Purification device for chloroacetaldehyde production

Abstract

The utility model relates to the technical field of chemical equipment, in particular to a purification device for chloroacetaldehyde production, which comprises a rectifying tower, an emptying port of the rectifying tower is communicated with a vacuum condensing device, a condensate outlet of the vacuum condensing device is communicated with a chloroacetaldehyde buffer tank, a chloroacetaldehyde storage tank and a buffer tank, and an outlet of the chloroacetaldehyde buffer tank is communicated with a reflux port of the rectifying tower; a preheating chamber, a heating chamber and a separation chamber which are communicated with one another are arranged in the rectifying tower from bottom to top, a preheating part is arranged outside the preheating chamber, a heating part is arranged in the heating chamber, and a separation part is arranged in the separation chamber. The purification device is reasonable in design, effective separation of chloroacetaldehyde, byproducts and unreacted materials is realized, the purity of chloroacetaldehyde is greatly improved, and the requirements of customers are met.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical equipment, in particular to a purification device for chloroacetaldehyde production. Background Art

[0002] Chloroacetaldehyde is the main raw material for synthesizing dithiane. Currently, there are three main methods for preparing chloroacetaldehyde, namely, acetaldehyde chlorination method, vinyl chloride chlorination method and ethyl acetate chlorination hydrolysis method. When the vinyl chloride chlorination method is used for preparation, the raw materials are not fully reacted, resulting in the chloroacetaldehyde obtained containing unreacted raw materials and by-products. The purity of chloroacetaldehyde is low and cannot meet customer needs. The prior art uses a distillation kettle for distillation, and then separates the unreacted raw materials, by-products and chloroacetaldehyde. However, when using a distillation kettle for distillation, there are the following problems: the feed liquid inside the distillation kettle is heated by a stirring component and heated by a jacket, but the distillation kettle of the above structure has uneven heating of the feed liquid inside, low separation efficiency, and poor separation effect, which ultimately affects the yield and purity of the product; therefore, in view of the above technical problems, it is necessary to design a purification device for chloroacetaldehyde production. Utility Model Content

[0003] The technical problem to be solved by the utility model is: in view of the deficiencies of the prior art, a purification device for producing chloroacetaldehyde is provided, and the purity of chloroacetaldehyde is greatly improved by using the purification device.

[0004] In order to solve the above technical problems, the technical solution of the utility model is:

[0005] A purification device for chloroacetaldehyde production comprises a distillation tower, wherein the emptying port of the distillation tower is connected to a vacuum condensing device, the condensate outlet of the vacuum condensing device is connected to a chloroacetaldehyde buffer tank, a chloroacetaldehyde storage tank and a buffer tank, and the outlet of the chloroacetaldehyde buffer tank is connected to the reflux port of the distillation tower; the interior of the distillation tower is provided with a preheating chamber, a heating chamber and a separation chamber which are interconnected from bottom to top, the outside of the preheating chamber is provided with a preheating component, the inside of the heating chamber is provided with a heating component, and the inside of the separation chamber is provided with a separation component; the center of the distillation tower is provided with a rotating shaft, the rotating shaft passes through the separation chamber, the heating chamber and the preheating chamber, one end of the rotating shaft is connected to a motor, a first stirring component is provided on the rotating shaft in the preheating chamber, and a second stirring component and a third stirring component are provided on the rotating shaft in the heating chamber.

[0006] As an improved technical solution, the chloroacetaldehyde buffer tank is connected to the reflux port of the distillation tower through a reflux pipe and a reflux pump, a flow meter is provided on the reflux pipe, and the flow meter is electrically connected to a controller.

[0007] As an improved technical solution, the vacuum condensation device includes a first condenser, the uncondensed gas outlet of the first condenser is connected to the second condenser, the uncondensed gas outlet of the second condenser is connected to the buffer tank, the exhaust port of the buffer tank is connected to the vacuum pump, and the condensate outlets of the first condenser and the second condenser are both connected to the chloroacetaldehyde buffer tank and the chloroacetaldehyde storage tank.

[0008] As an improved technical solution, the preheating component is a jacket arranged on the outer wall of the preheating chamber.

[0009] As an improved technical solution, the heating component includes a first heating coil and a second heating coil, a second stirring component is provided above the first heating coil, and a third stirring component is provided between the first heating coil and the second heating coil.

