Purifying device for producing waterborne polyurethane adhesive

Abstract

The utility model relates to the technical field of waterborne polyurethane adhesive production, in particular to a purification device for waterborne polyurethane adhesive production, which comprises a resin tower, a low-pressure tower and a pressurizing tower which are mutually connected, a raw material feeding pump is used for inputting raw materials and is connected with a raw material preheater, and the raw material preheater is connected with the resin tower; the resin tower reboiler is arranged at the lower part of the resin tower; the resin tower condenser is arranged at the upper part of the resin tower; the side surface of the first split-phase tank is connected with a first butanone phase tank, and the first butanone phase tank is connected with a pressurizing tower; the bottom of the first split-phase tank is connected with a resin tower reflux pump; the resin tower reflux pump is simultaneously connected with the resin tower and the low-pressure tower, and controls materials to flow to the resin tower or the low-pressure tower through an electromagnetic valve. The purification device disclosed by the utility model can effectively remove water and butanone in raw materials and improve the purity of the raw materials, so that the quality and the performance of the waterborne polyurethane adhesive are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of waterborne polyurethane adhesive production, in particular to a purification device for waterborne polyurethane adhesive production. Background Technique

[0002] In the production process of waterborne polyurethane adhesive, methyl ethyl ketone (MEK) is used. By adding the organic solvent MEK, the viscosity of the waterborne polyurethane adhesive is controlled and it plays a solubilizing role. However, the residual organic solvent MEK in the product violates environmental protection requirements. Therefore, it is necessary to purify the raw materials of waterborne polyurethane adhesive to remove impurities such as water and MEK, so as to improve the quality and performance of the product.

[0003] Traditional purification methods have problems such as low efficiency and low purity. Therefore, an efficient and reliable purification device is needed to meet the production requirements. Content of the Utility Model

[0004] The purpose of the utility model is to provide a purification device for waterborne polyurethane adhesive production, which can effectively remove water and MEK in the raw materials, improve the purity of the raw materials, and thus improve the quality and performance of the waterborne polyurethane adhesive. Thereby solving the technical problems in the background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solution. A purification device for waterborne polyurethane adhesive production includes a resin tower, a low-pressure tower and a pressurized tower which are connected to each other. The resin tower includes a raw material feed pump, a raw material preheater, a resin tower reboiler, a resin tower condenser, a first phase separation tank, a resin tower reflux pump, and a first MEK phase tank. The raw material feed pump is used to input raw materials and is connected to the raw material preheater. The raw material preheater is connected to the resin tower. The resin tower reboiler is arranged at the lower part of the resin tower. The resin tower condenser is arranged at the upper part of the resin tower. One end of the resin tower condenser is connected to the upper part of the resin tower, and the other end is connected to the first phase separation tank. The side of the first phase separation tank is connected to the first MEK phase tank, and the first MEK phase tank is connected to the pressurized tower. The bottom of the first phase separation tank is connected to the resin tower reflux pump. The resin tower reflux pump is simultaneously connected to the resin tower and the low-pressure tower, and the material flow to the resin tower or to the low-pressure tower is controlled by a solenoid valve.

[0006] Further, the low-pressure tower includes a low-pressure tower preheater, a low-pressure tower reboiler, a low-pressure tower condenser, a second phase separation tank, a low-pressure tower reflux pump, and a second MEK phase tank. The low-pressure tower preheater is arranged between the low-pressure tower and the resin tower reflux pump. The low-pressure tower reboiler is arranged at the lower part of the low-pressure tower.

[0007] The low-pressure tower condenser is arranged at the upper part of the low-pressure tower; one end of the low-pressure tower condenser is connected to the upper part of the low-pressure tower and the other end is connected to the second phase separator; the side of the second phase separator is connected to the second methyl ethyl ketone phase tank, and the bottom of the second phase separator is connected to the low-pressure tower reflux pump; the low-pressure tower reflux pump is connected to the low-pressure tower; the second methyl ethyl ketone phase tank is connected to the pressurized tower reflux pump; the pressurized tower reflux pump is connected to the pressurized tower.

[0008] Further, the lower end of the low-pressure tower reboiler is successively connected with a waste water pump, a waste water cooler and a waste water buffer tank, and the waste water pump is connected to the waste water cooler; the waste water enters the waste water buffer tank after passing through the waste water cooler.

