Acetone recovery condenser

Abstract

The acetone recovery condenser comprises a cylindrical barrel, the upper side and the lower side of the barrel are open sides and are in butt joint with a first gas collecting hood and a second gas collecting hood respectively, partition plates are arranged on the corresponding open sides of the barrel in a sealed mode, water cavities are formed in the positions, corresponding to the interior of the barrel, of the partition plates on the upper side and the lower side, and a plurality of cooling pipes are installed in the water cavities. And a spiral blade is mounted in the cooling pipe in a sleeving manner. The spiral blades form the spiral airflow channel in the cooling pipe, and when acetone steam passes through the spiral airflow channel, the flow speed is reduced, and the condensation effect is improved. After entering the first gas collecting cavity, acetone steam enters the second gas collecting cavity through the multiple cooling pipes, the steam is cooled and condensed into a liquid state when passing through the cooling pipes, the cooling pipes are vertically arranged, the cooled acetone is left in strands, and the recycling purpose is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical equipment, and particularly relates to an acetone recovery condenser. Background Art

[0002] When synthesizing waterborne polyurethane with a relatively high molecular weight, the acetone method, also known as the solvent method, does not affect the synthesis of waterborne polyurethane and has no impact on the miscibility of isocyanate and water. Using the acetone method can obtain waterborne polyurethane products with a uniform particle size distribution and good stability.

[0003] The advantages of synthesizing waterborne polyurethane by the acetone method mainly include the following aspects. The PU molecular chain extends in a homogeneous medium with good reproducibility; acetone can reduce the viscosity of the polymer, and can well control the viscosity of the prepolymer and the dispersion viscosity; acetone has a low boiling point and is easy to remove, and the final product is solvent-free.

[0004] The boiling point of acetone is 56.5°C. During distillation, the temperature can be controlled within this range to vaporize and separate acetone. The recovered acetone can be reused. Currently, acetone recovery is carried out through a multi-stage condenser. First, acetone is heated to boiling to the vapor state, and the vapor is recovered through the condenser. The condenser includes a water chamber and a plurality of cooling tubes located in the water chamber, and is recovered by liquefaction. However, the speed of the vapor passing through the cooling tubes is very fast, resulting in the transfer of acetone before complete liquefaction, leading to incomplete recovery. Summary of the Utility Model

[0005] The purpose of the utility model is to provide an acetone recovery condenser, which mainly solves the problem of low recovery efficiency caused by the fast speed of acetone vapor passing through the cooling tubes and short residence time.

[0006] To solve the above technical problems, the utility model is realized through the following technical solutions:

[0007] An acetone recovery condenser includes a cylindrical barrel body. Both the upper and lower sides of the barrel body are open sides, and are respectively connected to a first gas collecting hood and a second gas collecting hood. The barrel body is sealed with partition plates corresponding to the open sides. The upper and lower partition plates form a water chamber corresponding to the inside of the barrel body. A plurality of cooling tubes are installed in the water chamber. The first gas collecting hood forms a first gas collecting chamber corresponding to the lower side of the barrel body, and the second gas collecting hood forms a second gas collecting chamber corresponding to the upper side of the barrel body. The upper and lower pipe orifices of the cooling tubes have open sides corresponding to the partition plates and are respectively connected to the first gas collecting chamber and the second gas collecting chamber. A spiral blade is sleeved and installed in the cooling tubes.

[0008] Furthermore, a water inlet pipe and a water outlet pipe are connected to the side wall of the barrel body. The water inlet pipe is connected to the lower side of the water chamber, and the water outlet pipe is connected to the upper side of the water chamber.

[0009] Further, a water distribution tray is installed in the middle of the water chamber. The water inlet pipe extends to the middle of the water chamber and is connected to the water distribution tray. A plurality of water distribution pipes are connected to the circumferential side of the water distribution tray, and water outlet holes are formed on the upper side of the water distribution pipes.

[0010] Further, the first air collection hood is connected to an air inlet pipe. The pipe orifice end of the air inlet pipe extends to the first air collection chamber and is arranged with the pipe orifice facing downward through a guiding pipe. The first air collection hood is connected to a liquid discharge pipe corresponding to the narrow opening side at the lower side, and a liquid discharge valve is arranged on the liquid discharge pipe.

