A continuous mixing batch system for methylamine synthesis

Abstract

The application discloses a continuous mixing and batching system for methylamine synthesis, belongs to the technical field of methylamine synthesis, and comprises a methanol storage tank, an ammonia storage tank, a zeotrope storage tank, a mixed-ammonia storage tank and a mixing kettle, wherein the methanol storage tank, the ammonia storage tank, the zeotrope storage tank and the mixed-ammonia storage tank are connected with the mixing kettle through pipelines, and a low-temperature heat exchanger, a start-up vaporizer, a three-stage high-temperature heat exchanger, a reactor, a rectifying tower and a tail gas absorption tower are arranged at the rear section of the mixing kettle. In the application, component materials are firstly introduced into a feed pre-mixer through a feed pipeline, and the materials are atomized by an atomizing nozzle arranged at one end of the feed pre-mixer and then mixed with each other, so that the high-efficiency pre-mixing effect is achieved. The first stirring mixer arranged outside the stirring shaft and in the feed pre-mixer has an arc-shaped plate structure and a first mixing mesh hole, and when the first stirring mixer rotates along with the stirring shaft, the stirring resistance can be reduced, and the material mixing uniformity can be further improved through collision and mesh dispersion.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of methylamine synthesis, and particularly relates to a continuous mixing and batching system for methylamine synthesis. BACKGROUND

[0002] In the field of methylamine synthesis, the traditional continuous mixing and batching system has many problems to be solved in practical application. On the one hand, during the mixing of raw materials, due to the limitation of the design of the mixing device, the components of the material are difficult to achieve efficient and uniform mixing, which directly affects the stability of the subsequent reaction and the quality of the product. For example, in some systems, after the material enters the mixing equipment, it is only mixed by a simple stirring structure, resulting in uneven mixing of the material and a large local concentration difference.

[0003] On the other hand, in the tail gas treatment link, the traditional spraying absorption method has insufficient spraying force and limited spraying range, so that the tail gas and the absorption liquid cannot be fully contacted, the absorption efficiency is low, and it is difficult to meet the environmental protection requirements. In addition, the existing system also has problems such as poor dispersion effect and low conveying efficiency in the process of material dispersion and conveying, which restricts the improvement of the efficiency and quality of methylamine synthesis production. SUMMARY

[0004] In order to solve the problems mentioned in the background, the present application provides a continuous mixing and batching system for methylamine synthesis.

[0005] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0006] A continuous mixing and batching system for methylamine synthesis, comprising a methanol storage tank, a liquid ammonia storage tank, a azeotrope storage tank, a mixed amine storage tank and a mixing kettle, the methanol storage tank, the liquid ammonia storage tank, the azeotrope storage tank and the mixed amine storage tank are connected with the mixing kettle through pipelines, and a low-temperature heat exchanger, a start-up vaporizer, a three-stage high-temperature heat exchanger, a reactor, a rectifying column and a tail gas absorption tower are arranged at the rear section of the mixing kettle;

[0007] A plurality of feeding pipelines are arranged at the top end of the mixing kettle, a discharging port is arranged at the bottom end of the mixing kettle, and a stirring mechanism is arranged in the mixing kettle;

[0008] The stirring mechanism comprises a stirring shaft, the top end of the stirring shaft extends to the outside of the mixing kettle, and the stirring shaft is driven to rotate by a motor;

[0009] A feeding premixer is arranged in the mixing kettle;

[0010] The tail gas absorption tower comprises a circulating pump and a sprayer, the circulating pump delivers the absorption liquid in the tower kettle of the tail gas absorption tower to the sprayer at the top of the tail gas absorption tower;

[0011] The sprayer comprises a cylindrical liquid reservoir, the inside of the cylindrical liquid reservoir is divided into multiple sector areas by a partition plate, each sector area is provided with a sector piston plate, a liquid injection groove is arranged at the center position of the cylindrical liquid reservoir, the liquid injection groove is communicated with each sector area through a rectangular opening, an installation frame is arranged above the sprayer, a plurality of elastic telescopic rods are arranged at the bottom end of the installation frame, the movable ends of the elastic telescopic rods are movably extended to the sprayer and correspond to each sector piston plate one by one, and a plurality of spray heads are arranged at the bottom end of the sprayer.