[0009] Further, the pressurized tower includes a pressurized tower feed pump, which is connected to the first phase separator, and the methyl ethyl ketone and water in the first phase separator will enter the pressurized tower;

[0010] The pressurized tower further includes a pressurized tower preheater, a pressurized tower reboiler, a pressurized tower condenser and a pressurized tower reflux pump; the pressurized tower preheater is arranged between the pressurized tower and the pressurized tower feed pump; the pressurized tower reboiler is arranged at the lower part of the pressurized tower;

[0011] The pressurized tower condenser is arranged at the upper part of the low-pressure tower; one end of the pressurized tower condenser is connected to the upper part of the low-pressure tower and the other end is connected to the second methyl ethyl ketone phase tank; a part of the purified methyl ethyl ketone in the materials entering the pressurized tower enters the methyl ethyl ketone recovery tank after passing through the methyl ethyl ketone cooler; another part flows back to the second methyl ethyl ketone phase tank through the pressurized tower condenser and then returns to the low-pressure tower for purification again.

[0012] Further, the lower end of the pressurized tower reboiler is successively connected with a methyl ethyl ketone pump, a methyl ethyl ketone cooler and a methyl ethyl ketone recovery tank, and the methyl ethyl ketone pump is connected to the methyl ethyl ketone cooler; the methyl ethyl ketone enters the methyl ethyl ketone recovery tank for recovery after passing through the methyl ethyl ketone cooler.

[0013] Beneficial effects

[0014] The purification device of the present utility model can effectively remove water and methyl ethyl ketone in the raw materials, improve the purity of the raw materials, and thus improve the quality and performance of the water-based polyurethane adhesive.

[0015] Through the synergistic effect of the resin tower, the low-pressure tower and the pressurized tower, the present utility model realizes the efficient purification of the raw materials and improves the production efficiency. Description of the drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings.

[0017] Figure 1 is a schematic structural diagram of the resin tower of the present utility model;

[0018] Figure 2 is a schematic structural diagram of the low-pressure tower of the present utility model;

[0019] Figure 3 is a schematic structural diagram of the pressurized tower of the present utility model.

[0020] Figure 4 is a schematic overall structural diagram of the purification device for the production of aqueous polyurethane adhesive of the present utility model;

[0021] In the figure:

[0022] 1. Resin tower, 2. Low-pressure tower, 3. Pressurized tower, 4. Raw material feed pump, 5. Raw material preheater, 6. Resin tower reboiler, 7. Resin tower condenser, 8. First phase separation tank, 9. Resin tower reflux pump, 10. First methyl ethyl ketone phase tank, 11. Low-pressure tower preheater, 12. Low-pressure tower reboiler, 13. Low-pressure tower condenser, 14. Second phase separation tank, 15. Low-pressure tower reflux pump, 16. Second methyl ethyl ketone phase tank, 17. Wastewater pump, 18. Wastewater cooler, 19. Pressurized tower feed pump, 20. Pressurized tower preheater, 21. Pressurized tower reboiler, 22. Pressurized tower condenser, 23. Pressurized tower reflux pump, 24. Methyl ethyl ketone pump, 25. Methyl ethyl ketone cooler. Specific embodiments

[0023] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0024] To achieve the above object, the present utility model provides the following technical solutions, as Figures 1-4As shown in the figure, it includes a resin tower 1, a low-pressure tower 2, and a pressurized tower 3; the raw material is resin with water and methyl ethyl ketone, and the raw material needs to be purified to remove a part of water and methyl ethyl ketone; the raw material first enters the resin tower 1, is heated by the resin tower reboiler, and is separated in the resin tower 1. Water and methyl ethyl ketone evaporate upward to become gas phase and reach the top of the resin tower 1; the gas-phase water and methyl ethyl ketone are cooled at low temperature by the resin tower condenser behind, and the cooled condensate enters the first phase separation tank 8; the water and methyl ethyl ketone in the first phase separation tank 8 are further separated, and the separated higher-purity methyl ethyl ketone enters the first methyl ethyl ketone phase tank 10 and is input into the pressurized tower 3 for purification through the pressurized tower feed pump 19. The purified high-purity methyl ethyl ketone is collected in the methyl ethyl ketone recovery tank; the remaining water and methyl ethyl ketone enter the low-pressure tower 2 through the resin tower reflux pump 9 to remove water and further extract methyl ethyl ketone; the butanol extracted from the low-pressure tower 2 enters the pressurized tower 3 through the pressurized tower reflux pump 23 for dehydration and purification treatment, and finally will also be collected in the methyl ethyl ketone recovery tank. The resin in the resin tower 1 reaches the lower part of the resin tower 1, passes through the resin output pump, and is discharged to the resin buffer tank for storage after passing through the resin cooler;

