A low constant temperature synthesis reaction device for polycarboxylate water reducer

Abstract

The invention discloses a low-constant temperature synthesis reaction device for polycarboxylic acid water-reducing agent, and relates to the field of polycarboxylic acid water-reducing agent synthesis. The device comprises a reactor, a cooler and a heat exchanger. The top of the reactor is provided with a feed port and an addition port, the bottom is provided with a discharge port, the shell of the reactor has an interlayer, the lower part of the interlayer is connected to a cooling water inlet pipe, and the upper part is connected to a cooling water outlet pipe. The cooler is connected to the other end of the cooling water inlet pipe and the cooling water outlet pipe. The heat exchanger comprises a plurality of heat exchanger plates in parallel, and two adjacent heat exchanger plates are respectively connected to the reactor and the cooler; wherein, a liquid inlet pipe and a liquid outlet pipe are connected between the reactor and the heat exchanger, and a water inlet pipe and a water outlet pipe are connected between the cooler and the heat exchanger. The synthesis device circulates and continuously cools the reaction liquid by introducing the cooling water in the reaction liquid and the cooler into adjacent heat exchanger plates respectively, thereby greatly improving the cooling efficiency and synthesis effect, and being able to maintain a constant temperature all the time.

Description

Technical Field

[0001] The invention relates to the field of polycarboxylate water-reducing agent synthesis, in particular to a low-constant-temperature synthesis reaction device for polycarboxylate water-reducing agent. Background Art

[0002] Polycarboxylate water reducer replaced the previous generation of naphthalene water reducer and is called the third generation of high-performance water reducer. No "three wastes" are produced during its production process, and it is a green and environmentally friendly material. The macromonomer used in domestic polycarboxylate water reducers has gradually developed from the initial low-activity APEG to the high-activity TPEG and HPEG. The development from low-activity to high-activity macromonomers is in line with the historical development trend of water reducers.

[0003] Recently, a high-activity macromonomer of vinyl ether polyethylene glycol (VPEG, EPEG) has appeared on the market. Due to the high activity of this macromonomer, the reaction needs to be completed under low constant temperature conditions. If the low constant temperature synthesis reaction temperature is to be accurately controlled, a low constant temperature reaction device is required. Only in this way can a polycarboxylic acid water reducer with excellent performance be synthesized. At present, the cooling of the reactor is generally completed by passing cooling water through the jacket. This operation takes a long time and consumes high energy. In addition, it is extremely difficult to control the low temperature and maintain a constant cooling speed and effect. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a low-constant temperature synthesis reaction device for polycarboxylic acid water-reducing agent, which can circulate and continuously cool the reaction liquid by introducing the reaction liquid and the cooling water in the cooler into adjacent heat exchanger plates respectively, thereby greatly improving the cooling efficiency and synthesis effect, and can always maintain a constant temperature.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A low constant temperature synthesis reaction device for polycarboxylate water reducer, characterized by comprising:

[0007] The reactor has a feed port and several addition ports on the top and a discharge port on the bottom. The shell of the reactor has an interlayer inside, the lower part of the interlayer is connected to a cooling water inlet pipe, and the upper part is connected to a cooling water outlet pipe.

[0008] A cooler is connected to the other end of the cooling water inlet pipe and the cooling water outlet pipe.

[0009] A heat exchanger, wherein the heat exchanger comprises a plurality of heat exchanger plates connected in parallel, and two adjacent heat exchanger plates are respectively connected to the reactor and the cooler; wherein a liquid inlet pipe and a liquid outlet pipe are connected between the reactor and the heat exchanger, and a water inlet pipe and a water outlet pipe are connected between the cooler and the heat exchanger.

[0010] The cooling water inlet pipe, the cooling water outlet pipe, the liquid inlet pipe, the liquid outlet pipe, the water inlet pipe and the water outlet pipe are all connected with a circulation pump and a stop valve.

[0011] A further technical solution is that a stirring device is also provided inside the reactor, and the stirring device includes a stirring rod horizontally mounted on the inner wall of the reactor, and the number of the stirring rods is two. A plurality of stirring plates are arranged around the side walls of the stirring rods at intervals, and the stirring rods are rotatably connected to the inner wall of the reactor, and one end of the stirring rod passes through the outer shell of the reactor and is sleeved with a driving gear, and a transmission gear meshing with both driving gears is fixed in the middle of the two driving gears, and the central axis of the transmission gear is dynamically connected to a driving motor.

