Acrolein separation device for producing epichlorohydrin

Abstract

The utility model discloses an acrolein separating device for producing epichlorohydrin, which comprises a separating tank and a water tank, a balance pipe is connected between the top of the separating tank and the top of the water tank, the upper portion of the separating tank is provided with a primary distillation cooling material inlet and a tap water inlet, and a vertically arranged partition plate is installed in the separating tank. An inner cavity of the separation tank is divided into a separation cavity and an oil storage cavity through a partition plate, and an oil pipeline communicating the separation cavity with the oil storage cavity is installed on the partition plate. The bottom of the separation cavity is provided with a tap water outlet, a circulating device is connected between the tap water outlet and the tap water inlet, and the upper part of the separation cavity is provided with a tap water overflow port which is communicated with the water tank through an overflow pipeline. According to the utility model, the separation tank with the tap water inlet is arranged to replace a distillation tower to separate dichloropropanol, so that a large amount of heat is saved, and the production cost is reduced; and by arranging the partition plate, oil-water separation of the distilled matter is realized, the water phase is prevented from entering the primary distillation tower to cause rise of moisture in the finished product epoxy chloropropane, and the product quality is ensured.

Description

Technical Field

[0001] This utility model relates to an epichlorohydrin production equipment, and more particularly to an acrolein separation device for epichlorohydrin production. Background Technology

[0002] Epichlorohydrin is mainly used as a raw material in organic synthesis, and also as a solvent, plasticizer, and surfactant. Currently, there are three main epichlorohydrin production processes on the market: the propylene acetate method, the glycerol method, and the direct epoxidation method of allyl chloride.

[0003] The preparation of epichlorohydrin via the glycerol process generates certain byproducts, including tar produced during glycerol chlorination, acrolein produced during dichloropropanol cyclization, and high-boiling-point substances generated during product distillation. The presence of these substances affects the yield and reduces the purity of the finished epichlorohydrin, failing to meet the needs of some customers. In the original process, acrolein was separated from epichlorohydrin by distillation, a process that consumes a large amount of heat, resulting in significant energy consumption. Furthermore, the distilled acrolein is unsuitable for sale and must be treated as production waste, further increasing costs. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide an acrolein separation device for epichlorohydrin production that is reasonably designed, easy to use, and effectively removes acrolein from epichlorohydrin, in order to address the shortcomings of the existing technology.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An acrolein separation device for epichlorohydrin production is characterized by comprising a separation tank and a water tank, with a balance pipe connecting the tops of the separation tank and the water tank. The upper part of the separation tank has a primary distillation cooling material inlet and a tap water inlet, and the bottom of the separation tank has a reflux pipe connected to the primary distillation column. A vertically arranged baffle is installed inside the separation tank, dividing the inner cavity of the separation tank into a separation chamber and an oil storage chamber by the baffle. An oil passage pipe connecting the separation chamber and the oil storage chamber is installed on the baffle, with one end extending to the bottom of the separation chamber and the other end extending into the oil storage chamber. A reflux pipe connected to the primary distillation column is located at the bottom of the oil storage chamber, and a reflux pump is installed on the reflux pipe. A tap water outlet is located at the bottom of the separation chamber, and a circulation device connects the tap water outlet and the tap water inlet. A tap water overflow port is located at the upper part of the separation chamber, connected to the water tank via an overflow pipe. A liquid outlet pipe connected to a flash tank is located at the bottom of the water tank.

[0007] The technical problem to be solved by this utility model can also be achieved through the following technical solution: the circulation device includes a mixer and a circulation pipeline. One end of the circulation pipeline is connected to the oil phase outlet, and the other end of the circulation pipeline is connected to the mixer through a power pump. The mixer is equipped with a tap water pipeline, and the outlet of the mixer is connected to the separator through a water outlet pipeline.

[0008] The technical problem to be solved by this utility model can also be achieved through the following technical solution, wherein the mixer is a static mixer.

[0009] The technical problem to be solved by this utility model can also be achieved through the following technical solution: a reflux pipe connected to the primary distillation tower is provided at the bottom of the separation chamber, and a reflux pump is installed on the reflux pipe.

[0010] The technical problem to be solved by this utility model can also be achieved by the following technical solution: a connecting pipe for receiving the light components distilled from the top of the primary distillation column is provided at the top of the separation tank, and the connecting pipe extends below the water surface in the separation chamber.

[0011] Compared with existing technologies, this invention replaces the distillation column with a separation tank equipped with a tap water inlet for separating dichloropropanol, saving a significant amount of heat and reducing production costs. By incorporating a baffle plate, oil-water separation of the distillate is achieved, preventing the aqueous phase from entering the primary distillation column and increasing the moisture content of the finished epichlorohydrin, thus ensuring product quality. A static mixer ensures thorough mixing of oil and water. A water tank and balance pipe provide auxiliary support to the separation tank, allowing the extracted acrolein to be returned to the cyclization flash tank. The acrolein separation device for epichlorohydrin production described in this invention has a simple principle, reasonable structure, reduces personnel maintenance costs, decreases the number of manual operations, and improves production safety. Attached Figure Description

[0012] Figure 1 This is a structural diagram of the acrolein separation device for epichlorohydrin production according to the present invention.

