Closed adding device for polyether polyol catalyst

Abstract

The utility model belongs to the technical field of polyether polyol catalyst production devices, and particularly relates to a closed polyether polyol catalyst adding device which comprises a mounting frame, a reaction kettle, a mixing tank and a replacement tank, an air pump is mounted outside the mounting frame, a nitrogen tank is arranged outside the mounting frame, and the nitrogen tank is communicated with the reaction kettle. A first exhaust pipe is installed between the input end of the air pump and the nitrogen tank, a first gas guide pipe is installed between the output end of the air pump and the replacement tank, an air replacement pipe is installed between the replacement tank and the nitrogen tank, an air eliminator is arranged outside the air replacement pipe, a feeding hopper is installed at the top of the replacement tank, and a feeding valve is arranged outside the feeding hopper. And a replacement valve is arranged outside the air replacement pipe. According to the utility model, the nitrogen and the air are replaced in the replacement tank, the gas except the nitrogen in the air is removed through the air eliminator, and then the nitrogen is circulated, so that the closed addition is completed, and the energy recycling is realized at the same time.

Description

TECHNICAL FIELD

[0001] The utility model relates to polyether polyol catalyst production device technical field, concretely is a kind of polyether polyol catalyst closed addition device. BACKGROUND

[0002] Polyether polyol production process is by initiator (compound containing active hydrogen group) and ethylene oxide (EO), propylene oxide (PO), butylene oxide (B0) etc. are obtained polyether polyol by polymerization in the presence of catalyst. Most polyether synthesis adopts KOH catalysis, and the process must be carried out complicated KOH post-processing procedure due to large catalyst dosage, long production cycle, low production efficiency, and prominent three waste problems. At present, catalyst addition is mainly manual powder bimetallic catalyst weighing 300-400g, then mixed into base polyether, and after manual stirring is uniform, pour into reaction kettle. The addition mode cannot be closed, and a large amount of air is mixed in the process of mixing, stirring and entering the kettle, which is easy to cause polyether oxidation deterioration, and also easy to cause the oxygen content of reaction kettle to exceed the standard. In the polymerization process, high-concentration oxygen is easy to cause safety problems due to the mixing of PO / EO and other flammable and explosive media.

[0003] The prior art has the following defects or problems: the prior art with publication number CN215693848U discloses a polyether polyol catalyst closed addition device, which comprises a feeding hopper, a mixing hopper, a reaction kettle, a nitrogen replacement pipeline and a replacement tail gas pipeline; the top of the feeding hopper is provided with a catalyst mixed liquid adding port, and the bottom discharge port is connected to the top feed port of the mixing hopper; one side of the upper part of the mixing hopper is connected to a starter adding pipeline, the bottom discharge port is connected to the top feed port of the reaction kettle, and the bottom discharge port of the mixing hopper is also connected to the nitrogen replacement pipeline, and the top is also connected to the replacement tail gas pipeline.

[0004] The above-mentioned device can add catalyst mixed liquid into the reaction kettle in a sealed state during use, to ensure product quality and safe production.

[0005] In actual process, the above-mentioned content cannot recycle nitrogen while adding in a closed manner, cannot realize the cyclic use of nitrogen, has strong energy consumption, and cannot create a vacuum environment to sufficiently remove air medium in polyether polyol catalyst, so it is necessary to propose a polyether polyol catalyst closed addition device.

[0006] It should be noted that the above-mentioned content belongs to the technical cognition range of the inventor and does not necessarily constitute prior art. UTILITY MODEL CONTENT

[0007] In view of the deficiencies of the prior art, the utility model provides a polyether polyol catalyst closed addition device to solve the existing problems.

[0008] In order to achieve the above object, the utility model provides the following technical scheme: a kind of polyether polyol catalyst closed addition device, including mounting bracket, reaction kettle, mixing tank and replacement tank, the outside of mounting bracket is equipped with air pump, the outside of mounting bracket is provided with nitrogen tank, first air extraction pipe is installed between the input of air pump and nitrogen tank, first air pipe is installed between the output of air pump and replacement tank, air replacement pipe is installed between replacement tank and nitrogen tank, the outside of air replacement pipe is provided with air eliminator.

[0009] As a preferred technical scheme of the utility model, the top of the replacement tank is provided with a feed hopper, the outside of the feed hopper is provided with a feed valve, the outside of the air replacement pipe is provided with a replacement valve, and the outside of the first air pipe is provided with an air inlet valve.

