Continuous reaction equipment

Abstract

The utility model provides continuous reaction equipment. The reaction equipment comprises a first reaction kettle, a second reaction kettle, a liquid distributor, a static mixer, an external circulation heat exchanger, an external circulation pipeline and an external conveying pipeline, the first reaction kettle comprises a first feed port and a first discharge port, the second reaction kettle comprises a second feed port and a second discharge port, and the first discharge port is connected with the second feed port through an external conveying pipeline; the outer circulation pipeline is connected with an outer circulation outlet in the bottom of the first reaction kettle and an outer circulation inlet in the top of the first reaction kettle, the outer circulation heat exchanger is connected with the outer circulation pipeline, and the liquid distributor and the static mixer are arranged in the outer circulation heat exchanger; the liquid distributor is located on the lower portion in the outer circulation heat exchanger, and the static mixer is located above the liquid distributor.

Description

Technical Field

[0001] The present application relates to the field of chemical equipment, and more specifically provides a continuous reaction equipment for synthesizing polymers in a continuous manner. Background Art

[0002] Polymer polyols are a class of industrial raw materials with a wide range of uses and large consumption. For example, polymer polyols such as polyether polyols and polyester polyols often form a dispersed system in the form of polymer particles that are independent of each other and do not contact each other. They are used as raw materials to prepare polyurethane products such as polyurethane foams and polyurethane elastomers. These polymer polyol raw materials can effectively improve the various properties of polyurethane products. Therefore, the demand for these polymer polyols in the industry is constantly increasing.

[0003] At present, polymer polyols are mainly produced through batch and continuous processes. When using the batch process to prepare polymer polyols in production, the stability of products from different production batches varies greatly, and the formula needs to be adjusted to adapt to the corresponding production and application. In addition, the viscosity of polymer polyols produced by the batch process is relatively high, which is contrary to the current demand for low viscosity of polymer polyols. This is one of the problems that the batch process needs to solve urgently.

[0004] In contrast, the continuous preparation process of polymer polyols is suitable for large-scale production, and the output products are stable. At the same solid content, the polymer polyol products prepared by the continuous method have lower viscosity than those prepared by the intermittent method, but the continuous method also has the problem of relatively low monomer conversion rate. Another important issue is that in the continuous production process of polymer polyols, the mixed reaction materials need to be added to the reactor and reacted at a certain reaction temperature and pressure. Moreover, the reaction is an exothermic reaction. In order to ensure that the heat is removed from the reactor in time, the reactor needs to be strictly temperature controlled. However, the heat exchange capacity of the reactor of polymer polyols is currently insufficient, and the heat exchange efficiency of the circulating heat exchangers in most existing reactors is also insufficient, which makes it difficult to meet the heat exchange requirements of the reaction system. Utility Model Content

[0005] In order to solve the above problems, the inventors of the present application have developed a reaction equipment which is suitable for preparing polymers such as polymer polyols by conducting polymerization reactions in a continuous manner, and achieves efficient heat transfer during the reaction process to prevent adverse phenomena such as local overheating and agglomeration in the reaction equipment.

[0006] Specifically, the present application provides a continuous reaction device, characterized in that the reaction device includes a first reaction kettle, a second reaction kettle, a liquid distributor, a static mixer, an external circulation heat exchanger, an external circulation pipeline and an external transport pipeline;

[0007] The first reactor comprises a first feed port and a first discharge port, the second reactor comprises a second feed port and a second discharge port, and the first discharge port is connected to the second feed port through an external delivery pipeline;

[0008] The external circulation pipeline is connected to the external circulation outlet at the bottom of the first reactor and the external circulation inlet at the top of the first reactor.

[0009] According to one embodiment of the present application, the external circulation heat exchanger is connected to the external circulation pipeline, the liquid distributor and the static mixer are arranged inside the external circulation heat exchanger, the liquid distributor is located in the lower part of the external circulation heat exchanger, and the static mixer is located above the liquid distributor.

[0010] According to another embodiment of the present application, the liquid distributor is arranged inside the external circulation heat exchanger and the feed port of the liquid distributor is connected to the feed port of the liquid distributor; the feed port of the static mixer is connected to the discharge port of the liquid distributor; the discharge port of the static mixer is connected to the discharge port of the external circulation heat exchanger.