[0012] Preferably, the bottom end of the feeding premixer is provided with a polymerization hopper, and the lower side of the polymerization hopper is provided with a discharge pipe.

[0013] The stirring shaft penetrates through the feeding premixer, the polymerization hopper and the discharge pipe, and the plurality of feeding pipelines are communicated with the feeding premixer.

[0014] Preferably, a first stirring mixer is fixed at the outside of the stirring shaft at the inside position of the feeding premixer, the first stirring mixer is in an arc plate structure, and a first mixing mesh is arranged on the first stirring mixer.

[0015] Preferably, a discharge screw is arranged at the inside of the discharge pipe at the outside of the stirring shaft, a toothed disc is fixed and mounted at the outside of the stirring shaft, and the top end of the toothed disc movably contacts the bottom end of the discharge pipe.

[0016] Preferably, a sealing cover is fixed at the outside of the discharge pipe, a plurality of liquid outlet pipes are rotatably mounted at the inside of the sealing cover at the outside of the discharge pipe, a first gear is fixed at the outside of the liquid outlet pipe, and the plurality of first gears are meshed with the toothed disc.

[0017] Preferably, one end of the liquid outlet pipe extends to the outside of the sealing cover and is fixed with a vertical distribution pipe, and a plurality of horizontal distribution pipes are fixed at the side away from the liquid outlet pipe of the vertical distribution pipe.

[0018] Preferably, a second stirring mixer is fixed at the bottom end of the stirring shaft, the second stirring mixer is a stirring blade, and a ring-shaped stopper is fixed at the top end of the stirring blade, and a second mixing mesh is arranged on the ring-shaped stopper.

[0019] Preferably, a liquid inlet pipe is connected to the top end of the cylindrical liquid reservoir, the liquid inlet pipe is communicated with the liquid injection groove, a sealing plate is rotatably mounted at the lower side of the cylindrical liquid reservoir through a rotating shaft, and a plurality of sector through holes are arranged at the sealing plate in an interval.

[0020] Preferably, the top end of the rotating shaft extends to the inside of the liquid injection groove and is connected with a plurality of sealing strips, the plurality of sealing strips are arranged in an interval, and the plurality of sealing strips correspond to the upper sides of the plurality of sector through holes, respectively.

[0021] Preferably, the top end of the sealing plate is fixed with a driving ring, the outside of the driving ring is continuously provided with a section of engaging teeth, one side of the driving ring is provided with a rotating column through a support, and the bottom end of the rotating column is fixed with a second gear.

[0022] Preferably, the support is further fixed with a pneumatic cylinder, the output shaft of the pneumatic cylinder is fixed with a driving rod, the outside of the rotating column is provided with a screw guide groove, and one end of the driving rod extends into the screw guide groove.

[0023] Compared with the prior art, the present application has the following beneficial effects:

[0024] 1、In the present application, the materials of each component are first introduced into the feeding pipeline and then into the feeding premixer. The material is atomized by the atomizing nozzle at one end of the feeding premixer and then mixed by mutual impact, thereby achieving high-efficiency premixing. The first stirring mixer on the outside of the stirring shaft inside the feeding premixer has an arc-shaped plate structure and a first mixing mesh hole. When the first stirring mixer rotates with the stirring shaft, it can not only reduce the stirring resistance but also further improve the uniformity of the material mixing through impact and mesh dispersion. The material is downwardly conveyed by the discharge screw inside the discharge pipe while the stirring shaft drives the gear disc to rotate, thereby driving the discharge pipe to rotate, continuously rotating the vertically distributed pipe and the horizontally distributed pipe, high-speed spraying and dispersing the material, and assisting stirring to improve the mixing efficiency. The second stirring mixer at the bottom end of the stirring shaft and the annular barrier at the top end of the stirring shaft further stir and disperse the material, and the second mixing mesh hole on the annular barrier can further improve the material dispersion effect, thereby ensuring that the material is fully mixed in the mixing kettle.

