A continuous rectification device for recovering acetone

Abstract

The utility model discloses a continuous rectification unit of acetone recovery, including recovery kettle, rectifying column, shell and tube preheating condenser, overhead condenser and acetone receiving tank. Recovery kettle is enamel material, is equipped with steam heating coil and wastewater outlet in the bottom, rectifying column is by first tower section and second tower section and is connected by flange and is composed, is filled with wire mesh stainless steel, shell and tube preheating condenser utilize the high temperature wastewater waste heat of recovery kettle and carry out preheating to raw material, reduce energy consumption, overhead condenser will the acetone steam of rectifying column top condense recovery. Recovery kettle volume is 5000L, and rectifying column nominal diameter is Phi 500mm, and tower section height is 3m, and steam coil working pressure is 0.3 0.5MPa, and maintains kettle temperature 100 2 DEG C, and filler height is 2.8m. Control system linkage feed pump and discharge valve, ensure continuous stable operation.

Description

Technical Field

[0001] This utility model relates to the field of chemical technology, specifically to a distillation apparatus for continuous acetone recovery. Background Technology

[0002] Acetone, as an important organic solvent and chemical raw material, is widely used in pharmaceuticals, coatings, plastics, and chemical synthesis industries. These industries generate large amounts of acetone-containing wastewater or liquid during production processes. Direct discharge of acetone not only causes serious environmental pollution but also represents a waste of valuable resources. Therefore, efficient acetone recovery is both economically beneficial and environmentally significant.

[0003] Distillation, utilizing the boiling point difference between acetone and water, has become the mainstream technology for acetone recovery due to its high efficiency. However, with the increasing demands for continuity, energy consumption control, and ease of operation and maintenance in chemical production, traditional acetone distillation recovery units have gradually revealed their insufficient adaptability. How to ensure recovery purity and yield while achieving continuous and stable operation, reducing energy consumption, and simplifying maintenance procedures has become a pressing technical challenge for the industry. Utility Model Content

[0004] Purpose of the utility model: To overcome the above shortcomings, the purpose of this utility model is to provide a continuous acetone recovery distillation device. It employs a shell-and-tube preheating condenser, utilizing the waste heat from the recovery vessel wastewater to preheat the raw material, reducing external energy input. The distillation column adopts a segmented structure, filled with high-efficiency packing to enhance mass transfer efficiency. The control system links the feed and discharge, maintaining dynamic material balance and ensuring continuous operation. These design features work synergistically to overcome the problems of insufficient adaptability, high energy consumption, and complex operation and maintenance of traditional devices.

[0005] Technical Solution: This utility model provides a continuous acetone recovery distillation device comprising: a recovery vessel, which is a container structure with a steam heating coil and a wastewater outlet at its bottom; a distillation column, which includes a first column section and a second column section, arranged vertically above the recovery vessel and connected by a flange, with a feed inlet on the first column section; a shell-and-tube preheating condenser, the tube side inlet of which is connected to the wastewater outlet of the recovery vessel, and the tube side outlet connected to an intermediate water tank; the shell side inlet of which is the feed inlet, and the shell side outlet connected to the feed inlet of the distillation column via a preheating pipeline; a top condenser and an acetone receiving tank, the inlet of which is connected to the top of the distillation column, and the outlet of which is connected to the acetone receiving tank; and a water-acetone tank connected to the feed inlet. The shell-and-tube preheating condenser uses countercurrent heat exchange between wastewater and raw materials (the tube side receives high-temperature wastewater from the recovery vessel, and the shell side receives the raw materials to be processed) to preheat the raw materials to the process temperature, replacing independent heaters and reducing energy consumption. The water-acetone tank serves as a raw material buffer unit, stabilizing the feed flow rate and concentration and avoiding fluctuations in the distillation column's operating conditions. The steam coil at the bottom of the recovery vessel provides a stable heat source, keeping the materials inside boiling and continuously generating acetone vapor for separation in the distillation column. The distillation column, with its double-section flange connection, forms a multi-stage separation space, ensuring full contact between the rising steam and the falling liquid, achieving efficient separation of acetone and water. The condenser at the top of the column condenses the acetone vapor into liquid, which is then collected in an acetone receiving tank for product recovery. The condensation efficiency directly determines the recovery rate. The high-temperature wastewater discharged from the recovery vessel is collected in an intermediate water tank after being heated by the preheating condenser, reducing energy consumption for subsequent wastewater treatment. Ultimately, a closed loop is formed, encompassing raw material supply, preheating, distillation, product collection, and waste liquid discharge, eliminating the need for intermittent start-up and shutdown operations.

