Micro-channel reaction calorimetric device

Abstract

The utility model relates to the technical field of chemical experiment equipment, and particularly discloses a micro-channel reaction calorimetric device which comprises a first material conveying pump, a second material conveying pump, a third material conveying pump, a first micro-channel reactor, a second micro-channel reactor and a receiving tank, discharging ports of the first material conveying pump and the second material conveying pump are communicated with a feeding port of the first micro-channel reactor through pipelines, and the third material conveying pump is communicated with a discharging port of the first micro-channel reactor and a feeding port of the second micro-channel reactor through pipelines. A flow meter and a temperature transmitter are arranged at a heat exchange medium inlet and a heat exchange medium outlet respectively, the flow and the temperature difference of a heat exchange medium can be calculated, and therefore the heat release speed of the microchannel reactors can be calculated according to a heat balance method calorimetric formula. The problem that a conventional micro-channel reactor cannot measure heat is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical experimental equipment, and specifically discloses a microchannel reaction calorimeter device. Background Art

[0002] Reaction calorimetry research is of extremely important significance in chemical production. Currently, the safety and environmental supervision faced by chemical production is becoming increasingly strict. The production processes of many products have changed from the original intermittent production method to a continuous production method. Due to the process change, the first process certification and evaluation are required. At present, almost all reaction calorimetry tests carried out by institutions are based on batch processes, and all calorimeter devices on the market are also designed based on batch operations. Although the enthalpy of a chemical reaction is related to the reaction itself and is not affected by batch or continuous operations, due to different conditions such as reaction concentration, temperature, and pressure, the risks brought by the reaction itself are different. In other words, the risk conditions that can be accommodated by different heat release and heat exchange methods will be different. It is not appropriate to directly apply the risk assessment of batch processes to continuous processes. Although industry insiders recognize that the risk of continuous processes is much lower than that of batch processes, there is no corresponding device that can directly provide calorimetry and evaluation data and cannot give quantitative data to illustrate the problem.

[0003] The microchannel reactor is the most common reactor form in continuous process solutions, with the characteristics of enhanced heat transfer and mass transfer, and is widely used in high-risk processes such as nitrification, oxidation, diazotization, chlorination, and fluorination.

[0004] Reaction calorimetry technology is to simulate the production process through a small device and infer and evaluate the risks in the production process by measuring heat data. For the same reaction, the risks shown in different reactors will also be different. For example: in a batch reaction, when the heat released is converted into the adiabatic temperature rise and exceeds the boiling point of the reaction solvent, the evaluation result may be that it causes short-term damage to the production workshop. However, for the same reaction in a closed pipeline, although the temperature will also exceed the boiling point of the solvent, it will not cause destructive consequences, but only increases the reaction pressure. For a microchannel reaction, only the back pressure needs to be increased. Therefore, it is not appropriate to directly evaluate a microchannel reaction using batch calorimetry data. However, almost all reaction calorimeter devices on the market are batch reactions, and no calorimeter device for microchannel reactors has been seen yet. Summary of the Utility Model

[0005] The utility model provides a microchannel reaction calorimeter device, which solves the problem that the previous microchannel reactor cannot be calorimetric.

[0006] The present utility model is implemented as follows. A microchannel reaction calorimeter device includes a first material delivery pump, a second material delivery pump, a third material delivery pump, a first microchannel reactor, a second microchannel reactor, and a receiving tank. The discharge ports of the first material delivery pump and the second material delivery pump and the feed port of the first microchannel reactor are connected through pipelines. The discharge port of the third material delivery pump, the discharge port of the first microchannel reactor, and the feed port of the second microchannel reactor are connected through pipelines. The discharge port of the second microchannel reactor is connected to the receiving tank through a pipeline.

