Condenser device capable of preventing solidification

Abstract

The utility model provides an anti-solidification condenser device, and relates to the technical field of condenser devices. Comprising a rectifying tower and a condensation pipe communicated with the rectifying tower, a condensing coil is fixedly arranged in the pipe body and comprises a spiral pipe and a straight pipe, and the spiral pipe is communicated with the bottom of the straight pipe; the end of the spiral pipe is provided with a first outlet, and the end of the straight pipe is provided with a first inlet. The heat preservation jacket comprises an inner-layer jacket and an outer-layer jacket, the inner-layer jacket is tightly attached to the periphery of the pipe body, the outer-layer jacket wraps the periphery of the inner-layer jacket, a hollow structure is formed between the inner-layer jacket and the outer-layer jacket, a second inlet is formed in one side of the outer-layer jacket, and a second outlet is formed in the other side of the outer-layer jacket. The heat preservation jacket isolates the outside temperature, the circulating condensate can be heated and subjected to heat preservation through steam in a system subsequently, the initial set temperature of the heat preservation device is reduced, and energy consumption is reduced; and meanwhile, the problem that steam is condensed due to over-condensation through an inner-layer coil pipe of the condensation pipe is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of condenser devices, in particular to an anti-solidification condenser device. Background Art

[0002] The statements in this section merely provide background technical information related to the present invention and do not necessarily constitute prior art.

[0003] At present, the main process of N-vinyl caprolactam distillation is that the crude liquid N-vinyl caprolactam mixed with synthetic raw materials (caprolactam) is intermittently fed into the N-vinyl caprolactam distillation tower, and the N-vinyl caprolactam vapor obtained by distillation is liquefied through a condensing device to obtain a liquid product of high-purity N-vinyl caprolactam, and the residual liquid from the tower is collected from the tower and processed by a centralized treatment device. Under the existing experimental conditions, the experimental distillation cannot obtain good purity because the N-vinyl caprolactam vapor is easy to condense in the condensing device.

[0004] At present, the N-vinyl caprolactam distillation condensation device has the following problems:

[0005] 1. Since the condenser uses circulating water as the cooling medium, with a long period of cooling and heat exchange, N-vinyl caprolactam gas (NVCL) over-condenses at the bottom of the top coil of the tower, causing the material to solidify and scale into agglomerates and gradually enrich, resulting in a decrease in the condensation effect at the bottom of the coil. The N-vinyl caprolactam vapor cannot be completely condensed, causing part of the N-vinyl caprolactam vapor to escape from the distillation tower and be pumped away by the pump, reducing the heat exchange efficiency, resulting in an increase in the loss rate and affecting the experimental balance.

[0006] 2. There is a large amount of latent heat in the gas at the top of the tower, which wastes the waste heat of the gas at the top of the tower, requires a lot of energy for refrigeration and cooling, and increases energy consumption.

[0007] 3. The freezing point of N-vinyl caprolactam at room temperature is 38°C. Because the temperature at the top of the tower is too high, supercooling is required to completely cool it down, resulting in the temperature at the top of the tower being lower than the freezing temperature of the substance. Therefore, it often condenses on the top coil and everywhere, requiring a hot air blower to melt it, which greatly reduces the reflux efficiency, seriously affects the experimental balance, increases energy consumption, increases the number of experimental operation steps, and also has factors that affect the stability of the experimental system. Utility Model Content

[0008] The utility model aims to provide an anti-solidification condenser device to solve the problems existing in the prior art, improve energy utilization, prevent product solidification, and save distillation production costs.

[0009] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0010] The utility model provides an anti-freezing condenser device, comprising:

[0011] A distillation tower and a condenser connected thereto, wherein the condenser comprises a tube body, a heat-insulating jacket and a condenser coil;

[0012] The heat-insulating jacket is wrapped around the outer periphery of the tube body, and the condensing coil is fixedly arranged inside the tube body;

[0013] The heat-insulating jacket is a hollow structure, and the interior of the jacket is used to pass the preheated condensate.

[0014] According to a further technical solution, the condensing coil comprises a spiral tube and a straight tube, and the spiral tube and the straight tube are connected at the bottom.

[0015] According to a further technical solution, the straight tube is located on a line connecting the centers of the cross sections of the spiral tube.

