Device for continuously treating epichlorohydrin wastewater
Through the device combining the fluidized bed tower body and the precipitation tank, combined with catalysts and organic amine compounds, the problems of weak treatment capacity and high cost of epoxychlorohydrin wastewater are solved, and efficient and low-cost wastewater treatment effect is achieved.
Patent Information
- Application Number
- CN202422342466.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-25
- Publication Date
- 2025-09-02
- Estimated Expiration
- 2034-09-25
AI Technical Summary
The existing epoxy chlorohydrin wastewater treatment equipment has weak treatment capacity and high cost, and the traditional methods consume high energy, are prone to corrosion in the equipment, and are not thorough in the treatment.
A device combining a fluidized bed tower body and a precipitation tank is used to combine catalysts and organic amine compounds to achieve the ring opening reaction of epoxy chlorohydrin and improve the treatment efficiency and selectivity through the circulating flow in the fluidized bed tower body and the separation of the precipitation tank.
It has achieved efficient treatment of epoxychlorohydrin wastewater, with a conversion rate of 97.5%, reducing costs, improving catalyst utilization and safety, and reducing equipment corrosion risks.
Smart Images
Figure CN223292315U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of wastewater treatment, and in particular relates to a device for continuously treating epichlorohydrin wastewater. Background Art
[0002] During the epichlorohydrin production process, a large amount of wastewater is discharged. Due to factors such as incomplete separation, incomplete condensation, and leakage during equipment cleaning, the wastewater contains epichlorohydrin. Epichlorohydrin is an organic compound with certain toxicity and biodegradability. It can affect the growth and activity of microorganisms in the environment, especially those involved in the decomposition of organic matter. Therefore, the treatment of epichlorohydrin wastewater requires special attention.
[0003] There are many methods for treating epichlorohydrin wastewater, including distillation, adsorption, and chemical methods. The distillation method evaporates epichlorohydrin by heating, and then condenses and collects it to recover epichlorohydrin, but it has disadvantages such as high energy consumption, large initial investment, and high operating costs; the adsorption method uses an adsorbent to adsorb epichlorohydrin molecules, but it has disadvantages such as easy saturation of the adsorbent and incomplete treatment; the chemical method for treating epichlorohydrin wastewater usually involves a variety of chemical substances, the equipment is prone to corrosion, and the maintenance cost is high. In addition, the traditional epichlorohydrin preparation process produces a large amount of wastewater, which is difficult to treat and will have a certain impact on the environment. The existing epichlorohydrin wastewater treatment equipment has weak treatment capacity and high cost. Utility Model Content
[0004] In view of the above deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a device for continuously treating epichlorohydrin wastewater. The device can perform ring-opening treatment on epichlorohydrin in the wastewater in combination with a catalyst and an organic amine compound, and has strong treatment capacity, good selectivity and low cost.
[0005] The technical solution adopted by the utility model to solve its technical problems is:
[0006] The utility model discloses a device for continuously treating epichlorohydrin wastewater, comprising a fluidized bed tower body and a sedimentation tank. The fluidized bed tower body is connected to the sedimentation tank through a circulation pipeline. An inner cylinder is provided inside the fluidized bed tower body. A mixing injection pipe is provided at the bottom of the fluidized bed tower body. One end of the mixing injection pipe passes through the bottom of the fluidized bed tower body. The other end of the mixing injection pipe is connected to a heat exchanger. The heat exchanger is connected to a wastewater inlet pipe. The wastewater inlet pipe is provided with an organic amine compound feed pipe. A wastewater outlet pipe is provided at the top of the sedimentation tank.
[0007] in:
[0008] The circulation pipeline includes a guide pipe and a return pipe. The guide pipe inlet is arranged at the upper part of the side wall of the fluidized bed tower body, the guide pipe outlet is arranged at the upper part of the side wall of the sedimentation tank, the return pipe inlet is arranged at the bottom of the sedimentation tank, and the return pipe outlet is arranged at the lower part of the side wall of the fluidized bed tower body.
[0009] The height of the guide pipe inlet is lower than the height of the guide pipe outlet, and the height of the return pipe inlet is higher than the height of the return pipe outlet.
[0010] The guide pipe is arranged in a Z shape as a whole.
[0011] A catalyst inlet is provided on the upper side wall of the fluidized bed tower body.
[0012] A catalyst outlet is provided at the bottom of the fluidized bed tower body.
[0013] An anti-blocking port is provided at the lower part of the side wall of the sedimentation tank.