[0007] For the convenience of heat exchange, as a preferred embodiment of the microchannel reaction calorimeter device of the present utility model, both the first microchannel reactor and the second microchannel reactor are provided with heat exchange jackets. The heat exchange jacket of the first microchannel reactor is respectively provided with a first heat exchange medium inlet and a first heat exchange medium outlet. The heat exchange jacket of the second microchannel reactor is respectively provided with a second heat exchange medium inlet and a second heat exchange medium outlet.

[0008] For the convenience of monitoring the temperatures at the inlet and outlet of the heat exchange jacket of the first microchannel reactor, as a preferred embodiment of the microchannel reaction calorimeter device of the present utility model, a first inlet temperature transmitter is provided at the first heat exchange medium inlet, and a first outlet temperature transmitter is provided at the first heat exchange medium outlet.

[0009] For the convenience of monitoring the temperatures at the inlet and outlet of the heat exchange jacket of the second microchannel reactor, as a preferred embodiment of the microchannel reaction calorimeter device of the present utility model, a second inlet temperature transmitter is provided at the second heat exchange medium inlet, and a second outlet temperature transmitter is provided at the second heat exchange medium outlet.

[0010] For the convenience of monitoring the flow rate at the inlet of the heat exchange jacket of the first microchannel reactor, as a preferred embodiment of the microchannel reaction calorimeter device of the present utility model, a first medium flowmeter is provided at the first heat exchange medium inlet.

[0011] For the convenience of monitoring the flow rate at the inlet of the heat exchange jacket of the second microchannel reactor, as a preferred embodiment of the microchannel reaction calorimeter device of the present utility model, a second medium flowmeter is provided at the second heat exchange medium inlet.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0013] In this microchannel reaction calorimeter device, by providing a flowmeter and an inlet temperature transmitter at the heat exchange medium inlet, the temperature and flow rate at the medium inlet can be monitored. By providing an outlet temperature transmitter at the heat exchange medium outlet, the temperature at the outlet can be monitored, thereby calculating the flow rate and temperature difference of the heat exchange medium. Thus, according to the calorimetry formula based on the heat balance method, the heat release rate of the microchannel reactor can be calculated, solving the problem that the prior microchannel reactor cannot perform calorimetry. Description of the Drawings

[0014] Figure 1 This is a schematic structural diagram of a microchannel reaction calorimeter of the present utility model.

[0015] In the figure, 1 is the first material delivery pump; 2 is the second material delivery pump; 3 is the third material delivery pump; 4 is the first microchannel reactor; 5 is the first heat exchange medium inlet; 6 is the first medium flowmeter; 7 is the first inlet temperature transmitter; 8 is the first heat exchange medium outlet; 9 is the first outlet temperature transmitter; 10 is the second microchannel reactor; 11 is the second heat exchange medium inlet; 12 is the second medium flowmeter; 13 is the second inlet temperature transmitter; 14 is the second heat exchange medium outlet; 15 is the second outlet temperature transmitter; 16 is the receiving tank. Detailed Embodiment

[0016] In order to make the objectives, technical solutions and advantages of the present utility model more clear and understandable, the present utility model will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0017] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, in the description of the present utility model, the meaning of "a plurality of" is two or more, unless otherwise specifically defined.

[0018] Please refer to Figure 1 , a microchannel reaction calorimeter, including a first material delivery pump 1, a second material delivery pump 2, a third material delivery pump 3, a first microchannel reactor 4, a second microchannel reactor 10 and a receiving tank 16. The discharge ports of the first material delivery pump 1 and the second material delivery pump 2 and the feed port of the first microchannel reactor 4 are connected through pipelines. The discharge port of the third material delivery pump 3 and the discharge port of the first microchannel reactor 4 and the feed port of the second microchannel reactor 10 are connected through pipelines. The discharge port of the second microchannel reactor 10 is connected to the receiving tank 16 through a pipeline.