[0011] According to another embodiment of the present application, the first feed port of the first reactor is connected to a feed pipeline, and the second discharge port of the second reactor is connected to a discharge pipeline.

[0012] According to another embodiment of the present application, an external circulation pump is connected to the external circulation pipeline.

[0013] According to another embodiment of the present application, the external circulation pump is arranged between the external circulation outlet and the external circulation heat exchanger, or between the external circulation heat exchanger and the external circulation inlet, or a combination of the above situations.

[0014] According to another embodiment of the present application, the aspect ratio of the external circulation heat exchanger is 5:1 to 12:1.

[0015] According to another embodiment of the present application, a stirring device is respectively provided in the first reaction kettle and the second reaction kettle.

[0016] According to another embodiment of the present application, the continuous reaction equipment also includes a second external circulation pipeline and a second external circulation heat exchanger, the second external circulation heat exchanger is connected to the second external circulation pipeline, the second liquid distributor and the second static mixer are arranged inside the second external circulation heat exchanger, the second liquid distributor is located in the lower part of the second external circulation heat exchanger, the second static mixer is located above the second liquid distributor, and the second external circulation pipeline is connected to the second external circulation outlet and the second external circulation inlet at the bottom of the second reactor.

[0017] According to another embodiment of the present application, the continuous reaction device is a reaction device used to carry out polymerization reaction in a continuous manner to prepare polymer polyol.

[0018] In the following specific implementation section, the technical solution of the present application is described in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of a continuous reaction device according to one embodiment of the present application is shown, wherein each reactor is provided with an external circulation device;

[0020] Figure 2 A schematic diagram of a continuous reaction device according to another embodiment of the present application is shown, wherein both reactors are provided with an external circulation device;

[0021] Figure 3 A scanning electron micrograph (SEM) of a polymer polyol product prepared in an example of the present application is shown;

[0022] Figure 4 The particle size distribution characterization diagram of the polymer polyol prepared in the examples of the present application was implemented.

[0023] The reference numerals used in the drawings have the following meanings:

[0024] 1 feed pipeline; 2 first feed port; 3 first reactor; 4 external circulation pipeline; 5 external circulation pump; 6 liquid distributor; 7 static mixer; 8 external circulation heat exchanger; 9 first discharge port; 10 external delivery pipeline; 11 second reactor; 12 discharge pipeline; 13 second feed port; 14 second discharge port; A external circulation outlet; B external circulation inlet; C second external circulation outlet; D second external circulation inlet. DETAILED DESCRIPTION

[0025] "Range" disclosed herein is in the form of lower limit and upper limit. It can be one or more lower limits, and one or more upper limits respectively. A given range is defined by selecting a lower limit and an upper limit. The selected lower limit and upper limit define the boundaries of a particular range. All ranges that can be defined in this way are inclusive and combinable, i.e. any lower limit can be combined with any upper limit to form a range. For example, a range of 60-120 and 80-110 is listed for a particular parameter, and it is understood that a range of 60-110 and 80-120 is also expected. In addition, if the minimum range values ​​1 and 2 are listed, and if the maximum range values ​​3, 4 and 5 are listed, the following ranges can all be expected: 1-3, 1-4, 1-5, 2-3, 2-4 and 2-5.

[0026] In this application, unless otherwise specified, the numerical range "ab" represents an abbreviation of any real number combination between a and b, where a and b are real numbers. For example, the numerical range "0-5" means that all real numbers between "0-5" are listed in this document, and "0-5" is just an abbreviation of these numerical combinations.

[0027] In this application, unless otherwise specified, all embodiments and preferred embodiments mentioned herein can be combined with each other to form a new technical solution.

[0028] In this application, unless otherwise specified, all technical features and preferred features mentioned herein can be combined with each other to form a new technical solution.

[0029] In the present application, unless otherwise specified, all steps mentioned herein may be performed sequentially or randomly, but are preferably performed sequentially. For example, the method includes steps (a) and (b), which means that the method may include steps (a) and (b) performed sequentially, or may include steps (b) and (a) performed sequentially. For example, the method may further include step (c), which means that step (c) may be added to the method in any order, for example, the method may include steps (a), (b) and (c), or may include steps (a), (c) and (b), or may include steps (c), (a) and (b), etc.

[0030] In this application, if there is no special explanation, the "including" mentioned herein means open or closed. For example, the "including" may mean that other components not listed may also be included, or only the listed components may be included.

