An apparatus for producing super fine adipic acid

Abstract

The present application relates to the field of super fine adipic acid production, and particularly relates to a super fine adipic acid production device, which comprises a mixing mechanism for processing raw materials, a heating mechanism for heat preservation, and a control mechanism for control, the heating mechanism is arranged outside the mixing mechanism, the bottom of the heating mechanism is fixed on a machine base, the front end of the machine base is provided with the control mechanism, the top of the mixing mechanism is provided with a power mechanism for power supply, and the device further comprises a stirring and cooling mechanism for mixing the raw materials and a stirring mechanism for providing state adjustment for the stirring and cooling mechanism, the stirring and cooling mechanism is installed inside the mixing mechanism and on the main shaft of the power mechanism, the stirring mechanism is installed at the position of a cooling pipe of the stirring and cooling mechanism, and a state matching mechanism is installed at the bottom of the mixing mechanism, so as to solve the technical problem that crystals are precipitated and attached on the cooling pipe during the stirring production of the super fine adipic acid, so that the production temperature cannot be adjusted in time, and part of the raw materials are deteriorated.

Description

Technical Field

[0001] This invention relates to the field of ultrapure adipic acid production, and specifically to an ultrapure adipic acid production apparatus. Background Technology

[0002] The ultra-refined adipic acid mixing production unit is a combination of equipment used to precisely mix adipic acid raw materials with other additives (such as catalysts, stabilizers, and other auxiliaries) to produce high-purity ultra-refined adipic acid products. This unit needs to meet the production requirements of high precision, high purity, and high stability to ensure that the product quality reaches the ultra-refined standard. It also requires precise temperature control to avoid crystallization caused by temperature fluctuations, which could lead to localized temperature increases and deterioration of some raw materials.

[0003] In the prior art, compared with the Chinese invention disclosed in publication number CN116371342A, there is an apparatus for preparing adipic acid dihydrazide. It has a structure for scraping crystals in the lower chamber, but the volume of the mixing chamber is reduced. During mixing, the upper and lower layers will be separated, making it easier for temperature localization to accumulate. During the later adjustment, the temperature cannot be diffused in time, causing the raw materials to deteriorate. Summary of the Invention

[0004] This invention provides a production apparatus for ultra-refined adipic acid to solve the technical problem that crystals precipitate and adhere to the cooling pipes during the stirring production of ultra-refined adipic acid, making it impossible to adjust the production temperature in time and causing some raw materials to deteriorate.

[0005] The present invention provides a production apparatus for ultra-refined adipic acid, which adopts the following technical solution: It includes a mixing mechanism for processing raw materials, a heating mechanism for heat preservation, and a control mechanism for control. The heating mechanism is enclosed outside the mixing mechanism, and its bottom is fixed to a base. A control mechanism is installed at the front end of the base. A power mechanism for providing power is installed at the top of the mixing mechanism. It also includes a stirring and cooling mechanism for mixing the raw materials and an agitation mechanism for adjusting the state of the stirring and cooling mechanism. The stirring and cooling mechanism is installed inside the mixing mechanism and on the main shaft of the power mechanism. The agitation mechanism is installed at the cooling pipe position of the stirring and cooling mechanism. A state adjustment mechanism is installed on the agitation mechanism. At the bottom, a state adjustment mechanism is installed on the top of the stirring mechanism to drive the state change of the stirring mechanism; the stirring and cooling mechanism includes a stirring frame, with several sets of horizontal frames installed horizontally at the upper and lower ends of the stirring frame. The horizontal frames are arranged in a circumferential array on the stirring frame, with the upper and lower corresponding horizontal frames forming a group. Several cooling pipes are installed vertically on each group of stirring frames. The stirring mechanism includes a spiral blade, which is wrapped around the cooling pipe and is rotatably connected to the cooling pipe. A blade power assembly that drives the spiral blade to rotate is installed at the upper end of the spiral blade. A bottom engagement gear set is connected to the bottom of the spiral blade. The state engagement mechanism is used to coordinate with the stirring and cooling mechanism and the bottom engagement gear set to change the spiral blade between two states.