[0012] A further technical solution is that the stirring blades are of a right-angled trapezoidal structure, and the stirring blades on the two stirring rods are arranged in opposite directions along the central axis of the stirring rods.

[0013] A further technical solution is that the stirring blade is a grid-like structure.

[0014] A further technical solution is that the upper part of the reactor is a truncated cone structure with a bottom radius larger than the top radius, the middle part of the reactor is a cylindrical structure snap-fitted with the upper part, and the lower part of the reactor is a truncated cone structure snap-fitted with the middle part with a top radius larger than the bottom radius.

[0015] A further technical solution is that the stirring rod is mounted in the middle of the reactor.

[0016] A further technical solution is that the cooler is a circulating water refrigerator.

[0017] A further technical solution is that the reactor is also connected to a thermometer.

[0018] The beneficial effects of adopting the above technical solution are:

[0019] The device adopts a new connection method, using parallel heat exchanger plates to achieve dual cooling of the reactor and reaction liquid.

[0020] First, cooling water is passed into the outer shell interlayer of the reactor through a cooler, thereby cooling the reactor as a whole.

[0021] Secondly, the cooling water and the reaction liquid are introduced into adjacent heat exchanger plates respectively, so that the cooling water cools the adjacent reaction liquid, and the reaction liquid and the cooling water maintain a stable circulation flow, which achieves the cooling effect more quickly and effectively and greatly shortens the cooling time.

[0022] At the same time, the cooling water entering the heat exchanger and the reactor will circulate back to the cooler to cool down again and be recycled after the temperature gradually rises, ensuring that the temperature of the cooling water in the heat exchanger and the reactor is always balanced, thereby further improving the cooling efficiency and ensuring that the polycarboxylate water reducer is always in the required low temperature and constant temperature environment during the synthesis, thereby improving the synthesis efficiency.

[0023] Moreover, after adjusting the exchange rate of cooling water, the device can ensure the effective automatic circulation of the synthesis reaction, get rid of manual operation and reduce production input. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0025] Figure 1 It is a schematic diagram of the structure of the present invention;

[0026] Figure 2 It is a schematic diagram of the axonometric structure of the stirring device of the present invention. Specific implementation plan

[0027] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on only the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0028] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0029] like Figure 1 As shown, a low constant temperature synthesis reaction device of polycarboxylate water-reducing agent comprises a reactor 1, a cooler 2 and a heat exchanger 3. The top of the reactor 1 is provided with a feed port 11 and a plurality of addition ports 12, and the bottom is provided with a discharge port 13. The shell of the reactor 1 has an interlayer 14 inside, and the lower part of the interlayer 14 is connected to a cooling water inlet pipe 21, and the upper part is connected to a cooling water outlet pipe 22. The cooler 2 is connected to the other ends of the cooling water inlet pipe 21 and the cooling water outlet pipe 22.

[0030] The heat exchanger 3 includes a plurality of heat exchanger plates connected in parallel, and two adjacent heat exchanger plates are respectively connected to the reactor 1 and the cooler 2; wherein, the reactor 1 and the heat exchanger 3 are connected via a liquid inlet pipe 31 and a liquid outlet pipe 32, and the cooler 2 and the heat exchanger 3 are connected via a water inlet pipe 33 and a water outlet pipe 34. In addition, the cooling water inlet pipe 21, the cooling water outlet pipe 22, the liquid inlet pipe 31, the liquid outlet pipe 32, the water inlet pipe 33 and the water outlet pipe 34 are all connected via a circulating pump 4 and a stop valve 5.

[0031] Before the synthesis reaction, the main reactant is first added to the reactor 1 from the feed port 11, the device is started, the material liquid in the reactor 1 is cooled to the specified temperature, and then other small monomers and auxiliary material solutions are dripped into the reactor through several addition ports 12, and the reaction begins, and the reaction is an exothermic reaction. During the synthesis operation, the reaction liquid will enter the heat exchanger plate of the heat exchanger 3 through the liquid inlet pipe 31 and return to the reactor 1 through the liquid outlet pipe 32 to form a circulation flow. In contrast, the cooling water in the cooler 2 will enter the heat exchanger plate in parallel with the reaction liquid and adjacent to the heat exchanger 3 through the water inlet pipe 33. When the temperature of the cooling water in the heat exchanger plate increases, it returns to the cooler 2 through the water outlet pipe 34 to cool the cooling water so that it enters the heat exchanger 3 through the water inlet pipe 33 again for recycling.

