 20-COD online monitoring equipment. DETAILED DESCRIPTION
[0021] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative effort belong to the scope of protection of the present application.
[0022] The purpose of the present application is to provide a fixed bed activated carbon decoloring system to solve the problems in the prior art, improve the decoloring efficiency, product quality and operation safety, and reduce the cleaning frequency and operation difficulty of activated carbon.
[0023] In order to make the above purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.
[0024] Example 1
[0025] like Figure 1 As shown, this embodiment provides a fixed-bed activated carbon decolorization system, including a reaction vessel 1, a storage vessel 3, and a fixed-bed decolorization device 2. The reaction vessel 1 contains the solution to be decolorized, the storage vessel 3 contains the decolorized solution, and the fixed-bed decolorization device 2 contains decolorizing agent units evenly distributed inside. One end of the fixed-bed decolorization device 2 is connected to the drain port of the reaction vessel 1, and the other end can be selectively connected to the inlet of either the reaction vessel 1 or the storage vessel 3. The fixed-bed decolorization device 2 is also equipped with a backwashing component, so that both the solution to be decolorized and the backwashing solution can flow through the decolorizing agent units.
[0026] As an optional solution, the fixed bed decolorizing device 2 in this embodiment includes a tube heat exchanger 6, a filter screen 7, and a decolorizing agent 8. The heat exchange tubes of the tube heat exchanger 6 are filled with the decolorizing agent 8, and a filter screen 7 is provided at both ends of the heat exchange tubes. The filter screen 7 can prevent the decolorizing agent 8 from being filtered out. The shell side of the tube heat exchanger 6 is connected to a heating component.
[0027] As an optional solution, in this embodiment, the heat exchange tube is filled with 10-20 times the amount of decolorizing agent 8 used in a single batch of the reactor 1; the decolorizing agent 8 includes activated carbon, diatomaceous earth, kaolin, silica gel or ion exchange resin, and activated carbon is preferred in this embodiment.
[0028] As an optional solution, the heating component in this embodiment includes an inlet pipe 9, an outlet pipe 10, and a flow regulating valve 11. The inlet pipe 9 is equipped with a flow regulating valve 11 and is connected to hot steam. The outlet pipe 10 is connected to a condensate collection device.
[0029] As an optional solution, in this embodiment, a temperature sensor 12 is installed on the outlet pipe 10 of the tube heat exchanger 6. The temperature sensor 12 is connected to the control unit, and the control unit is connected to the flow regulating valve 11. The temperature in the fixed bed decolorizing device 2 is set to 40℃-60℃, and preferably 50℃-55℃ in this embodiment.
[0030] As an optional solution, the liquid inlet and outlet of the fixed bed decolorizing device 2 are provided with flow regulating components in the embodiment, the flow regulating components include a flow meter 13 and a flow regulating valve 11 connected in series, the flow regulating valve 11 is a pneumatic valve 19, the flow regulating valve 11 is in communication connection with the control unit, and the flow rate regulated by the flow regulating valve 11 can make the to-be-decolorized solution flow in the fixed bed decolorizing device 2 for at least 10 minutes. After the material in the reaction kettle 1 is reacted completely in the embodiment, the pneumatic discharge valve 4 at the bottom is opened, the material is transferred into the fixed bed activated carbon decolorizing device, the control unit controls the opening degree of the flow regulating valve 11 according to the parameter display of the flow meter 13, and the residence time of the material in the heat exchange pipe is ensured to be greater than or equal to 30 minutes; wherein the inlet and outlet ends of each device are preferentially provided with a ball valve 5, the ball valve 5 is always open during use, and when the regulating valve on each pipeline fails, the ball valve 5 on the port of each pipeline can be closed to terminate the process.
[0031] As an optional solution, the bottom of the reaction kettle 1 and the liquid storage kettle 3 is provided with a liquid discharge port, and the liquid discharge port is provided with a pneumatic discharge valve 4, the pneumatic discharge valve 4 is in communication connection with the control unit, so as to realize automatic control and reduce the participation of personnel. The top cover of the reaction kettle 1 and the liquid storage kettle 3 is provided with a liquid inlet, and the liquid inlet is provided with a ball valve 5, the ball valve 5 is in an always-open state during the decolorizing process.
