Ammoximation wastewater deamination device

Abstract

The utility model discloses an ammoximation wastewater deamination device, and belongs to the field of chemical equipment. The deamination device comprises an ammonia desorption tower, and the bottom of the ammonia desorption tower is connected with a discharge pump of the ammonia desorption tower through a pipeline; the top of the ammonia desorption tower is connected with an ammonia desorption tower 1 # condenser through a pipeline, the ammonia desorption tower 1 # condenser is connected with an ammonia water buffer tank through a pipeline, and the ammonia water buffer tank is connected with an ammonia water delivery pump through a pipeline; the ammonia desorption tower 1 # condenser is connected with the ammonia desorption tower 2 # condenser through a pipeline, and the ammonia desorption tower 2 # condenser is connected with the ammonia water buffer tank through a pipeline; and the ammonia water delivery pump is connected with the second condenser of the ammonia desorption tower through a pipeline, and the joint is connected through a spray head. The device has the advantages that the problem that the non-condensable gas contains ammonia is solved, and the ammonia can be reused, so that the utilization rate of the ammonia is improved, and the production cost is reduced.

Description

Technical Field

[0001] This utility model relates to an ammonia removal device for ammonia oxime wastewater, belonging to the field of chemical equipment. Background Technology

[0002] Ammoniation is a key step in the caprolactam process. It involves the reaction of ammonia, cyclohexanone, and hydrogen peroxide in a solvent under the action of a catalyst to generate cyclohexanone oxime. The generated cyclohexanone oxime is then extracted by solvent and enters the next process. The ammonia-containing wastewater undergoes deammoniation before entering the wastewater treatment process.

[0003] Currently, the common methods for removing ammonia from ammonia-containing wastewater include atmospheric / negative pressure ammonia removal. The ammonia-containing wastewater is heated in an ammonia stripping tower. The mixture of ammonia and water vapor coming out of the top of the ammonia stripping tower is condensed to form ammonia water for reuse. Non-condensable gas is directly discharged, and the wastewater at the bottom of the stripping tower enters the wastewater treatment plant. This often results in the site being filled with the smell of ammonia because the non-condensable gas also contains ammonia. Summary of the Invention

[0004] To address the aforementioned shortcomings, this invention provides an ammonia removal device for ammonia oxime wastewater. This device is suitable for caprolactam production facilities. This invention solves the problem of ammonia content in non-condensable gases, and this portion of ammonia can be reused, thereby improving the utilization rate of ammonia and reducing production costs.

[0005] The technical solution of this utility model is as follows: an ammonia removal device for ammonia oxime wastewater includes an ammonia stripping tower, the bottom of which is connected to an ammonia stripping tower discharge pump via a pipeline;

[0006] The top of the ammonia stripping tower is connected to the No. 1 condenser of the ammonia stripping tower via a pipeline. The No. 1 condenser of the ammonia stripping tower is connected to the ammonia water buffer tank via a pipeline. The ammonia water buffer tank is connected to the ammonia water delivery pump via a pipeline.

[0007] The condenser of ammonia stripping tower #1 is connected to the condenser of ammonia stripping tower #2 via a pipeline, and the condenser of ammonia stripping tower #2 is connected to the ammonia water buffer tank via a pipeline.

[0008] The ammonia water delivery pump is connected to the ammonia desorption tower No. 2 condenser via a pipeline, and a nozzle is used for connection at the joint.

[0009] Furthermore, the condenser of the ammonia stripping tower #2 is connected to the ammonia absorption tower via a pipeline, the ammonia absorption tower is connected to the ammonia absorption tower circulating discharge pump via a pipeline, the ammonia absorption tower circulating discharge pump is connected to the ammonia absorption tower circulating cooler via a pipeline, and the ammonia absorption tower circulating cooler returns to the ammonia absorption tower via a pipeline.

[0010] To elaborate further, the demineralized / ammonium sulfate process water is connected to the ammonia absorption tower feed cooler via pipeline, and the ammonia absorption tower feed cooler is connected to the ammonia absorption tower via pipeline.

[0011] To elaborate further, the refrigerant used in the ammonia absorption tower circulating cooler is chilled water.

[0012] To elaborate further, the refrigerant used in the ammonia absorption tower feed cooler is chilled water.

[0013] Furthermore, the ammonia absorption tower is equipped with a distributor and spray pipes.

[0014] The ammonia removal device for ammonia oxime wastewater provided by this utility model has the following advantages:

[0015] 1. It can reabsorb ammonia in the non-condensable gas of the ammonia stripping tower, reducing VOC emissions and showing significant environmental advantages;

[0016] 2. The absorbed ammonia can be reused, reducing ammonia consumption and production costs;

[0017] 3. The ammonia water transfer pump is connected to the No. 2 condenser of the ammonia desorption tower via pipeline. A nozzle is used at the joint. Compared with not using a nozzle at the joint, the ammonia absorption rate is higher than 2%. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a wastewater ammonia removal and separation device.

[0019] Figure 2 for Figure 1 Enlarged view of A (Ammonia water transfer pump connected to ammonia desorption tower No. 2 condenser via pipeline, with a nozzle connection at the joint).