[0010] As a preferred technical scheme of the utility model, a first discharge pipe is connected between the replacement tank and the mixing tank, the outside of the first discharge pipe is provided with a first discharge valve, and the top of the mixing tank is provided with a pressure detector.

[0011] As a preferred technical scheme of the utility model, a vacuum pump is installed on the outside of the mounting bracket, a second air extraction pipe is installed between the input of the vacuum pump and the mixing tank, the outside of the second air extraction pipe is provided with an exhaust valve, a vacuum tank is provided on the outside of the mounting bracket, and a second air pipe is installed between the output of the vacuum pump and the vacuum tank.

[0012] As a preferred technical scheme of the utility model, a second discharge pipe is connected between the mixing tank and the reaction kettle, the outside of the second discharge pipe is provided with a second discharge valve, a nitrogen injection port is provided on the top of the nitrogen tank, and a switch valve is provided on the outside of the nitrogen injection port.

[0013] As a preferred technical scheme of the utility model, a pressure relief port is provided on the top of the vacuum tank, and a pressure relief valve is provided on the outside of the pressure relief port.

[0014] As a preferred technical scheme of the utility model, a discharge pipe is provided on the bottom of the reaction kettle, a discharge valve is provided on the outside of the discharge pipe, and the discharge pipe is connected with a sealed material taking device.

[0015] Compared with the prior art, the utility model provides a polyether polyol catalyst closed addition device, which has the following beneficial effects:

[0016] One, the polyether polyol catalyst closed adding device, through setting up air pump, nitrogen tank, air displacement pipe and air eliminator, through displacement tank inside with nitrogen and air is displaced, and through air eliminator to the gas except nitrogen in air is removed, and nitrogen is recycled, completes closed adding, also realizes energy recycling utilization;

[0017] Two, the polyether polyol catalyst closed adding device, through setting up vacuum pump and mixing tank, through vacuum pump extracts the gas in mixing tank, prevents gas influence catalyst stock solution and reaction body causes polyether oxidation metamorphism and other adverse effects. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is whole structure schematic diagram of the utility model;

[0019] Figure 2 It is air pump's connection structure schematic diagram of the utility model;

[0020] Figure 3 It is vacuum pump's connection structure schematic diagram of the utility model;

[0021] Figure 4 It is front structure schematic diagram of the utility model.

[0022] In the drawing: 1, mounting bracket;2, reaction kettle;3, mixing tank;4, displacement tank;5, air pump;6, nitrogen tank;7, first air pipe;8, first air pipe;9, air displacement pipe;10, air eliminator;11, feed hopper;12, feed valve;13, displacement valve;14, first discharge pipe;15, first discharge valve;16, pressure detector;17, vacuum pump;18, second air pipe;19, exhaust valve;20, vacuum tank;21, second air pipe;22, second discharge pipe;23, second discharge valve;24, nitrogen injection port;25, switch valve;26, pressure relief port;27, pressure relief valve;28, discharge pipe;29, discharge valve;30, inlet valve. DETAILED DESCRIPTION

[0023] In order to more clearly understand the above purpose, features and advantages of the utility model, the utility model is further explained below in conjunction with the drawings and examples.It needs to be explained that, in the case of no conflict, the embodiment of the application and the features in the embodiment can be combined with each other.

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Example 1

[0026] like Figures 1-4 As shown, this utility model provides a technical solution: a closed-loop addition device for polyether polyol catalysts, including a mounting frame 1, a reaction vessel 2, a mixing tank 3, and a displacement tank 4. An air pump 5 is installed outside the mounting frame 1, and a nitrogen tank 6 is installed outside the mounting frame 1. A first suction pipe 7 is installed between the input end of the air pump 5 and the nitrogen tank 6. A first air guide pipe 8 is installed between the output end of the air pump 5 and the displacement tank 4. An air displacement pipe 9 is installed between the displacement tank 4 and the nitrogen tank 6. An air eliminator 10 is installed outside the air displacement pipe 9. A feed hopper 11 is installed on the top of the displacement tank 4. A feed valve 12 is installed outside the feed hopper 11. A displacement valve 13 is installed outside the air displacement pipe 9. An air inlet valve 30 is installed outside the first air guide pipe 8. A first discharge pipe 14 connects the displacement tank 4 and the mixing tank 3. A first discharge valve 15 is installed outside the first discharge pipe 14. A pressure detector 16 is installed on the top of the mixing tank 3.

