Self-control condensing equipment for recovering ammonia water in process of producing amino glycerol

Abstract

The utility model discloses self-control condensing equipment for recovering ammonia water in an amino glycerol production process. The first-stage air cooler and the second-stage air cooler are both arranged at the top of a plant, and a first temperature sensor is arranged on a pipeline of an air outlet of the distillation kettle; a first control valve is arranged on a pipeline of an air inlet of the first-stage air cooler, and a second control valve is arranged on a pipeline of an air inlet of the second-stage air cooler; the signal output end of the first temperature sensor is in signal connection with the signal input end of the controller, and the signal output end of the controller is respectively in signal connection with the signal input ends of the first control valve and the second control valve. Compared with the prior art, the ammonia water cooling device has the advantages that the structure is simple, the implementation is easy, natural wind resources are fully utilized to cool mixed gas of ammonia gas and water vapor to form ammonia water, the efficiency of ammonia gas absorption to form ammonia water is improved, the cooling energy consumption is saved, and the production continuity and the applicability of the device are ensured.

Description

Technical field:

[0001] The utility model relates to the technical field of aminoglycerol production, in particular to automatic condensing equipment for recycling ammonia water in the process of producing aminoglycerol. Background technology:

[0002] Aminoglycerol is not only produced The invention is an irreplaceable raw material for non-ionic contrast agents ioversol, iohexol and iopamidol, and can also be used as pesticide intermediates, emulsifiers and organic synthesis intermediates, and has a wide range of uses; wherein the patent No. CN200910018613.7 discloses a synthesis process of aminoglycerol, wherein an inorganic acid and toluenesulfonic acid are added as catalysts to an epichlorohydrin hydrolysis system, and chloroglycerol is obtained by hydrolysis, and then aminoglycerol is obtained by amination, deamination, dehydration, desalination and finished product distillation steps; wherein the aminated liquid after deamination, dehydration and desalination is first subjected to atmospheric distillation in a distillation kettle, and then When the gas phase temperature reaches 101-103°C, reduced pressure distillation is carried out, and heating is stopped when the kettle temperature reaches 115-120°C; the removed mixed gas of ammonia and water vapor is currently directly sent to the absorption tower for spray absorption to form ammonia water, and the formed ammonia water is reused as a raw material in the amination step; the above recovery process has the following problems: 1. The mixed gas of ammonia and water vapor directly enters the absorption tower, which will cause air hammer phenomenon in the absorption tower; 2. When ammonia enters the absorption tower, the sprayed water absorbs the ammonia and releases a large amount of heat, which will cause the temperature in the absorption tower to be too high, resulting in a decrease in the absorption efficiency of the absorption tower. Utility model content:

[0003] The utility model aims to provide an automatic condensing device for recovering ammonia water in the process of producing aminoglycerol, which has a simple structure, improves the efficiency of forming ammonia water and saves cooling energy consumption.

[0004] The utility model is implemented by the following technical scheme: The purpose of this patent is to provide an automatic condensing device for recovering ammonia water in the process of producing aminoglycerol, which includes a distillation kettle, a primary air cooler, a secondary air cooler and an absorption tower; the gas outlet of the distillation kettle is respectively connected with the air inlets of the primary air cooler and the secondary air cooler, the gas outlet of the primary air cooler is connected with the air inlet of the secondary air cooler, and the liquid outlets of the primary air cooler and the secondary air cooler are connected with the lower liquid inlet of the absorption tower; the gas outlet of the secondary air cooler is connected with the middle air inlet of the absorption tower; the primary air cooler and the secondary air cooler are both placed on the top of the factory building, and a first temperature sensor is arranged on the pipeline of the gas outlet of the distillation kettle; a first control valve is arranged on the pipeline of the air inlet of the primary air cooler, and a second control valve is arranged on the pipeline of the air inlet of the secondary air cooler; the signal output end of the first temperature sensor is connected with the signal input end of the controller through a signal, and the signal output end of the controller is respectively connected with the signal input end of the first control valve and the second control valve through a signal.