[0025] 2、In the present application, the spray device in the tail gas absorption tower is designed. The rotation of the sealing plate is matched with the fan-shaped area, the fan-shaped piston plate, the elastic expansion rod and other structures in the cylindrical liquid reservoir, so as to realize the alternate spraying of the absorption liquid. The circulation pump delivers the absorption liquid to the liquid injection groove, and then to each fan-shaped area. The rotation of the sealing plate can alternately block half of the spray heads, so that half of the fan-shaped areas accumulate absorption liquid. The elastic expansion rod is compressed, and when the sealing plate rotates, the elastic expansion rod pushes the absorption liquid to be sprayed at high speed. The other half of the fan-shaped areas begin to accumulate absorption liquid. In this way, the spraying intensity and range of the absorption liquid are improved, the tail gas and the absorption liquid are fully contacted, the absorption effect is significantly improved, and the environmental protection requirements are met. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0027] Figure 1 It is a perspective view of the mixing kettle of the present application.

[0028] Figure 2 This is a top view of the mixing vessel of the present invention;

[0029] Figure 3 This is a front-view sectional view of the mixing tank of the present invention;

[0030] Figure 4 This is a schematic diagram of the internal structure of the mixing tank of the present invention;

[0031] Figure 5 This is a front-view sectional view of the feed premixer of the present invention;

[0032] Figure 6 for Figure 5 Enlarged detail image of position A in the middle;

[0033] Figure 7 This is a schematic diagram of the internal structure of the feed premixer;

[0034] Figure 8 This is a flowchart of the present invention;

[0035] Figure 9 This is a front view of the exhaust gas absorption tower of the present invention;

[0036] Figure 10 This is a first-view perspective perspective view of the sprayer in the exhaust gas absorption tower of the present invention;

[0037] Figure 11 This is a second perspective view of the sprayer of the present invention;

[0038] Figure 12 This is a bottom view of the cylindrical liquid reservoir of the present invention;

[0039] Figure 13 This is a perspective view of the cylindrical liquid reservoir of the present invention;

[0040] Figure 14 This is a schematic diagram of the distribution of the fan-shaped regions inside the cylindrical liquid reservoir of the present invention.

[0041] Figure 15 This is a schematic diagram showing the connection relationship between the rotating shaft and the sealing strip of the present invention;

[0042] In the figure: 1. Mixing kettle; 101. Feeding pipeline; 102. Discharge port; 2. Stirring shaft; 201. Motor; 202. Second stirring mixer; 203. Ring-shaped barrier; 204. First stirring mixer; 205. Discharge screw; 206. Toothed disc; 3. Feeding premixer; 301. Polymerization hopper; 302. Discharge pipe; 4. Sealing cover; 401. Liquid outlet pipe; 402. Vertical distribution pipe; 403. Horizontal distribution pipe; 5. Methanol storage tank; 501. Liquid ammonia storage tank; 502. Azeotrope storage tank; 503. Low-temperature heat exchanger; 504. Start-up vaporizer; 505. Three-stage high-temperature heat exchanger; 506. Reactor; 507. Rectifying column; 508. Mixed amine storage tank; 6. Tail gas absorption tower; 7. Circulating pump; 8. Sprayer; 801. Cylindrical liquid reservoir; 802. Spraying head; 803. Fan-shaped area; 804. Fan-shaped piston plate; 805. Liquid injection groove; 806. Rectangular opening; 807. Movable end; 808. Elastic telescopic rod; 809. Mounting frame; 810. Liquid inlet pipe; 811. Blocking plate; 812. Fan-shaped through hole; 813. Driving ring; 814. Rotating column; 815. Second gear; 816. Spiral guide groove; 817. Air cylinder; 818. Driving rod; 819. Rotation shaft; 820. Blocking strip. DETAILED DESCRIPTION

