Pilot-scale test kettle for producing polyester polyol

Abstract

The utility model relates to the technical field of polyester polyol production, in particular to a pilot plant test kettle for polyester polyol production, which comprises a kettle body, a control valve is fixedly connected to the bottom end of the kettle body, a bearing mechanism is arranged below the control valve, a driving mechanism is arranged on the bearing mechanism in a matched manner, and the bearing mechanism comprises a connecting flange. A pipe body is arranged in the connecting flange, and threads are formed in the top end of the outer side wall of the pipe body and the inner side wall of the connecting flange. According to the reaction kettle, the connecting flange is connected with the flange plate, the air cylinder is started to control the position of the piston plate and adjust the liquid receiving amount of the pipe body during use, then the control valve is opened to enable reaction liquid in the kettle body to flow into the pipe body, a user enables a needle head of a needle cylinder to penetrate through a through hole and then sucks the reaction liquid for sampling, and after sampling is completed, the control valve is opened. The air cylinder is started to drive the piston plate to move upwards, and the reaction liquid in the pipe body is pushed into the kettle body again, so that the problem of waste of the reaction liquid is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of polyester polyol production, in particular to a pilot reactor for polyester polyol production. Background Art

[0002] In the production of polyester polyols, polyols (ethylene glycol, propylene glycol, diethylene glycol, trimethylolpropane, pentaerythritol, 1,4-butanediol, etc.) are esterified and polycondensed with dibasic acids (phthalic acid, adipic acid, halogenated phthalic acid, etc.) or acid anhydrides (phthalic anhydride, etc.) at 140-200°C. The reaction process is mostly carried out in a reactor. Generally, when producing chemical products, there are three stages. The first stage is laboratory testing (commonly known as "small test"), the second stage: pilot test, and the third stage: mass production (mass production can basically be carried out after the pilot test is successful). During the pilot test, many problems that did not occur in the laboratory small test may occur, and personnel need to intermittently check the reaction conditions. The reaction liquid in the pilot test is sampled, and then the sample is tested by liquid chromatography or other methods to determine the degree of reaction and the reaction effect. However, most pilot reactors have discharge ports at the bottom. When the reaction liquid in the reaction needs to be sampled, the most common sampling method is for the staff to turn the discharge valve at the bottom of the pilot reactor to release a small portion of the reaction liquid in the reaction through the discharge valve to complete the sampling process. However, the samples required for general testing are relatively small, and there is generally a stirring device inside the pilot reactor to improve the mixing reaction effect of the reaction liquid. When the stirring device is started, the liquid flow inside it is turbulent. Even if the discharge valve is slightly turned, it is still easy to release a little more reaction liquid, which will cause a certain degree of waste of the reaction liquid, which is inconvenient. Utility Model Content

[0003] The utility model aims to provide a pilot reactor for producing polyester polyols to solve the problems raised in the above-mentioned background technology.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A pilot reactor for producing polyester polyols, comprising a reactor body, wherein a control valve is fixedly connected to the bottom of the reactor body, a receiving mechanism is arranged below the control valve, and a driving mechanism is arranged in a matching manner for the receiving mechanism;

[0006] The receiving mechanism includes a connecting flange, and a tube body is arranged inside the connecting flange, threads are provided on the top of the outer wall of the tube body and the inner wall of the connecting flange, and the top of the outer wall of the tube body is screwed and connected with the inner wall of the connecting flange, a piston plate is slidably sleeved inside the tube body, and a connecting hole is provided on one side of the piston plate, a catheter is fixedly sleeved inside the connecting hole, and a soft plug is fixedly embedded at one end of the catheter, and the soft plug is equipped with a syringe.

[0007] Furthermore, the driving mechanism includes a U-shaped frame, and the top ends of both arms of the U-shaped frame are fixedly connected to the outer side wall of the connecting flange, the top surface of the U-shaped frame is fixedly connected to a cylinder, and the movable end of the cylinder is located below the bottom surface of the piston plate.

[0008] Furthermore, the movable end of the cylinder is fixedly connected with a connecting head, the bottom surface of the piston plate is fixedly connected with a fixing ring, and the connecting head is movably embedded in the fixing ring, the outer wall of the connecting head and the outer wall of the fixing ring are both provided with circular through holes, and a pin is matched between the two circular through holes, and the pin is movably inserted into the two circular through holes.

[0009] Preferably, an isolation pad is fixedly connected to the top surface of the piston plate, and a circular hole is opened on the top surface of the isolation pad, and the inside of the circular hole is connected to the inside of the conduit.

[0010] Preferably: one end of the latch is a hemispherical structure.

[0011] Preferably: the other end of the latch is fixedly connected with a pull rope.

