Ammonia recovery device
By designing an ammonia recovery device and utilizing components such as vacuum pumps, compressors, and distillation columns, the efficient recovery and purification of ammonia gas during the urea-to-cyclic carbonate production process was achieved, solving the problems of ammonia pollution and low purity, and providing high-purity liquid ammonia products.
Patent Information
- Application Number
- CN202422838767.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-19
- Publication Date
- 2025-11-18
- Estimated Expiration
- 2034-11-19
AI Technical Summary
In existing technologies, the ammonia gas generated during the urea process for preparing cyclic carbonates is directly emitted and pollutes the environment. Furthermore, the ammonia gas contains impurities, resulting in low purity of the recovered liquid ammonia, which cannot be effectively utilized.
An ammonia recovery device was designed, including components such as a vacuum pump, a compressor, a distillation column, a condenser, and a liquid ammonia tank. Ammonia gas is drawn in by the vacuum pump, compressed by the compressor, separated in the distillation column, condensed and recovered to the liquid ammonia tank, and impurities are removed and the purity is improved by gas-liquid separation and washing in a spray tower.
It achieves efficient recovery and purification of ammonia, with high purity liquid ammonia, simple operation, and easy utilization, solving the problems of ammonia pollution and low purity.
Smart Images
Figure CN223564589U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a chemical industry field, specifically, a kind of ammonia recovery device. BACKGROUND
[0002] When preparing cyclic carbonate by urea method, raw materials in the reaction kettle will produce ammonia gas in the reaction process, and ammonia gas directly discharged will pollute the environment, so it is necessary to recover ammonia gas.
[0003] In existing production, ammonia gas in the reaction kettle is usually extracted and then directly recovered. However, since water, organic matter and carbon dioxide and other impurities exist in ammonia gas, the purity of liquid ammonia is low after direct recovery, which is not convenient for subsequent use. Therefore, an ammonia recovery device capable of directly processing by-product ammonia gas in the reaction process into a product is needed. UTILITY MODEL CONTENT
[0004] The utility model aims to provide an ammonia recovery device, which can directly process ammonia gas into liquid ammonia, and the purity of liquid ammonia is high, which is convenient to use.
[0005] The utility model is implemented by the following technical solutions:
[0006] An ammonia recovery device includes a vacuum pump, a compressor connected to the vacuum pump, a rectifying tower connected to the compressor, a first condenser connected to the rectifying tower, and a liquid ammonia tank connected to the first condenser. A gas phase pipeline is connected to the vacuum pump. The outlet of the liquid ammonia tank is connected to the inside of the rectifying tower through a first pipeline. A second pipeline is arranged at the bottom of the rectifying tower.
[0007] Further, the ammonia recovery device further includes a reaction kettle, a second condenser and a gas-liquid separation tank connected in sequence. The gas phase outlet of the gas-liquid separation tank is connected to the gas phase pipeline.
[0008] Further, the liquid phase outlet of the gas-liquid separation tank is connected to the inside of the reaction kettle through a third pipeline.
[0009] Further, the vacuum pump and the outer surface of the gas phase pipeline are both provided with a heat preservation jacket.
[0010] Further, a spray tower is arranged on the gas phase pipeline. A washing liquid pipeline is connected to the upper part of the spray tower. A solution pipeline is connected to the bottom of the spray tower. A liquid storage tank is connected to the solution pipeline.
[0011] Further, a pump is arranged on the first pipeline. First and second valves are arranged at both ends of the pump. A fourth pipeline is further connected to the pump. A third valve is arranged on the fourth pipeline.
[0012] Further, the fourth valve is arranged on the second pipeline, and the second pipeline is communicated with the spray tower.
[0013] The technical scheme of the utility model has at least the following advantages and beneficial effects:
[0014] In the utility model, the ammonia is pumped by the vacuum pump, the ammonia is compressed by the compressor, the compressed ammonia and water are separated in the rectifying tower, the ammonia flows out from the top of the tower, flows to the liquid ammonia tank after being condensed by the first condenser, and the mixture of water and part of ammonia is discharged from the second pipeline at the bottom of the tower, so that the purity of the liquid ammonia can be improved. The reflux passage is formed between the liquid ammonia tank and the rectifying tower through the first pipeline, the gas-liquid separation effect in the rectifying tower can be improved, and the stability of the rectification is ensured. The reaction byproduct ammonia can be directly processed into liquid ammonia by using the system, the operation is simple and convenient, the purity of the liquid ammonia is high, and the liquid ammonia is convenient to use. BRIEF DESCRIPTION OF DRAWINGS
[0015] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiments, and it should be understood that the following drawings only show some embodiments of the utility model, and should not be regarded as limiting the scope, and for those skilled in the art, other related drawings can be obtained without creative labor on the premise of the drawings.