[0032] As an optional solution, the pipeline connected between the reaction kettle 1 and the fixed bed decolorizing device 2 is sequentially provided with a sampling port 14, a conveying pump 15 and a pressure gauge 16, the sampling port 14 is provided with a ball valve 5, so as to facilitate sampling and detecting whether the reaction in the reaction kettle 1 is complete.
[0033] As an optional solution, the bottom of the fixed bed decolorizing device 2 is connected with a colorimetric detector, the colorimetric detector is in communication with the reaction kettle 1 and the liquid storage kettle 3 through a branch, and the branch is provided with a pneumatic valve 19, the pneumatic valve 19 is in communication connection with the control unit, so as to realize automatic control and reduce the participation of personnel. After the to-be-decolorized solution fills the heat exchange pipe in the embodiment, the pneumatic discharge valve 4 at the discharge port of the fixed bed activated carbon decolorizing device is opened, the transmittance detector detects that the material flows into the next process for treatment after passing the detection, and the material returns to the reaction kettle 1 to re-enter the decolorizing process if the detection is not qualified.
[0034] As an alternative, the backwashing assembly in the embodiment includes a backwashing pipe 17 and a drainage pipe 18, the bottom of the fixed bed decolorizing device 2 is communicated with the backwashing pipe 17, the top is communicated with the drainage pipe 18, the backwashing pipe 17 is communicated with a pressure water source, the drainage pipe 18 is communicated with the stripping column, the pneumatic valve 19 is arranged on the backwashing pipe 17 and the drainage pipe 18, the pneumatic valve 19 is in communication connection with the control unit, so as to realize automatic control and reduce the participation of personnel. In the embodiment, after the decolorization process is completed, the pneumatic valve 19 on the backwashing pipe 17 is opened, and the fixed bed decolorizing device 2 is backwashed by using process water or clean water. The chemical oxygen demand (COD) of the water to be washed is detected by using the COD online monitoring equipment 20. When the detection value is less than the set value, the washing is completed, and the activated carbon is replaced.
[0035] Embodiment two
[0036] In the embodiment, a fixed bed activated carbon decolorization process is provided. Based on the fixed bed activated carbon decolorization system in embodiment one, a certain amount of activated carbon powder is filled in the heat exchange pipe (the filling amount is much larger than the use amount of a single batch), and by controlling the flow rate of the solution to be decolorized in the heat exchange pipe, the one-time decolorization of the solution is realized. When the activated carbon is saturated, the residual solvent in the activated carbon is washed by water, and finally the activated carbon is replaced. The specific operation is as follows:
[0037] S1, first, the heat exchange pipe is filled with activated carbon, and the filling amount is 10-20 times of the activated carbon used for decolorization in a single batch;
[0038] S2, the solution to be decolorized is discharged into the fixed bed decolorizing device 2, and the discharge speed is controlled by the flow meter 13 and the flow regulating valve 11. The material flows into the pipe from the lower end.
[0039] S3, the shell side of the fixed bed decolorizing device 2 is communicated with a heat medium, so that the temperature of the solution in the decolorization process is maintained at 50-55°C, the decolorization efficiency is improved, and the precipitation of the material is prevented.
[0040] S4, the light transmittance detector is arranged at the discharge port of the fixed bed decolorizing device 2. When the light transmittance of the solution is qualified, the interlocking discharge valve enters the next process. When the detection is unqualified, the solution to be decolorized is circulated in the reaction kettle 1.
[0041] S5, when the activated carbon is saturated, pure water or process water is injected into the fixed bed activated carbon decolorizing device from the discharge port to wash the decolorizing agent 8 and remove the residual solvent in the activated carbon. The waste water after cleaning is sent to the stripping column for solvent separation, and the water is recycled.