[0006] Furthermore, both the mixing frame and the cross frame have chambers for transmitting coolant inside. Cooling pipes are connected to the chambers. In the first state, the spiral blades have a gap with the cooling pipes and rotate without restriction to assist in mixing the raw materials. In the second state, the spiral blades are in close contact with the surface of the cooling pipes and scrape the surface of the cooling pipes when rotating. A cooling pipe connector is slidably fitted on the top of the mixing frame. A cooling circulation pipe assembly is installed on the top of the cooling pipe connector. The cooling pipe connector is fixedly installed on the sealing cover of the mixing mechanism.

[0007] Furthermore, the blade power assembly includes a top mating gear set, a drive gear, and a mating gear ring. The top mating gear set is fixed to the upper end of the helical blade and consists of several meshing gears. One of the gears has a drive gear on its upper side. The drive gear and its corresponding gear are mated through a transmission gear. The drive gear and its corresponding gear have tooth blocks formed on them to form the transmission gear. A mating gear ring is set on the outer side of the drive gear and on the bottom surface of the sealing cover. A magnetic block of the state adjustment mechanism is installed on the top of the drive gear. Several electromagnets are arranged in a circumferential array on the sealing cover corresponding to the position of the magnetic block. The top mating gear set and the bottom mating gear set are rotatably connected to the cooling pipe.

[0008] Furthermore, the drive gear and the transmission gear below it are connected to the cross frame via a pin, and the drive gear slides up and down to engage with the gear ring.

[0009] Furthermore, the state coordination mechanism includes a support spring, an adjusting gear, and resistance blocks. The main shaft passes through the stirring frame and has bottom stirring blades at the bottom. The stirring frame is slidably connected to the main shaft via a spline. A support spring is provided between the bottom of the stirring frame and the bottom stirring blades. The adjusting gear is rotatably connected to the outside of the stirring frame. Four resistance blocks are arranged in a circular array inside the stirring frame corresponding to the position of the adjusting gear. A compression ring is fixedly connected to the main shaft at a position slightly below the resistance blocks.

[0010] Furthermore, the top surface of the extrusion ring and the inner side of the resistance block, corresponding to the end face of the extrusion ring, are both chamfered.

[0011] Furthermore, the resistance block is made of rubber.

[0012] Furthermore, adjacent helical blades have opposite helical directions, and the helical blades are made of copper.

[0013] Furthermore, the gap between the inner side of the spiral blade and the cooling pipe is greater than 0 mm and less than or equal to 10 mm.

[0014] Furthermore, the mixing mechanism also includes a sealed tank, with a sealing cap fixed to the top of the sealed tank, an external feed pipe on one side of the sealed tank, and a discharge pipe at the bottom of the sealed tank. The heating mechanism includes an electrically heated heat preservation tank and a temperature controller that are wrapped around the outside of the sealed tank.

[0015] The beneficial effects of this invention are: by using a spiral blade set on the surface of the cooling pipe in conjunction with a blade power mechanism to adjust the state of the spiral blade, the spiral blade can be randomly changed under suitable conditions, thereby improving the replacement between the upper and lower layers of raw materials and increasing the stirring efficiency. If crystallization occurs, the state of the spiral blade can be adjusted in time to clean the surface of the cooling pipe, avoiding the problem of raw material deterioration caused by local overheating and inability to adjust in time. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of an embodiment of an ultra-refined adipic acid production apparatus according to the present invention;

[0018] Figure 2 This is a schematic diagram of the internal structure of a sealed tank in an embodiment of an ultra-refined adipic acid production apparatus of the present invention;

[0019] Figure 3This is a schematic diagram of the stirring and cooling mechanism structure of an embodiment of an ultra-refined adipic acid production apparatus according to the present invention;

[0020] Figure 4 This is a detailed layout diagram of the stirring and cooling mechanism and the state adjustment mechanism of an embodiment of an ultra-refined adipic acid production apparatus according to the present invention;

[0021] Figure 5 This is a schematic diagram of the state-fitting mechanism installation structure of an embodiment of an ultra-refined adipic acid production apparatus according to the present invention;

[0022] Figure 6 This is a schematic diagram of the internal structure of the adjusting gear in an embodiment of an ultra-refined adipic acid production apparatus according to the present invention.

[0023] Figure 7 This is a front view of the internal adjustment gear of an embodiment of an ultra-refined adipic acid production apparatus according to the present invention;

[0024] Figure 8 This is a schematic diagram of the first state structure of the spiral blade when the drive gear is in a high position, according to an embodiment of the ultra-refined adipic acid production apparatus of the present invention.