[0010] As an improved technical solution, the second stirring component includes a fixed sleeve, which is provided with a trapezoidal or fan-shaped stirring plate, and the stirring plate is provided with a plurality of stirring teeth; the third stirring component includes a fixed sleeve, which is provided with a plurality of stirring rods, and the stirring rods are provided with a plurality of spiral blades.

[0011] As an improved technical solution, the first stirring component includes an inner stirring frame and an outer stirring frame of an integrated structure, and a plurality of stirring rods are respectively provided on the inner stirring frame and the outer stirring frame.

[0012] As an improved technical solution, the separation component is a baffle plate arranged on the inner wall of the separation chamber, and the baffle plate is provided with a plurality of through holes.

[0013] After adopting the above technical solution, the beneficial effects of the utility model are:

[0014] The purification device for chloroacetaldehyde production includes a distillation tower, an emptying port of the distillation tower is connected to a vacuum condensing device, a condensate outlet of the vacuum condensing device is connected to a chloroacetaldehyde buffer tank, a chloroacetaldehyde storage tank and a buffer tank, and an outlet of the chloroacetaldehyde buffer tank is connected to a reflux port of the distillation tower; the interior of the distillation tower is provided with a preheating chamber, a heating chamber and a separation chamber which are interconnected from bottom to top, a preheating component is provided outside the preheating chamber, a heating component is provided inside the heating chamber, and a separation component is provided inside the separation chamber; a rotating shaft is provided at the center of the distillation tower, the rotating shaft passes through the separation chamber, the heating chamber and the preheating chamber, one end of the rotating shaft is connected to a motor, a first stirring component is provided on the rotating shaft in the preheating chamber, and a second stirring component and a third stirring component are provided on the rotating shaft in the heating chamber. In actual production, the chloroacetaldehyde feed liquid containing unreacted materials and by-products enters the preheating chamber of the distillation tower, is preheated by the preheating component, and then enters the heating chamber. After being heated by the heating component, the motor operation drives the rotating shaft to rotate during preheating and heating. The first stirring component, the second stirring component and the third stirring component work together to stir the feed liquid so that the feed liquid is evenly heated. As the heating proceeds, the unreacted materials are evaporated and enter the interior of the separation chamber. After separation by the separation component, the feed liquid can be prevented from entering the interior of the vacuum condensing device. The evaporated unreacted materials are condensed by the vacuum cooling device and then enter the buffer tank. Then the chloroacetaldehyde is evaporated and continues to enter the interior of the condensing device for condensation. The condensed chloroacetaldehyde first enters the chloroacetaldehyde buffer tank, and then flows back into the interior of the distillation tower for continued distillation, and then enters the interior of the vacuum condensing device for condensation, and finally stored through the chloroacetaldehyde storage tank. The by-products inside the distillation tower are discharged from the by-product outlet on one side. The above-mentioned purification device is reasonably designed, realizes the effective separation of chloroacetaldehyde and by-products and unreacted materials, greatly improves the purity of chloroacetaldehyde, and meets the needs of customers.

[0015] Since the chloroacetaldehyde buffer tank is connected to the reflux port of the distillation tower through a reflux pipe and a reflux pump, a flow meter is provided on the reflux pipe, and the flow meter is electrically connected to the controller. Under the action of the reflux pump, the chloroacetaldehyde in the chloroacetaldehyde buffer tank enters the interior of the distillation tower from the reflux port along the reflux pipe, and the flow entering the interior of the distillation kettle is controlled by the controller and the flow meter to continue distillation. The above design is reasonable and convenient for transporting the chloroacetaldehyde in the chloroacetaldehyde buffer tank to the distillation tower for re-distillation.

[0016] Since the vacuum condensing device includes a first condenser, the uncondensed gas outlet of the first condenser is connected to the second condenser, the uncondensed gas outlet of the second condenser is connected to the buffer tank, the emptying port of the buffer tank is connected to the vacuum pump, and the condensate outlets of the first condenser and the second condenser are connected to the chloroacetaldehyde buffer tank, the chloroacetaldehyde storage tank and the buffer tank. Unreacted raw materials are first steamed out, and under the action of the vacuum pump, they first enter the interior of the first condenser for condensation, and then the uncondensed ones enter the second condenser for condensation, and the condensed raw materials enter the buffer tank for storage; then chloroacetaldehyde is steamed out, first enters the interior of the first condenser for condensation, and the uncondensed ones enter the second condenser for condensation, and the condensed chloroacetaldehyde first enters the chloroacetaldehyde buffer tank, and then flows back into the interior of the distillation kettle to continue distillation, and enters the chloroacetaldehyde storage tank after condensation. The above-mentioned vacuum condensing device is reasonably designed to achieve the distillation and separation of chloroacetaldehyde and unreacted materials.