[0013] In the diagram: 1-Separation tank, 2-Baffle plate, 3-Water tank, 4-Balance pipe, 5-Overflow pipe, 6-Mixer, 7-Power pump, 8-Return pipe, 9-Circulation pipe, 10-Outlet pipe, 11-Return pump, 12-Separation chamber, 13-Oil storage chamber, 14-Oil passage pipe. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0015] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0016] Reference Figure 1 An acrolein separation device for epichlorohydrin production includes a separation tank 1 and a water tank 3. A balance pipe 4 connects the tops of the separation tank 1 and the water tank 3. The upper part of the separation tank 1 is provided with a primary distillation cooling material inlet and a tap water inlet. The bottom of the separation tank 1 is provided with a reflux pipe 8 connected to the primary distillation tower. A vertically arranged baffle 2 is installed inside the separation tank 1. The inner cavity of the separation tank 1 is divided into a separation chamber 12 and an oil storage chamber 13 by the baffle 2. An oil pipe 14 connecting the separation chamber 12 and the oil storage chamber 13 is installed on the baffle 2. One end of the oil passage pipe 14 extends to the bottom of the separation chamber 12, and the other end extends into the oil storage chamber 13. The bottom of the oil storage chamber 13 is equipped with a reflux pipe 8 communicating with the primary distillation tower, and a reflux pump 11 is installed on the reflux pipe 8. The bottom of the separation chamber 12 is equipped with a tap water outlet, and a circulation device connects the tap water outlet and the tap water inlet. The upper part of the separation chamber 12 is equipped with a tap water overflow port, which communicates with the water tank 3 through an overflow pipe 5. The bottom of the water tank 3 is equipped with a liquid outlet pipe 10 communicating with the flash tank. Furthermore, since epichlorohydrin is less dense than water, the oil phase is forced into the oil storage chamber using the liquid level difference. The height of the oil passage pipe 14 is determined based on the density analysis of the oil-water interface. Moreover, the tap water used can also be the oil-water mixture condensed from the primary distillation tower.

[0017] The circulation device includes a mixer 6 and a circulation pipeline. One end of the circulation pipeline is connected to the oil phase outlet, and the other end is connected to the mixer via a power pump. The mixer is equipped with a tap water pipeline, and the outlet of the mixer is connected to the separator via an outlet pipeline. The mixer is a static mixer. A connecting pipeline for receiving the light components distilled from the top of the primary distillation column is provided at the top of the separator, and the connecting pipeline extends below the tap water level in the separator.

[0018] The working process of the acrolein separation device for epichlorohydrin production described in this utility model is as follows: After crude epichlorohydrin is distilled in the primary distillation tower, the light components distilled from the top of the primary distillation tower are condensed and enter the separation chamber 12 of the separation tank 1. Since the light components contain some epichlorohydrin, they are automatically separated into an oil phase at the bottom and an aqueous phase at the top in the separation chamber 12 of the separation tank 1. The lower oil phase, under the pressure of the upper aqueous phase and the tail gas pressure, enters the oil storage chamber 13 through the oil pipe 14. The oil phase in the oil storage chamber 13 enters the primary distillation tower through the reflux pipe 8 and the reflux pump 11. The oil-water mixture at the bottom of the separation chamber 12 enters the mixer 6 through the circulation pipe 9 and the power pump 7, where it is mixed with tap water and heated. After heating, it returns to the separation chamber of the separation tank 1, so that acrolein is fully extracted from the oil phase into the aqueous phase. Externally, by adding a baffle 2 inside the separation tank 1, the oil and water of the distillate are separated, preventing the aqueous phase from entering the primary distillation tower and causing an increase in the water content of the finished epichlorohydrin, thus ensuring product quality.

[0019] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An acrolein separation device for epichlorohydrin production, characterized in that, The device includes a separator and a water tank, with a balance pipe connecting the tops of the separator and the water tank. The separator has a primary distillation cooling material inlet and a tap water inlet at its upper part. A vertically arranged baffle is installed inside the separator, and the separator's interior is divided into a separation chamber and an oil storage chamber by the baffle. An oil pipe is installed on the baffle, connecting the separation chamber and the oil storage chamber. One end of the oil pipe extends to the bottom of the separation chamber, and the other end extends into the oil storage chamber. A tap water outlet is located at the bottom of the separation chamber, and a circulation device is connected between the tap water outlet and the tap water inlet. A tap water overflow port is located at the upper part of the separation chamber, and the tap water overflow port is connected to the water tank through an overflow pipe. A liquid outlet pipe connected to a flash tank is located at the bottom of the water tank.

2. The acrolein separation device for epichlorohydrin production according to claim 1, characterized in that, The circulation device includes a mixer and a circulation pipeline. One end of the circulation pipeline is connected to the oil phase outlet, and the other end of the circulation pipeline is connected to the mixer via a power pump. The mixer is equipped with a tap water pipeline, and the outlet of the mixer is connected to the separator via an outlet water pipeline.

3. The acrolein separation device for epichlorohydrin production according to claim 2, characterized in that, The mixer is a static mixer.

4. The acrolein separation device for epichlorohydrin production according to claim 1, characterized in that, A reflux pipe connected to the primary distillation column is provided at the bottom of the separation chamber, and a reflux pump is installed on the reflux pipe.

5. An acrolein separation device for epichlorohydrin production according to claim 1, characterized in that, The top of the separator is provided with a connecting pipe for receiving the light components distilled from the top of the primary distillation column, and the connecting pipe extends below the water surface in the separator chamber.

6. The acrolein separation device for epichlorohydrin production according to claim 1, characterized in that, The bottom of the oil storage chamber is provided with a reflux pipe that communicates with the primary distillation tower, and a reflux pump is installed on the reflux pipe.

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