Esterification kettle for producing n-propyl acetate

Abstract

The utility model discloses an esterification kettle for producing n-propyl acetate, which comprises a kettle body, a reaction cavity is arranged in the kettle body, a first outer cavity is arranged on the outer side of the middle lower part of the reaction cavity, a second outer cavity is arranged on the outer side of the first outer cavity, a feed port and an air outlet are arranged on the upper part of the reaction cavity, the air outlet is connected with a cooling structure, and the cooling structure is connected with a phase splitter. The feeding port is connected with the preheating structure, the preheating structure comprises a first preheating tank and a second preheating tank, an interlayer is arranged on the outer side of the first preheating tank, the second outer cavity is connected to the interlayer of the first preheating tank, the cooling structure comprises two sets of first coolers and second coolers which are sequentially arranged, and the first coolers are provided with material inlets and material outlets. The material outlet is connected to the second preheating tank. According to the utility model, the fast adjustment of cooling is realized through the second outer cavity, the heating problem of the heater is matched, the convenience of cooling after n-propyl acetate in the esterification kettle is esterified is ensured, meanwhile, waste heat is also utilized to the preheating structure, and the energy-saving effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of n-propyl acetate production equipment, and particularly relates to an esterification kettle for producing n-propyl acetate. Background Art

[0002] The production of n-propyl acetate generally involves the reaction of acetic acid and n-propanol under the catalysis of a catalyst. After cooling and phase separation, crude n-propyl acetate is obtained, and then through steps such as rectification, n-propyl acetate with higher purity is obtained. Among them, an esterification kettle is generally used in the esterification reaction process of acetic acid and n-propanol. In a conventional esterification kettle, an electric heater is generally directly arranged in the kettle to heat acetic acid and n-propanol. However, in the above heating method, when cooling is required, it can only be cooled by power-off and static cooling, which has the problem of uncontrollable cooling time. At the same time, there is also a loss of heat that cannot be utilized during direct static cooling, resulting in energy waste. Summary of the Utility Model

[0003] The purpose of the utility model is to provide an esterification kettle for producing n-propyl acetate, which can ensure quick and controllable temperature adjustment of the esterification kettle and effectively utilize the waste heat of the kettle body, aiming at the deficiencies in the above background art.

[0004] To achieve the above purpose, the utility model provides an esterification kettle for producing n-propyl acetate, and adopts the following technical scheme:

[0005] An esterification kettle for producing n-propyl acetate includes a kettle body. The kettle body includes a reaction chamber. A first outer chamber is arranged outside the middle and lower part of the reaction chamber, and a second outer chamber is arranged outside the first outer chamber. An inlet for feeding materials and an outlet for gas are arranged at the upper part of the reaction chamber. The outlet for gas is connected to a cooling structure, and the cooling structure is connected to a phase separator. The inlet for feeding materials is connected to a preheating structure. The preheating structure includes a first preheating tank and a second preheating tank. A sandwich layer is arranged outside the first preheating tank. A heater and a heating medium are arranged in the first outer chamber. The second outer chamber is used for the flow and cooling of cooling water. The second outer chamber is connected to the sandwich layer of the first preheating tank. The cooling structure includes two groups of first coolers and second coolers arranged in sequence. A material inlet and a material outlet are arranged on the first cooler. The material outlet is connected to the second preheating tank. The second preheating tank is connected to the inlet for feeding materials. The first preheating tank is connected to the second preheating tank. A second heater is arranged in the second preheating tank.

[0006] A further improvement of the esterification kettle for producing n-propyl acetate of the utility model is that a cooling water inlet and a cooling water outlet are arranged on the second cooler, and the cooling water outlet is connected to the sandwich layer of the first preheating tank.

[0007] A further improvement of the esterification kettle for producing n-propyl acetate of the utility model is that raw material inlets are arranged on both the first preheating tank and the second preheating tank.

[0008] A further improvement of the esterification kettle for producing n-propyl acetate in the present utility model lies in that the interlayer of the first preheating tank is also connected to the settling tank, and the settling tank is connected to the cooling water inlet of the second cooler.