[0014] A circulating water inlet pipe and a circulating water outlet pipe are respectively provided on both sides of the heat exchanger.
[0015] Both ends of the inner cylinder are opened.
[0016] The fluidized bed tower is filled with catalyst.
[0017] The beneficial effects of the utility model are:
[0018] The fluidized bed tower, inner cylinder, and mixing spray pipes achieve a more uniform mixing of epichlorohydrin wastewater, organic amine compounds, and catalyst, promoting the reaction and shortening reaction time. The continuous flow of epichlorohydrin wastewater, organic amine compounds, and catalyst within the fluidized bed tower enhances heat transfer, prevents local overheating, and improves reaction safety.
[0019] The catalyst repeatedly circulates between the fluidized bed tower and the sedimentation tank, which enhances the utilization of the catalyst, provides a larger surface contact area, and reduces the accumulation of the catalyst, reducing the risk of catalyst poisoning and deactivation.
[0020] By setting up a sedimentation tank, the catalyst in the fluidized bed tower is prevented from being directly carried away by the epichlorohydrin wastewater. The treated epichlorohydrin wastewater is separated from the catalyst in the sedimentation tank, which is convenient for catalyst recovery.
[0021] When epichlorohydrin wastewater undergoes a circulating reaction in the fluidized bed tower, some particulate pollutants will be produced. The sedimentation tank can remove the particulate pollutants in the epichlorohydrin wastewater and protect downstream equipment and the environment. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 It is a structural diagram of the utility model;
[0023] In the figure: 1. Fluidized bed tower body; 2. Inner tube; 3. Catalyst outlet; 4. Catalyst inlet; 5. Mixing injection pipe; 6. Draft pipe; 7. Reflux pipe; 8. Sedimentation tank; 9. Anti-blocking port; 10. Wastewater outlet pipe; 11. Heat exchanger; 12. Circulating water inlet pipe; 13. Circulating water outlet pipe; 14. Wastewater inlet pipe; 15. Organic amine compound feed pipe. DETAILED DESCRIPTION
[0024] The embodiments of the present invention will be further described below with reference to the accompanying drawings.
[0025] Example 1
[0026] like Figure 1 As shown, the utility model includes a fluidized bed tower body 1 and a sedimentation tank 8. The fluidized bed tower body 1 is connected to the sedimentation tank 8 through a circulation pipeline. An inner cylinder 2 is provided inside the fluidized bed tower body 1. A mixing injection pipe 5 is provided at the bottom of the fluidized bed tower body 1. One end of the mixing injection pipe 5 passes through the bottom of the fluidized bed tower body 1, and the other end of the mixing injection pipe 5 is connected to a heat exchanger 11. A wastewater inlet pipe 14 is connected to the heat exchanger 11, and an organic amine compound feed pipe 15 is provided on the wastewater inlet pipe 14. A wastewater outlet pipe 10 is provided at the top of the sedimentation tank 8.
[0027] The circulation pipeline includes a guide pipe 6 and a return pipe 7. The inlet of the guide pipe 6 is arranged at the upper part of the side wall of the fluidized bed tower body 1, and the outlet of the guide pipe 6 is arranged at the upper part of the side wall of the sedimentation tank 8. The inlet of the return pipe 7 is arranged at the bottom of the sedimentation tank 8, and the outlet of the return pipe 7 is arranged at the lower part of the side wall of the fluidized bed tower body 1.
[0028] The inlet height of the guide pipe 6 is lower than the outlet height of the guide pipe 6 , and the inlet height of the return pipe 7 is higher than the outlet height of the return pipe 7 .
[0029] The flow guide pipe 6 is arranged in a Z shape as a whole.
[0030] A catalyst inlet 4 is provided on the upper side wall of the fluidized bed tower body 1 .
[0031] A catalyst outlet 3 is provided at the bottom of the fluidized bed tower body 1 .
[0032] An anti-blocking port 9 is provided at the lower portion of the side wall of the sedimentation tank 8 .
[0033] A circulating water inlet pipe 12 and a circulating water outlet pipe 13 are respectively provided on both sides of the heat exchanger 11 .
[0034] Both ends of the inner tube 2 are opened.
[0035] The fluidized bed tower body 1 is filled with catalyst.
[0036] Working principle and process:
[0037] The catalyst is added into the fluidized bed tower body 1 through the catalyst inlet 4 until the volume occupied by the catalyst in the fluidized bed tower body 1 reaches one seventh of the total volume of the fluidized bed tower body 1 .
