Continuous water distribution system for epoxy preparation process

Abstract

The continuous water distribution system comprises a layering tower, the feeding end of the layering tower is connected with an epoxy mixing trough through a feeding pipe, the upper layer of the layering tower is connected with an epoxy buffer tank through a first epoxy pipeline, the epoxy buffer tank is connected with an epoxy collecting tank through a second epoxy pipeline, and the epoxy collecting tank is connected with a water outlet of the layering tower. The bottom of the layering tower is connected with a saline water collecting tank through a first saline water pipeline, the saline water collecting tank is connected with a saline water collecting tank, a saline water return pipe is connected between the layering tower and the saline water collecting tank, and a second saline water pipeline is connected between the epoxy buffer tank and the saline water collecting tank. The system is simple in structure, an epoxy mixture can be continuously treated, separated epoxy and saline water can be subjected to secondary treatment, the interior of the system can stably run according to the setting of the liquid level, the separation effect and the separation purity can be improved through secondary treatment, and the yield and the purity of epoxy are integrally improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pesticide intermediate production, in particular to a continuous water separation system for an epoxy preparation process. Background Technique

[0002] Epoxy (2-[2-(4-chlorophenyl)ethyl]-2-(1,1-dimethylethyl)-oxirane), this product is an intermediate of the triazole fungicide tebuconazole. Tebuconazole is a sterol demethylation inhibitor and is a highly effective fungicide for seed treatment or foliar spraying of important cash crops. In the synthesis of epoxy, it needs to be carried out in thioether. After the reaction is completed, the thioether needs to be separated and recycled. Steam is quantitatively introduced into the thioether stripping tower, and the low-boiling thioether is separated from the upper end of the stripping tower through a condenser. Therefore, the brine in the epoxy mixture needs to be removed.

[0003] Since the entire epoxy preparation process is continuous, it is necessary to ensure that each process in the epoxy system can be carried out continuously. For this reason, we propose a continuous water separation system for an epoxy preparation process to solve the above problems. Content of the Utility Model

[0004] This application provides a continuous water separation system for an epoxy preparation process, which solves the problems of continuous dehydration of epoxy and high-purity and high-yield recovery.

[0005] This application provides a continuous water separation system for an epoxy preparation process, including a separation tower. The feeding end of the separation tower is connected with an epoxy mixture tank through a feeding pipe. The upper layer of the separation tower is connected with an epoxy buffer tank through a first epoxy pipe. The epoxy buffer tank is connected with an epoxy collection tank through a second epoxy pipe. The bottom of the separation tower is connected with a brine collection tank through a first brine pipe. The brine collection tank is connected with a brine collection trough. A brine return pipe is connected between the separation tower and the brine collection tank. A second brine pipe is connected between the epoxy buffer tank and the brine collection tank.

[0006] Preferably, a sampler is installed on the feeding pipe.

[0007] Preferably, the feeding pipe is installed at the middle position of the separation tower.

[0008] Preferably, a gas phase balance pipe is installed between the separation tower, the epoxy buffer tank and the brine collection tank.

[0009] Preferably, gas phase balance pipes are connected to both sides of the switching valve of the second brine pipe.

[0010] Preferably, four-way sight glasses are installed on the first epoxy pipe, the second epoxy pipe, the first brine pipe and the second brine pipe.

[0011] Preferably, a liquid level gauge is installed in the layered tower and the epoxy buffer tank.

[0012] As can be seen from the above technical solutions, the present application provides a continuous water separation system for an epoxy preparation process. During the processing of the present application, the separated crude epoxy mixture is controlled to a set flow rate through an epoxy mixture tank and sent into the layered tower. Among them, the upper-layer epoxy enters the epoxy buffer tank through the first epoxy pipeline, and the upper-layer epoxy in the epoxy buffer tank enters the epoxy collection tank through the second epoxy pipeline. The bottom brine of the layered tower is sent into the brine collection tank through the first brine pipeline. When the brine layer in the layered tower is too high, the first epoxy pipeline can be temporarily closed to lower the water level in the layered tower. On the contrary, when the brine layer is too low, the first brine pipeline can be closed to restore the normal brine level. When the brine in the brine collection tank is drained into the brine collection tank for a set time, the connection with the brine collection tank is closed, and all the brine in the brine collection tank is pumped into the layered tower for treatment. After the liquid level of the brine collection tank returns to the set position, the drainage is carried out again.

[0013] Compared with the prior art, the beneficial effects of the present utility model are:

[0014] 1. Through the setting of the layered tower, the crude epoxy mixture in the production system can be continuously received and separated, ensuring the continuous operation of the system;

[0015] 2. Through the setting of the epoxy buffer tank, the separated epoxy is separated for the second time, which can be statically separated or dynamically separated. The separated epoxy has a higher purity, which can reduce the energy consumption of subsequent rectification and improve the product purity;

[0016] 3. Through the brine collection tank, the brine generated in each link can be collected and treated. The brine is sent into the brine collection tank for treatment, and the accumulated remaining substances are regularly sent back to the layered tower for treatment, achieving the secondary treatment ability of the brine.