[0025] Generally, after the raw material passes through the resin tower 1, the resin will be recovered, the separated higher-purity methyl ethyl ketone will directly enter the pressurized tower 3 for purification and be collected in the methyl ethyl ketone recovery tank, and the separated lower-purity methyl ethyl ketone will first enter the low-pressure tower 2 for purification and the separated waste water will be discharged; then the purified methyl ethyl ketone enters the pressurized tower 3 for secondary purification, and finally the methyl ethyl ketone after secondary purification is also collected in the methyl ethyl ketone recovery tank. Thus, the removal of water and methyl ethyl ketone in the raw material is completed, and the raw material is purified.

[0026] The resin tower 1 includes a raw material feed pump 4, a raw material preheater 5, a resin tower reboiler 6, a resin tower condenser 7, a first phase separation tank 8, a resin tower reflux pump 9, and a first methyl ethyl ketone phase tank 10; the raw material feed pump 4 is used to input the raw material and is connected to the raw material preheater 5. The raw material enters the resin tower 1 after being preheated by the raw material preheater 5; the resin tower reboiler 6 is arranged at the lower part of the resin tower 1; the resin tower condenser 7 is arranged at the upper part of the resin tower 1; one end of the resin tower condenser 7 is connected to the upper part of the resin tower 1 and the other end is connected to the first phase separation tank 8; the side of the first phase separation tank 8 is connected to the first methyl ethyl ketone phase tank 10, and the first methyl ethyl ketone phase tank 10 is connected to the pressurized tower feed pump 19; the pressurized tower feed pump 19 is connected to the pressurized tower 3; the bottom of the first phase separation tank 8 is connected to the resin tower reflux pump 9; the resin tower reflux pump 9 is simultaneously connected to the resin tower 1 and the low-pressure tower 2, and the material flow to the resin tower 1 or to the low-pressure tower 2 is controlled by a solenoid valve;

[0027] After the first phase separation tank 8 separates water and methyl ethyl ketone, a part of the methyl ethyl ketone is stored in the first methyl ethyl ketone phase tank 10, and the remaining water and methyl ethyl ketone are refluxed to the resin tower 1 or flow into the low-pressure tower 2 through the resin tower reflux pump 9;

[0028] A resin output pump is connected to the lower end of the resin column reboiler 6, and after passing through the cooler, it is discharged to the resin buffer tank for storage;

[0029] The low-pressure column 2 includes a low-pressure column preheater 11, a low-pressure column reboiler 12, a low-pressure column condenser 13, a second phase separation tank 14, a low-pressure column reflux pump 15, and a second methyl ethyl ketone phase tank 16; the low-pressure column preheater 11 is arranged between the low-pressure column 2 and the resin column reflux pump 9; the low-pressure column reboiler 12 is arranged at the lower part of the low-pressure column 2, and a wastewater pump 17 is connected to the lower end of the low-pressure column reboiler 12, and the wastewater pump 17 is connected to the wastewater cooler 18; after passing through the wastewater cooler 18, it enters the wastewater buffer tank for storage;

[0030] The low-pressure column condenser 12 is arranged at the upper part of the low-pressure column 2; one end of the low-pressure column condenser 13 is connected to the upper part of the low-pressure column 2 and the other end is connected to the second phase separation tank 14; the side of the second phase separation tank 14 is connected to the second methyl ethyl ketone phase tank 16, and the bottom of the second phase separation tank 14 is connected to the low-pressure column reflux pump 15; the low-pressure column reflux pump 15 is connected to the low-pressure column 2; the second methyl ethyl ketone phase tank 16 is connected to the pressurized column reflux pump 23; the pressurized column reflux pump 23 is connected to the pressurized column 3;