[0025] Figure 9 This is a schematic diagram of the second state structure of the spiral blades when the drive gear is in the lower position, according to an embodiment of the ultra-refined adipic acid production apparatus of the present invention.

[0026] Figure 10 This is a schematic diagram of the electromagnet distribution structure of an embodiment of an ultra-refined adipic acid production apparatus according to the present invention.

[0027] In the diagram: 1. Mixing mechanism; 2. Power mechanism; 3. Heating mechanism; 4. Control mechanism; 5. Stirring and cooling mechanism; 6. Agitation mechanism; 7. State coordination mechanism; 8. State adjustment mechanism; 11. Sealed tank; 12. Sealed cover; 13. External feed pipe; 14. Discharge pipe; 21. Main shaft; 22. Bottom stirring blades; 51. Stirring frame; 52. Horizontal frame; 53. Cooling pipe connector; 54. Cooling circulation pipe assembly; 55. Cooling pipe; 61. Spiral blades; 62. Top gear assembly; 63. Drive gear; 64. Bottom gear assembly; 65. Gear ring; 71. Support spring; 72. Adjusting gear; 73. Resistance block; 74. Extrusion ring; 81. Magnetic block; 82. Electromagnet. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] An embodiment of the production apparatus for ultrapure adipic acid of the present invention, such as... Figures 1 to 10 As shown, it includes a mixing mechanism 1 for processing raw materials, a heating mechanism 3 for heat preservation, and a control mechanism 4 for control. The heating mechanism 3 is wrapped around the outside of the mixing mechanism 1, and the bottom of the heating mechanism 3 is fixed on the base. The control mechanism 4 is installed at the front end of the base. The power mechanism 2 for providing power is installed on the top of the mixing mechanism 1. It also includes a stirring and cooling mechanism 5 for mixing raw materials and an agitation mechanism 6 for adjusting the state of the stirring and cooling mechanism 5. The stirring and cooling mechanism 5 is installed inside the mixing mechanism 1 and on the main shaft 21 of the power mechanism 2. The agitation mechanism 6 is installed at the cooling pipe 55 of the stirring and cooling mechanism 5. The state coordination mechanism 7 is installed at the bottom of the agitation mechanism 6. The state adjustment mechanism 8 for driving the state change of the agitation mechanism 6 is installed on the top of the agitation mechanism 6.

[0030] The stirring and cooling mechanism 5 includes a stirring frame 51. Three sets of horizontal frames 52 are installed horizontally at the upper and lower ends of the stirring frame 51. The horizontal frames 52 are arranged in a circular array on the stirring frame 51. The corresponding upper and lower horizontal frames 52 form a group. Two cooling pipes 55 are installed vertically on each group of stirring frames 51. The stirring mechanism 6 includes a spiral blade 61. The spiral blade 61 is wrapped around the cooling pipe 55 and is rotatably connected to the cooling pipe 55. A blade power assembly that drives the spiral blade 61 to rotate is installed at the upper end of the spiral blade 61. A bottom engagement gear set 64 is connected to the bottom of the spiral blade 61. The state engagement mechanism 7 is used to coordinate the stirring and cooling mechanism 5 and the bottom engagement gear set 64 to change the spiral blade 61 between two states.

[0031] In this embodiment, both the stirring frame 51 and the cross frame 52 have chambers for transmitting coolant inside. The cooling pipe 55 is connected to the chamber. The first state of the spiral blade 61 is that there is a gap between it and the cooling pipe 55 and it rotates without restriction to assist in stirring the raw materials. The second state of the spiral blade 61 is that it is in close contact with the surface of the cooling pipe 55 and scrapes the surface of the cooling pipe 55 when it rotates. The top of the stirring frame 51 is slidably fitted with a cooling pipe connecting seat 53. A cooling circulation pipe assembly 54 is installed on the top of the cooling pipe connecting seat 53. The cooling pipe connecting seat 53 is fixedly installed on the sealing cover 12 of the mixing mechanism 1.