[0017] In summary, the structure of this system is simple, which can continuously process the epoxy mixture, and can perform secondary treatment on the separated epoxy and brine. The system can operate stably according to the liquid level setting inside. The secondary treatment can improve the separation effect and separation purity, and overall improve the yield and purity of epoxy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the present application, the drawings required for use in the implementation cases will be briefly introduced below. Obviously, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

[0019] Figure 1Schematic diagram of the structure of a continuous water separation system for an epoxy preparation process proposed by the present utility model;

[0020] In the figure: 1 stratification tower, 2 brine return pipe, 3 sampler, 4 epoxy mixture tank, 5 brine collection tank, 6 gas phase balance pipe, 7 first epoxy pipeline, 8 first brine pipeline, 9 epoxy buffer tank, 10 second epoxy pipeline, 11 second brine pipeline, 12 epoxy collection tank, 13 brine collection tank. Specific embodiments

[0021] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings.

[0022] See Figure 1 , a continuous water separation system for an epoxy preparation process. This application is used for continuous water separation after epoxy cyclization to reduce the energy consumption in the rectification process and improve the purity. Specifically, it includes a stratification tower 1. The stratification tower 1 is used to separate epoxy and brine. The brine in this application is mainly potassium sulfate produced after the reaction of potassium hydroxide, forming a mixture with crude epoxy. After desulfurization of ether, they jointly enter the stratification tower 1. The brine and epoxy in the stratification tower 1 are separated. Specifically, the feed end of the stratification tower 1 is connected to an epoxy mixture tank 4 through a feed pipe. The flow rate of the epoxy mixture entering the stratification tower 1 is controlled by controlling the flow rate of the feed pipe, and the feed pipe is installed at the middle position of the stratification tower 1. The epoxy mixture is stratified in the middle of the stratification tower 1. Among them, the upper layer of the stratification tower 1 is connected to an epoxy buffer tank 9 through a first epoxy pipeline 7. The separated epoxy enters the epoxy buffer tank 9 through the first epoxy pipeline 7 to ensure the stable liquid level of the stratification tower 1 and simultaneously perform secondary separation on the separated epoxy. The epoxy buffer tank 9 is connected to an epoxy collection tank 12 through a second epoxy pipeline 10. The epoxy after secondary separation enters the epoxy collection tank 12 for rectification treatment;

[0023] The bottom of the stratification tower 1 is connected to a brine collection tank 13 through a first brine pipeline 8. The brine collection tank 13 collects the brine in each link and performs secondary stratification treatment on the brine. The brine collection tank 13 is connected to a brine collection tank 5. The brine in the brine collection tank 13 is sent into the brine collection tank 5 and then sent to the water treatment equipment. A brine return pipe 2 is connected between the stratification tower 1 and the brine collection tank 13. After the brine collection tank 13 operates for a period of time, all the brine needs to be pumped into the stratification tower 1 for re-treatment, and the accumulated epoxy in the brine collection tank 13 is sent back to the stratification tower 1 for recovery. A second brine pipeline 11 is connected between the epoxy buffer tank 9 and the brine collection tank 13. The brine separated by the epoxy buffer tank 9 is also sent into the brine collection tank 13 to complete the continuous and stable operation of the entire system.

[0024] In the present utility model, a sampler 3 is installed on the feed pipe. The pressure and flow of the system are stable. After closing the loop, sampling can be carried out at the feed pipe to detect the quality of the crude epoxy mixture.

[0025] In the present utility model, a gas-phase balance pipe 6 is installed between the stratification tower 1, the epoxy buffer tank 9 and the brine collection tank 13 to ensure that the air pressures in the stratification tower 1, the epoxy buffer tank 9 and the brine collection tank 13 are within the same stable range, thus ensuring smooth flow between the pipelines.

[0026] In some embodiments, gas-phase balance pipes 6 are connected on both sides of the on-off valve of the second brine pipeline 11 to ensure that the opening of the pipeline will not cause large flow disturbances to the stratification quality due to pressure difference.

[0027] In some embodiments, four-way sight glasses are installed on the first epoxy pipeline 7, the second epoxy pipeline 10, the first brine pipeline 8 and the second brine pipeline 11, so as to observe the stratification quality of each link and timely discover problem pipelines.

[0028] In some embodiments, liquid level gauges are installed in the stratification tower 1 and the epoxy buffer tank 9. Through the liquid level gauges, the stratification tower 1 and the epoxy buffer tank 9 can be observed to release brine in time to adjust the brine height, further improving the stability of the system.