[0027] In this embodiment, the feed valve 12 is opened, and the air inlet valve 30, the displacement valve 13, and the first discharge valve 15 are closed. The catalyst stock solution and the reactant are injected into the displacement tank 4 through the feed hopper 11. After the injection is completed, the feed valve 12 is closed, and the air inlet valve 30 is opened. The nitrogen in the nitrogen tank 6 is introduced into the displacement tank 4 through the first air guide pipe 8 via the air pump 5 and the first air extraction pipe 7. The displacement valve 13 is opened, and the nitrogen in the displacement tank 4 discharges the air from the air displacement pipe 9. The air and nitrogen flow together from the air displacement pipe 9 through the air eliminator 10. Oxygen and other gases are eliminated by the air eliminator 10, while the nitrogen re-enters the nitrogen tank 6 through the air displacement pipe 9. The air inlet valve 30 and the displacement valve 13 are closed, and the first discharge valve 15 is opened, allowing the catalyst stock solution and the reactant to enter the mixing tank 3 for mixing. The pressure state inside the mixing tank 3 can be observed by the pressure detector 16.

[0028] Example 2

[0029] like Figures 1-4As shown, the outside of the mounting rack 1 is provided with a vacuum pump 17, a second air extraction pipe 18 is arranged between the input end of the vacuum pump 17 and the mixing tank 3, an exhaust valve 19 is arranged outside the second air extraction pipe 18, a vacuum tank 20 is arranged outside the mounting rack 1, a second air guide pipe 21 is arranged between the output end of the vacuum pump 17 and the vacuum tank 20, a second discharging pipe 22 is communicated between the mixing tank 3 and the reaction kettle 2, a second discharging valve 23 is arranged outside the second discharging pipe 22, a nitrogen injection port 24 is arranged at the top of the nitrogen tank 6, an on-off valve 25 is arranged outside the nitrogen injection port 24, a pressure relief port 26 is arranged at the top of the vacuum tank 20, a pressure relief valve 27 is arranged outside the pressure relief port 26, a discharging pipe 28 is arranged at the bottom of the reaction kettle 2, a discharging valve 29 is arranged outside the discharging pipe 28, and the discharging pipe 28 is connected with a sealed discharging device.

[0030] In this embodiment, the exhaust valve 19 is opened, the gas in the mixing tank 3 is extracted by the vacuum pump 17 and the second air extraction pipe 18, and is introduced into the inside of the vacuum tank 20 through the second air guide pipe 21, the vacuum tank 20 can be adaptively pressure relieved through the pressure relief port 26 and the pressure relief valve 27, the gas in the mixing tank 3 is extracted by the vacuum pump 17, so as to prevent the gas from affecting the catalyst raw liquid and the reaction body and causing the polyether to be oxidized and deteriorated, the second discharging valve 23 is opened, and the mixed liquid enters the inside of the reaction kettle 2 from the second discharging pipe 22 to react, and after the reaction is completed, it is discharged through the cooperation of the discharging pipe 28 and the discharging valve 29.

[0031] The working principle of this embodiment is as follows: in use, the feeding valve 12 is opened, the air inlet valve 30, the displacement valve 13 and the first discharging valve 15 are closed, the catalyst raw liquid and the reaction body are injected into the inside of the displacement tank 4 through the feeding hopper 11, after the injection is completed, the feeding valve 12 is closed, the air inlet valve 30 is opened, the nitrogen in the nitrogen tank 6 is introduced into the inside of the displacement tank 4 through the first air guide pipe 8 by the air pump 5 and the first air extraction pipe 7, the displacement valve 13 is opened, the nitrogen in the inside of the displacement tank 4 discharges the air from the air displacement pipe 9, the air and the nitrogen flow out from the air displacement pipe 9 through the air eliminator 10, the oxygen and other remaining gases are eliminated by the air eliminator 10, and the nitrogen reenters the inside of the nitrogen tank 6 through the air displacement pipe 9, the nitrogen and the air are displaced in the inside of the displacement tank 4, the gases other than the nitrogen in the air are removed by the air eliminator 10, and the nitrogen is recycled, so as to realize the closed addition and the energy recycling utilization at the same time;