[0016] According to a further technical solution, the spiral tube passes through a ground glass stopper and a glass cap, and a first inlet is provided at the top of the spiral tube.

[0017] According to a further technical solution, the straight tube passes through a ground glass stopper and a glass cap, and a first outlet is provided at the top of the straight tube.

[0018] According to a further technical solution, the thermal insulation jacket comprises an inner jacket and an outer jacket.

[0019] According to a further technical solution, the inner sleeve is in close contact with the outer circumference of the tube body, the outer sleeve is wrapped around the outer circumference of the inner sleeve, and a hollow structure is formed between the inner sleeve and the outer sleeve.

[0020] According to a further technical solution, a second inlet is provided on one side of the outer sleeve, and a second outlet is provided on the other side.

[0021] According to a further technical solution, the distillation tower is connected to the pipe body via a connecting pipe.

[0022] According to a further technical solution, the condensing coil is used to pass low-temperature condensate.

[0023] Compared with the prior art, the technical solution of the utility model has the following beneficial effects:

[0024] The utility model discloses a condenser tube heat preservation jacket at the top of the distillation tower, which utilizes the flow of warm heat medium and continuously heats and insulates the heat, thereby isolating the external temperature. After the steam in the system and the preheated condensate in the heat preservation jacket reach thermal equilibrium, the initial setting temperature of the heat preservation device can be lowered, thereby reducing energy consumption. At the same time, the utility model solves the problem that the steam is over-condensed through the inner coil of the condenser tube, causing the steam to solidify and adhere to the tower head, reducing reflux and affecting the experimental balance.

[0025] Advantages of additional aspects of the present invention will be partially given in the following description, and partially become apparent from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0027] Figure 1 It is a schematic diagram of the overall structure of the top condenser of the distillation tower of the utility model.

[0028] Figure 2 It is a schematic diagram of the condensing coil structure of the top condenser of the distillation tower of the utility model.

[0029] Figure 3 It is a schematic diagram of the structure of the insulation jacket of the top condenser of the distillation tower of the utility model.

[0030] Among them, 1. distillation tower, 2. tube body, 3. condensing coil, 31. first inlet, 32. first outlet, 301. spiral tube, 302. straight tube, 4. insulation jacket, 41. second inlet, 42. second outlet, 401. inner jacket, 402. outer jacket, 5. connecting pipe, 6. vacuum tube, 7. gas-liquid separator, 8. liquid collecting funnel, 9. diverter funnel, 10. ground glass stopper, 11. glass cap. DETAILED DESCRIPTION

[0031] It should be noted that the following detailed descriptions are exemplary and are intended to provide further description of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0032] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention.

[0033] In the present embodiment, N-vinyl caprolactam is used as an example. N-vinyl caprolactam is widely used in the chemical industry. It is an important synthetic material, which can be used as a monomer of a polymer, a catalyst of a polymerization reaction, a raw material of a surfactant and a plasticizer. It can also be used in the fields of coatings, inks, dyes and rubbers. N-vinyl caprolactam is widely used, and high-purity N-vinyl caprolactam has a large demand in the market, so it is necessary to carry out N-vinyl caprolactam rectification and purification. N-vinyl caprolactam has a melting point of 35-38°C under standard conditions, and a melting point of 20-24°C (from experimental data) under a negative pressure 1000P gas-liquid separator, so when the experimental environment temperature is lower than about 25, N-vinyl caprolactam will condense to form a solid, adhere to the inside of the experimental system, and then affect the experimental effect, result, product degree, etc.

[0034] like Figure 1 As shown, this embodiment discloses an anti-solidification condenser device, including a distillation tower 1 and a condenser pipe connected thereto, wherein the condenser pipe includes a pipe body 2, a condensation coil 3, and a heat-insulating jacket 4;

[0035] The heat-insulating jacket 4 is wrapped around the outer periphery of the tube body 2, and the condensing coil 3 is fixedly arranged inside the tube body 2; the heat-insulating jacket 4 is a hollow structure, and the interior thereof is used to pass the preheated condensate.

[0036] In some embodiments, the top of the tube body 2 is open, and the inner circumference of the opening edge is a frosted area within a certain distance downward, which is frosted; the condensing coil 3 is fixedly arranged inside the tube body 2 through a ground glass plug 10.