[0042] The embodiment improves the decoloring efficiency, reduces the cleaning frequency of the activated carbon, and removes the residual organic solvent in the activated carbon through water washing of the activated carbon, thereby reducing the risk in the process of cleaning the activated carbon.
[0043] The principle and implementation mode of the utility model are described by applying specific examples in the utility model, and the above embodiment is only used for helping to understand the method and core idea of the utility model; meanwhile, according to the idea of the utility model, the specific implementation mode and application range will be changed by the general technical personnel in the field. In conclusion, the content of the specification should not be understood as the limitation of the utility model.
Claims
1. A fixed bed activated carbon decolorizing system characterized by: The fixed bed decoloring device is connected with a colority detector, the colority detector is communicated with the reaction kettle and the liquid storage kettle through a branch line respectively, and pneumatic valves are arranged on the branch line.
2. The fixed bed activated carbon decolorizing system according to claim 1, characterized in that: The fixed bed decoloring device includes a tube heat exchanger, a filter screen and a decoloring agent, the heat exchange tube of the tube heat exchanger is filled with the decoloring agent, the filter screen is arranged on the two ports of the heat exchange tube, and the filter screen can prevent the decoloring agent from filtering out.
3. The fixed bed activated carbon decolorizing system according to claim 2, characterized in that: The heat exchange tube is filled with 10-20 times of the decoloring agent required for a single batch of the reaction kettle, and the decoloring agent includes activated carbon, diatomite, white clay, silica gel or ion exchange resin.
4. The fixed bed activated carbon decolorizing system according to claim 2, characterized in that: The heat supply assembly includes a water inlet pipe, a water outlet pipe and a flow regulating valve, the flow regulating valve is arranged on the water inlet pipe, the water inlet pipe is communicated with hot steam, and the water outlet pipe is communicated with a condensed water collecting device.
5. The fixed bed activated carbon decolorizing system according to claim 4, characterized in that: A temperature sensor is arranged on the water outlet pipe of the tube heat exchanger, the temperature sensor is in communication connection with a control unit, the control unit is in communication connection with the flow regulating valve, and the temperature in the fixed bed decoloring device is set to 40-60 DEG C.
6. The fixed bed activated carbon decolorizing system according to claim 1, characterized in that: Flow regulating assemblies are arranged on the liquid inlet and the liquid outlet of the fixed bed decoloring device, the flow regulating assembly includes a flow meter and a flow regulating valve connected in series, the flow regulating valve is a pneumatic valve, the flow regulating valve is in communication connection with the control unit, and the flow rate of the flow regulating valve can make the decoloring solution flow in the fixed bed decoloring device for at least 10 minutes.
7. The fixed bed activated carbon decolorizing system according to claim 1, characterized in that: Pneumatic discharge valves are arranged on the liquid outlets of the reaction kettle and the liquid storage kettle, the pneumatic discharge valves are in communication connection with the control unit, ball valves are arranged on the liquid inlets of the top covers of the reaction kettle and the liquid storage kettle, and the ball valves are in a normal open state during the decoloring process.
8. The fixed bed activated carbon decolorizing system according to claim 1, characterized in that: A sampling port, a conveying pump and a pressure gauge are arranged on the pipeline, in sequence, through which the reaction kettle is communicated with the fixed bed decoloring device.
9. The fixed bed activated carbon decolorizing system according to claim 1, characterized in that: A colority detector is connected to the bottom of the fixed bed decoloring device, the colority detector is communicated with the reaction kettle and the liquid storage kettle through a branch line respectively, pneumatic valves are arranged on the branch line, and the pneumatic valves are in communication connection with the control unit.
10. The fixed bed activated carbon decolorizing system according to claim 1, characterized in that: The backwashing assembly includes a backwashing pipe and a drain pipe, the bottom of the fixed bed decoloring device is communicated with the backwashing pipe, and the top of the fixed bed decoloring device is communicated with the drain pipe, the backwashing pipe is communicated with a pressure water source, the drain pipe is communicated with a resolving tower, pneumatic valves are arranged on the backwashing pipe and the drain pipe, and the pneumatic valves are in communication connection with the control unit.