[0019] In this embodiment: The device includes a plurality of material transfer pumps. Among them, the first material transfer pump 1 and the second material transfer pump 2 are connected to the first microchannel reactor 4. The material from the outlet of the first microchannel reactor 4 is mixed with the material of the third material transfer pump 3 and then enters the second microchannel reactor 10. After the reaction liquid leaves the second microchannel reactor 10, it enters the collection tank 16. Both the first microchannel reactor 4 and the second microchannel reactor 10 are designed with heat exchange jackets. A first medium flowmeter 6 and a second medium flowmeter 12 are respectively installed at the first heat exchange medium inlet 5 and the second heat exchange medium inlet 11 to measure the flow rate of the heat exchange medium. A first inlet temperature transmitter 7 and a second inlet temperature transmitter 13 are used to measure the inlet temperature of the heat exchange medium. A first outlet temperature transmitter 9 and a second outlet temperature transmitter 15 are respectively installed at the first heat exchange medium outlet 8 and the second heat exchange medium outlet 14 to measure the outlet temperature of the heat exchange medium.

[0020] When the continuous reaction is in a stable state, record the values of each sensor. Taking the first microchannel reactor 4 as an example, the flow rates of the transfer pumps are Fa and Fb, the room temperature is rt, the specific heat of the reaction medium is Cr, the specific gravity is ρr, the flow rate of the jacket is Fj, the inlet temperature is Tj1, the outlet temperature is Tj2, the specific heat of the heat exchange medium is Cj, and the specific gravity of the heat exchange medium is ρj. According to the calorimetry of the heat balance method:

[0021] Qr = ΔTj * F * C * ρ

[0022] (Qr is the heat of reaction, ΔTj is the temperature difference between the inlet and outlet of the jacket, F is the flow velocity of the heat exchange medium, C is the specific heat of the heat exchange medium, and ρ is the specific gravity of the heat exchange medium)

[0023] Tj2 - Tj1 = ΔTj, Tj1 - rt = ΔTr

[0024] Qr = Fj * Cj * ρj * ΔTj + (Fa + Fb) * Cr * ρr * ΔTr

[0025] Thus, the heat release rate of the first microchannel reactor can be calculated by heat balance, and the measurement and calculation methods for the second reactor are the same.

[0026] As a technical optimization solution of the present utility model, both the first microchannel reactor 4 and the second microchannel reactor 10 are provided with heat exchange jackets. The heat exchange jacket of the first microchannel reactor 4 is respectively provided with a first heat exchange medium inlet 5 and a first heat exchange medium outlet 8, and the heat exchange jacket of the second microchannel reactor 10 is respectively provided with a second heat exchange medium inlet 11 and a second heat exchange medium outlet 14.

[0027] In this embodiment: By respectively providing a first heat exchange medium inlet 5 and a first heat exchange medium outlet 8 in the heat exchange jacket of the first microchannel reactor 4, and respectively providing a second heat exchange medium inlet 11 and a second heat exchange medium outlet 14 in the heat exchange jacket of the second microchannel reactor 10, heat exchange is facilitated.

[0028] As a technical optimization scheme of the present utility model, a first inlet temperature transmitter 7 is provided at the first heat exchange medium inlet 5, and a first outlet temperature transmitter 9 is provided at the first heat exchange medium outlet 8.

[0029] In this embodiment: By providing a first inlet temperature transmitter 7 at the first heat exchange medium inlet 5 and a first outlet temperature transmitter 9 at the first heat exchange medium outlet 8, it is convenient to monitor the temperatures at the inlet and outlet of the heat exchange jacket of the first microchannel reactor 4.

[0030] As a technical optimization scheme of the present utility model, a second inlet temperature transmitter 13 is provided at the second heat exchange medium inlet 11, and a second outlet temperature transmitter 15 is provided at the second heat exchange medium outlet 14.

[0031] In this embodiment: By providing a second inlet temperature transmitter 13 at the second heat exchange medium inlet 11 and a second outlet temperature transmitter 15 at the second heat exchange medium outlet 14, it is convenient to monitor the temperatures at the inlet and outlet of the heat exchange jacket of the first microchannel reactor 10.