[0031] In the present application, when describing the spatial relationship of a specific component or object relative to other components or objects, the terms "inside", "outside", "above", "below", etc. are used to indicate that the former is located inside, outside, above or below the latter, and the two may be in direct contact, or may be separated by a certain distance or separated by a third component or object.

[0032] It should be emphasized that what is shown in the drawings and described below are only some specific embodiments of the present application, and the protection scope of the present application is not limited to these specific embodiments. The protection scope of the present application is defined by the claims of the present application, and may include any technical solution within the scope of the claims, including but not limited to further improvements and substitutions to these specific embodiments.

[0033] The present application mainly protects the shape, structure and combination of a reaction device. The reaction raw materials, additives, polymerization product materials, polymerization reactions and process parameters (such as temperature and pressure, etc.) mentioned in the present application are all common knowledge in the art and are not the invention of the present application.

[0034] Figure 1 A continuous reaction device according to one embodiment of the present application is shown, which includes a first reactor 3, a second reactor 11, and an external circulation device matched with the first reactor, wherein the external circulation device includes an external circulation pipeline 4 and an external circulation heat exchanger 8 connected to the external circulation pipeline 4.

[0035] According to one embodiment of the present application, the first reactor 3 includes a first feed port 2 and a first discharge port 9, and the vertical height of the first feed port 2 is lower than the vertical height of the first discharge port 9. For example, the first feed port 2 is arranged at a position close to the bottom of the side wall of the first reactor 3, and the first discharge port 9 is arranged at a position close to the top of the side wall of the first reactor 3.

[0036] The second reactor 11 includes a second feed port 13 and a second discharge port 14, and the vertical height of the second feed port 13 is lower than the vertical height of the second discharge port 14. For example, the second feed port 13 is arranged at a position close to the bottom of the side wall of the second reactor 11, and the second discharge port 14 is arranged at a position close to the top of the side wall of the second reactor 11.

[0037] The feed pipeline 1 is connected to the first feed port 2 of the first reactor 3 , and the first discharge port 9 is connected to the second feed port 13 of the second reactor through an external delivery pipeline 10 .

[0038] The second discharge port 14 of the second reaction kettle 11 is connected to the discharge pipeline 12 .

[0039] The feed pipeline 1, the external delivery pipeline 10 and the discharge pipeline 12 may be provided with one or more devices or elements selected from the following: a switch valve, a three-way valve, a bypass device, a pressure sensor, a temperature sensor, a stirring device, a heat exchanger, etc.

[0040] The first reactor 3 and the second reactor 11 can be provided with stirring devices respectively as needed, and other devices, elements or structures, such as baffles, drainage devices, etc., can be provided as needed to stir the reaction materials in the reactors during the reaction process, strengthen or weaken the overall or local flow, etc.

[0041] According to a specific embodiment of the present application, the first reactor 3 is equipped with an external circulation system, specifically including an external circulation pipeline 4 and an external circulation heat exchanger 8 connected to the external circulation pipeline 4. An external circulation outlet A is provided at the bottom of the first reactor 3, and an external circulation inlet B is provided at the top. The external circulation outlet A and the external circulation inlet B are respectively connected to the external circulation pipeline 4. During the continuous polymerization reaction, a portion of the material in the reactor 3 will flow out from the external circulation outlet A, flow through the external circulation heat exchanger 8 through the external circulation pipeline 4, and return to the first reactor 3 through the external circulation inlet B.

[0042] According to one embodiment of the present application, the external circulation pipeline 4 is also connected to at least one external circulation pump 5, which can be located between the external circulation outlet A and the external circulation heat exchanger 8, or between the external circulation heat exchanger 8 and the external circulation inlet B, or an external circulation pump 5 is respectively provided between the external circulation outlet A and the external circulation heat exchanger 8 and between the external circulation heat exchanger 8 and the external circulation inlet B.

[0043] According to one embodiment of the present application, a liquid distributor 6 and a static mixer 7 are provided inside the external circulation heat exchanger 8. The liquid distributor 6 is provided at the lower part of the external circulation heat exchanger 8, and the static mixer 7 is provided above the liquid distributor 6 in the external circulation heat exchanger 8.