[0005] Furthermore, a second temperature sensor is provided on the pipe at the air outlet of the first-stage air cooler, and a third temperature sensor is provided on the pipe at the air outlet of the second-stage air cooler; the signal output ends of the second temperature sensor and the third temperature sensor are both connected to the signal input end of the controller through signals; the signal output end of the controller is respectively connected to the signal input ends of the blower of the first-stage air cooler and the blower of the second-stage air cooler through signals.

[0006] Furthermore, the structures of the primary air cooler and the secondary air cooler are the same; the primary air cooler includes a frame, a square sealed tube, a fin tube and the blower; the square sealed tubes are horizontally fixed at the upper and lower parts of the frame, respectively, and a plurality of the fin tubes are fixedly connected between two square sealed tubes to form a fin tube group; a plurality of the blowers are fixed on the frame on one side of the fin tube group, and the air outlet of the blower faces the fin tube group.

[0007] Furthermore, mesh sheets are respectively fixed on the frames on both sides of the fin tube group.

[0008] Furthermore, an air inlet is provided at one end of the square sealed tube above the frame, an air outlet is provided at one end of the square sealed tube below the frame, and a liquid outlet is provided at the bottom of the square sealed tube below the frame.

[0009] Furthermore, it also includes a circulation pump and an ammonia water tank, the liquid outlet of the absorption tower is connected to the liquid inlet of the circulation pump and the ammonia water tank respectively, and the liquid outlet of the circulation pump is connected to the liquid inlet of the spray pipe of the absorption tower.

[0010] Advantages of the utility model: 1. The utility model has a simple structure and is easy to implement. By arranging a first-stage air cooler and a second-stage air cooler on the top of the factory building, for windy areas, natural wind resources are fully utilized to cool the mixed gas of ammonia and water vapor to form ammonia water, and then sent to the bottom of the absorption tower. The non-condensable gas discharged by the second-stage air cooler enters the middle of the absorption tower and absorbs the ammonia therein through spraying, which avoids the air hammer phenomenon caused by the mixed gas directly entering the absorption tower, and avoids the problem of excessive temperature in the absorption tower, improves the efficiency of ammonia absorption to form ammonia water, and saves cooling energy. 2. The utility model realizes the automatic interlocking of the second temperature sensor and the blower of the first-stage air cooler, and the automatic interlocking of the third temperature sensor and the blower of the second-stage air cooler, which overcomes the problem of reduced air cooling effect in windless conditions and ensures the continuity of production and the applicability of the device. Description of the drawings:

[0011] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0012] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0013] Figure 2 It is a control schematic diagram of the utility model.

[0014] Figure 3 This is a schematic diagram of the structure of the first-stage air cooler.

[0015] Distillation kettle 1, primary air cooler 2, secondary air cooler 3, absorption tower 4, circulation pump 5, ammonia water tank 6, first temperature sensor 7, first control valve 8, second control valve 9, controller 10, second temperature sensor 11, third temperature sensor 12, frame 13, square sealing tube 14, fin tube 15, blower 16, fin tube group 17, mesh 18. Specific implementation method:

[0016] Example: Figure 1-3As shown, an automatic condensing device for recovering ammonia water in the process of producing aminoglycerol comprises a distillation kettle 1, a primary air cooler 2, a secondary air cooler 3, an absorption tower 4, a circulation pump 5 and an ammonia water tank 6; the gas outlet of the distillation kettle 1 is communicated with the gas inlets of the primary air cooler 2 and the secondary air cooler 3 respectively, the gas outlet of the primary air cooler 2 is communicated with the gas inlet of the secondary air cooler 3, the liquid outlets of the primary air cooler 2 and the secondary air cooler 3 are communicated with the lower liquid inlet of the absorption tower 4; the gas outlet of the secondary air cooler 3 is communicated with the middle gas inlet of the absorption tower 4; the liquid outlet of the absorption tower 4 is communicated with the liquid inlets of the circulation pump 5 and the ammonia water tank 6 respectively, and the liquid outlet of the circulation pump 5 is communicated with the liquid inlet of the spray pipe of the absorption tower 4. The primary air cooler 2 and the secondary air cooler 3 are both placed on the top of the factory building. For windy areas, natural wind resources are fully utilized to cool the mixed gas of ammonia and water vapor to form ammonia water, saving cooling energy consumption; a first temperature sensor 7 is arranged on the pipe at the air outlet of the distillation kettle 1; a first control valve 8 is arranged on the pipe at the air inlet of the primary air cooler 2, and a second control valve 9 is arranged on the pipe at the air inlet of the secondary air cooler 3; the signal output end of the first temperature sensor 7 is connected to the signal input end of the controller 10 through a signal, and the signal output end of the controller 10 is respectively connected to the signal input ends of the first control valve 8 and the second control valve 9 through a signal.