[0020] As shown in the figure, 1. Ammonia stripping tower, 2. Wastewater transfer pump, 3. Ammonia stripping tower 1# condenser, 4. Ammonia water buffer tank, 5. Ammonia water transfer pump, 6. Ammonia stripping tower 2# condenser, 7. Ammonia absorption tower, 8. Ammonia absorption tower circulating discharge pump, 9. Ammonia absorption tower circulating cooler, 10. Ammonia absorption tower feed cooler. Detailed Implementation

[0021] like Figure 1 In this invention, an ammonia removal device for ammonia oxime wastewater is described. Ammonia-containing wastewater is fed to the top of an ammonia stripping tower. Steam is directly introduced from the bottom of the tower for heating, controlling the temperature within a specific range. Ammonia and water exiting the top of the tower are condensed in condenser #1 and then enter an ammonia buffer tank. The non-condensable portion enters condenser #2. A spray absorption device is used on the inlet and outlet pipelines of condenser #2. The absorbent comes from the ammonia buffer tank and is pumped. The condensed ammonia water from condenser #2 returns to the buffer tank. Non-condensable gases from condenser #2 enter the lower part of the ammonia absorption tower. The material at the bottom of the tower enters the circulating discharge pump. Part of the material from the pump is supplied to other units, while the other part enters the circulating cooler and returns to the tower. Demineralized water / ammonium sulfate process water enters the ammonia absorption tower after passing through the feed cooler.

[0022] The bottom of ammonia stripping tower 1 is connected to ammonia stripping tower discharge pump 2 via a pipeline.

[0023] The top of ammonia stripping tower 1 is connected to condenser 3 of ammonia stripping tower 1 via a pipeline.

[0024] It is connected to the ammonia buffer tank 4 via pipeline, and the ammonia buffer tank 4 is connected to the ammonia delivery pump 5 via pipeline.

[0025] The condenser 3 of ammonia stripping tower 1 is connected to the condenser 6 of ammonia stripping tower 2 via a pipeline, and the condenser 6 of ammonia stripping tower 2 is connected to the ammonia water buffer tank 4 via a pipeline.

[0026] Ammonia water transfer pump 5 is connected to condenser 6 of ammonia desorption tower 2 via pipeline, and a nozzle (such as...) is used at the joint. Figure 2 As shown in the figure, it can significantly improve the absorption of ammonia.

[0027] The condenser 6 of the ammonia stripping tower 2 is connected to the ammonia absorption tower 7 via pipeline. The ammonia absorption tower 7 is connected to the ammonia absorption tower circulating discharge pump 8 via pipeline. The ammonia absorption tower circulating discharge pump 8 is connected to the ammonia absorption tower circulating cooler 9 via pipeline. The ammonia absorption tower circulating cooler 9 returns to the ammonia absorption tower 7 via pipeline.

[0028] The absorbent is connected to the ammonia absorption tower feed cooler 10 via a pipeline, and the ammonia absorption tower feed cooler 10 is connected to the ammonia absorption tower 7 via a pipeline.

[0029] The ammonia absorption tower circulating cooler 9 uses chilled water as the refrigerant, which can improve the absorption efficiency of ammonia.

[0030] The ammonia absorption tower feed cooler 10 uses chilled water as the refrigerant, which can improve the absorption efficiency of ammonia.

[0031] The ammonia absorption tower 7 is equipped with a distributor and spray pipes to further enhance the absorption of ammonia.

[0032] The various devices are connected by pipelines, and each pipeline is equipped with a control valve.

Claims

1. An ammonia removal device for ammonia oxime wastewater, characterized in that: The ammonia removal device includes an ammonia stripping tower, the bottom of which is connected to the ammonia stripping tower discharge pump (2) via a pipeline; The top of the ammonia stripping tower (1) is connected to the ammonia stripping tower 1# condenser (3) via a pipeline. The ammonia stripping tower 1# condenser (3) is connected to the ammonia water buffer tank (4) via a pipeline. The ammonia water buffer tank (4) is connected to the ammonia water delivery pump (5) via a pipeline. The ammonia desorption tower 1# condenser (3) is connected to the ammonia desorption tower 2# condenser (6) via a pipeline, and the ammonia desorption tower 2# condenser (6) is connected to the ammonia water buffer tank (4) via a pipeline; The ammonia water delivery pump (5) is connected to the ammonia desorption tower 2# condenser (6) via a pipeline, and a nozzle is used for connection at the joint.

2. The ammonia removal device for ammonia oxime wastewater according to claim 1, characterized in that: The ammonia stripping tower 2# condenser (6) is connected to the ammonia absorption tower (7) via a pipeline. The ammonia absorption tower (7) is connected to the ammonia absorption tower circulating discharge pump (8) via a pipeline. The ammonia absorption tower circulating discharge pump (8) is connected to the ammonia absorption tower circulating cooler (9) via a pipeline. The ammonia absorption tower circulating cooler (9) returns to the ammonia absorption tower (7) via a pipeline.

3. The ammonia removal device for ammonia oxime wastewater according to claim 1, characterized in that: It also includes demineralized water / ammonium sulfate process water via pipeline, which is connected to the ammonia absorption tower feed cooler (10) via pipeline, and the ammonia absorption tower feed cooler (10) is connected to the ammonia absorption tower (7) via pipeline.

4. The ammonia removal device for ammonia oxime wastewater according to claim 2, characterized in that: The refrigerant used in the ammonia absorption tower circulating cooler (9) is chilled water.

5. The ammonia removal device for ammonia oxime wastewater according to claim 3, characterized in that: The cooling medium for the ammonia absorption tower feed cooler (10) is chilled water.

6. The ammonia removal device for ammonia oxime wastewater according to claim 2, characterized in that: The ammonia absorption tower (7) is equipped with a distributor and spray pipes.

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