[0016] Figure 1 The structure diagram of the ammonia recovery device provided for the embodiment 1 of the utility model.
[0017] Icon: 1-vacuum pump, 2-compressor, 3-rectifying tower, 4-first condenser, 5-liquid ammonia tank, 6-first pipeline, 7-pump, 8-second pipeline, 9-first valve, 10-second valve, 11-fourth valve, 12-liquid storage tank, 13-fourth pipeline, 14-third valve, 15-reaction kettle, 16-second condenser, 17-gas-liquid separation tank, 18-third pipeline, 19-gas phase pipeline, 20-spray tower, 21-washing liquid pipeline, 22-solution pipeline. DETAILED DESCRIPTION
[0018] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model more clear, the following will combine the drawings in the embodiments of the utility model, and the technical scheme in the embodiments of the utility model is clearly and completely described, obviously, the described embodiments are a part of the embodiments of the utility model, not all the embodiments. The components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.
[0019] Therefore, the following detailed description of the embodiments of the application provided in the drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the application.
[0020] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.
[0021] In the description of the application, it should be explained that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, or the orientation or positional relationship of the product in use, it is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the application.
[0022] In the description of the application, it should also be explained that unless otherwise explicitly specified and limited, if the terms "set", "install", "connect", "connect" appear, they should be understood in a broad sense, for example, they can be fixedly connected, or they can be detachably connected, or integrally connected; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication between two elements inside. For those of ordinary skill in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.
[0023] Example 1
[0024] As Figure 1 shown, the present embodiment provides an ammonia recovery device, which comprises a vacuum pump 1, a compressor 2 connected with the vacuum pump 1, a rectifying tower 3 connected with the compressor 2, a first condenser 4 connected with the rectifying tower 3, and a liquid ammonia tank 5 connected with the first condenser 4; the vacuum pump 1 is connected with a gas phase pipeline 19, the outlet of the liquid ammonia tank 5 is communicated with the inside of the rectifying tower 3 through a first pipeline 6, and the bottom of the rectifying tower 3 is provided with a second pipeline 8.
[0025] The ammonia gas is pumped by the vacuum pump 1, compressed by the compressor 2, and separated in the rectifying tower 3, and the ammonia gas flows out from the top of the tower, condensed by the first condenser 4, and flows to the liquid ammonia tank 5, and the mixture of water and part of the ammonia is discharged from the second pipeline 8 at the bottom of the tower, so that the purity of the liquid ammonia can be improved. The first pipeline 6 between the liquid ammonia tank 5 and the rectifying tower 3 forms a reflux passage, so that the gas-liquid separation effect in the rectifying tower 3 can be improved, and the stability of the rectification can be ensured. The system can directly process the reaction byproduct ammonia gas into liquid ammonia, and the operation is simple and convenient, and the purity of the liquid ammonia is high, and the liquid ammonia is convenient to use.
[0026] In the embodiment, the ammonia recovery device further comprises a reaction kettle 15, a second condenser 16 and a gas-liquid separation tank 17 connected in sequence, and the gas phase outlet of the gas-liquid separation tank 17 is connected with the gas phase pipeline 19. The ammonia gas discharged from the reaction kettle 15 is first condensed by the second condenser 16, part of the impurities in the ammonia gas forms a liquid pool, and the liquid pool and the ammonia gas are separated in the gas-liquid separation tank 17, the ammonia gas is pumped from the gas phase outlet of the gas-liquid separation tank 17 to the vacuum pump 1 through the gas phase pipeline 19, and the liquid phase is stored in the gas-liquid separation tank 17.
[0027] In the embodiment, the liquid phase outlet of the gas-liquid separation tank 17 is communicated with the inside of the reaction kettle 15 through the third pipeline 18. The liquid phase enters the inside of the reaction kettle 15 from the liquid phase outlet of the gas-liquid separation tank 17 through the third pipeline 18, and continues to participate in the reaction in the reaction kettle 15, so that the utilization rate of the material can be improved.