[0043] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0044] Embodiment 1

[0045] Reference Figures 1-15The application relates to a continuous mixing and dosing system for synthesizing methylamine, which comprises a methanol storage tank 5, a liquid ammonia storage tank 501, a azeotrope storage tank 502, a mixed-ammonia storage tank 508 and a mixing kettle 1, wherein the methanol storage tank 5, the liquid ammonia storage tank 501, the azeotrope storage tank 502 and the mixed-ammonia storage tank 508 are connected with the mixing kettle 1 through pipelines; a low-temperature heat exchanger 503, a start-up vaporizer 504, a three-stage high-temperature heat exchanger 505, a reactor 506, a rectifying tower 507 and a tail gas absorption tower 6 are arranged at the rear section of the mixing kettle 1; four feeding pipelines 101 are arranged; methanol, liquid ammonia, azeotrope and mixed ammonia are respectively filtered from the respective storage tanks and then enter the mixing kettle 1 through the four feeding pipelines 101 to be mixed; after the mixing is completed, the mixed raw material liquid is discharged through a discharge port 102; the mixed raw material liquid is 40 DEG C and enters the low-temperature heat exchanger 503; after heat exchange with synthesis gas, the temperature of the mixed raw material liquid is increased to about 125 DEG C; then the mixed raw material liquid enters the start-up vaporizer 504 to exchange heat with the tower kettle liquid of the reactor 506, so that the temperature is increased by about 140 DEG C; at this time, the mixed raw material liquid is completely vaporized; then the mixed raw material liquid enters the three-stage high-temperature heat exchanger 505 in series to be heated; the mixed raw material liquid exchanges heat with the reaction gas from the reactor 506, so that the temperature is increased to about 320 DEG C; then the mixed raw material liquid enters an electric heating furnace to be heated to 380 DEG C-385 DEG C; then the mixed raw material liquid enters the reactor 506 to react; the product is rectified in the rectifying tower 507; and the tail gas generated by the rectifying tower 507 is treated by the tail gas absorption tower 6.

[0046] A plurality of feeding pipelines 101 are arranged at the top end of the mixing kettle 1; a discharge port 102 is arranged at the bottom end of the mixing kettle 1; a stirring mechanism is arranged in the mixing kettle 1; the stirring shaft 2 is driven to rotate by the motor 201; the component materials are stirred to ensure that the component materials are fully mixed and then discharged from the discharge port 102, so that the stability of the subsequent reaction is maintained.

[0047] The stirring mechanism comprises the stirring shaft 2; the top end of the stirring shaft 2 extends to the outside of the mixing kettle 1 and is driven to rotate by the motor 201.

[0048] A feeding premixer 3 is arranged in the mixing kettle 1; a polymerization hopper 301 is arranged at the bottom end of the feeding premixer 3; a discharge pipe 302 is arranged below the polymerization hopper 301; the stirring shaft 2 penetrates through the feeding premixer 3, the polymerization hopper 301 and the discharge pipe 302; the plurality of feeding pipelines 101 are in communication with the feeding premixer 3; the component materials are first concentrated into the feeding premixer 3 through the feeding pipelines 101; each feeding pipeline 101 is provided with an atomizing nozzle at one end of the feeding premixer 3; the liquid spraying directions of the atomizing nozzles correspond to each other; the component materials are mixed by mutual impact after being atomized, so that the purpose of high-efficiency premixing is achieved; the mixed materials are gathered through the polymerization hopper 301 and then discharged through the discharge pipe 302; and the component materials are stirred and mixed again in the mixing kettle 1.

[0049] The tail gas absorption tower 6 comprises a circulating pump 7 and a sprayer 8, the circulating pump 7 transports the absorption liquid in the tower kettle of the tail gas absorption tower 6 to the sprayer 8 at the top of the tail gas absorption tower 6, and the absorption liquid in the tower kettle of the tail gas absorption tower 6 is pumped to the sprayer 8 by the circulating pump 7 to realize the circulation spraying;

[0050] Embodiment 2

[0051] With reference to Figures 1-15 The difference between the embodiment and embodiment 1 is that a first stirring mixer 204 is fixed at the outer side of the stirring shaft 2 and located inside the feeding premixer 3, the first stirring mixer 204 is in an arc plate structure, and a first mixing mesh hole is formed in the first stirring mixer 204.

[0052] The material sprayed by the atomizing nozzle on the feeding pipeline 101 first collides with the surface of the first stirring mixer 204, and the first stirring mixer 204 rotates with the stirring shaft 2 to realize the dispersion of the material, thereby further improving the uniformity of the mixture of the components, the arc structure of the first stirring mixer 204 can reduce the resistance generated in the stirring process, thereby achieving the effect of energy saving, and the material passes through the first stirring mixer 204 through the first mixing mesh hole, thereby further improving the dispersion effect of the material.