[0037] In some embodiments, Figure 2 As shown, the condensing coil 3 includes a spiral tube 301 and a straight tube 302, and the spiral tube 301 and the straight tube 302 are connected at the bottom; the spiral tube 301 passes through the ground glass plug 10 and the glass cap 11, and a first inlet 31 is provided at the top of the spiral tube 301, and the straight tube 302 passes through the ground glass plug 10 and the glass cap 11, and a first outlet 32 ​​is provided at the top of the straight tube 302. The straight tube 302 is located on the line connecting the centers of the cross sections of the spiral tube 301.

[0038] In some embodiments, the upper portion of the glass cap 11 is hemispherical, and the lower portion is cylindrical. The glass cap 11 is a hollow structure as a whole, and the bottom end of the glass cap 11 and the top end of the ground glass stopper 10 are an integral structure.

[0039] In some embodiments, the ground glass plug 10 can be inserted into the tube body 2 and tightly plugged with the frosted area to fix the condensing coil 3 and the tube body 2 while ensuring the sealing of the entire system.

[0040] In some embodiments, the ground glass plug 10 fixes the condensing coil 3 and the insulation jacket 4 in the same system; the ground glass plug 10 and the frosted area of ​​the tube body 2 are provided with vacuum silicone to ensure sealing and improve the vacuum effect.

[0041] like Figure 3 As shown, the thermal insulation jacket 4 includes an inner sleeve 401 and an outer sleeve 402. The inner sleeve 401 is tightly attached to the outer periphery of the tube body 2, and the outer sleeve 402 is wrapped around the outer periphery of the inner sleeve 401. A hollow structure is formed between the inner sleeve 401 and the outer sleeve 402. A second inlet 41 is opened on one side of the outer sleeve 402, and a second outlet 42 is opened on the other side.

[0042] In some embodiments, the distillation tower 1 can perform distillation separation on N-vinyl caprolactam rich in impurities to produce N-vinyl caprolactam vapor; the distillation tower 1 is connected to the tube body 2 through the connecting pipe 5, so that the N-vinyl caprolactam vapor separated by distillation enters the condenser tube body 2 through the connecting pipe 5;

[0043] In some embodiments, a gas-liquid separator 7, a liquid collecting funnel 8, and a diverting funnel 9 are sequentially arranged below the condensing coil 3;

[0044] In some embodiments, the gas-liquid separator 7 is used to separate the gas phase and the liquid phase. There is a small hole in the middle, which is a passage for the gas. The purpose is to prevent the material from boiling over during the experiment, causing the gas phase volume to increase suddenly, so that the liquid reflux is blocked by the gas and causes liquid flooding.

[0045] In some embodiments, the function of the liquid collecting funnel 8 is to collect the condensed liquid phase. The liquid phase dripping from the funnel can drip onto the center line of the tower column, so that the liquid can fully contact the filler and will not flow down the tower wall (to avoid the gas phase and liquid phase not being able to fully contact each other, resulting in impure products).

[0046] In some embodiments, a magnet is provided on one side of the diversion funnel 9, and the tilt of the funnel is controlled by an external electromagnet to achieve the purpose of reflux / extraction.

[0047] In some embodiments, the specific configuration of the gas-liquid separator 7, the liquid collecting funnel 8, and the diversion funnel 9 is prior art, and those skilled in the art can configure them according to actual needs, and this embodiment will not be elaborated on in detail.

[0048] In some embodiments, the condensing coil 3 is a cooling device, and a low-temperature condensate is introduced into the condensing coil 3 to reduce the temperature of the N-vinyl caprolactam vapor and condense the vapor into liquid reflux.

[0049] In some embodiments, the top end of the insulation jacket 4 is at a certain distance from the ground glass stopper 10 .

[0050] In some embodiments, the insulation jacket 4 is an insulation device, and the preheated condensate is passed into the insulation jacket 4 to keep warm and heat the N-vinyl caprolactam, prevent the N-vinyl caprolactam vapor from solidifying, melt the solidified N-vinyl caprolactam, and isolate the external environment temperature from affecting the condensation part of the experimental system.

[0051] In some embodiments, the first inlet 31 and the first outlet 32 ​​are connected to a first circulation pump, and the first circulation pump is used to pass the low-temperature condensate into the condensation coil 3 to achieve condensation of the material vapor.

[0052] In some embodiments, the second inlet 41 and the second outlet 42 are connected to a second circulation pump, and the second circulation pump is used to pass the preheated condensate into the hollow structure of the insulation jacket to prevent the material liquid from solidifying.