[0032] As a technical optimization scheme of the present utility model, a first medium flowmeter 6 is provided at the first heat exchange medium inlet 5.

[0033] In this embodiment: By providing a first medium flowmeter 6 at the first heat exchange medium inlet 5, it is convenient to monitor the flow rate at the inlet of the heat exchange jacket of the first microchannel reactor 4.

[0034] As a technical optimization scheme of the present utility model, a second medium flowmeter 12 is provided at the second heat exchange medium inlet 11.

[0035] In this embodiment: By providing a second medium flowmeter 12 at the second heat exchange medium inlet 11, it is convenient to monitor the flow rate at the outlet of the heat exchange jacket of the second microchannel reactor 10.

[0036] The working principle of the present utility model: When the continuous reaction is in a stable state, record the values of each sensor. Taking the first microchannel reactor 4 as an example, the flow rates of the feed pumps are Fa and Fb, the room temperature is rt, the specific heat of the reaction medium is Cr, the specific gravity is ρr, the jacket flow rate is Fj, the inlet temperature is Tj1, the outlet temperature is Tj2, the specific heat of the heat exchange medium is Cj, and the specific gravity of the heat exchange medium is ρj. According to the calorimetry of the heat balance method:

[0037] Qr = ΔTj * F * C * ρ

[0038] (Qr is the heat of reaction, ΔTj is the temperature difference between the inlet and outlet of the jacket, F is the flow rate of the heat exchange medium, C is the specific heat of the heat exchange medium, and ρ is the specific gravity of the heat exchange medium)

[0039] Tj2 - Tj1 = ΔTj, Tj1 - rt = ΔTr

[0040] Qr = Fj * Cj * ρj * ΔTj + (Fa + Fb) * Cr * ρr * ΔTr

[0041] Thus, the heat release rate of the first microchannel reactor can be calculated through heat balance, and the measurement and calculation methods of the second reactor are the same.

[0042] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A microchannel reaction calorimeter, characterized in that: The invention comprises a first material conveying pump (1), a second material conveying pump (2), a third material conveying pump (3), a first microchannel reactor (4), a second microchannel reactor (10) and a receiving tank (16); the discharge ports of the first material conveying pump (1) and the second material conveying pump (2) and the feed port of the first microchannel reactor (4) are connected via a pipeline; the discharge port of the third material conveying pump (3) and the first microchannel reactor (4) and the feed port of the second microchannel reactor (10) are connected via a pipeline; and the discharge port of the second microchannel reactor (10) and the receiving tank (16) are connected via a pipeline.

2. A microchannel reaction calorimeter according to claim 1, characterized in that: The first microchannel reactor (4) and the second microchannel reactor (10) are both provided with heat exchange jackets. The heat exchange jacket of the first microchannel reactor (4) is respectively provided with a first heat exchange medium inlet (5) and a first heat exchange medium outlet (8), and the heat exchange jacket of the second microchannel reactor (10) is respectively provided with a second heat exchange medium inlet (11) and a second heat exchange medium outlet (14).

3. A microchannel reaction calorimeter according to claim 2, characterized in that: The first heat exchange medium inlet (5) is provided with a first inlet temperature transmitter (7), and the first heat exchange medium outlet (8) is provided with a first outlet temperature transmitter (9).

4. A microchannel reaction calorimeter according to claim 2, characterized in that: The second heat exchange medium inlet (11) is provided with a second inlet temperature transmitter (13), and the second heat exchange medium outlet (14) is provided with a second outlet temperature transmitter (15).

5. A microchannel reaction calorimeter according to claim 2, characterized in that: The first heat exchange medium inlet (5) is provided with a first medium flow meter (6).

6. A microchannel reaction calorimeter according to claim 2, characterized in that: The second heat exchange medium inlet (11) is provided with a second medium flow meter (12).

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