[0032] At the same time, the cooling water will also enter the interlayer 14 of the shell of the reactor 1 through the cooling water inlet pipe 21 to cool the reactor 1. After the heat exchange, the cooling water gradually heated up returns to the cooler 2 through the cooling water outlet pipe 22 to cool down and then circulates again to complete the cooling of the shell of the reactor 1. During the synthesis and heat exchange process, the dripping amount and dripping time of various small monomers, catalysts, initiators, chain transfer agents, etc. are controlled. After the dripping is completed, the temperature is kept for a certain period of time, alkali is added for neutralization, and water is added for dilution to complete the synthesis reaction of the entire polycarboxylic acid water reducer. The synthesized polycarboxylic acid water reducer flows out through the discharge port 13 and enters the designated water reducer mother liquid storage tank.

[0033] The device adopts a new connection method, and realizes the dual cooling of the reactor 1 and the reaction liquid by means of parallel heat exchanger plates. First, the cooling water is passed into the shell interlayer 14 of the reactor 1 through the cooler 2, so as to cool the reactor 1 as a whole. Secondly, the cooling water and the reaction liquid are respectively introduced into the adjacent heat exchanger plates, so that the cooling water cools the adjacent reaction liquid, and the reaction liquid and the cooling water maintain a stable circulation flow, which is more quickly and effectively achieved The cooling effect, greatly shortening the cooling time. At the same time, the cooling water that enters the heat exchanger 3 and the reactor 1 will circulate back to the cooler 2 to cool down again and be recycled after the temperature gradually rises, ensuring that the cooling water temperature in the heat exchanger 3 and the reactor 1 is always balanced, thereby further improving the cooling efficiency, ensuring that the polycarboxylic acid water reducer is always in the required low temperature and constant temperature environment during the synthesis, and improving the synthesis efficiency. In addition, after adjusting the exchange rate of the cooling water, the device can ensure that the automatic cycle of the synthesis reaction is carried out effectively, getting rid of human operation and reducing production input.

[0034] like Figure 1-2 As shown, a stirring device 15 is also provided inside the reactor 1, and the stirring device 15 includes a stirring rod 151 horizontally mounted on the inner wall of the reactor 1. There are two stirring rods 151, and a plurality of stirring plates 152 are arranged around the side walls of the stirring rods 151 at intervals. The two stirring rods 151 are rotatably connected to the inner wall of the reactor 1, and one end thereof passes through the outer shell of the reactor 1 and is sleeved with a driving gear 153. A transmission gear 154 meshing with both driving gears 153 is fixed in the middle of the two driving gears 153, and the central axis of the transmission gear 154 is dynamically connected to a driving motor 150.

[0035] When in use, the stirring device 15 first drives the transmission gear 154 to rotate through the driving motor 150, so that the transmission gear 154 drives the two driving gears 153 meshing with it to rotate accordingly, and the driving gear 153 is fixedly sleeved on the stirring rod 151, so the stirring rod 151 rotates synchronously, and finally the stirring blade 152 with the stirring rod 151 as the axis rotates with the stirring rod 151 to stir the reaction liquid, thereby accelerating the synthesis of the reaction liquid and improving the reaction efficiency.

[0036] The stirring blades 152 used are of a right-angled trapezoidal structure, and the stirring blades 152 located on the two stirring rods 151 are arranged in opposite directions along the central axis of the stirring rod 151. Therefore, the linear speeds of the outer edges of each stirring blade 152 along the axial direction are different, but the superimposed speeds of the two groups of stirring blades 152 are consistent, thereby increasing the stirring rate as much as possible under the same rotational work, and preventing uneven stirring of the reaction liquid or pressure concentration in the reactor 1 due to excessive flow velocity at a certain point.

[0037] Furthermore, the stirring blade 152 is a grid-like structure rather than a plate-like structure, so that the reaction liquid can leak out in the grid holes, increasing the contact area between the stirring blade 152 and the reaction liquid, further enhancing the stirring work, improving the stirring efficiency, and not causing excessive pressure and resistance to the reaction liquid. It also effectively avoids the situation where the plate-like structure has too much driving force on the reaction liquid and is not flexible enough, causing the reaction liquid to be agitated and unevenly stirred. In addition, in production, the grid structure uses less material than the plate-like structure, which improves production efficiency and saves costs.