[0053] In some embodiments, the preheated condensate is heated by a water bath device, which is prior art and is not further limited in this embodiment.

[0054] In some embodiments, the first circulation pump and the second circulation pump may be a circulation pump device that works independently or two circulation pumps that work independently, as long as the desired effect of this embodiment can be achieved, and no excessive restrictions are imposed here.

[0055] In some embodiments, one side of the tube body 2 is connected to a vacuum tube 6, which is located vertically between the top of the insulation jacket 4 and the bottom of the ground glass stopper 10. The vacuum tube 6 is connected to a vacuum pumping device to perform vacuum treatment on the entire system.

[0056] In some embodiments, since the material vapor is discharged from the distillation tower 1, it is first condensed at the bottom of the condensing coil 3. Since the material vapor flows upward, there is a certain distance from the opening of the vacuum tube 6 on the tube body 2. Those skilled in the art can control and select the size of the condensing coil 3 and the insulation jacket 4 as needed to avoid the vacuum equipment from extracting the material vapor and causing unnecessary material loss.

[0057] In some embodiments, there is a certain distance between the bottom end of the insulation jacket 4 and the connecting pipe 5, and the tube body 2 of this part is a tapered opening structure that is wide at the top and narrow at the bottom, so that the N-vinyl caprolactam vapor can be condensed into liquid and then flow into the liquid collecting funnel 8.

[0058] In some embodiments, the tube body 2, the condensing coil 3, the insulation jacket 4, the connecting tube 5, the vacuum tube 6, the ground glass plug 10, and the glass cap 11 are all made of glass, or other suitable materials selected by technicians in this field according to actual needs.

[0059] In some embodiments, the temperature of the condenser is adjusted to suit the ambient temperature. After the experiment is stable, the heating temperature of the insulation jacket 4 in the condenser can be slowly reduced, and the heat carried by the steam in the system is used for insulation, thereby reducing energy consumption.

[0060] In some embodiments, the condensing coil 3 in the condenser can appropriately increase the condensing setting temperature after the experiment is stable, thereby reducing the overall energy consumption of the experiment.

[0061] In some embodiments, the preheated condensate enters through the first inlet 41 at the bottom of the insulation jacket 4, and is then discharged from the first outlet 42 at the top of the insulation jacket 4 after the liquid completely overflows the space in the jacket.

[0062] In some embodiments, the low-temperature condensate enters the straight tube 302 of the condensation coil 3 through the second inlet 31 , and then flows out through the spiral tube 301 of the condensation coil 3 through the second outlet 32 ​​.

[0063] In some embodiments, the smaller the temperature difference between the condensate in the condensing coil 3 and the insulation jacket 4 is, the more conducive it is to the experiment.

[0064] In some embodiments, there is a liquid diversion design at the bottom of the condensing coil 3. After the N-vinyl caprolactam vapor is condensed into liquid, it flows down along the spiral tube 301 and the straight tube 302 of the condensing coil 3 under the action of gravity, is enriched at the tail tip at the bottom of the spiral tube 301, and finally drips.

[0065] In some embodiments, low-temperature condensate (usually, the temperature is set to minus 18 degrees Celsius to minus 20 degrees Celsius, and can be gradually and appropriately reduced to minus 10 degrees Celsius to minus 15 degrees Celsius when subsequent experimental conditions are stable) is pumped into the condensing coil 3 through the first circulation pump to cool the experimental system normally.

[0066] In some embodiments, the preheated condensate (usually, the temperature is set to 28-32 degrees Celsius) is pumped into the insulation jacket 4 through the second circulation pump to insulate the experimental system to prevent the N-vinyl caprolactam at the top of the distillation tower 1 from solidifying.

[0067] In some embodiments, the condenser can be selected to have a condensation effect of minus fifteen degrees or below. The condenser is connected to the first circulation pump to achieve the transport of low-temperature condensate to a high position. A condenser of minus ten degrees can be used if the vacuum condition is good.

[0068] In some embodiments, the water bath device can be selected to have a heating effect of thirty degrees or above, and is connected to a second circulating pump to transport the preheated condensate to a high position; the condenser at the top of the distillation tower 1 needs to be designed with an inner condensation coil and an outer insulation jacket.