[0044] According to one embodiment of the present application, the external circulation heat exchanger can have a cylindrical (cylindrical) shape, for example, its aspect ratio can be 5:1 to 12:1, for example, 6:1 to 10:1, or 7:1 to 8:1, or between any two of the above end values.

[0045] According to one embodiment of the present application, the liquid distributor 6 may be in the form of a plurality of parallelly arranged tubes, a porous plate, or a plurality of tubes passing through a baffle. After the material circulating in the external circulation pipeline 4 flows upward through the liquid distributor 6, the fluid is evenly distributed, and then flows upward into the static mixer 7.

[0046] According to one embodiment of the present application, the static mixer 7 may include a component having a non-linear shape to change the flow direction and flow path of the fluid therein, thereby achieving mixing of the fluid therein. For example, the static mixer 7 may include a baffle, a serpentine pipe, a spiral pipe, and other structural designs.

[0047] In addition to the liquid distributor 6 and the static mixer 7, the external circulation heat exchanger 8 is also provided with a cooling water device (such as a cooling water channel or a cooling water jacket), for example Figure 1The cooling water inlet and the cooling water outlet are drawn in the figure, so that the cooling water in the heat exchanger 8 (for example, flowing through the cooling water channel or the cooling water jacket) is separated from the circulating reaction materials by a wall, and heat transfer occurs between the cooling water and the circulating reaction materials through the wall, so as to realize effective heat recovery and temperature control of the circulating reaction materials.

[0048] According to another embodiment of the present application, Figure 2 As shown, both the first reactor and the second reactor may be provided with an external circulation system. Figure 2 In the embodiment shown, other devices and components are the same as Figure 1 The second reactor 11 is the same as the first reactor 11, and the only difference is that the second reactor 11 is also equipped with an external circulation system, specifically, the external circulation system includes an external circulation pipeline 15 and an external circulation heat exchanger 16 connected to the external circulation pipeline. A second external circulation outlet C is provided at the bottom of the second reactor 11, and a second external circulation inlet D is provided at the top. The second external circulation outlet C and the second external circulation inlet D are respectively connected to the second external circulation pipeline 15. During the continuous polymerization reaction, a part of the material in the second reactor 11 will flow out from the second external circulation outlet C, flow through the external circulation heat exchanger 16 through the second external circulation pipeline 15, and return to the second reactor 11 through the second external circulation inlet D.

[0049] According to one embodiment of the present application, the second external circulation pipeline 15 is also connected to at least one second external circulation pump 19, which can be located between the second external circulation outlet C and the second external circulation heat exchanger 16, or between the second external circulation heat exchanger 16 and the second external circulation inlet D, or a second external circulation pump 19 is respectively provided between the second external circulation outlet C and the second external circulation heat exchanger 16 and between the second external circulation heat exchanger 16 and the second external circulation inlet D.

[0050] According to one embodiment of the present application, a second liquid distributor 17 and a static mixer 18 are provided inside the second external circulation heat exchanger 16. The liquid distributor 17 is provided at the lower part inside the external circulation heat exchanger 16, and the static mixer 18 is provided above the liquid distributor 17 inside the external circulation heat exchanger 16. The structures of the second liquid distributor 17 and the second static mixer 18 may be the same as those of the liquid distributor 6 and the static mixer 7 described above, respectively.

[0051] In addition to the second liquid distributor 17 and the second static mixer 18, the second external circulation heat exchanger 16 is also provided with a cooling water device (such as a cooling water circulation pipeline or a cooling water jacket), for example Figure 2A cooling water inlet and a cooling water outlet are drawn in the figure, so that the cooling water in the heat exchanger 16 (for example, flowing in a cooling water circulation pipe or a cooling water jacket) is separated from the circulating reaction materials by a wall, and heat transfer occurs between the cooling water and the circulating materials through the wall, so as to realize effective heat recovery and temperature control of the circulating reaction materials.

[0052] According to an exemplary embodiment of the present application, Figure 1 As shown, the reaction equipment described in the utility model can be used for continuous polymerization reaction, for example, polymer polyols, such as polyether polyols or polyester polyols, can be produced by continuous polymerization. In the process of polymerization reaction, the raw materials are mixed and transported into the first reactor through the feed line 1 and the first feed port 2 together with optional additives (such as catalysts, solvents, cosolvents, diluents, promoters, branching agents, chain extenders, molecular weight regulators, emulsifiers, dispersants, etc.), and polymerization reaction occurs at a specific temperature and pressure, and then flows out from the first discharge port 9 of the first reactor 3. It is transported through the second feed port 13 through the external transport line 10 and enters the second reactor 11, and polymerization reaction further occurs in the second reactor, and finally discharged from the discharge line 12 through the second discharge port 14.