[0011] The second air collection hood is of a frustum-shaped structure and is connected to an exhaust pipe corresponding to the narrow opening end at the top.

[0012] The utility model has the following beneficial effects: The spiral blade is made of plastic material and has elasticity. It is inserted into the upper pipe orifice of the cooling pipe and is fixed in the cooling pipe by its own resilient elasticity, forming a spiral air flow channel in the cooling pipe. When acetone vapor passes through the spiral air flow channel, its speed decreases, and it continuously makes impact contact with the inner wall of the cooling pipe during the flow process, which helps to reduce the flow rate and improve the condensation effect.

[0013] The condenser of the utility model adopts the lower air inlet mode. After the acetone vapor enters the first air collection chamber, it enters the second air collection chamber through a plurality of cooling pipes. When the vapor passes through the cooling pipes, it cools and condenses into a liquid state. The cooling pipes are arranged vertically, and the cooled acetone flows down in a stream to achieve the purpose of recovery. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for describing the embodiments will be briefly introduced below.

[0015] Figure 1 : Structural schematic diagram of the present utility model.

[0016] Figure 2 : Structural schematic diagram of the cooling pipe and the partition plate of the present utility model.

[0017] Figure 3 : Structural schematic diagram of the installation of the water distribution tray of the present utility model.

[0018] In the drawings, the list of components represented by each reference numeral is as follows: cylinder body 3, first air collection hood 1, second air collection hood 2, partition plate 31, cooling pipe 4, spiral blade 41, water inlet pipe 5, water outlet pipe 6, water distribution tray 51, water distribution pipe 52, air inlet pipe 11, liquid discharge pipe 12, exhaust pipe 21. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying 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 of the embodiments.

[0020] As Figure 1-2 shown: An acetone recovery condenser includes a cylindrical barrel body 3, a housing structure. Both the upper and lower sides of the barrel body 3 are open sides, and are respectively butted with a first gas collecting hood 1 and a second gas collecting hood 2. The butting sides of the barrel body, the first gas collecting hood, and the second gas collecting hood are all flange structures and are provided with sealing rubber rings. The gas collecting hoods are all housing structures, and the overall shape is frustum-shaped. The barrel body 3 is hermetically sealed with partition plates 31 at the corresponding open sides. The partition plates are circular plate structures, and the sides are fixed and sealed with the inner side wall of the barrel body. The upper and lower partition plates 31 form a water cavity inside the barrel body 1 for filling cold water to absorb heat. A plurality of cooling pipes 4 are installed in the water cavity, and the cooling pipes are evenly arranged. The first gas collecting hood 1 forms a first gas collecting cavity corresponding to the lower side of the barrel body 3 as an intake chamber, and the second gas collecting hood 2 forms a second gas collecting cavity corresponding to the upper side of the barrel body as an exhaust chamber. The upper and lower pipe orifices of the cooling pipe 4 have open sides corresponding to the partition plate 31 and are respectively communicated with the first gas collecting cavity and the second gas collecting cavity. A spiral blade 41 is sleeved and installed in the cooling pipe 4. The spiral blade is made of plastic material and has elasticity. It is inserted from the upper pipe orifice of the cooling pipe and is fixed in the cooling pipe by its own resilient elasticity, forming a spiral gas flow channel in the cooling pipe. When the acetone vapor passes through this spiral gas flow channel, the speed decreases, and it continuously makes impact contact with the inner wall of the cooling pipe during the flow process, which helps to reduce the flow rate and improve the condensation effect.

[0021] The condenser of the present utility model adopts the method of lower intake. After the acetone vapor enters the first gas collecting cavity, it enters the second gas collecting cavity through a plurality of cooling pipes. When the vapor passes through the cooling pipes, it cools and condenses into a liquid state. The cooling pipes are vertically arranged, and the cooled acetone flows down in a stream to achieve the purpose of recovery.