[0017] Since the preheating component is a jacket arranged on the outer wall of the preheating chamber, the heat medium of the jacket is used to heat the liquid in the preheating chamber. The preheating component has a simple structure and a reasonable design, and realizes the preheating of the liquid to be purified.

[0018] Since the heating component includes a first heating coil and a second heating coil, a second stirring component is provided above the first heating coil, and a third stirring component is provided between the first heating coil and the second heating coil. The heat medium inside the first heating coil and the heat medium inside the second heating coil heat the feed liquid, and the second stirring component and the third stirring component stir and mix the feed liquid. The above design is reasonable and convenient for stirring, mixing and distilling the feed liquid to be purified.

[0019] Since the second stirring component includes a fixed sleeve, a trapezoidal or fan-shaped stirring plate is provided on the fixed sleeve, and a plurality of stirring teeth are provided on the stirring plate; and the third stirring component includes a fixed sleeve, a plurality of stirring rods are provided on the fixed sleeve, and a plurality of spiral blades are provided on the stirring rods. After the motor is started, the rotating shaft is driven to rotate, and the stirring rod and the plurality of stirring teeth on the second stirring component, and the plurality of stirring rods and spiral blades on the third stirring component cooperate to stir the feed liquid to be purified, so that the feed liquid is evenly heated, which is convenient for the unreacted materials and chloroacetaldehyde to be evaporated.

[0020] Since the first stirring component includes an inner stirring frame and an outer stirring frame of an integral structure, and a plurality of stirring rods are respectively provided on the inner stirring frame and the outer stirring frame, the motor drives the rotating shaft to rotate after starting, and the inner and outer stirring frames and the plurality of stirring rods cooperate to stir the feed liquid, so that the feed liquid is evenly heated, and it is convenient to evaporate the unreacted materials and chloroacetaldehyde in the feed liquid.

[0021] Since the separation component is a baffle plate arranged on the inner wall of the separation chamber, and a plurality of through holes are arranged on the baffle plate, the unreacted material will carry part of the liquid material upward after being evaporated, and after entering the separation chamber, it will contact the baffle plate inside the separation chamber, and the liquid material will flow back into the heating chamber along the baffle plate, and the material vapor will pass through the through holes and enter the interior of the vacuum condensation device for condensation. The separation component of the above structure is reasonably designed to prevent the unreacted material from carrying the liquid material into the interior of the vacuum condensation device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of a purification device for producing chloroacetaldehyde according to the utility model;

[0023] Among them, 1-distillation tower, 10-preheating chamber, 100-preheating component, 11-heating chamber, 110-heating component, 1100-first heating coil, 1101-second heating coil, 12-separation chamber, 120-separation component, 2-vacuum condensing device, 20-first condenser, 21-second condenser, 22-buffer tank, 23-vacuum pump, 3-chloroacetaldehyde buffer tank, 4-chloroacetaldehyde storage tank, 5-buffer tank, 6-rotating shaft, 61-first stirring component, 610-inner stirring frame, 611-outer stirring frame, 612-stirring rod, 62-second stirring component, 620-fixed sleeve, 621-stirring plate, 622-stirring teeth, 63-third stirring component, 630-stirring rod, 631-spiral blade, 7-motor, 8-reflux pipe, 80-flow meter, 9-reflux pump, 13-controller. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0025] A purification device for the production of chloroacetaldehyde, such as Figure 1 As shown, it includes a distillation tower 1, the emptying port of the distillation tower 1 is connected to the vacuum condensing device 2, the condensate outlet of the vacuum condensing device 2 is connected to the chloroacetaldehyde buffer tank 3, the chloroacetaldehyde storage tank 4 and the buffer tank 5, and the outlet of the chloroacetaldehyde buffer tank 4 is connected to the reflux port of the distillation tower 11; the interior of the distillation tower 1 is provided with a preheating chamber 10, a heating chamber 11 and a separation chamber 12 which are interconnected from bottom to top, the outside of the preheating chamber 10 is provided with a preheating component 100, the inside of the heating chamber 11 is provided with a heating component 110, and the inside of the separation chamber 12 is provided with a separation component 120; the center of the distillation tower 1 is provided with a rotating shaft 6, the rotating shaft 6 passes through the separation chamber 10, the heating chamber 11 and the preheating chamber 12, one end of the rotating shaft 6 is connected to the motor 7, the rotating shaft 6 located in the preheating chamber 10 is provided with a first stirring component 60, and the rotating shaft 6 located in the heating chamber 11 is provided with a second stirring component 61 and a third stirring component 62.

