CSTR (continuous stirred-tank reactor) reaction calorimetric device
By designing a device that can independently measure and evaluate the heat of the CSTR reactor in a continuous process, the problem that the prior art cannot accurately evaluate the risk of continuous process reactions is solved, and detailed heat measurement and reaction risk assessment of each kettle body are realized, supporting safer and more economical chemical production.
Patent Information
- Application Number
- CN202421741288.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-23
- Publication Date
- 2025-05-06
- Estimated Expiration
- 2034-07-23
AI Technical Summary
The current reaction calorimetry test in chemical production is mainly based on batch processes and cannot be directly applicable to continuous processes, resulting in the inability to accurately evaluate the reaction risks and heat release conditions in continuous processes.
A CSTR reaction calorimetry device is designed, which can independently perform heat measurement and reaction risk assessment of each kettle body in a continuous operating state, and heat measurement and data recording are achieved through overflow pipe connections, heating rods, condenser tubes, thermometers and circulating water systems between multiple kettle bodies.
Independent heat measurement and reaction risk assessment of each kettle body are realized, clear reaction status and thermal enthalpy data are provided, process design, equipment design and safety risk assessment are supported, and production safety and economicality are improved.
Smart Images
Figure CN222837704U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of chemical experimental equipment, in particular to a CSTR reaction calorimetric device. Background Art
[0002] Reaction calorimetry research is extremely important in chemical production, mainly in the following aspects: 1. Safety assessment: It can help determine the potential risk of thermal runaway in the reaction process, so as to take corresponding measures to ensure production safety and avoid catastrophic accidents. 2. Process optimization: By accurately measuring the heat of reaction, it can provide key data for the optimization of process conditions, such as temperature control, feeding rate, etc., to improve reaction efficiency and selectivity. 3. Energy saving and consumption reduction: Understanding the thermal effect of the reaction helps to design a more reasonable energy utilization plan, reduce energy consumption, and improve the economy of production. 5. Equipment design: Provide a basis for the design of production equipment such as reactors to ensure that they can adapt to the heat load requirements of specific reactions. Before the new process production line is implemented in chemical production, a reaction risk assessment is required. The assessment process mainly studies the thermal behavior of materials and reactions. One of the important items is to measure and evaluate the reaction heat.
[0003] At present, the safety and environmental supervision faced by chemical production is becoming more and more stringent. The production process of many products has changed from the original intermittent production method to the continuous production method. Due to the change of process, the first process certification and evaluation are required. At present, the reaction calorimetry tests conducted by almost all institutions are based on batch processes, and all calorimetric devices on the market are also designed based on batch operations. Although the enthalpy of chemical reactions is related to the reaction itself and is not affected by batch or continuous operations, the risks brought by the reaction itself are different due to different reaction conditions such as concentration, temperature, and pressure. In other words, the risk conditions that can be accommodated by different heat release and heat exchange methods will be different. It is inappropriate to directly apply the risk assessment of batch processes to continuous processes. Although industry insiders all recognize that the risks of continuous processes are much lower than those of batch processes, there is no corresponding device to provide direct calorimetric and evaluation data, and no quantitative data can be provided to illustrate the problem.
[0004] CSTR (multi-stage kettle series) device is an important part of the continuous production process. CSTR technology has good versatility. Whether it is liquid, solid-liquid, or gas-liquid reaction state, it can be realized in CSTR. It can also realize multi-stage continuous water separation, dripping and other operations. CSTR is the most economical method to solve the reaction type with slow speed. Due to the large liquid holding capacity and low equipment investment, CSTR has advantages that other methods do not have. However, precisely because CSTR has a large liquid holding capacity, compared with microchannel and tubular reactors, it has the greatest risk in continuous reaction devices. It is very important for new production devices to fully study the reaction process and calorimetry of each kettle in CSTR. Utility Model Content
[0005] The utility model aims to provide a CSTR reaction calorimetric device, which has the characteristics of being able to independently measure the heat of each kettle in a continuous operation state and independently evaluate the reaction risk of each kettle.
[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a CSTR reaction calorimetric device, comprising a plurality of kettle bodies, wherein the plurality of kettle bodies are connected to each other through an overflow pipe, a heating rod is arranged inside the kettle body, a condenser is arranged on one side of the upper end surface of the kettle body, a thermometer extending to the inside of the kettle body is fixedly connected to the top of the kettle body, a circulating water inlet is arranged above one side of the outer wall of the kettle body, a circulating water return is arranged below the other side of the outer wall of the kettle body, a water inlet thermometer and a return water thermometer are respectively arranged on the outer walls of the circulating water inlet and the circulating water return, and a condenser inlet thermometer and a condenser outlet thermometer are respectively arranged at the inlet and outlet of the condenser.