[0009] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0010] The present utility model realizes the quick adjustment of temperature reduction through the second outer cavity, and cooperates with the heating problem of the heater to ensure the convenience of cooling after the esterification of n-propyl acetate in the esterification kettle. At the same time, the waste heat is also utilized in the preheating structure, improving the energy-saving effect. Description of the Drawings

[0011] Figure 1 It is a structural schematic diagram of the present utility model;

[0012] In the figure: 1 kettle body, 2 reaction cavity, 3 first outer cavity, 4 second outer cavity, 5 first preheating tank, 6 second preheating tank, 7 first cooler, 8 second cooler, 9 phase separator, 10 material inlet, 11 material outlet, 12 cooling water inlet, 13 cooling water outlet, 14 raw material inlet. Detailed Embodiment

[0013] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0014] As Figure 1 shown, an esterification kettle for producing n-propyl acetate includes a kettle body 1. The kettle body includes a reaction cavity 2. A first outer cavity 3 is provided on the outer side of the middle and lower part of the reaction cavity. A second outer cavity 4 is provided on the outer side of the first outer cavity. The upper part of the reaction cavity is provided with a feed inlet and an air outlet. The air outlet is connected to a cooling structure, and the cooling structure is connected to a phase separator 9. The feed inlet is connected to a preheating structure. The preheating structure includes a first preheating tank 5 and a second preheating tank 6. An interlayer is provided on the outer side of the first preheating tank. A heater and a heating medium are provided in the first outer cavity. The second outer cavity is used for the flow and temperature reduction of cooling water. The second outer cavity is connected to the interlayer of the first preheating tank. The cooling structure includes two groups of first coolers 7 and second coolers 8 arranged in sequence. A material inlet 10 and a material outlet 11 are provided on the first cooler. Heat exchange cooling is carried out through raw material materials. The material outlet is connected to the second preheating tank. The second preheating tank is connected to the feed inlet. The first preheating tank is connected to the second preheating tank. A second heater is provided in the second preheating tank.

[0015] Further, a cooling water inlet 12 and a cooling water outlet 13 are provided on the second cooler, and the cooling water outlet is connected to the interlayer of the first preheating tank.

[0016] Raw material inlets 14 are provided on both the first preheating tank and the second preheating tank, facilitating the feeding of raw materials acetic acid and n-propanol.

[0017] The interlayer of the first preheating tank is also connected to the settling tank, and the settling tank is connected to the cooling water inlet of the second cooler.

[0018] The working principle of the present utility model is as follows: Acetic acid and n-propanol are placed in the second preheating tank, preheated by the second heater and then enter the reaction chamber. The first outer chamber is heated, and the esterification reaction proceeds. The generated gas undergoes heat exchange with the material and cooling water twice, is separated in the phase separator, with part of it refluxed and part discharged to obtain crude propyl acetate. The heat-exchanged material can enter the second preheating tank, saving heating time; the cooling water after heat exchange is placed in the interlayer of the first preheating tank to exchange heat with the raw material. After a certain period of time, the water is discharged into the settling tank and used for cooling water circulation after being completely cooled; when the kettle body needs to be cooled after the esterification reaction, cold water is introduced into the second outer chamber to flow for heat exchange and cooling, and the heat-exchanged water also enters the interlayer of the first preheating tank.

[0019] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present utility model, the present utility model can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. An esterification kettle for the production of n-propyl acetate, characterized in that: It includes a kettle body. Inside the kettle body, there is a reaction chamber. A first outer chamber is provided on the outer side of the middle and lower part of the reaction chamber, and a second outer chamber is provided on the outer side of the first outer chamber. The upper part of the reaction chamber is provided with a feed inlet and an air outlet. The air outlet is connected to a cooling structure, and the cooling structure is connected to a phase separator. The feed inlet is connected to a preheating structure. The preheating structure includes a first preheating tank and a second preheating tank. There is a sandwich layer on the outer side of the first preheating tank. A heater and a heating medium are provided in the first outer chamber. The second outer chamber is used for the flow and cooling of cooling water. The second outer chamber is connected to the sandwich layer of the first preheating tank. The cooling structure includes two groups of first coolers and second coolers arranged in sequence. A material inlet and a material outlet are provided on the first cooler. The material outlet is connected to the second preheating tank. The second preheating tank is connected to the feed inlet. The first preheating tank is connected to the second preheating tank. A second heater is provided in the second preheating tank.

2. The esterification kettle for producing n-propyl acetate according to claim 1, characterized in that: A cooling water inlet and a cooling water outlet are provided on the second cooler. The cooling water outlet is connected to the sandwich layer of the first preheating tank.

3. The esterification kettle for producing n-propyl acetate according to claim 2, characterized in that: Raw material inlets are provided on both the first preheating tank and the second preheating tank.

4. A propyl acetate production esterification kettle according to claim 3, characterized in that: The sandwich layer of the first preheating tank is also connected to a settling tank, and the settling tank is connected to the cooling water inlet of the second cooler.

Images