[0026] In actual production, the chloroacetaldehyde feed liquid containing unreacted materials and by-products enters the preheating chamber of the distillation tower, is preheated by the preheating component, and then enters the heating chamber. After being heated by the heating component, the motor operation drives the rotating shaft to rotate during preheating and heating. The first stirring component, the second stirring component and the third stirring component work together to stir the feed liquid so that the feed liquid is evenly heated. As the heating proceeds, the unreacted materials are evaporated and enter the interior of the separation chamber. After separation by the separation component, the feed liquid can be prevented from entering the interior of the vacuum condensing device. The evaporated unreacted materials are condensed by the vacuum cooling device and then enter the buffer tank. Then the chloroacetaldehyde is evaporated and continues to enter the interior of the condensing device for condensation. The condensed chloroacetaldehyde first enters the chloroacetaldehyde buffer tank, and then flows back into the interior of the distillation tower for continued distillation, and then enters the interior of the vacuum condensing device for condensation, and finally stored through the chloroacetaldehyde storage tank. The by-products inside the distillation tower are discharged from the by-product outlet on one side. The above-mentioned purification device is reasonably designed, realizes the effective separation of chloroacetaldehyde and by-products and unreacted materials, greatly improves the purity of chloroacetaldehyde, and meets the needs of customers.

[0027] The chloroacetaldehyde buffer tank 3 is connected to the reflux port of the distillation tower 1 through a reflux pipe 8 and a reflux pump 9. A flow meter 80 is provided on the reflux pipe 8, and the flow meter 80 is electrically connected to the controller 13. Under the action of the reflux pump, the chloroacetaldehyde in the chloroacetaldehyde buffer tank enters the interior of the distillation tower from the reflux port along the reflux pipe, and the flow rate entering the distillation kettle is controlled by the controller and the flow meter to continue distillation.

[0028] Wherein the vacuum condensing device 2 comprises a first condenser 20, the uncondensed gas outlet of the first condenser 20 is connected to the second condenser 21, the uncondensed gas outlet of the second condenser 21 is connected to the buffer tank 22, the emptying port of the buffer tank 22 is connected to the vacuum pump 23, and the condensate outlets of the first condenser 20 and the second condenser 21 are all connected to the chloroacetaldehyde buffer tank 3, the chloroacetaldehyde storage tank 4 and the buffer tank 5. Unreacted raw materials are first steamed out, and under the action of the vacuum pump, they first enter the interior of the first condenser for condensation, and then the uncondensed ones enter the second condenser for condensation, and the condensed raw materials enter the buffer tank for storage; then chloroacetaldehyde is steamed out, first enters the interior of the first condenser for condensation, and the uncondensed ones enter the second condenser for condensation, and the condensed chloroacetaldehyde first enters the chloroacetaldehyde buffer tank, and then flows back into the interior of the distillation kettle to continue distillation, and enters the chloroacetaldehyde storage tank after condensation. The above-mentioned vacuum condensing device is reasonably designed, and the distillation and separation of chloroacetaldehyde and unreacted materials are realized.

[0029] The preheating component 100 is a jacket disposed on the outer wall of the preheating chamber. The heat medium of the jacket is used to heat the liquid in the preheating chamber. The preheating component has a simple structure and a reasonable design, and realizes the preheating of the liquid to be purified.

[0030] The heating component 110 includes a first heating coil 1100 and a second heating coil 1101, a second stirring component 62 is provided above the first heating coil 1100, and a third stirring component 63 is provided between the first heating coil 1100 and the second heating coil 1101. The heat medium inside the first heating coil and the heat medium inside the second heating coil heat the feed liquid, and the second stirring component and the third stirring component stir and mix the feed liquid. The above design is reasonable and convenient for stirring, mixing and distilling the feed liquid to be purified.

