An ester water separation esterification column for ethyl acetate synthesis

Abstract

The utility model discloses an ester water separation esterification tower for ethyl acetate synthesis, including separation tower, the separation tower upper end is connected in the storage tank through the condenser, the storage tank lower extreme is equipped with the water outlet, the storage tank lower extreme is connected still in the dosing tank, and the dosing tank is connected in the phase separator, the separation tower lower part is connected still in the auxiliary tower, the auxiliary tower upper end is connected in the dosing tank through the second condenser, the storage tank is connected in the drying box, and the drying box is connected in the auxiliary tower. The utility model discloses through the separation tower heating crude ethyl acetate, and the azeotrope of ethanol-ethyl acetate-water is evaporated and condensed, and then part liquid refluxes to the auxiliary tower and heats, and when refluxing, passes through the drying agent, and further removes water, improves the purification effect of ethyl acetate, and the design of two groups of storage tanks also is convenient for the liquid standing when condensing, and the whole structure does not stop working.

Description

Technical Field

[0001] This utility model relates to the field of ethyl acetate synthesis technology, specifically to an ester-water separation esterification tower for ethyl acetate synthesis. Background Technology

[0002] Ethyl acetate is generally synthesized by esterification of ethanol and acetic acid under concentrated sulfuric acid catalysis. However, the ethyl acetate produced by esterification contains water, ethanol, etc., and requires further purification. The existing purification method generally uses distillation. However, in this method, when the ethyl acetate-ethanol-water azeotrope is refluxed after condensation, it carries a lot of water, which reduces the purification efficiency. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of the aforementioned background technology by providing an ester-water separation esterification tower for the synthesis of ethyl acetate that offers good ester-water separation performance and high efficiency.

[0004] To achieve the above objectives, this utility model provides an ester-water separation esterification tower for the synthesis of ethyl acetate, which adopts the following technical solution: An ester-water separation esterification tower for the synthesis of ethyl acetate includes a separation tower, the upper end of which is connected to a storage tank via a condenser. The lower end of the storage tank is provided with a water outlet and is also connected to a dosing tank. The dosing tank is connected to a phase separator. The lower part of the separation tower is also connected to an auxiliary tower. The upper end of the auxiliary tower is connected to the dosing tank via a second condenser. The storage tank is connected to a drying box, which is connected to the auxiliary tower.

[0005] A further improvement of the ester-water separation esterification tower for the synthesis of ethyl acetate in this invention is that the drying chamber is equipped with several drying tubes, and the drying tubes are filled with desiccant. The liquid in the storage tank flows into the auxiliary tower through the desiccant.

[0006] A further improvement of the ester-water separation esterification tower for the synthesis of ethyl acetate in this invention is that two sets of storage tanks are arranged in parallel, and valves are provided on the pipes connecting the two sets of storage tanks to the condenser.

[0007] A further improvement of the ester-water separation esterification tower for the synthesis of ethyl acetate in this invention is that the upper end of the dosing tank is provided with a dosing port for saturated sodium carbonate feed.

[0008] A further improvement of the ester-water separation esterification tower for the synthesis of ethyl acetate in this invention is that an ethyl acetate collection tank is connected to the lower end of the phase separator.

[0009] Compared with the prior art, the beneficial effects of this utility model are: This invention heats crude ethyl acetate in a separation tower to distill and condense the azeotrope of ethanol-ethyl acetate-water. A portion of the liquid is then refluxed to an auxiliary tower for heating. During reflux, a drying agent is passed through the tower to further remove water, thereby improving the purification effect of ethyl acetate. At the same time, the design of two sets of storage tanks facilitates the continuous operation of the entire structure when the condensed liquid is allowed to settle. Attached Figure Description

[0010] To more clearly illustrate the technical solutions of the embodiments of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them: Figure 1 This is a schematic diagram of the structure of this utility model; In the diagram: 1 Separation tower, 2 Condenser, 3 Storage tank, 4 Drying box, 5 Auxiliary tower, 6 Second condenser, 7 Dosing tank, 8 Phase separator. Detailed Implementation

[0011] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0012] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0013] Secondly, this utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views showing the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. In addition, in actual manufacturing, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0014] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0015] like Figure 1As shown, an ester-water separation esterification tower for ethyl acetate synthesis includes a separation tower 1. The upper end of the separation tower is connected to a storage tank 3 via a condenser 2. The lower end of the storage tank has a water outlet and is also connected to a dosing tank 7. The dosing tank is connected to a phase separator 8. The lower part of the separation tower is also connected to an auxiliary tower 5. The upper end of the auxiliary tower is connected to the dosing tank via a second condenser. The storage tank is connected to a drying oven 4, which is connected to the auxiliary tower. Both the separation tower and the auxiliary tower are heating towers.

[0016] Specifically, the drying chamber contains several drying tubes filled with a desiccant. Liquid in the storage tank flows into an auxiliary tower through the desiccant, which can be anhydrous magnesium sulfate. The desiccant reduces the water content of the refluxed ethyl acetate, thus increasing the purity of the ethyl acetate upon reheating.

[0017] Furthermore, there are two sets of storage tanks 3 arranged in parallel, and valves are installed on the pipes connecting the two sets of storage tanks to the condenser.

[0018] The dosing tank is equipped with a dosing port at the top for feeding saturated sodium carbonate. An ethyl acetate collection tank is connected to the bottom of the phase separator.

[0019] The working principle of this invention is as follows: Crude ethyl acetate produced in the esterification reaction tower enters the esterification separation tower. The separation tower is heated, and the ethyl acetate-ethanol-water azeotrope, as well as ethyl acetate and ethanol, are distilled off from the top of the tower. After passing through a condenser, the ethyl acetate is placed in a storage tank. After settling, the lower aqueous phase is discharged into an external water tank. Then, part of the oil phase carries the aqueous phase into the dosing tank. Part of the oil phase and the aqueous phase pass through a drying box and enter the auxiliary tower. Ethyl acetate comes into countercurrent contact with the liquid phase evaporated in the auxiliary tower and evaporates again. After being condensed by a second condenser, it is placed in the dosing tank. Saturated sodium carbonate is added, and the mixture enters the phase separator. The oil phase enters the ethyl acetate collection tank to obtain dehydrated and purified ethyl acetate.

[0020] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the features in the embodiments disclosed in this invention can be combined with each other in any way. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An ester-water separation esterification tower for the synthesis of ethyl acetate, characterized in that, The system includes a separation tower, the upper end of which is connected to a storage tank via a condenser. The lower end of the storage tank has a water outlet and is also connected to a dosing tank, which is connected to a phase separator. The lower part of the separation tower is also connected to an auxiliary tower, the upper end of which is connected to the dosing tank via a second condenser. The storage tank is connected to a drying box, which is connected to the auxiliary tower.

2. The ester-water separation esterification tower for the synthesis of ethyl acetate according to claim 1, characterized in that, The drying chamber is equipped with several drying tubes, each containing a desiccant. Liquid in the storage tank flows into the auxiliary tower through the desiccant.

3. The ester-water separation esterification tower for the synthesis of ethyl acetate according to claim 2, characterized in that, The storage tanks are arranged in two groups, side by side, and valves are installed on the pipes connecting the two groups of storage tanks to the condenser.

4. The ester-water separation esterification tower for the synthesis of ethyl acetate according to claim 3, characterized in that, The upper end of the dosing tank is equipped with a dosing port for feeding saturated sodium carbonate.

5. An ester-water separation esterification tower for the synthesis of ethyl acetate according to claim 4, characterized in that, The lower end of the phase separator is connected to an ethyl acetate collection tank.

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