[0017] A second temperature sensor 11 is arranged on the pipe of the air outlet of the first-stage air cooler 2, and a third temperature sensor 12 is arranged on the pipe of the air outlet of the second-stage air cooler 3; the signal output ends of the second temperature sensor 11 and the third temperature sensor 12 are both connected to the signal input end of the controller 10 through signals; the signal output end of the controller 10 is respectively connected to the signal input end of the blower 16 of the first-stage air cooler 2 and the blower 16 of the second-stage air cooler 3 through signals.

[0018] The primary air cooler 2 and the secondary air cooler 3 have the same structure; the primary air cooler 2 includes a frame 13, a square sealed tube 14, a fin tube 15 and a blower 16; square sealed tubes 14 are horizontally fixed on the upper and lower sides of the frame 13, respectively, so that the fin tubes 15 are arranged horizontally, and a plurality of fin tubes 15 are fixedly connected between two square sealed tubes 14 to form a fin tube group 17; a plurality of blowers 16 are fixed on the frame 13 on one side of the fin tube group 17, and the air outlet of the blower 16 faces the fin tube group 17; mesh sheets 18 are fixed on the frame 13 on both sides of the fin tube group 17, respectively, to play a role in dust prevention; a square sealed tube 14 is provided at one end of the frame 13 An air inlet is provided at one end of the square sealed tube 14 below the frame 13, and a liquid outlet is provided at the bottom of the square sealed tube 14 below the frame 13; both the first-stage air cooler 2 and the second-stage air cooler 3 have air intake from the top, air outlet from the bottom, and liquid discharge from the bottom, which effectively avoids the lower intake air and the condensate from meeting in the fin tube 15. The meeting position is prone to absorb ammonia and release heat, which in turn causes the fin tube 15 to generate phase change stress at the meeting position, which easily causes the fin tube 15 to rupture. Therefore, the upper intake and lower exhaust are adopted, and the mixed gas gradually forms condensate during the descending process, and is finally discharged from the bottom of the square sealed tube 14 below, avoiding the generation of phase change stress and increasing the service life of the fin tube 15.

[0019] Working principle: The first temperature sensor 7 detects the temperature of the mixed gas of ammonia and water vapor discharged from the distillation kettle 1 and transmits it to the controller 10. When the temperature is lower than 90°C, the controller 10 controls the second control valve 9 to open and the first control valve 8 to close, and the mixed gas of ammonia and water vapor enters the secondary air cooler 3 for cooling. When the temperature is higher than 90°C, the controller 10 controls the second control valve 9 to close and the first control valve 8 to open, and the mixed gas of ammonia and water vapor enters the primary air cooler 2 for cooling. The non-condensable gas after cooling enters the secondary air cooler 3 for cooling. The primary air cooler 2 and the secondary air cooler The ammonia water formed by cooling in the air cooler 3 is sent to the bottom of the absorption tower 4, and the non-condensable gas discharged from the secondary air cooler 3 enters the middle of the absorption tower 4 and absorbs the ammonia therein by spraying, thereby avoiding the air hammer phenomenon caused by the mixed gas directly entering the absorption tower 4, and avoiding the problem of over-high temperature in the absorption tower 4, thereby improving the efficiency of ammonia absorption to form ammonia water; the ammonia water in the absorption tower 4 is pumped into the spray pipe of the absorption tower 4 through a circulation pump, and the ammonia water is sprayed out to absorb the ammonia in the non-condensable gas. When the ammonia water reaches a certain concentration, it is sent to the ammonia water tank 6 to temporarily store the raw materials for the amination reaction process of producing aminoglycerol.