[0028] In the embodiment, the outer surfaces of the vacuum pump 1 and the gas phase pipeline 19 are provided with heat preservation jackets. The heat preservation jackets are used to heat the vacuum pump 1 and the gas phase pipeline 19, so that the ammonia gas and the carbon dioxide cannot produce carbon ammonium crystallization to block the pipeline.
[0029] In the embodiment, the gas phase pipeline 19 is further provided with a spray tower 20, a washing liquid pipeline 21 is connected to the upper part of the spray tower 20, a solution pipeline 22 is connected to the bottom of the spray tower 20, and a liquid storage tank 12 is connected to the solution pipeline 22. The ammonia gas discharged from the gas-liquid separation tank 17 enters the spray tower 20, and the ammonia gas is washed and removed, so that the purity of the ammonia gas is improved. The washed ammonia gas is pumped from the top of the spray tower 20 to the vacuum pump 1, and the washed solution is discharged from the solution pipeline 22 to the liquid storage tank 12.
[0030] In the embodiment, the first pipeline 6 is provided with a pump 7, the two ends of the pump 7 are respectively provided with a first valve 9 and a second valve 10, the pump 7 is further connected with a fourth pipeline 13, and the fourth pipeline 13 is provided with a third valve 14. The first valve 9, the second valve 10 and the pump 7 cooperate to adjust the reflux of the first pipeline 6. The first valve 9, the third valve 14 and the fourth pipeline 13 cooperate to discharge the liquid ammonia in the liquid ammonia tank 5.
[0031] In the embodiment, the second pipeline 8 is provided with a fourth valve 11, and the second pipeline 8 is communicated with the spray tower 20. The mixture of water and ammonia separated from the rectifying tower 3 is discharged from the second pipeline 8 and sent back to the spray tower 20 to participate in elution.
[0032] The working principle of the ammonia recovery device is that ammonia gas from the reaction kettle 15 is condensed by the second condenser 16 and then enters the gas-liquid separation tank 17, the ammonia gas separated by the gas-liquid separation tank 17 enters the spray tower 20 and is eluted in the spray tower 20, in the elution process, carbon dioxide, ammonia gas and water form a carbon ammonium aqueous solution, the saturated ammonia gas is sucked to the vacuum pump 1, is discharged from the outlet of the vacuum pump 1 and enters the compressor 2, the ammonia gas is compressed by the compressor 2, the compressed ammonia gas and water enter the rectifying tower 3 for rectification, the ammonia gas flows out from the top of the rectifying tower 3, is condensed by the first condenser 4 and then recovered to the liquid ammonia tank 5, and the mixture of water and ammonia is discharged from the second pipeline 8 at the bottom of the rectifying tower 3 and sent back to the spray tower 20 to participate in elution.
[0033] The above is only preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can be variously changed and modified. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. An ammonia recovery device, characterized in that: It includes a vacuum pump, a compressor connected to the vacuum pump, a distillation column connected to the compressor, a first condenser connected to the distillation column, and a liquid ammonia tank connected to the first condenser; the vacuum pump is connected to a gas phase pipeline, the outlet of the liquid ammonia tank is connected to the interior of the distillation column through the first pipeline, and a second pipeline is provided at the bottom of the distillation column.
2. The ammonia recovery device according to claim 1, characterized in that, The ammonia recovery device also includes a reaction vessel, a second condenser, and a gas-liquid separator connected in sequence, with the gas phase outlet of the gas-liquid separator connected to the gas phase pipeline.
3. The ammonia recovery device according to claim 2, characterized in that, The liquid phase outlet of the gas-liquid separator is connected to the interior of the reactor via a third pipeline.
4. The ammonia recovery device according to claim 2 or 3, characterized in that, Both the vacuum pump and the gas phase pipeline are provided with heat insulation jackets on their outer surfaces.
5. The ammonia recovery device according to claim 4, characterized in that, A spray tower is also installed on the gas phase pipeline. A washing liquid pipeline is connected to the upper part of the spray tower, and a solution pipeline is connected to the bottom of the spray tower. A liquid storage tank is connected to the solution pipeline.
6. The ammonia recovery device according to claim 1, characterized in that, A pump is installed on the first pipeline, and a first valve and a second valve are respectively installed at both ends of the pump. A fourth pipeline is also connected to the pump, and a third valve is installed on the fourth pipeline.
7. The ammonia recovery device according to claim 5, characterized in that, A fourth valve is installed on the second pipeline, and the second pipeline is connected to the spray tower.