[0006] Furthermore, in this application, a continuous acetone recovery distillation apparatus is provided, wherein the recovery vessel is made of enamel and has a volume of 5000L. The inert surface of the enamel can resist corrosion from acetone aqueous solution and trace amounts of acidic and alkaline impurities during distillation, preventing the leaching of metal ions from the vessel body and ensuring that the purity of the recovered acetone is not contaminated by the vessel body material. The enamel layer is heat-resistant and has a smooth, non-stick surface, which can reduce material residue in the vessel and facilitate quick cleaning during shutdown maintenance.

[0007] Furthermore, in the continuous acetone recovery distillation apparatus of this application, the nominal diameter of the distillation column is Φ500mm, the first and second column sections are both made of 304 stainless steel, and the height of each column section is 3m. 304 stainless steel is resistant to corrosion from acetone vapor and trace acidic impurities, making it suitable for long-term distillation operations.

[0008] Furthermore, in the continuous acetone recovery distillation apparatus of this application, the operating pressure range of the steam heating coil is 0.3-0.5 MPa, and the steam heating coil is used to maintain the temperature inside the recovery vessel at 100±2℃. This pressure range is compatible with the heat resistance limit of the enamel-lined recovery vessel. The temperature control range of 100±2℃ ensures that the aqueous phase inside the vessel remains in a near-boiling state.

[0009] Furthermore, in this application, a continuous acetone recovery distillation apparatus is provided, wherein the distillation column is filled with wire mesh stainless steel packing, and the packing height in the first and second column sections is 2.8m. The wire mesh stainless steel packing is made of the same material as the 304 stainless steel column sections, which can withstand corrosion from acetone vapor and trace amounts of acetic acid impurities, thereby improving mass transfer efficiency.

[0010] Furthermore, the continuous acetone recovery distillation apparatus of this application also includes a control system, which includes a feed pump (not shown) and discharge valves (not shown) respectively located at the top of the column and the bottom of the vessel. The feed pump is linked with the two discharge valves to maintain the material balance within the apparatus.

[0011] As can be seen from the above technical solution, this utility model has the following beneficial effects: 1. The continuous acetone recovery distillation device of this utility model utilizes the "wastewater-raw material" countercurrent heat exchange design of the shell-and-tube preheating condenser to efficiently utilize the waste heat of the high-temperature wastewater discharged from the recovery vessel to preheat the raw material to be treated, replacing the traditional independent heater. This not only reduces the input consumption of external energy but also lowers the energy consumption of subsequent high-temperature wastewater treatment, realizing the recycling of energy and significantly improving the energy efficiency of the device.

[0012] 2. The continuous acetone recovery distillation device of this utility model enhances the mass transfer and separation efficiency of acetone and water by using a segmented distillation column with wire mesh stainless steel high-efficiency packing, ensuring the purity and yield of the recovered acetone. At the same time, the control system links the feed pump and the inlet and outlet valves to maintain the dynamic balance of materials in the device, realizing continuous and stable acetone recovery operation. Furthermore, the segmented flange connection design and the selection of corrosion-resistant materials simplify the maintenance process of the device and effectively overcome the problems of insufficient adaptability and complex operation and maintenance of traditional devices. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the distillation apparatus for continuous acetone recovery according to the present invention.

[0014] Explanation of reference numerals on the accompanying drawings: 1-Recovery vessel, 11-Steam heating coil, 12-Wastewater outlet; 2-Distillation column, 21-First column section, 22-Second column section, 23-Feed inlet; 3-Shell-tube preheating condenser, 31-Raw material inlet, 32-Preheating pipeline; 4-Top condenser; 5-Acetone receiving tank; 6-Intermediate water tank; 7-Acetone-water container. Detailed Implementation

[0015] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

[0016] Example 1 like Figure 1 The distillation apparatus for continuous acetone recovery shown includes a recovery vessel 1, a distillation column 2, a shell-and-tube preheating condenser 3, a column top condenser 4, an acetone receiving tank 5, an intermediate water tank 6, and a water-acetone tank 7.

[0017] The recovery vessel 1 is made of enamel and has a volume of 5000L. It is equipped with a steam heating coil 11 and a wastewater outlet 12 at the bottom. The working pressure range of the steam heating coil 11 is 0.3-0.5MPa, which is used to maintain the temperature inside the recovery vessel 1 at 100±2℃.

[0018] The distillation column 2 consists of a first column section 21 and a second column section 22 connected by flanges, and is vertically arranged above the recovery vessel 1. The nominal diameter of the distillation column 2 is Φ500mm. Both the first column section 21 and the second column section 22 are made of 304 stainless steel, and the height of each column section is 3m. The distillation column 2 has a feed inlet 23 on the first column section 21. The distillation column 2 is filled with wire mesh stainless steel packing, and the packing height in both the first column section 21 and the second column section 22 is 2.8m.