[0053] The outer side of the stirring shaft 2 is provided with a discharging screw 205 inside the discharge pipe 302, the outer side of the stirring shaft 2 is fixedly provided with a toothed disc 206, the top end of the toothed disc 206 is in movable contact with the bottom end of the discharge pipe 302, the outer side of the discharge pipe 302 is fixedly provided with a sealing cover 4, the outer side of the discharge pipe 302 is rotatably provided with a plurality of liquid outlet pipes 401 inside the sealing cover 4, the outer side of the liquid outlet pipe 401 is fixedly provided with a first gear, the plurality of first gears are in meshing connection with the toothed disc 206, one end of the liquid outlet pipe 401 extends to the outside of the sealing cover 4 and is fixedly provided with a vertical distribution pipe 402, and the side of the vertical distribution pipe 402 away from the liquid outlet pipe 401 is fixedly provided with a plurality of horizontal distribution pipes 403.

[0054] The presence of the discharging screw 205 can pressurize and convey the material gathered in the polymerization hopper 301 downward by gravity, and then the material is sprayed out at high speed through the liquid outlet pipe 401, since the stirring shaft 2 drives the toothed disc 206 to rotate, and the toothed disc 206 is in meshing connection with the first gear on the liquid outlet pipe 401, the liquid outlet pipe 401 can be driven to rotate, thereby driving the vertical distribution pipe 402 and the horizontal distribution pipe 403 to rotate continuously, which can improve the dispersion effect of the material, and the movement of the horizontal distribution pipe 403 can also assist in stirring the material, thereby improving the mixing efficiency of the material.

[0055] The bottom end of the stirring shaft 2 is fixedly provided with a second stirring mixer 202, the second stirring mixer 202 is a stirring blade, and the top end of the stirring blade is fixedly provided with an annular blocker 203, and a second mixing mesh hole is formed in the annular blocker 203.

[0056] The material sprayed by the horizontal distribution pipe 403 directly impacts the annular barrier 203, and the material passes through the second mixing mesh and penetrates the annular barrier 203, further improving the material dispersion effect.

[0057] Embodiment 3

[0058] With reference to Figures 1-15 The difference between this embodiment and embodiment 1 is that the sprayer 8 comprises a cylindrical liquid reservoir 801, the inside of the cylindrical liquid reservoir 801 is divided into multiple sector-shaped areas 803 by a partition, each sector-shaped area 803 is provided with a sector-shaped piston plate 804, a liquid injection groove 805 is arranged at the center position of the cylindrical liquid reservoir 801, the liquid injection groove 805 and each sector-shaped area 803 are in communication through a rectangular opening 806, an installation frame 809 is arranged above the sprayer 8, the bottom end of the installation frame 809 is provided with multiple elastic telescopic rods 808, the movable end 807 of the elastic telescopic rod 808 extends to the sprayer 8 and corresponds to each sector-shaped piston plate 804 one by one, multiple spray heads 802 are arranged at the bottom end of the sprayer 8, a liquid inlet pipe 810 is connected to the top end of the cylindrical liquid reservoir 801, the liquid inlet pipe 810 is in communication with the liquid injection groove 805, a blocking plate 811 is rotatably installed below the cylindrical liquid reservoir 801 through a rotating shaft 819, multiple sector-shaped through holes 812 are arranged at intervals on the blocking plate 811, the top end of the rotating shaft 819 extends into the inside of the liquid injection groove 805 and is connected with multiple blocking strips 820, the multiple blocking strips 820 are arranged at intervals, and the multiple blocking strips 820 correspond to above the multiple sector-shaped through holes 812 respectively;

[0059] The tail gas flows from bottom to top, and the absorption liquid is sprayed from the spray head 802, multiple filler layers are arranged in the tail gas absorption tower 6, so as to promote the full contact between the tail gas and the absorption liquid.

