Treatment system for acrolein production wastewater

Abstract

The utility model discloses an acrolein production wastewater treatment system which comprises a reaction kettle, the top and the bottom of the reaction kettle are respectively communicated with the bottom and the top of an extraction and recovery integrated tank, and the extraction and recovery integrated tank is provided with an extraction agent inlet, an extraction agent recovery port and an extraction agent liquid outlet. The extracting agent recycling opening is communicated with the extracting agent liquid outlet through a circulating pipeline, and a waste water recycling box communicated with the waste outlet is arranged at the bottom of the extracting and recycling integrated tank. The extraction agent and the production wastewater are uniformly mixed, and the treatment efficiency and the treatment effect are improved; the recycling of the extraction agent is realized, and the treatment cost of the acrolein production wastewater is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of acrolein production and processing, in particular to a system for treating acrolein production wastewater. Background Art

[0002] Acrolein is produced by catalytically oxidizing propylene through a mixture of air and water vapor. This production process generates large amounts of waste gas and wastewater containing organic matter, which must be treated before discharge. These wastes primarily include a mixture of gases containing primarily acrolein, acetaldehyde, and air; and wastewater containing primarily acrylic acid, acrolein, and acetic acid. Currently, all waste is directly transported to a sewage treatment pool for purification. However, this mixing results in a more complex composition and stronger acidity, making it difficult to meet emission standards after treatment. The oxygen equivalent of organic matter is around 50,000, resulting in high treatment costs, significantly increasing the production cost of acrolein and reducing wastewater treatment effectiveness. Utility Model Content

[0003] The purpose of the utility model is to provide a treatment system for acrolein production wastewater, which mainly solves the problems existing in the prior art by setting up an integrated extraction and separation tank, so that the wastewater is mixed with the extractant under heating conditions to achieve rapid extraction, and the extractant is recycled under low temperature conditions.

[0004] In order to solve the above technical problems, the present invention adopts the following solutions:

[0005] A system for treating acrolein production wastewater comprises a reactor, wherein the top and bottom of the reactor are respectively connected to the bottom and top of an extraction and recovery integrated tank; the extraction and recovery integrated tank is provided with an extractant inlet, an extractant recovery port and an extractant liquid discharge port; the extractant recovery port and the extractant liquid discharge port are connected through a circulation pipeline; and a wastewater recovery tank connected to the waste discharge port is provided at the bottom of the extraction and recovery integrated tank.

[0006] Furthermore, a liquid inlet is provided on the top of the extraction and recovery integrated tank, and the liquid inlet is connected to the bottom of the reactor through a liquid inlet pipeline. The end of the liquid inlet located inside the extraction and separation integrated tank is provided with a connected annular guide plate, and the bottom of the guide plate is provided with multiple nozzles.

[0007] Furthermore, a heating resistance wire is provided inside the annular guide plate.

[0008] Furthermore, the outer wall of the extraction and recovery integrated tank is provided with a cooling cavity with a water inlet and a water outlet, and a plurality of condensing pipes are provided in the cooling cavity.

[0009] Furthermore, a rotating shaft is provided at the bottom of the extraction and recovery integrated tank, a stirring rod is provided on the outer peripheral surface of the rotating shaft, and the rotating shaft is also provided with a scraper in contact with the extraction and recovery integrated tank. The scraper is U-shaped, and the two horizontal parts of the scraper are respectively connected to the top and bottom of the rotating shaft.

[0010] Furthermore, a bearing is provided at the contact point between the rotating shaft and the extraction and recovery integrated tank, and the bottom end of the rotating shaft is connected to the output end of the driving motor.

[0011] Furthermore, support rods are symmetrically provided at both ends of the annular guide plate and connected to the inner wall of the extraction and recovery integrated tank.

[0012] Furthermore, a thermometer is provided on the top of the extraction and recovery integrated tank.

[0013] The utility model has the beneficial effects:

[0014] The utility model realizes uniform mixing of the extractant and production wastewater by arranging an annular guide plate, a nozzle, a stirring rod connected to the rotating shaft, and the rotating shaft, thereby improving the treatment efficiency and treatment effect; and by arranging a condensation tank located in the cooling chamber, the temperature inside the extraction and recovery integrated tank is reduced, and the wastewater and the extractant are separated and then enter the extractant recovery port through the circulation pipeline for re-extraction, thereby realizing the recycling of the extractant and reducing the treatment cost of acrolein production wastewater. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of the utility model;

[0016] Figure 2 It is a schematic cross-sectional view of the annular guide plate of the utility model.