[0020] The second temperature sensor 11 constantly detects the temperature of the non-condensable gas discharged from the primary air cooler 2 and transmits it to the controller 10. When the temperature is higher than 90°C, the controller 10 controls the blower 16 of the primary air cooler 2 to start; the third temperature sensor 12 constantly detects the temperature of the non-condensable gas discharged from the secondary air cooler 3 and transmits it to the controller 10. When the temperature is higher than 60°C, the controller 10 controls the blower 16 of the secondary air cooler 3 to start; the second temperature sensor 11 and the blower 16 of the primary air cooler 2 are automatically interlocked, and the third temperature sensor 12 and the blower 16 of the secondary air cooler 3 are automatically interlocked, which overcomes the problem of reduced air cooling effect in the absence of wind and ensures the continuity of production and the applicability of the device.

[0021] 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, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An automatic condensing device for recovering aqueous ammonia in the process of producing aminoglycerol, characterized in that: It includes a distillation kettle, a primary air cooler, a secondary air cooler and an absorption tower; the air outlet of the distillation kettle is communicated with the air inlets of the primary air cooler and the secondary air cooler respectively, the air outlet of the primary air cooler is communicated with the air inlet of the secondary air cooler, the liquid outlets of the primary air cooler and the secondary air cooler are communicated with the lower liquid inlet of the absorption tower; the air outlet of the secondary air cooler is communicated with the middle air inlet of the absorption tower; the primary air cooler and the secondary air cooler are both placed on the top of the factory building, and a first temperature sensor is arranged on the pipeline of the air outlet of the distillation kettle; a first control valve is arranged on the pipeline of the air inlet of the primary air cooler, and a second control valve is arranged on the pipeline of the air inlet of the secondary air cooler; the signal output end of the first temperature sensor is connected with the signal input end of the controller through a signal, and the signal output end of the controller is respectively connected with the signal input end of the first control valve and the second control valve through a signal.

2. The automatic condensing device for recovering aqueous ammonia in the process of producing aminoglycerol according to claim 1, characterized in that: A second temperature sensor is arranged on the pipe of the air outlet of the first-stage air cooler, and a third temperature sensor is arranged on the pipe of the air outlet of the second-stage air cooler; the signal output ends of the second temperature sensor and the third temperature sensor are both connected to the signal input end of the controller through signals; the signal output end of the controller is respectively connected to the signal input ends of the blower of the first-stage air cooler and the blower of the second-stage air cooler through signals.

3. The automatic condensing device for recovering aqueous ammonia in the process of producing aminoglycerol according to claim 2, characterized in that: The structures of the primary air cooler and the secondary air cooler are the same; the primary air cooler includes a frame, a square sealed tube, a fin tube and the blower; the square sealed tubes are horizontally fixed at the upper and lower parts of the frame, respectively, and a plurality of the fin tubes are fixedly connected between two square sealed tubes to form a fin tube group; a plurality of the blowers are fixed on the frame on one side of the fin tube group, and the air outlet of the blower faces the fin tube group.

4. The automatic condensing device for recovering aqueous ammonia in the process of producing aminoglycerol according to claim 3, characterized in that: Meshes are respectively fixed on the frames on both sides of the fin tube group.

5. The automatic condensing device for recovering aqueous ammonia in the process of producing aminoglycerol according to claim 4, characterized in that: An air inlet is provided at one end of the square sealed tube above the frame, an air outlet is provided at one end of the square sealed tube below the frame, and a liquid outlet is provided at the bottom of the square sealed tube below the frame.

6. The automatic condensing device for recovering aqueous ammonia in the process of producing aminoglycerol according to claim 1, characterized in that: It also includes a circulation pump and an ammonia water tank. The liquid outlet of the absorption tower is respectively connected to the liquid inlet of the circulation pump and the ammonia water tank, and the liquid outlet of the circulation pump is connected to the liquid inlet of the spray pipe of the absorption tower.

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