[0012] Furthermore, a receiving shell is fixedly sleeved on the outer side wall of the tube body.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] The connecting flange is connected to the flange plate by using a connecting piece. When in use, the user can control the position of the piston plate by starting the cylinder, adjust the amount of liquid that the tube body can hold, and then open the control valve to allow the reaction liquid in the kettle body to flow out to the inside of the tube body. Then the user passes the syringe needle through the through hole on the soft plug and draws the reaction liquid for sampling. After sampling, the cylinder is started to drive the piston plate to move up, and the reaction liquid in the tube body is pushed back into the kettle body, thereby reducing the problem of waste of reaction liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 It is a schematic diagram of the positional relationship between the receiving mechanism and the driving mechanism in the utility model;

[0017] Figure 3 It is an exploded diagram of the receiving mechanism structure in the utility model;

[0018] Figure 4 It is an exploded diagram of the driving mechanism structure in the utility model.

[0019] In the figure: 100, kettle body; 200, control valve; 300, receiving mechanism; 301, connecting hole; 310, connecting flange; 320, pipe body; 330, piston plate; 340, insulating pad; 350, catheter; 351, soft plug; 360, syringe; 370, receiving shell; 400, driving mechanism; 410, U-shaped frame; 420, cylinder; 430, connector; 440, fixing ring; 441, latch; 442, pull rope. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] See also Figures 1 to 4 In the embodiment of the utility model, a pilot reactor for producing polyester polyols includes a reactor body 100, and a control valve 200 is fixedly connected to the bottom of the reactor body 100, a receiving mechanism 300 is arranged below the control valve 200, and the receiving mechanism 300 is equipped with a driving mechanism 400;

[0022] The receiving mechanism 300 includes a connecting flange 310, and a tube body 320 is arranged inside the connecting flange 310, threads are provided on the top of the outer wall of the tube body 320 and the inner wall of the connecting flange 310, and the top of the outer wall of the tube body 320 is screwed and connected with the inner wall of the connecting flange 310, a piston plate 330 is slidably sleeved inside the tube body 320, and a connecting hole 301 is provided on one side of the piston plate 330, a catheter 350 is fixedly sleeved inside the connecting hole 301, and a soft plug 351 is fixedly embedded at one end of the catheter 350, and a syringe 360 ​​is provided in conjunction with the soft plug 351.

[0023] Specifically, the control valve 200 is mostly connected to the kettle body 100 through a flange. The user can use a connector to connect the connecting flange 310 to the flange at the bottom of the control valve 200 to connect the inside of the pipe body 320 with the valve. Then, the user can hold the piston plate 330 through the driving mechanism 400 to control the amount of liquid that the pipe body 320 can receive. When the user needs to sample the reaction liquid in the kettle body 100, the user can open the control valve 200 to allow the reaction liquid in the kettle body 100 to fall into the pipe body 320. The body 320 and the catheter 350 are blocked by the soft plug 351. The soft plug 351 is a replaceable part. It is directly embedded in the catheter 350 to seal the catheter 350. When replacing, it can be pulled out and replaced. The soft plug 351 is fluororubber. When polyester polyol is produced, its temperature is below 200 degrees Celsius for esterification and polycondensation reaction, and then it will be kept at 200 to 230 degrees Celsius for a period of time. Fluororubber has excellent temperature resistance and chemical stability. The maximum operating temperature of fluororubber can reach more than 300 degrees Celsius. The soft plug 351 is not easily affected by the reaction liquid, and a through hole is opened in the middle of one end of the soft plug 351. However, due to the elasticity of the fluororubber, the through hole on the soft plug 351 in the conduit 350 shrinks due to the elasticity of the fluororubber itself and is not easy to leak the reaction liquid. Then the user can puncture the through hole with the needle on the syringe 360, and then the user uses the syringe 360 ​​to suck the reaction liquid for detection, so that the user can sample. After the sampling is completed, the user can open the control valve 200 to make the kettle body 1 00 is connected with the interior of the tube body 320, and then the user can start the driving mechanism 400 to move the piston plate 330 upward, so that most of the reaction liquid in the tube body 320 is pushed back into the control valve 200 and the kettle body 100, and then the control valve 200 is closed to allow the reaction liquid that re-enters the kettle body 100 to continue to react, and then the user can rotate the tube body 320 to remove it from the connecting flange 310, and clean it together with the piston plate 330 inside it, so that it can receive the reaction liquid for the next sampling.

[0024] Embodiment 1

[0025] like Figure 4 As shown, in this embodiment, the driving mechanism 400 includes a U-shaped frame 410, and the top ends of both arms of the U-shaped frame 410 are fixedly connected to the outer wall of the connecting flange 310, and a cylinder 420 is fixedly connected to the inner top surface of the U-shaped frame 410, and the movable end of the cylinder 420 is located below the bottom surface of the piston plate 330.

[0026] In this embodiment, the user can start the cylinder 420, move the movable end of the cylinder 420 to a suitable height, and then limit the piston plate 330 to control the amount of liquid that the tube body 320 can receive. After sampling is completed, the user can start the movable end of the cylinder 420 to push the piston plate 330 so that the piston plate 330 pushes the excess reaction liquid in the tube body 320 back into the kettle body 100.