[0031] The second stirring member 62 includes a fixed sleeve 620, on which a trapezoidal or fan-shaped stirring plate 621 is provided, and on which a plurality of stirring teeth 622 are provided; the third stirring member 63 includes a fixed sleeve, on which a plurality of stirring rods 630 are provided, and on which a plurality of spiral blades 631 are provided. After the motor is started, the rotating shaft is driven to rotate, and the stirring rod and the plurality of stirring teeth on the second stirring member, and the plurality of stirring rods and spiral blades on the third stirring member cooperate to stir the feed liquid to be purified, so that the feed liquid is evenly heated, which is convenient for the unreacted materials and chloroacetaldehyde to be evaporated.

[0032] The first stirring member 61 includes an inner stirring frame 610 and an outer stirring frame 611 of an integrated structure, and a plurality of stirring rods 612 are respectively provided on the inner stirring frame 610 and the outer stirring frame 611. After the motor is started, the rotating shaft is driven to rotate, and the inner and outer stirring frames and the plurality of stirring rods cooperate to stir the feed liquid, so that the feed liquid is evenly heated, which facilitates the evaporation of unreacted materials and chloroacetaldehyde in the feed liquid.

[0033] The separation component 12 is a baffle plate arranged on the inner wall of the separation chamber, and a plurality of through holes are arranged on the baffle plate. After the unreacted material is evaporated, it will carry part of the liquid material upward, and after entering the separation chamber, it will contact the baffle plate inside the separation chamber. The liquid material will flow back into the heating chamber along the baffle plate, and the material vapor will pass through the through holes and enter the interior of the vacuum condensation device for condensation. The separation component of the above structure is reasonably designed to prevent the unreacted material from carrying the liquid material into the interior of the vacuum condensation device.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A purification device for chloroacetaldehyde production, characterized in that: The invention comprises a distillation tower, wherein the emptying port of the distillation tower is connected to a vacuum condensing device, the condensate outlet of the vacuum condensing device is connected to a chloroacetaldehyde buffer tank, a chloroacetaldehyde storage tank and a buffer tank, and the outlet of the chloroacetaldehyde buffer tank is connected to the reflux port of the distillation tower; the interior of the distillation tower is provided with a preheating chamber, a heating chamber and a separation chamber which are interconnected from bottom to top, the outside of the preheating chamber is provided with a preheating component, the inside of the heating chamber is provided with a heating component, and the inside of the separation chamber is provided with a separation component; a rotating shaft is provided at the center of the distillation tower, the rotating shaft passes through the separation chamber, the heating chamber and the preheating chamber, one end of the rotating shaft is connected to a motor, a first stirring component is provided on the rotating shaft in the preheating chamber, and a second stirring component and a third stirring component are provided on the rotating shaft in the heating chamber.

2. A purification device for chloroacetaldehyde production according to claim 1, characterized in that: The chloroacetaldehyde buffer tank is connected to the reflux port of the distillation tower through a reflux pipe and a reflux pump. A flow meter is provided on the reflux pipe, and the flow meter is electrically connected to a controller.

3. A purification device for chloroacetaldehyde production according to claim 1, characterized in that: The vacuum condensation device includes a first condenser, the uncondensed gas outlet of the first condenser is connected to the second condenser, the uncondensed gas outlet of the second condenser is connected to the buffer tank, the exhaust port of the buffer tank is connected to the vacuum pump, and the condensate outlets of the first condenser and the second condenser are both connected to the chloroacetaldehyde buffer tank and the chloroacetaldehyde storage tank.

4. A purification device for chloroacetaldehyde production according to claim 1, characterized in that: The preheating component is a jacket arranged on the outer wall of the preheating chamber.

5. A purification device for chloroacetaldehyde production according to claim 1, characterized in that: The heating component includes a first heating coil and a second heating coil. A second stirring component is disposed above the first heating coil. A third stirring component is disposed between the first heating coil and the second heating coil.

6. A purification device for chloroacetaldehyde production according to claim 1, characterized in that: The second stirring component comprises a fixed sleeve, on which a trapezoidal or fan-shaped stirring plate is disposed, and on which a plurality of stirring teeth are disposed; the third stirring component comprises a fixed sleeve, on which a plurality of stirring rods are disposed, and on which a plurality of spiral blades are disposed.

7. A purification device for chloroacetaldehyde production according to claim 1, characterized in that: The first stirring component comprises an inner stirring frame and an outer stirring frame of an integrated structure, and a plurality of stirring rods are respectively disposed on the inner stirring frame and the outer stirring frame.

8. A purification device for chloroacetaldehyde production according to claim 1, characterized in that: The separation component is a baffle plate arranged on the inner wall of the separation chamber, and a plurality of through holes are arranged on the baffle plate.

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