[0060] The liquid outlet of the circulating pump 7 is connected with the liquid inlet pipe 810 through a pipe, the liquid inlet pipe 810 leads the circulating absorption liquid into the liquid injection groove 805, then the absorption liquid enters into each fan-shaped area 803 through the rectangular opening 806, the spray head 802 is provided with multiple groups, and each group of the spray head 802 corresponds to one fan-shaped area 803, the position of the fan-shaped through hole 812 can be changed by rotating the blocking plate 811, only half of the spray head 802 is aligned with the fan-shaped through hole 812 at the same time, and the rest of the spray head 802 is blocked, since the shaft 819, the blocking strip 820 and the blocking plate 811 are fixed with each other, the rotation is synchronous, the rectangular opening 806 in the fan-shaped area 803 corresponding to the blocked spray head 802 is just staggered with the blocking strip 820, and the rest of the rectangular opening 806 is blocked by the blocking strip 820, in the working process, half of the spray head 802 can be alternately blocked, so that the absorption liquid is accumulated in half of the fan-shaped area 803, in the accumulation process, the fan-shaped piston plate 804 at the corresponding position moves upward, and the elastic telescopic rod 808 connected with the fan-shaped piston plate 804 is compressed, after the blocking plate 811 rotates by an angle, the elastic telescopic rod 808 accumulates the elastic force to push the absorption liquid to be sprayed at high speed from the spray head 802, at the same time, the absorption liquid starts to be accumulated in the other half of the fan-shaped area 803, and the process is repeated, so that the absorption liquid can be continuously and alternately sprayed from the spray head 802, the absorption liquid accumulation and the absorption liquid spraying are synchronized, the spraying intensity of the absorption liquid can be improved, the spraying range can be improved, and the absorption effect can be improved.

[0061] The top end of the blocking plate 811 is fixed with a driving ring 813, a section of meshing teeth is continuously distributed on the outer side of the driving ring 813, a rotating column 814 is installed on one side of the driving ring 813 through a support, the bottom end of the rotating column 814 is fixed with a second gear 815, a gas cylinder 817 is also fixed on the support, a driving rod 818 is fixed on the output shaft of the gas cylinder 817, a helical guide groove 816 is formed on the outer side of the rotating column 814, and one end of the driving rod 818 extends into the helical guide groove 816.

[0062] The driving rod 818 can be lifted and lowered by controlling the gas cylinder 817, since the driving rod 818 is limitedly matched with the helical guide groove 816, the linear driving force of the gas cylinder 817 can be converted into the reciprocating rotation of the rotating column 814, and then the second gear 815 can be reciprocatingly rotated, so that the driving ring 813 can be reciprocatingly rotated in a meshing mode, and the blocking plate 811 can be reciprocatingly rotated, so that the two positions can be switched.

[0063] In the description of the present application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present 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, and therefore cannot be understood as a limitation on the present application.

[0064] In the present application, unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection", "connection", "fixation" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances.

[0065] The control mode of the present application is automatically controlled by the controller, and the control circuit of the controller can be realized by simple programming by those skilled in the art, the power supply also belongs to the common knowledge in the art, and the present application is mainly used to protect mechanical devices, so the control mode and circuit connection of the present application will not be explained in detail.