[0053] The reaction is carried out in a continuous manner, and the polymerization product is continuously discharged from the discharge pipeline 12, while the raw material mixture is continuously introduced from the feed pipeline 1. The stirring devices in the reactor 3 and the reactor 11 continuously stir, so that the materials in the reactor are evenly distributed and contacted more fully.

[0054] In addition, Figure 1 In the illustrated embodiment, during the above-mentioned continuous reaction process, a portion of the material is continuously discharged through the external circulation outlet A at the bottom of the reactor 3, flows through the external circulation pipeline under the action of the external circulation pump 5, and flows through the liquid distributor 6 and the static mixer 7 in sequence when passing through the external circulation heat exchanger 8. During the flow, the fluid is evenly distributed, and heat is exchanged with the cooling water under the action of the external circulation heat exchanger 8, taking away the heat contained in the reaction material, and then flows into the first reactor 3 through the external circulation inlet B at the top of the first reactor 3.

[0055] According to another embodiment of the present application, the polymerization reaction is Figure 2 The method shown above is carried out, in which in addition to the above Figure 1In addition to the design shown, it also includes an external circulation system for the second reactor 11. During the above continuous reaction, not only the reaction materials in the reactor 3 are externally circulated, but also the reaction materials in the reactor 11 are externally circulated. Specifically, a portion of the material is continuously discharged through the second external circulation outlet C at the bottom of the reactor 11, flows through the external circulation pipeline 15 under the action of the second external circulation pump 19, and flows through the second liquid distributor 17 and the static mixer 18 in sequence when passing through the second external circulation heat exchanger 16. During the flow, the fluid is evenly distributed, and heat is exchanged with the cooling water under the action of the second external circulation heat exchanger 16, taking away the heat contained in the reaction flow, and then flows into the second reactor 11 through the external circulation inlet D at the top of the second reactor 11.

[0056] The product flowing out from the discharge pipeline 12 can be transported to a flash evaporation, devolatilization or other device for subsequent treatment as needed.

[0057] Compared with the existing technology, the utility model can achieve the following beneficial effects:

[0058] 1. The use of an external circulation heat exchanger for one or two reactors solves the problem of insufficient heat exchange capacity of the reactor and significantly improves the heat exchange efficiency;

[0059] 2. A liquid distributor is used in the external circulation heat exchanger, so that the material is evenly distributed when entering the static mixer and the external circulation heat exchanger, which increases the effective area of ​​mixing and heat transfer, and further improves the mixing effect of the static mixer and the heat exchange efficiency of the external circulation heat exchanger;

[0060] 3. Placing the static mixer inside the external circulation heat exchanger can improve the heat exchange efficiency, make the materials mixed more evenly, improve the mixing effect, save space, and thus improve space utilization.

[0061] Example

[0062] In this embodiment, a Figure 1 The continuous reaction equipment with the structural design shown is used to synthesize polyether polyols.

[0063] 1150 g of basic polyether polyol, 700 g of styrene, 350 g of acrylonitrile, 65 g of dispersant, 3.5 g of initiator and 225 g of isopropanol were fully mixed and continuously transported to the feed line 1 and the first feed port 2 by a horizontal flow pump. Figure 1In the first reactor 3 shown, a polymerization reaction takes place at 120°C and 0.5MPa. With the continuous addition of the mixed raw materials, the polymerization reaction begins to release heat. At this time, the external circulation pump 5 is turned on, and the reaction material is discharged from the external circulation outlet A at the bottom of the reactor 3. Under the action of the external circulation pump 5, the reaction material flows through the external circulation pipeline, and flows through the liquid distributor 6 and the static mixer 7 in sequence when passing through the external circulation heat exchanger 8. During the flow, the fluid is evenly distributed, and heat is exchanged with the cooling water under the action of the external circulation heat exchanger 8, and the heat contained in the reaction material is taken away. Then, the reaction material flows into the first reactor 3 through the external circulation inlet B at the top of the first reactor 3. During this whole process, the temperature of the reactor 3 is always controlled between 120 and 122°C. Then, the reaction material overflows from the first discharge port 9, is transported through the external delivery pipeline 10, and is transported through the second feed port 13 to enter the second reactor 11, where a polymerization reaction further occurs, and then is discharged from the discharge pipeline 12 through the second discharge port 14. Finally, the material is discharged after being treated by flash evaporation and devolatilization device to obtain the final product, polymer polyol.