[0007] In order to facilitate the introduction of raw materials into the kettle body, as a preferred CSTR reaction calorimetric device of the utility model, the top of the kettle body is provided with an A-path feed port and a B-path feed port, and the outer walls of the A-path feed port and the B-path feed port are respectively connected to the A-path delivery pump and the B-path delivery pump through delivery pipelines.
[0008] In order to facilitate the discharge of raw materials, as a preferred CSTR reaction calorimetric device of the utility model, a discharge port is arranged above the outer side wall of the kettle body.
[0009] In order to facilitate the discharge of residual materials in the kettle body, as a preferred CSTR reaction calorimetric device of the utility model, a drain pipe is arranged at the bottom of the kettle body.
[0010] Compared with the prior art, the beneficial effects of the utility model are as follows:
[0011] This device can independently measure the heat of each kettle under continuous operation and independently evaluate the reaction risk of each kettle. Several similar systems work simultaneously to complete a set of CSTR heat measurement. According to the measurement results, the reaction state and thermal enthalpy data of each kettle can be clearly obtained, which provides an important basis in process design, equipment design and safety risk assessment. The PLC system is used to measure and record the data, and automatic calculation can be achieved through computer software. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 This is the overall structure diagram of the utility model;
[0013] In the figure: 1. A-line delivery pump; 2. B-line delivery pump; 3. A-line feed port; 4. B-line feed port; 5. Heating rod; 6. Condenser; 7. Thermometer; 8. Discharge port; 9. Circulating water return port; 10. Circulating water inlet; 11. Return water thermometer; 12. Inlet water thermometer; 13. Drain pipe; 14. Condenser outlet thermometer; 15. Condenser inlet thermometer. DETAILED DESCRIPTION
[0014] See also Figure 1 A CSTR reaction calorimetric device comprises a plurality of kettle bodies, which are connected by overflow pipes, a heating rod 5 is arranged inside the kettle body, a condenser 6 is arranged on one side of the upper end surface of the kettle body, a thermometer 7 extending to the inside of the kettle body is fixedly connected to the top of the kettle body, a circulating water inlet 10 is arranged above one side of the outer wall of the kettle body, a circulating water return port 9 is arranged below the other side of the outer wall of the kettle body, an inlet water thermometer 12 and a return water thermometer 11 are respectively arranged on the outer walls of the circulating water inlet 10 and the circulating water return port 9, and a condenser inlet thermometer 15 and a condenser outlet thermometer 14 are respectively arranged at the inlet and outlet of the condenser 6.
[0015] In this embodiment: the CSTR reaction calorimetric device includes multiple kettles and calorimetric systems. The kettles are connected by overflow pipes. Each system can be measured independently. A circulating water return port 9 is provided on the outer wall of the kettle, and a return water thermometer 11 is installed to measure the inlet temperature Tj1 of the heat exchange medium. A circulating water inlet 10 is provided on the upper side of the outer wall of the kettle, and a water inlet thermometer 12 is provided to measure the outlet temperature Tj2 of the heat exchange medium.
[0016] Tj2-Tj1=ΔTj
[0017] (Tj2+Tj1) / 2=Tj
[0018] The jacket circulation system is designed as a hot and cold integrated constant flow rate circulation, the flow rate is F, and the specific heat capacity of the heat exchange medium is C.
[0019] The heat exchanged by the jacket constant temperature circulation system can be calculated by the following formula:
[0020] Qr=ΔTj*F*C*ρ
[0021] From this, the rate at which the reactor releases heat can be calculated through heat balance.
[0022] The heat flow calibration system includes a heating rod 5 inserted into the kettle and a variable power measuring device, which can directly read the voltage V and current I applied to the heating rod 5. The power generated by the heating rod is
[0023] W=V*I
[0024] The determined power input plays a decisive role in the determination of the heat flux coefficient U. When the heating rod 5 releases heat at a constant power, the temperature of the calibration system rises, and the constant temperature system performs jacket heat exchange at a constant flow rate, so that a temperature difference is formed inside and outside the kettle. When the temperature difference between the inside and outside reaches stability, all the heat released by the heating rod 5 is removed through the jacket, that is, the heat exchange power of the jacket is equal to the input power, according to the following formula:
[0025] Qr=UA(Tr-Tj)
[0026] A is the heat exchange area, Qr is the heat exchange power, which is equal to the input power, and Tr is the temperature in the kettle, which can be calculated
[0027] UA=(Tr-Tj) / Qr
[0028] With this coefficient, we can carry out heat flow calorimetric testing. By recording the temperature inside the chamber Tr and the average temperature of the jacket Tj during the reaction process, we can calculate the heat release rate in real time.
[0029] Several identical systems work simultaneously to complete a set of CSTR heat measurements. Based on the measurement results, the reaction status and thermal enthalpy data of each kettle can be clearly obtained, providing important basis for process design, equipment design and safety risk assessment.