[0031] The pressurized column 3 includes a pressurized column feed pump 19, and the pressurized column feed pump 19 is connected to the first phase separation tank 8, and the methyl ethyl ketone and water in the first phase separation tank 8 will enter the pressurized column 3;

[0032] The pressurized column 3 further includes a pressurized column preheater 20, a pressurized column reboiler 21, a pressurized column condenser 22, and a pressurized column reflux pump 23; the pressurized column preheater 20 is arranged between the pressurized column 3 and the pressurized column feed pump 19; the pressurized column reboiler 21 is arranged at the lower part of the pressurized column 3, and a methyl ethyl ketone pump 24 is connected to the lower end of the pressurized column reboiler 21, and the methyl ethyl ketone pump 24 is connected to the methyl ethyl ketone cooler 25; the methyl ethyl ketone enters the methyl ethyl ketone recovery tank after being cooled by the methyl ethyl ketone cooler 25;

[0033] The pressurized column condenser 22 is arranged at the upper part of the low-pressure column 2; one end of the pressurized column condenser 22 is connected to the upper part of the low-pressure column 2 and the other end is connected to the second methyl ethyl ketone phase tank 16; a part of the purified methyl ethyl ketone of the materials entering the pressurized column 3 enters the methyl ethyl ketone recovery tank after passing through the methyl ethyl ketone cooler 25; the other part returns to the second methyl ethyl ketone phase tank 16 through the pressurized column condenser 22 and then returns to the low-pressure column 2 for purification again;

[0034] The working principle and process are as follows:

[0035] The raw materials are input through the raw material feed pump 4 and enter the resin column 1 after being preheated by the raw material preheater 5.

[0036] In the resin tower 1, the raw material is heated by the resin tower reboiler 6 and then separated. Water and methyl ethyl ketone turn into gas phase and reach the top of the resin tower 1. The gas phase is cooled by the resin tower condenser 7 to form condensate and enters the first phase separation tank 8.

[0037] The water and methyl ethyl ketone in the first phase separation tank 8 are further separated. High-purity methyl ethyl ketone enters the first methyl ethyl ketone phase tank 10 and is then input into the pressurizing tower 3 for purification through the pressurizing tower feed pump 19. The remaining water and methyl ethyl ketone flow to the resin tower 1 or into the low-pressure tower 2 according to the control of the solenoid valve through the resin tower reflux pump 9.

[0038] The material entering the low-pressure tower 2 is preheated by the low-pressure tower preheater 11 and then further purified in the low-pressure tower 2. The wastewater enters the wastewater buffer tank after passing through the wastewater pump 17 and the wastewater cooler 18.

[0039] The methyl ethyl ketone extracted from the low-pressure tower 2 is cooled by the low-pressure tower condenser 13 and then enters the second phase separation tank 14. The separated methyl ethyl ketone enters the second methyl ethyl ketone phase tank 16 and enters the pressurizing tower 3 through the pressurizing tower reflux pump 23.

[0040] The methyl ethyl ketone and water entering the pressurizing tower 3 pass through the pressurizing tower feed pump 19 and the pressurizing tower preheater 20 and are then purified in the pressurizing tower 3. The purified methyl ethyl ketone enters the methyl ethyl ketone recovery tank after passing through the methyl ethyl ketone pump 24 and the methyl ethyl ketone cooler 25. Part of the methyl ethyl ketone is refluxed to the second methyl ethyl ketone phase tank 16 through the pressurizing tower condenser 22 and then returns to the low-pressure tower 2 for further purification.

[0041] Through the above working principle and usage process, the device completes the removal of water and methyl ethyl ketone in the raw material and realizes the purification of the raw material.

[0042] The embodiments of the present utility model are given for purposes of illustration and description, and are not exhaustive or limit the present utility model to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present utility model, and enable those of ordinary skill in the art to understand the present utility model and thus design various embodiments with various modifications suitable for specific purposes.