[0032] Close the inlet valve 30 and the displacement valve 13, open the first discharging valve 15, make the catalyst stock solution and the reaction body enter the inside of the mixing tank 3 to mix, can observe the air pressure state in the inside of the mixing tank 3 through the pressure detector 16, open the exhaust valve 19, through the vacuum pump 17 and the second air extraction pipe 18, the gas in the inside of the mixing tank 3 is extracted, and is guided into the inside of the vacuum tank 20 through the second air guide pipe 21, through the pressure relief port 26 and the pressure relief valve 27, the vacuum tank 20 can be self-adapting pressure relief processing, through the vacuum pump 17, the gas in the inside of the mixing tank 3 is extracted, prevents the gas from influencing the catalyst stock solution and the reaction body to cause polyether oxidation deterioration and oxygen content to exceed the standard;

[0033] Open the second discharging valve 23, the mixed solution enters the inside of the reaction kettle 2 from the second discharging pipe 22 to carry out the reaction, after the reaction is completed, is discharged through the discharge pipe 28 and the discharge valve 29 cooperation.

[0034] The above, only is the preferred embodiment of the utility model, and is not to other forms of the utility model limit, any skilled in the art technical personnel can utilize the above disclosed technical content to change or modify as equivalent variation equivalent embodiment applied in other fields, but any simple modification, equivalent change and modification of the above embodiment, which does not deviate from the technical scheme content of the utility model, according to the technical essence of the utility model, still belongs to the protection scope of the technical scheme of the utility model.

Claims

1. A closed-loop addition device for a polyether polyol catalyst, characterized in that: The assembly includes a mounting frame (1), a reaction vessel (2), a mixing tank (3), and a displacement tank (4). An air pump (5) is installed on the outside of the mounting frame (1), and a nitrogen tank (6) is installed on the outside of the mounting frame (1). A first suction pipe (7) is installed between the input end of the air pump (5) and the nitrogen tank (6). A first air guide pipe (8) is installed between the output end of the air pump (5) and the displacement tank (4). An air displacement pipe (9) is installed between the displacement tank (4) and the nitrogen tank (6). An air eliminator (10) is installed on the outside of the air displacement pipe (9).

2. The closed-loop addition device for a polyether polyol catalyst according to claim 1, characterized in that: The top of the replacement tank (4) is equipped with a feed hopper (11), the outside of the feed hopper (11) is provided with a feed valve (12), the outside of the air replacement pipe (9) is provided with a replacement valve (13), and the outside of the first air guide pipe (8) is provided with an air inlet valve (30).

3. The closed-loop addition device for a polyether polyol catalyst according to claim 1, characterized in that: A first discharge pipe (14) is connected between the replacement tank (4) and the mixing tank (3). A first discharge valve (15) is provided on the outside of the first discharge pipe (14). A pressure detector (16) is provided on the top of the mixing tank (3).

4. The closed-loop addition device for a polyether polyol catalyst according to claim 1, characterized in that: A vacuum pump (17) is installed on the outside of the mounting bracket (1). A second suction pipe (18) is installed between the input end of the vacuum pump (17) and the mixing tank (3). An exhaust valve (19) is provided on the outside of the second suction pipe (18). A vacuum tank (20) is provided on the outside of the mounting bracket (1). A second air guide pipe (21) is installed between the output end of the vacuum pump (17) and the vacuum tank (20).

5. The closed-loop addition device for a polyether polyol catalyst according to claim 1, characterized in that: A second discharge pipe (22) is connected between the mixing tank (3) and the reaction vessel (2). A second discharge valve (23) is provided on the outside of the second discharge pipe (22). A nitrogen injection port (24) is provided on the top of the nitrogen tank (6). A switch valve (25) is provided on the outside of the nitrogen injection port (24).

6. The closed-loop addition device for a polyether polyol catalyst according to claim 4, characterized in that: The top of the vacuum tank (20) is provided with a pressure relief port (26), and a pressure relief valve (27) is provided outside the pressure relief port (26).

7. The closed-loop addition device for a polyether polyol catalyst according to claim 1, characterized in that: The bottom of the reactor (2) is provided with a discharge pipe (28), and a discharge valve (29) is provided on the outside of the discharge pipe (28). The discharge pipe (28) is connected to a sealed material taking device.

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