[0017] Figure numerals: 1-reactor, 10-liquid inlet pipeline, 2-extraction and recovery integrated tank, 21-extraction agent recovery port, 22-extraction agent inlet, 23-liquid inlet, 24-annular guide plate, 240-heating resistance wire, 241-nozzle, 242-support rod, 25-circulation pipeline, 250-boosting pump, 26-rotating shaft, 260-drive motor, 261-stirring rod, 262-scraper, 263-bearing, 27-cooling chamber, 270-water inlet, 271-drain outlet, 272-condenser, 28-waste outlet, 29-extraction agent discharge port, 3-wastewater recovery tank, 4-thermometer. DETAILED DESCRIPTION

[0018] The present invention will be further described in detail below in conjunction with the embodiments and drawings, but the implementation manner of the present invention is not limited thereto.

[0019] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inside", "outside", "front", "back", "top", "bottom", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0020] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "opened," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0021] Example 1

[0022] Embodiment 1 of the present utility model is a system for treating acrolein production wastewater, comprising a reactor 1, the top and bottom of the reactor 1 being respectively connected to the bottom and top of an extraction and recovery integrated tank 2, the extraction and recovery integrated tank 2 being provided with an extractant inlet 22, an extractant recovery port 21 and an extractant discharge port 29, the extractant recovery port 21 being connected to the extractant discharge port 29 via a circulation pipeline 25, and the bottom of the extraction and recovery integrated tank 2 being provided with a wastewater recovery tank 3 connected to a waste discharge port 28.

[0023] Reference Figure 1 The utility model mainly connects the extraction and recovery integrated tank 2 with the reactor 1, and at the same time, a waste outlet 28 is provided at the bottom thereof to connect with the wastewater recovery tank 3, so that the wastewater after extraction is collected. An extractant inlet 22, an extractant recovery port 21 and an extractant liquid discharge port 29 are provided in the extraction and recovery integrated tank 2. The extractant enters the tank body through the extractant inlet 22 and mixes with the wastewater generated in the acrolein production process, so that the wastewater is evenly extracted. After the organic components in the wastewater are extracted, the wastewater is discharged, and the extracted extractant enters the top of the extraction and recovery integrated tank 2 through the extractant liquid discharge port 29 and the circulation pipeline 25, thereby realizing the reuse of the extractant and reducing the production cost of acrolein.

[0024] The extractant used in the present invention is isopropyl acetate, which can extract organic matter from wastewater. Because its density is lower than that of water, it floats on the water surface to form a layer. Then, the extraction and recovery integrated tank 2 is cooled to below 10°C, so that acrylic acid and acetic acid solidify and are separated from the extractant. The separated extractant is returned to the extraction and recovery integrated tank 2 through the circulation pipeline 25 for recycling.

[0025] In some preferred embodiments, the top of the integrated extraction and recovery tank 2 is provided with a liquid inlet 23, which is connected to the bottom of the reactor 1 via a liquid inlet pipeline 10. An annular guide plate 24 is provided at the end of the liquid inlet 23 located inside the integrated extraction and separation tank. The bottom of the guide plate is provided with multiple nozzles 241. A heating resistor 240 is provided inside the annular guide plate 24.

[0026] Specifically, refer to Figure 1 and Figure 2 The liquid inlet pipe 10 transports the wastewater to the top of the extraction and recovery integrated tank 2, where it enters the annular guide plate 24 and is sprayed from the nozzle 241 into the interior of the extraction and recovery integrated tank 2. During the spraying process, the heating resistor 240 provided within the annular guide plate 24 heats the wastewater passing through the annular guide plate 24, thereby volatilizing the low-boiling-point substances in the wastewater, improving the subsequent mixing of organic matter in the wastewater with the extractant and enhancing the extraction efficiency.

[0027] In some preferred embodiments, the outer wall of the extraction and recovery integrated tank 2 is provided with a cooling cavity 27 with a water inlet 270 and a water outlet 271 , and a plurality of condensing pipes 272 are provided in the cooling cavity 27 .

[0028] The cooling chamber 27 and the condenser 272 are provided mainly for solidifying acrylic acid and acetic acid, so that the extractant is taken out from the extractant discharge port 29 through the circulation pipeline 25 and the extractant recovery for secondary extraction and utilization, thereby realizing the recycling of the extractant, and after the production wastewater is thoroughly treated, it is transferred to the wastewater recovery tank 3 for collection.

[0029] In some preferred embodiments, a rotating shaft 26 is provided at the bottom of the integrated extraction and recovery tank 2. A stirring rod 261 is provided on the outer circumference of the rotating shaft 26. The rotating shaft 26 is also provided with a scraper 262 that contacts the integrated extraction and recovery tank 2. The scraper 262 is U-shaped, and its two horizontal portions are respectively connected to the top and bottom of the rotating shaft 26. A bearing 263 is provided at the contact point between the rotating shaft 26 and the integrated extraction and recovery tank 2. The bottom end of the rotating shaft 26 is connected to the output end of the drive motor 260.