[0038] The upper part of the reactor 1 used in the device is a truncated cone structure with a bottom radius greater than the top radius, the middle part of the reactor 1 is a cylindrical structure that is buckled and connected with the upper part, and the lower part of the reactor 1 is a truncated cone structure with a top radius greater than the bottom radius that is buckled and connected with the middle part. The truncated cone structures of the upper and lower parts are more conducive to the circulation of the reaction solution, and the impact force is reduced when the raw materials are injected and output. The cylindrical structure in the middle part ensures the volume of the reactor 1. At this time, the stirring device 15 is set up in the middle part of the reactor 1, which ensures that the stirring area is as large as possible and the stirring effect is more balanced.

[0039] Cooler 2 uses a circulating water refrigerator. The refrigerator system is filled with a certain amount of refrigerant, and water is cooled down through repeated cycles of compression, condensation, throttling and evaporation in a closed system. Under the premise of meeting the use requirements of the device, the production needs of energy conservation are met.

[0040] In addition, the reactor 1 is also connected to a thermometer 6 to monitor the temperature of the reaction liquid in the reactor 1 in real time to ensure that it is always in a constant temperature and low temperature synthesis environment, which can be monitored intuitively by the staff and is more conducive to avoiding risks.

[0041] The above are only preferred embodiments of the present invention. Any simple modification, deformation and equivalent substitution made to the present invention by anyone based on the contents of the present invention shall fall within the protection scope of the present invention.

Claims

1. A low constant temperature synthesis reaction device for polycarboxylate water reducer, characterized in that: include: A reaction kettle (1), wherein the top of the reaction kettle (1) is provided with a feed port (11) and a plurality of addition ports (12), and the bottom is provided with a discharge port (13); the shell of the reaction kettle (1) has an interlayer (14) inside, the lower part of the interlayer (14) is connected to a cooling water inlet pipe (21), and the upper part is connected to a cooling water outlet pipe (22); A cooler (2), the cooler (2) being in communication with the other end of the cooling water inlet pipe (21) and the cooling water outlet pipe (22); A heat exchanger (3), the heat exchanger (3) comprising a plurality of heat exchanger plates connected in parallel, and two adjacent heat exchanger plates are respectively connected to the reactor (1) and the cooler (2); wherein a liquid inlet pipe (31) and a liquid outlet pipe (32) are connected between the reactor (1) and the heat exchanger (3), and a water inlet pipe (33) and a water outlet pipe (34) are connected between the cooler (2) and the heat exchanger (3); The cooling water inlet pipe (21), the cooling water outlet pipe (22), the liquid inlet pipe (31), the liquid outlet pipe (32), the water inlet pipe (33) and the water outlet pipe (34) are all connected to a circulation pump (4) and a stop valve (5); The interior of the reactor (1) is also connected to a stirring device (15), the stirring device (15) comprising a stirring rod (151) horizontally mounted on the inner wall of the reactor (1), the number of the stirring rods (151) being two, a plurality of stirring blades (152) being arranged around the side wall of the stirring rod (151) at intervals, the stirring rod (151) being rotatably connected to the inner wall of the reactor (1), one end of the stirring rod (151) passing through the outer shell of the reactor (1) and being sleeved with a driving gear (153), a transmission gear (154) meshing with both driving gears (153) being fixed between the two driving gears (153), the central axis of the transmission gear (154) being dynamically connected to a driving motor (150); The stirring blades (152) are of a right-angled trapezoidal structure, and the stirring blades (152) located on the two stirring rods (151) are arranged in opposite directions along the central axis of the stirring rods (151); The stirring blade (152) is a grid-like structure; The upper part of the reaction kettle (1) is a truncated cone-shaped structure with a bottom radius greater than a top radius, the middle part of the reaction kettle (1) is a cylindrical structure snap-fitted with the upper part, and the lower part of the reaction kettle (1) is a truncated cone-shaped structure with a top radius greater than a bottom radius.

2. A polycarboxylate water-reducing agent low constant temperature synthesis reaction device according to claim 1, characterized in that: The stirring rod (151) is mounted in the middle of the reaction kettle (1).

3. A polycarboxylate water-reducing agent low constant temperature synthesis reaction device according to claim 1, characterized in that: The cooler (2) is a circulating water refrigerator.

4. A polycarboxylate water-reducing agent low constant temperature synthesis reaction device according to claim 1, characterized in that: The reaction kettle (1) is also connected to a thermometer (6).

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