[0066] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A continuous mixing batch system for methylamine synthesis comprising a methanol storage tank (5), a liquid ammonia storage tank (501), a zeotrope storage tank (502), a mixed amine storage tank (508) and a mixing kettle (1), characterized in that: The methanol storage tank (5), the liquid ammonia storage tank (501), the azeotrope storage tank (502) and the mixed amine storage tank (508) are connected with the mixing kettle (1) through pipelines, and a low-temperature heat exchanger (503), a start-up vaporizer (504), a three-stage high-temperature heat exchanger (505), a reactor (506), a rectifying tower (507) and a tail gas absorption tower (6) are arranged at the rear section of the mixing kettle (1); A plurality of feeding pipelines (101) are arranged at the top end of the mixing kettle (1), a discharging port (102) is arranged at the bottom end of the mixing kettle (1), and a stirring mechanism is arranged in the mixing kettle (1); The stirring mechanism comprises a stirring shaft (2), the top end of the stirring shaft (2) extends to the outside of the mixing kettle (1), and the stirring shaft (2) is driven to rotate by a motor (201); The mixing kettle (1) is internally provided with a feeding premixer (3); The tail gas absorption tower (6) comprises a circulating pump (7) and a sprayer (8), the circulating pump (7) delivers the absorption liquid in the tower kettle of the tail gas absorption tower (6) to the sprayer (8) at the top of the tail gas absorption tower (6); The sprayer (8) comprises a cylindrical liquid reservoir (801), the inside of the cylindrical liquid reservoir (801) is divided into a plurality of sector-shaped areas (803) by a partition plate, a sector-shaped piston plate (804) is arranged in each sector-shaped area (803), a liquid injection groove (805) is arranged at the center position of the cylindrical liquid reservoir (801), the liquid injection groove (805) is in communication with each sector-shaped area (803) through a rectangular opening (806), a mounting rack (809) is arranged above the sprayer (8), a plurality of elastic telescopic rods (808) are arranged at the bottom end of the mounting rack (809), the movable ends (807) of the elastic telescopic rods (808) movably extend to the sprayer (8) and correspond to each sector-shaped piston plate (804) one by one, and a plurality of spraying heads (802) are arranged at the bottom end of the sprayer (8); The top end of the cylindrical liquid reservoir (801) is connected with a liquid inlet pipe (810), the liquid inlet pipe (810) is in communication with the liquid injection groove (805), a blocking plate (811) is rotatably arranged below the cylindrical liquid reservoir (801) through a rotating shaft (819), and a plurality of sector-shaped through holes (812) are arranged at the blocking plate (811) in intervals; The top end of the blocking plate (811) is fixedly connected with a driving ring (813), a section of meshing teeth is continuously arranged on the outer side of the driving ring (813), a rotating column (814) is arranged on one side of the driving ring (813) through a support, and a second gear (815) is fixedly arranged at the bottom end of the rotating column (814). The bottom end of the feeding premixer (3) is provided with a polymerization hopper (301), and a discharge pipe (302) is arranged below the polymerization hopper (301).

2. A continuous mixing batch system for methylamine synthesis as claimed in claim 1, wherein: ​ The stirring shaft (2) penetrates the feeding premixer (3), the polymerization hopper (301) and the discharge pipe (302), and a plurality of feeding pipes (101) are in communication with the feeding premixer (3).

3. A continuous mixing batch system for methylamine synthesis as claimed in claim 1, wherein: A first stirring mixer (204) is fixed at the inner side of the feeding premixer (3) of the stirring shaft (2), the first stirring mixer (204) is in an arc plate structure, and a first mixing mesh hole is formed in the first stirring mixer (204).

4. A continuous mixing batch system for methylamine synthesis as claimed in claim 1, wherein: A discharge screw (205) is arranged at the inner side of the discharge pipe (302) of the stirring shaft (2), a gear disc (206) is fixedly arranged at the outer side of the stirring shaft (2), and the top end of the gear disc (206) is in movable contact with the bottom end of the discharge pipe (302).

5. A continuous mixing batch system for methylamine synthesis as claimed in claim 4, wherein: A sealing cover (4) is fixed at the outer side of the discharge pipe (302), a plurality of liquid outlet pipes (401) are rotatably arranged at the inner side of the sealing cover (4) of the discharge pipe (302), a first gear is fixed at the outer side of the liquid outlet pipe (401), and the first gear is in meshing connection with the gear disc (206).

6. A continuous mixing batch system for methylamine synthesis as claimed in claim 5 wherein: One end of the liquid outlet pipe (401) extends to the outer side of the sealing cover (4) and is fixed with a vertical distribution pipe (402), and a plurality of horizontal distribution pipes (403) are fixed at the side of the vertical distribution pipe (402) away from the liquid outlet pipe (401).

7. A continuous mixing batch system for methylamine synthesis as claimed in claim 6 wherein: A second stirring mixer (202) is fixed at the bottom end of the stirring shaft (2), the second stirring mixer (202) is a stirring blade, and a ring-shaped stopper (203) is fixed at the top end of the stirring blade, and a second mixing mesh hole is formed in the ring-shaped stopper (203).

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