[0069] When the utility model is working: the material vapor generated by the distillation tower 1 containing impurities enters the tube body 2 of the condenser through the connecting pipe 5; the bottom of the condensing coil 3 is provided with a liquid diversion design, and after the material vapor is condensed into liquid, it flows down along the spiral tube 301 and the straight tube 302 of the condensing coil 3 under the action of gravity, is enriched at the tail tip of the bottom of the spiral tube 301, and finally drips.

[0070] Among them, the condensing coil 3 and the insulation jacket 4 of the condenser work synchronously, and the low-temperature condensate and the preheated condensate enter the condensing coil 3 and the insulation jacket 4 respectively through the first and second circulation pumps; specifically:

[0071] The preheated condensate (or water, the person skilled in the art selects a suitable condensate according to the experimental requirements) enters from the first inlet 41, and after the preheated condensate completely overflows the space of the hollow structure in the insulation jacket 4, it is discharged from the first outlet 42 to achieve the purpose of isolating the influence of the ambient temperature and ensuring that the top temperature of the distillation tower 1 is above the freezing point of the material. The temperature of the preheated condensate needs to be reasonably controlled according to the pressure of the experimental system combined with the freezing point of the steam or material (N-vinyl caprolactam) in the corresponding system.

[0072] The low-temperature condensate (or water, the person skilled in the art selects a suitable condensate according to the experimental requirements) enters the straight tube 302 of the condensation coil 3 from the second inlet 31, then flows through the spiral tube 301 of the condensation coil 3, and flows out through the second outlet 32 ​​to realize the liquefaction of N-vinyl caprolactam vapor. The temperature of the low-temperature condensate needs to be reasonably controlled according to the pressure of the experimental system combined with the liquefaction temperature of the steam or material (N-vinyl caprolactam) in the corresponding system.

[0073] The above technical solution can isolate the top temperature of the distillation tower 1 from the ambient temperature when the room temperature is lower than the solidification temperature of N-vinyl caprolactam vapor, thereby avoiding the problem of N-vinyl caprolactam solidification. The condensing coil 3 and the insulation jacket 4 can slowly adjust the temperature after the experimental balance is stable in order to achieve the purpose of minimum energy consumption.

[0074] Although the above describes the specific implementation methods of the utility model in combination with the accompanying drawings, it is not intended to limit the scope of protection of the utility model. Technical personnel in the relevant field should understand that on the basis of the technical solution of the utility model, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the utility model.

Claims

1. A condenser device for preventing solidification, characterized in that: It includes a distillation tower and a condenser connected thereto, wherein the condenser includes a tube body, a heat-insulating jacket, and a condenser coil; The heat-insulating jacket is wrapped around the outer periphery of the tube body, and the condensing coil is fixedly arranged inside the tube body; The heat-insulating jacket is a hollow structure, and the interior of the jacket is used to pass the preheated condensate.

2. The anti-freezing condenser device according to claim 1, characterized in that: The condensing coil comprises a spiral tube and a straight tube, and the bottoms of the spiral tube and the straight tube are connected.

3. The anti-freezing condenser device according to claim 2, characterized in that: The straight tube is located on the line connecting the centers of the cross sections of the spiral tube.

4. The anti-freezing condenser device according to claim 2, characterized in that: The spiral tube passes through a ground glass stopper and a glass cap, and a first inlet is arranged at the top of the spiral tube.

5. The anti-freezing condenser device according to claim 3, characterized in that: The straight tube passes through the ground glass stopper and the glass cap, and the top of the straight tube is provided with a first outlet.

6. The anti-freezing condenser device according to claim 1, characterized in that: The thermal insulation jacket comprises an inner jacket and an outer jacket.

7. The anti-freezing condenser device according to claim 6, characterized in that: The inner sleeve is closely attached to the outer circumference of the tube body, and the outer sleeve is wrapped around the outer circumference of the inner sleeve, so that a hollow structure is formed between the inner sleeve and the outer sleeve.

8. The anti-freezing condenser device according to claim 6, characterized in that: The outer sleeve has a second inlet on one side and a second outlet on the other side.

9. The anti-freezing condenser device according to claim 1, characterized in that: The distillation tower is connected with the pipe body through a connecting pipe.

10. The anti-freezing condenser device according to claim 1, characterized in that: The condensing coil is used to pass low-temperature condensate.

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