[0038] Organic amine compounds are introduced through the organic amine compound feed pipe 15, and epichlorohydrin wastewater is introduced through the wastewater inlet pipe 14. The organic amine compounds and epichlorohydrin wastewater form mixed wastewater in the wastewater inlet pipe 14. The mixed wastewater is heated to 80°C through the heat exchanger 11. The heated mixed wastewater is sprayed into the interior of the fluidized bed tower body 1 through the mixing injection pipe 5.
[0039] The mixed wastewater mixes with the catalyst inside the fluidized bed tower body 1 to form a mixture, which then flows upward through the inner tube 2 in a fully mixed flow. When the mixture reaches the top of the inner tube 2, most of the mixture flows back to the bottom of the fluidized bed tower body 1 through the gap between the inner tube 2 and the fluidized bed tower body 1. After reaching the bottom of the fluidized bed tower body 1, the mixture continues to flow upward through the inner tube 2, forming a circulating flow within the fluidized bed tower body 1. Another portion of the mixture enters the sedimentation tank 8 through the guide pipe 6. The catalyst in the mixture sinks to the bottom of the sedimentation tank 8 under the action of gravity. The catalyst at the bottom of the sedimentation tank 8 enters the fluidized bed tower body 1 through the reflux pipe 7 to continue catalysis. After the mixture has been in the fluidized bed tower body 1 for 0.5 hours, the epichlorohydrin wastewater treated in the sedimentation tank 8 enters the subsequent treatment process through the wastewater outlet pipe 10.
[0040] After testing, the conversion rate of epichlorohydrin in epichlorohydrin wastewater was 97.5%.
Claims
1. A device for continuously treating epichlorohydrin wastewater, comprising a fluidized bed tower (1), characterized in that: The invention also includes a sedimentation tank (8), a fluidized bed tower body (1) connected to the sedimentation tank (8) through a circulation pipeline, an inner cylinder (2) provided inside the fluidized bed tower body (1), a mixing injection pipe (5) provided at the bottom of the fluidized bed tower body (1), one end of the mixing injection pipe (5) passing through the bottom of the fluidized bed tower body (1), and the other end of the mixing injection pipe (5) connected to a heat exchanger (11), a wastewater inlet pipe (14) connected to the heat exchanger (11), an organic amine compound feed pipe (15) provided on the wastewater inlet pipe (14), and a wastewater outlet pipe (10) provided at the top of the sedimentation tank (8).
2. The device for continuously treating epichlorohydrin wastewater according to claim 1, characterized in that: The circulation pipeline includes a draft pipe (6) and a return pipe (7), wherein the draft pipe (6) inlet is arranged at the upper part of the side wall of the fluidized bed tower body (1), the draft pipe (6) outlet is arranged at the upper part of the side wall of the sedimentation tank (8), the return pipe (7) inlet is arranged at the bottom of the sedimentation tank (8), and the return pipe (7) outlet is arranged at the lower part of the side wall of the fluidized bed tower body (1).
3. The device for continuously treating epichlorohydrin wastewater according to claim 2, characterized in that: The inlet height of the guide pipe (6) is lower than the outlet height of the guide pipe (6), and the inlet height of the return pipe (7) is higher than the outlet height of the return pipe (7).
4. The device for continuously treating epichlorohydrin wastewater according to claim 3, characterized in that: The guide tube (6) is arranged in a Z-shape as a whole.
5. The device for continuously treating epichlorohydrin wastewater according to claim 1, characterized in that: A catalyst inlet (4) is provided on the upper side wall of the fluidized bed tower body (1).
6. The device for continuously treating epichlorohydrin wastewater according to claim 1, characterized in that: A catalyst outlet (3) is provided at the bottom of the fluidized bed tower body (1).
7. The device for continuously treating epichlorohydrin wastewater according to claim 1, characterized in that: An anti-blocking opening (9) is provided at the lower portion of the side wall of the sedimentation tank (8).
8. The device for continuously treating epichlorohydrin wastewater according to claim 1, characterized in that: A circulating water inlet pipe (12) and a circulating water outlet pipe (13) are respectively provided on both sides of the heat exchanger (11).
9. The device for continuously treating epichlorohydrin wastewater according to claim 1, characterized in that: Both ends of the inner cylinder (2) are opened.
10. The device for continuously treating epichlorohydrin wastewater according to claim 1, characterized in that: The fluidized bed tower (1) is filled with catalyst.