[0030] Specifically, a stirring rod 261 and a scraper 262 connected to a rotating shaft 26 are provided within the integrated extraction and recovery tank 2 to uniformly mix the production wastewater and the extractant, thereby improving extraction efficiency. During the stirring process, the scraper 262 scrapes the inner wall of the integrated extraction and recovery tank 2, removing any adhering wastewater and extractant mixture, ensuring thorough extraction of the production wastewater. The rotating shaft 26 is primarily controlled by a drive motor 260, while the retracted bearing 263 does not affect the rotation of the rotating shaft 26.

[0031] Specifically, support rods 242 are symmetrically provided at both ends of the annular guide plate 24 and connected to the inner wall of the extraction and recovery integrated tank 2. The support rods 242 are mainly provided to ensure the position of the annular guide plate 24 in the extraction and recovery integrated tank 2 to prevent deviation.

[0032] Specifically, a thermometer 4 is provided on the top of the extraction and recovery integrated tank 2. The thermometer 4 is connected to an external controller and displays the real-time temperature on the external controller. The thermometer 4 is mainly used to monitor the temperature drop inside the extraction and recovery integrated tank 2 to ensure that the temperature inside the tank is below 10°C, so that the extractant can be recovered quickly.

[0033] The working principle of the utility model is as follows: when in use, the heating resistance wire 240 is activated by an external controller, and the wastewater generated by the reactor 1 enters the top of the extraction and recovery integrated tank 2 through the liquid inlet pipe 10, and is sprayed from the nozzle 241 to the interior of the extraction and recovery integrated tank 2 through the heated annular guide plate 24, and the extractant enters the interior of the tank through the extractant inlet 22. The drive motor 260 is started, and the rotating shaft 26 drives the stirring rod 261 and the scraper 262 to move, so that the wastewater and the extractant are evenly mixed, thereby improving the extraction efficiency; the condenser 272 is started to cool down, so that the temperature in the tank is below 10°C, so that the wastewater and the extractant are separated and then enter the extractant recovery port 21 through the circulation pipe for re-extraction. The wastewater after extraction is transferred to the wastewater recovery tank 3, thereby realizing the recycling of the extractant and reducing the treatment cost of acrolein production wastewater.

[0034] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Based on the technical essence of the present invention and within the spirit and principles of the present invention, any simple modification, equivalent replacement and improvement of the above embodiment shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A system for treating wastewater from acrolein production, characterized in that: The invention comprises a reactor (1), wherein the top and bottom of the reactor (1) are respectively connected to the bottom and top of an extraction and recovery integrated tank (2); the extraction and recovery integrated tank (2) is provided with an extractant inlet (22), an extractant recovery port (21) and an extractant liquid discharge port (29); the extractant recovery port (21) is connected to the extractant liquid discharge port (29) via a circulation pipeline (25); and the bottom of the extraction and recovery integrated tank (2) is provided with a wastewater recovery tank (3) connected to a waste discharge port (28).

2. The system for treating acrolein production wastewater according to claim 1, wherein: The top of the extraction and recovery integrated tank (2) is provided with a liquid inlet (23), the liquid inlet (23) is connected to the bottom of the reactor (1) via a liquid inlet pipeline (10), and the end of the liquid inlet (23) located inside the extraction and separation integrated tank is provided with a connected annular guide plate (24), and the bottom of the guide plate is provided with a plurality of nozzles (241).

3. The system for treating acrolein production wastewater according to claim 2, wherein: A heating resistance wire (240) is provided inside the annular guide plate (24).

4. The system for treating acrolein production wastewater according to claim 2, wherein: The outer wall of the extraction and recovery integrated tank (2) is provided with a cooling cavity (27) having a water inlet (270) and a water outlet (271), and a plurality of condensing pipes (272) are provided in the cooling cavity (27).

5. The system for treating acrolein production wastewater according to claim 2, wherein: The bottom of the extraction and recovery integrated tank (2) is provided with a rotating shaft (26), the outer peripheral surface of the rotating shaft (26) is provided with a stirring rod (261), and the rotating shaft (26) is also provided with a scraper (262) in contact with the extraction and recovery integrated tank (2), the scraper (262) is U-shaped, and the two horizontal parts of the scraper (262) are respectively connected to the top and bottom of the rotating shaft (26).

6. The system for treating acrolein production wastewater according to claim 5, characterized in that: A bearing (263) is provided at the contact point between the rotating shaft (26) and the extraction and recovery integrated tank (2), and the bottom end of the rotating shaft (26) is connected to the output end of the driving motor (260).

7. The system for treating acrolein production wastewater according to claim 5, characterized in that: Support rods (242) are symmetrically provided at both ends of the annular guide plate (24) and are connected to the inner wall of the extraction and recovery integrated tank (2).

8. The system for treating acrolein production wastewater according to claim 5, characterized in that: A thermometer (4) is provided on the top of the extraction and recovery integrated tank (2).

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