Claims

1. A purification device for the production of aqueous polyurethane adhesives, comprising a resin tower (1), a low-pressure tower (2) and a pressurized tower (3) connected to each other, characterized in that: The resin tower includes a raw material feed pump (4), a raw material preheater (5), a resin tower reboiler (6), a resin tower condenser (7), a first phase separation tank (8), a resin tower reflux pump (9) and a first methyl ethyl ketone phase tank (10); the raw material feed pump (4) is used to input raw materials and is connected to the raw material preheater (5), and the raw material preheater (5) is connected to the resin tower (1); the resin tower reboiler (6) is arranged at the lower part of the resin tower (1); the resin tower condenser (7) is arranged at the upper part of the resin tower (1); one end of the resin tower condenser (7) is connected to the upper part of the resin tower (1), and the other end is connected to the first phase separation tank (8); the side of the first phase separation tank (8) is connected to the first methyl ethyl ketone phase tank (10), and the first methyl ethyl ketone phase tank (10) is connected to the pressurized tower (3); the bottom of the first phase separation tank (8) is connected to the resin tower reflux pump (9); the resin tower reflux pump (9) is simultaneously connected to the resin tower (1) and the low-pressure tower (2).

2. The purification device for the production of the aqueous polyurethane adhesive according to claim 1, wherein The low-pressure tower (2) includes a low-pressure tower preheater (11), a low-pressure tower reboiler (12), a low-pressure tower condenser (13), a second phase separation tank (14), a low-pressure tower reflux pump (15) and a second methyl ethyl ketone phase tank (16); the low-pressure tower preheater (11) is arranged between the low-pressure tower (2) and the resin tower reflux pump (9); the low-pressure tower reboiler (12) is arranged at the lower part of the low-pressure tower (2); The low-pressure tower condenser (13) is arranged at the upper part of the low-pressure tower (2); one end of the low-pressure tower condenser (13) is connected to the upper part of the low-pressure tower (2), and the other end is connected to the second phase separation tank (14); the side of the second phase separation tank (14) is connected to the second methyl ethyl ketone phase tank (16), and the bottom of the second phase separation tank (14) is connected to the low-pressure tower reflux pump (15); the low-pressure tower reflux pump (15) is connected to the low-pressure tower (2); the second methyl ethyl ketone phase tank (16) is connected to the pressurized tower reflux pump (23); the pressurized tower reflux pump (23) is connected to the pressurized tower (3).

3. The purification device for producing the aqueous polyurethane adhesive according to claim 2, characterized in that, The lower end of the low-pressure tower reboiler (12) is sequentially connected to a waste water pump (17), a waste water cooler (18) and a waste water buffer tank, and the waste water pump (17) is connected to the waste water cooler (18); the waste water enters the waste water buffer tank after passing through the waste water cooler (18).

4. The purification device for the production of the aqueous polyurethane adhesive according to claim 1, characterized in that, The pressurized tower (3) includes a pressurized tower feed pump (19), and the pressurized tower feed pump (19) is connected to the first phase separation tank (8), and the methyl ethyl ketone and water in the first phase separation tank (8) will enter the pressurized tower (3); The pressurized tower (3) further includes a pressurized tower preheater (20), a pressurized tower reboiler (21), a pressurized tower condenser (22) and a pressurized tower reflux pump (23); the pressurized tower preheater (20) is arranged between the pressurized tower (3) and the pressurized tower feed pump (19); the pressurized tower reboiler (21) is arranged at the lower part of the pressurized tower (3); The pressurized tower condenser (22) is arranged at the upper part of the low-pressure tower (2); one end of the pressurized tower condenser (22) is connected to the upper part of the low-pressure tower (2), and the other end is connected to the second methyl ethyl ketone phase tank (16); a part of the purified methyl ethyl ketone among the materials entering the pressurized tower (3) enters the methyl ethyl ketone recovery tank after passing through the methyl ethyl ketone cooler (25); another part flows back to the second methyl ethyl ketone phase tank (16) through the pressurized tower condenser (22) and then returns to the low-pressure tower (2) again for purification.

5. The purification device for the production of the aqueous polyurethane adhesive according to claim 4, wherein The lower end of the pressurized tower reboiler (21) is successively connected with a methyl ethyl ketone pump (24), a methyl ethyl ketone cooler (25) and a methyl ethyl ketone recovery tank, and the methyl ethyl ketone pump (24) is connected to the methyl ethyl ketone cooler (25); the methyl ethyl ketone enters the methyl ethyl ketone recovery tank for recovery after passing through the methyl ethyl ketone cooler (25).

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