[0019] The tube-side inlet of the shell-and-tube preheating condenser 3 is connected to the wastewater outlet 12 of the recovery vessel 1, and the tube-side outlet is connected to an intermediate water tank 6. The shell-side inlet of the shell-and-tube preheating condenser 3 is the raw material inlet 31, and the shell-side outlet is connected to the feed inlet 23 of the distillation column 2 through the preheating pipeline 32.

[0020] The inlet of the top condenser 4 is connected to the top of the distillation column 2, and the outlet is connected to the acetone receiving tank 5.

[0021] The water-acetone tank 7 is connected to the raw material inlet 31 and is used to store and supply acetone-containing raw materials to be processed.

[0022] The device also includes a control system, which includes a feed pump (not shown) and discharge valves (not shown) located at the top of the tower and the bottom of the vessel, respectively. The feed pump is linked with the two discharge valves to maintain the material balance within the device and ensure continuous and stable operation.

[0023] During operation, acetone-containing feedstock enters the shell side of the shell-and-tube preheating condenser 3 from the water-acetone tank 7 through feedstock inlet 31, where it undergoes countercurrent heat exchange with high-temperature wastewater discharged from the wastewater outlet 12 of the recovery vessel 1 in the tube side. After preheating, the feedstock enters the distillation column 2 through the feed inlet 23 via the preheating pipeline 32. In the distillation column 2, the feedstock contacts the rising vapor, undergoing mass transfer separation. The acetone vapor rises to the top of the column and enters the top condenser 4, where it is condensed into liquid acetone and flows into the acetone receiving tank 5 for collection. The wastewater from the recovery vessel 1 enters the tube side of the shell-and-tube preheating condenser 3 through the wastewater outlet 12, releasing heat before flowing into the intermediate water tank 6, thus achieving waste heat recovery and energy consumption reduction. The control system dynamically adjusts the feed and discharge flow rates by linking the feed pump and discharge valve to maintain material balance and achieve continuous acetone recovery operation.

[0024] This embodiment achieves continuous acetone recovery through the energy recycling of the shell-and-tube preheating condenser, the efficient mass transfer design of the distillation column, and the automatic linkage of the control system. It has the advantages of energy saving, high separation efficiency, and simple operation and maintenance.

[0025] The above embodiments are exemplary and are intended to illustrate the technical concept and features of this utility model, so that those skilled in the art can understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A distillation apparatus for continuous acetone recovery, characterized in that: include: The recovery vessel (1) is a container structure with a steam heating coil (11) and a wastewater outlet (12) at its bottom. The distillation column (2) includes a first column section (21) and a second column section (22). The first column section (21) and the second column section (22) are arranged vertically above the recovery vessel (1) in sequence. The first column section (21) and the second column section (22) are connected by a flange. The distillation column (2) has a feed inlet (23) on the first column section (21). The shell-and-tube preheating condenser (3) has its tube side inlet connected to the wastewater outlet (12) of the recovery vessel (1), and its tube side outlet connected to an intermediate water tank (6); the shell side inlet of the preheating condenser (3) is the raw material inlet (31), and its shell side outlet is connected to the feed inlet (23) of the distillation column (2) through a preheating pipeline (32). The column top condenser (4) and the acetone receiving tank (5) are connected. The inlet of the column top condenser (4) is connected to the top of the distillation column (2), and the outlet is connected to the acetone receiving tank (5). A water acetone tank (7) is connected to the raw material inlet (31).

2. The distillation apparatus for continuous acetone recovery according to claim 1, characterized in that: The recycling vessel (1) is made of enamel and has a volume of 5000L.

3. The distillation apparatus for continuous acetone recovery according to claim 2, characterized in that: The nominal diameter of the distillation column (2) is Φ500mm. The first column section (21) and the second column section (22) are both made of 304 stainless steel, and the height of each column section is 3m.

4. The distillation apparatus for continuous acetone recovery according to claim 3, characterized in that: The working pressure range of the steam heating coil (11) is 0.3-0.5MPa, and the steam heating coil (11) is used to maintain the temperature inside the recovery vessel (1) at 100±2℃.

5. The distillation apparatus for continuous acetone recovery according to claim 4, characterized in that: The distillation column (2) is filled with wire mesh stainless steel packing, and the packing height in the first column section (21) and the second column section (22) is 2.8m.

6. The distillation apparatus for continuous acetone recovery according to claim 5, characterized in that: It also includes a control system, which includes a feed pump and discharge valves located at the top of the tower and the bottom of the vessel, respectively. The feed pump is linked with the two discharge valves to maintain the material balance within the device.

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