[0030] The PLC system is used to measure and record data, and automatic calculations can be achieved through computer software.
[0031] As a technical optimization solution of the utility model, a feed port A 3 and a feed port B 4 are arranged on the top of the kettle body, and the outer walls of the feed port A 3 and the feed port B 4 are connected to the feed pump A 1 and the feed pump B 2 through the delivery pipelines respectively.
[0032] In this embodiment, the outer walls of the A-way feed port 3 and the B-way feed port 4 are respectively connected to the A-way feed pump 1 and the B-way feed pump 2 through the feed pipelines, so as to facilitate the introduction of the raw materials into the kettle body.
[0033] As a technical optimization solution of the present invention, a discharge port 8 is provided above the outer side wall of the kettle body.
[0034] In this embodiment: a discharge port 8 is arranged above the outer side wall of the kettle body, so as to facilitate the discharge of raw materials through the discharge port 8.
[0035] As a technical optimization solution of the utility model, a drain pipe 13 is provided at the bottom of the kettle body.
[0036] In this embodiment, a drain pipe 13 is provided at the bottom of the kettle body to facilitate the discharge of residual materials inside the kettle body.
[0037] Working principle: The CSTR reaction calorimetric device includes multiple kettles and calorimetric systems. The kettles are connected by overflow pipes. Each system can be measured independently. A circulating water return port 9 is set on the outer wall of the kettle, and a return water thermometer 11 is installed to measure the inlet temperature Tj1 of the heat exchange medium. A circulating water inlet 10 is set on the upper side of the outer wall of the kettle, and an inlet water thermometer 12 is set to measure the outlet temperature Tj2 of the heat exchange medium.
[0038] Tj2-Tj1=ΔTj
[0039] (Tj2+Tj1) / 2=Tj
[0040] The jacket circulation system is designed as a hot and cold integrated constant flow rate circulation, the flow rate is F, and the specific heat capacity of the heat exchange medium is C.
[0041] The heat exchanged by the jacket constant temperature circulation system can be calculated by the following formula:
[0042] Qr=ΔTj*F*C*ρ
[0043] From this, the rate at which the reactor releases heat can be calculated through heat balance.
[0044] The heat flow calibration system includes a heating rod 5 inserted into the kettle and a variable power measuring device, which can directly read the voltage V and current I applied to the heating rod 5. The power generated by the heating rod is
[0045] W=V*I
[0046] The determined power input plays a decisive role in the determination of the heat flux coefficient U. When the heating rod 5 releases heat at a constant power, the temperature of the calibration system rises, and the constant temperature system performs jacket heat exchange at a constant flow rate, so that a temperature difference is formed inside and outside the kettle. When the temperature difference between the inside and outside reaches stability, all the heat released by the heating rod 5 is removed through the jacket, that is, the heat exchange power of the jacket is equal to the input power, according to the following formula:
[0047] Qr=UA(Tr-Tj)
[0048] A is the heat exchange area, Qr is the heat exchange power, which is equal to the input power, and Tr is the temperature in the kettle, which can be calculated
[0049] UA=(Tr-Tj) / Qr
[0050] With this coefficient, we can carry out heat flow calorimetric testing. By recording the temperature inside the chamber Tr and the average temperature of the jacket Tj during the reaction process, we can calculate the heat release rate in real time.
[0051] Several identical systems work simultaneously to complete a set of CSTR heat measurements. Based on the measurement results, the reaction status and thermal enthalpy data of each reactor can be clearly obtained.
[0052] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A CSTR reaction calorimetric device, comprising a plurality of kettles, wherein the plurality of kettles are connected by overflow pipes, characterized in that: A heating rod (5) is arranged inside the kettle body, a condenser (6) is arranged on one side of the upper end surface of the kettle body, a thermometer (7) extending into the kettle body is fixedly connected to the top of the kettle body, a circulating water inlet (10) is arranged above one side of the outer wall of the kettle body, a circulating water return port (9) is arranged below the other side of the outer wall of the kettle body, an inlet water thermometer (12) and a return water thermometer (11) are respectively arranged on the outer walls of the circulating water inlet (10) and the circulating water return port (9), and a condenser inlet thermometer (15) and a condenser outlet thermometer (14) are respectively arranged at the inlet and outlet of the condenser (6).
2. A CSTR reaction calorimeter according to claim 1, characterized in that: The top of the kettle body is provided with an A-way feed port (3) and a B-way feed port (4), and the outer walls of the A-way feed port (3) and the B-way feed port (4) are connected to an A-way delivery pump (1) and a B-way delivery pump (2) respectively through delivery pipelines.
3. A CSTR reaction calorimeter according to claim 1, characterized in that: A discharge port (8) is arranged above the outer side wall of the kettle body.
4. A CSTR reaction calorimeter according to claim 1, characterized in that: A drain pipe (13) is arranged at the bottom of the kettle body.