[0022] A water inlet pipe 5 and a water outlet pipe 6 are communicated with the side wall of the barrel body 3. The water inlet pipe 5 is communicated with the lower side of the water cavity, and the water outlet pipe 6 is communicated with the upper side of the water cavity.

[0023] As Figure 3 shown: A water distribution tray 51 is installed in the middle of the water cavity. The water inlet pipe 5 extends to the middle of the water cavity and is communicated with the water distribution tray 51. A plurality of water distribution pipes 52 are communicated with the circumferential side of the water distribution tray 51, and water outlet holes are opened on the upper side of the water distribution pipes 52. The water distribution tray divides the water entering from the water inlet pipe into multiple parts and evenly distributes the water through each water distribution pipe. The water in the water cavity is replaced by the method of lower water inlet, which improves the heat absorption efficiency. At the same time, the water flows out through the water distribution pipes, preventing the water from directly rising in the water cavity, reducing the residence time of the heated water in the water cavity, and improving the condensation efficiency.

[0024] As Figure 1As shown in the figure: The first gas collecting hood 1 is connected with an intake pipe 11, and the pipe orifice end of the intake pipe 11 extends into the first gas collecting chamber and is arranged with the pipe orifice facing downward through a guiding pipe. The guiding pipe is arranged with a 90° downward bend to prevent the condensed liquid acetone from entering the intake pipe. The first gas collecting hood 1 is connected with a drain pipe 12 corresponding to the narrow side at the lower side, and the drain pipe 12 is provided with a drain valve. It is used to timely discharge the condensed acetone. The second gas collecting hood 2 is in a frustum shape and is connected with an exhaust pipe 21 corresponding to the narrow end at the top. It is used to collect the condensed gas, prepare to enter the next-stage condenser for multi-stage condensation, and fully recover acetone.

[0025] These embodiments are selected and specifically described in this specification in order to better explain the principle and practical application of the present utility model, so that those skilled in the relevant technical field can well understand and utilize the present utility model.

Claims

1. An acetone recovery condenser, characterized in that: The invention comprises a cylindrical body (3), wherein the upper and lower sides of the body (3) are both open sides and are respectively connected to a first air collecting hood (1) and a second air collecting hood (2); the corresponding open sides of the body (3) are sealed with partitions (31); the upper and lower partitions (31) correspond to the inside of the body (3) to form a water cavity, in which a plurality of cooling pipes (4) are installed; the first air collecting hood (1) corresponds to the lower side of the body (3) to form a first air collecting cavity, and the second air collecting hood (2) corresponds to the upper side of the body to form a second air collecting cavity; the upper and lower pipe opening sides of the cooling pipe (4) correspond to the partitions (31) and are respectively connected to the first air collecting cavity and the second air collecting cavity; and a spiral blade (41) is sleeved and installed in the cooling pipe (4).

2. An acetone recovery condenser according to claim 1, characterized in that: The side wall of the cylinder (3) is connected to a water inlet pipe (5) and a water outlet pipe (6); the water inlet pipe (5) is connected to the lower side of the water cavity, and the water outlet pipe (6) is connected to the upper side of the water cavity.

3. An acetone recovery condenser according to claim 2, characterized in that: A water distribution pan (51) is installed in the middle of the water cavity, the water inlet pipe (5) extends to the middle of the water cavity and is connected to the water distribution pan (51), a plurality of water distribution pipes (52) are connected to the circumferential side of the water distribution pan (51), and water outlet holes are provided on the upper sides of the water distribution pipes (52).

4. An acetone recovery condenser according to claim 1, characterized in that: The first air collecting hood (1) is connected to an air inlet pipe (11), the pipe mouth end of the air inlet pipe (11) extends to the first air collecting cavity and is arranged with the pipe mouth facing downwards through a guide pipe.

5. An acetone recovery condenser according to claim 4, characterized in that: The lower narrow opening side of the first gas collecting hood (1) is connected to a liquid discharge pipe (12), and the liquid discharge pipe (12) is provided with a liquid discharge valve.

6. An acetone recovery condenser according to claim 1, characterized in that: The second air collecting hood (2) is a truncated cone-shaped structure, and an exhaust pipe (21) is connected to the corresponding narrow end at the top.

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