[0027] like Figure 3-4 As shown, in the present embodiment, the movable end of the cylinder 420 is fixedly connected with a connecting head 430, the bottom surface of the piston plate 330 is fixedly connected with a fixing ring 440, and the connecting head 430 is movably embedded in the fixing ring 440, and the outer wall of the connecting head 430 and the outer wall of the fixing ring 440 are both provided with circular through holes, and a latch 441 is matched between the two circular through holes, and the latch 441 is movably inserted into the two circular through holes, one end of the latch 441 is a hemispherical structure, and the other end of the latch 441 is fixedly connected with a pull rope 442, the top surface of the piston plate 330 is fixedly connected with an isolation pad 340, and the top surface of the isolation pad 340 is provided with a circular hole, and the inside of the circular hole is connected with the inside of the conduit 350.

[0028] During specific implementation, the connecting head 430 is embedded in the fixing ring 440 by controlling the cylinder 420, and the two circular through holes are aligned. Then, the user passes the pin 441 through the two circular through holes so that the movable end of the cylinder 420 can synchronously drive the piston plate 330 to move, thereby improving the movement stability of the piston plate 330 when the movable end of the cylinder 420 pushes it. The user can control the connection between the piston plate 330 and the connecting head 430 by plugging and unplugging the pin 441. One end of the pin 441 is a hemispherical structure, which is convenient for the pin 441 to pass through the circular through hole, and the pull rope 442 is convenient for the user to pull out the pin 441. The piston plate 330 can be made of heat-resistant rubber material to improve the sealing performance, and the insulating pad 340 can be made of heat-insulating material, which can be made of ceramic, titanium alloy and other materials, thereby avoiding the reaction liquid and the internal temperature of the kettle body 100 from having a greater impact on the piston plate 330.

[0029] Embodiment 2

[0030] On the basis of Example 1, in order to compensate for the fact that when the tube body 320 and its internal piston plate 330 in Example 1 are removed for cleaning, some reaction liquid may remain inside the control valve 200 and drip, and may drip onto people's hands and cause injuries, a receiving shell 370 is provided to collect the residual reaction liquid inside the control valve 200.

[0031] like Figure 1-4 As shown, in this embodiment, the outer wall of the tube body 320 is fixedly sleeved with a receiving shell 370 .

[0032] In specific implementation, when the user rotates the tube body 320 to unscrew it from the connecting flange 310, the hand is located under the receiving shell 370, and the receiving shell 370 has a larger diameter so that it can cover the user's body parts. During the process of unscrewing the tube body 320, the residual liquid inside the control valve 200 will be received by the receiving shell 370 and the tube body 320 when it flows out, so it is not easy to affect the user.

[0033] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0034] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A pilot reactor for producing polyester polyols, comprising a reactor body (100), wherein a control valve (200) is fixedly connected to the bottom end of the reactor body (100), characterized in that: A receiving mechanism (300) is provided below the control valve (200), and the receiving mechanism (300) is matched with a driving mechanism (400); The receiving mechanism (300) comprises a connecting flange (310), and a tube body (320) is arranged inside the connecting flange (310), the top end of the outer wall of the tube body (320) and the inner wall of the connecting flange (310) are both provided with threads, and the top end of the outer wall of the tube body (320) is screwed and connected with the inner wall of the connecting flange (310), a piston plate (330) is slidably sleeved inside the tube body (320), and a connecting hole (301) is provided on one side of the piston plate (330), a catheter (350) is fixedly sleeved inside the connecting hole (301), and a soft plug (351) is fixedly embedded at one end of the catheter (350), and a syringe (360) is matched with the soft plug (351).

2. A pilot reactor for producing polyester polyols according to claim 1, characterized in that: The driving mechanism (400) comprises a U-shaped frame (410), and the top ends of both arms of the U-shaped frame (410) are fixedly connected to the outer wall of the connecting flange (310), and the inner top surface of the U-shaped frame (410) is fixedly connected to a cylinder (420), and the movable end of the cylinder (420) is located below the bottom surface of the piston plate (330).

3. A pilot reactor for producing polyester polyols according to claim 2, characterized in that: The movable end of the cylinder (420) is fixedly connected to a connecting head (430), the bottom surface of the piston plate (330) is fixedly connected to a fixing ring (440), and the connecting head (430) is movably embedded in the fixing ring (440), the outer wall of the connecting head (430) and the outer wall of the fixing ring (440) are both provided with circular through holes, and a latch (441) is matched between the two circular through holes, and the latch (441) is movably inserted into the two circular through holes.

4. A pilot reactor for producing polyester polyols according to claim 3, characterized in that: The top surface of the piston plate (330) is fixedly connected with an isolation pad (340), and a circular hole is opened on the top surface of the isolation pad (340), and the inside of the circular hole is connected with the inside of the conduit (350).

5. The pilot reactor for producing polyester polyol according to claim 3, characterized in that: One end of the latch (441) is a hemispherical structure.

6. The pilot reactor for producing polyester polyol according to claim 3, characterized in that: The other end of the latch (441) is fixedly connected to a pull rope (442).

7. A pilot reactor for producing polyester polyol according to claim 4, characterized in that: The outer wall of the tube body (320) is fixedly sleeved with a receiving shell (370).

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