[0064] Figure 3 The SEM image of the polymer polyol product prepared in this example is shown, which shows that the dispersed phase in the prepared polymer polyol product is distributed in a staggered manner with large and small particles. Figure 4 The particle size distribution of the product obtained by a laser particle size analyzer is shown.

[0065] It can be seen from the above embodiments that the present application efficiently realizes the synthesis of polymer polyols with a high conversion rate, the properties of the obtained products are stable, and their performance characteristics do not fluctuate significantly over time. In addition, during the continuous reaction process, the temperature in the reaction equipment is always well controlled, and there is no local temperature runaway or temperature out of control, nor does it cause local formation of viscous precipitation or carbon deposition.

Claims

1. A continuous reaction device, characterized in that: The reaction equipment comprises a first reaction kettle (3), a second reaction kettle (11), a liquid distributor (6), a static mixer (7), an external circulation heat exchanger (8), an external circulation pipeline (4) and an external transport pipeline (10); The first reaction kettle (3) comprises a first feed port (2) and a first discharge port (9), the second reaction kettle (11) comprises a second feed port (13) and a second discharge port (14), and the first discharge port (9) is connected to the second feed port (13) via an external transport pipeline (10); The external circulation pipeline (4) is connected to the external circulation outlet (A) at the bottom of the first reaction kettle (3) and the external circulation inlet (B) at the top of the first reaction kettle (3); The external circulation heat exchanger (8) is connected to the external circulation pipeline (4), and the liquid distributor (6) and the static mixer (7) are arranged inside the external circulation heat exchanger (8), the liquid distributor (6) is located at the lower part of the external circulation heat exchanger (8), and the static mixer (7) is located above the liquid distributor (6).

2. The continuous reaction equipment according to claim 1, characterized in that: The liquid distributor (6) is arranged inside the external circulation heat exchanger (8) and the feed port of the liquid distributor (6) is connected to the feed port of the liquid distributor (6); the feed port of the static mixer (7) is connected to the discharge port of the liquid distributor (6); the discharge port of the static mixer (7) is connected to the discharge port of the external circulation heat exchanger (8).

3. The continuous reaction equipment according to claim 1, characterized in that: The first feed port (2) of the first reaction kettle (3) is connected to the feed pipeline (1), and the second discharge port (14) of the second reaction kettle (11) is connected to the discharge pipeline (12).

4. The continuous reaction equipment according to claim 1, characterized in that: The external circulation pipeline (4) is connected to an external circulation pump (5).

5. The continuous reaction equipment according to claim 4, characterized in that: The external circulation pump (5) is arranged between the external circulation outlet (A) and the external circulation heat exchanger (8), or between the external circulation heat exchanger (8) and the external circulation inlet (B), or a combination of the above situations.

6. The continuous reaction equipment according to claim 1, characterized in that: The length-to-diameter ratio of the external circulation heat exchanger is 5:1 to 12:

1.

7. The continuous reaction equipment according to claim 1, characterized in that: The first reactor and the second reactor are respectively provided with stirring devices.

8. The continuous reaction device according to any one of claims 1 to 7, characterized in that: The continuous reaction equipment further comprises a second external circulation pipeline (15) and a second external circulation heat exchanger (16), the second external circulation heat exchanger (16) being connected to the second external circulation pipeline (15), a second liquid distributor (17) and a second static mixer (18) being arranged inside the second external circulation heat exchanger (16), the second liquid distributor (17) being located at the lower part inside the second external circulation heat exchanger (16), the second static mixer (18) being located above the second liquid distributor (17), and the second external circulation pipeline (15) being connected to a second external circulation outlet (C) at the bottom of the second reactor (11) and a second external circulation inlet (D) at the top of the second reactor (11).

9. The continuous reaction equipment according to claim 1, characterized in that: The continuous reaction device is a reaction device used to carry out polymerization reaction in a continuous manner to prepare polymer polyol.

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