[0029] As can be seen from the above technical solutions, during the processing of the present application, the flow rate of the separated crude epoxy mixture is controlled to a set value by the epoxy mixture tank 4 and sent into the stratification tower 1. The upper-layer epoxy therein enters the epoxy buffer tank 9 through the first epoxy pipeline 7. The upper-layer epoxy in the epoxy buffer tank 9 enters the epoxy collection tank 12 through the second epoxy pipeline 10. The bottom brine of the stratification tower 1 is sent into the brine collection tank 13 through the first brine pipeline 8. When the brine layer in the stratification tower 1 is too high, the first epoxy pipeline 7 can be temporarily closed to make the water level in the stratification tower 1 drop. On the contrary, when the brine layer is low, the first brine pipeline 8 can be closed to make the brine level return to normal. When the brine in the brine collection tank 13 is discharged into the brine collection tank 5 for a set time, the connection with the brine collection tank 5 is closed, and all the brine in the brine collection tank 13 is pumped into the stratification tower 1 for treatment. After the liquid level of the brine collection tank 13 returns to the set position, the discharge is carried out again;

[0030] In static separation, the total liquid level height and the brine liquid level height of the stratification tower 1 are set. When the total liquid level height is reached, first, the epoxy in the epoxy buffer tank 9 is sent into the epoxy collection tank 12, and then the epoxy in the stratification tower 1 is sent into the epoxy buffer tank 9 until the set height and then the feeding is stopped. Then, static buffering is carried out again and again. When the brine in the stratification tower 1 reaches the specified height, first, the brine in the brine collection tank 13 is sent into the brine collection tank 5, and then the brine in the stratification tower 1 is sent into the brine collection tank 13 and stopped when the specified height is reached. This process is repeated in turn. Static separation can effectively improve the separation purity;

[0031] In dynamic separation, epoxy continuously and stably feeds into the epoxy buffer tank 9 and the brine collection tank 13. It is only necessary to ensure that the liquid level in the separation tower 1 is not lower than the minimum value. While feeding epoxy into the epoxy buffer tank 9, the epoxy at the top is sent to the epoxy collection tank 12. While feeding brine into the brine collection tank 13, the low-layer brine is sent to the brine collection trough 5. The dynamic separation can operate continuously and be adjusted in real time according to the production volume.

[0032] Those skilled in the art will readily conceive of other embodiments of the present application after considering the specification and the practice of the application disclosed herein. The present application is intended to cover any variations, uses, or adaptations of the present application, which follow the general principles of the present application and include the common general knowledge or conventional technical means in the technical field not disclosed in the present application. The specification and the embodiments are only regarded as exemplary, and the true scope of the present application is pointed out by the claims.

[0033] It should be understood that the present application is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The embodiments of the present application described above do not constitute a limitation on the protection scope of the present application.

Claims

1. A continuous water separation system for an epoxy preparation process, comprising a stratified tower (1), characterized in that: The feeding end of the layered tower (1) is connected to an epoxy mixture tank (4) through a feeding pipe. The upper layer of the layered tower (1) is connected to an epoxy buffer tank (9) through a first epoxy pipeline (7). The epoxy buffer tank (9) is connected to an epoxy collection tank (12) through a second epoxy pipeline (10). The bottom of the layered tower (1) is connected to a brine collection tank (13) through a first brine pipeline (8). The brine collection tank (13) is connected to a brine collection trough (5). A brine return pipe (2) is connected between the layered tower (1) and the brine collection tank (13). A second brine pipeline (11) is connected between the epoxy buffer tank (9) and the brine collection tank (13).

2. The continuous water separation system for an epoxy preparation process according to claim 1, characterized in that A sampler (3) is installed on the feeding pipe.

3. The continuous water separation system for an epoxy preparation process according to claim 1, characterized in that, The feeding pipe is installed at the middle position of the layered tower (1).

4. The continuous water separation system for an epoxy preparation process according to claim 1, characterized in that, A gas phase balance pipe (6) is installed between the layered tower (1), the epoxy buffer tank (9) and the brine collection tank (13).

5. The continuous water separation system for an epoxy preparation process according to claim 1, wherein, Gas phase balance pipes (6) are connected to both sides of the on-off valve of the second brine pipeline (11).

6. The continuous water separation system for an epoxy preparation process according to claim 1, characterized in that, Four-way sight glasses are installed on the first epoxy pipeline (7), the second epoxy pipeline (10), the first brine pipeline (8) and the second brine pipeline (11).

7. A continuous water separation system for an epoxy preparation process according to claim 1, characterized in that, Liquid level gauges are installed in the layered tower (1) and the epoxy buffer tank (9).

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