[0032] In this embodiment, the blade power assembly includes a top engaging gear set 62, a drive gear 63, and a engaging gear ring 65. The top engaging gear set 62 is fixed to the upper end of the helical blade 61. The top engaging gear set 62 consists of two meshing gears, one of which has a drive gear 63 on its upper side. The drive gear 63 and its corresponding gear are engaged through a transmission gear. The drive gear 63 and its corresponding gear have tooth blocks formed on them to engage the transmission gear. A engaging gear ring 65 is provided on the outer side of the drive gear 63 and on the bottom surface of the sealing cover 12. A magnetic block 81 of a state adjustment mechanism 8 is installed on the top of gear 63. Several electromagnets 82 are arranged in a circular array on the sealing cover 12 corresponding to the position of the magnetic block 81. The top gear set 62 and the bottom gear set 64 are rotatably connected to the cooling pipe 55. When the stirring frame 51 and the cross frame 52 drive the top gear set 62 and the drive gear 63 to rotate, the drive gear 63 engages with the gear ring 65, so that the rotational power of the drive gear 63 drives the top gear set 62 to rotate through the transmission gear, and the spiral blade 61 rotates to agitate the raw materials.

[0033] In this embodiment, the drive gear 63 and the transmission gear below it are connected to the cross frame 52 by a pin, and the drive gear 63 slides up and down to engage with the gear ring 65.

[0034] In this embodiment, the state-coordination mechanism 7 includes a support spring 71, an adjusting gear 72, and resistance blocks 73. The main shaft 21 passes through the stirring frame 51 and has bottom stirring blades 22 at its bottom. The stirring frame 51 is slidably connected to the main shaft 21 via a spline. A support spring 71 is provided between the bottom of the stirring frame 51 and the bottom stirring blades 22. The adjusting gear 72 is rotatably connected to the outside of the stirring frame 51. Four resistance blocks 73 are arranged in a circular array inside the stirring frame 51 corresponding to the position of the adjusting gear 72. A compression ring 74 is fixedly connected to the main shaft 21 at a position slightly below the resistance blocks 73. When the stirring frame 51 descends, the resistance blocks 74 inside the stirring frame 51... The resistance block 73 is squeezed by the compression ring 74. At this time, the resistance block 73 expands outward and rubs against the support spring 71. After the support spring 71 receives friction, its rotation speed slows down. The same resistance is transmitted to the bottom engagement gear set 64. The bottom of the spiral blade 61 receives resistance, and the top of the spiral blade 61 receives power from the top engagement gear set 62 to continue rotating. Due to the characteristics of the spring, when the spring twists in the spiral direction, the inner diameter of the spiral blade 61 will shrink inward. At this time, the inner side of the spiral blade 61 is in close contact with the cooling pipe 55 and rotates at the same time. The crystals adhering to the surface of the cooling pipe 55 are scraped off.

[0035] In this embodiment, the top surface of the extrusion ring 74 and the inner side of the resistance block 73 corresponding to the end face of the extrusion ring 74 are both formed with chamfers to facilitate the cooperation between the resistance block 73 and the resistance block 73 when it descends.

[0036] In this embodiment, the resistance block 73 is made of rubber.

[0037] In this embodiment, adjacent spiral blades 61 have opposite spiral directions. The spiral blades 61 are made of copper, which has better heat conduction and is also tough and easy to deform.

[0038] In this embodiment, the gap between the inner side of the spiral blade 61 and the cooling pipe 55 is greater than 0 mm and less than or equal to 10 mm.

[0039] In this embodiment, the mixing mechanism 1 also includes a sealed tank 11, a sealing cover 12 fixed to the top of the sealed tank 11, an external feed pipe 13 provided on one side of the sealed tank 11, a discharge pipe 14 provided at the bottom of the sealed tank 11, and a heating mechanism 3 including an electric heating and heat preservation tank and a temperature controller that are wrapped around the outside of the sealed tank 11.

[0040] The working principle is as follows: After the raw materials are poured into the sealed tank 11, the motor of the power mechanism 2 is started, and the stirring frame 51 is rotated as a whole through the main shaft 21. At this time, the drive gear 63 engages with the mating gear ring 65, so that the rotation power of the drive gear 63 drives the top mating gear set 62 to rotate through the transmission gear, so that the spiral blade 61 rotates and stirs the raw materials. At this time, the spiral blade 61 is in the first state. There is a gap between the spiral blade 61 and the cooling pipe 55 and it can rotate without restriction, thereby assisting in stirring the raw materials.

[0041] Simultaneously, by detecting the internal raw material temperature, the energization state of the electromagnet 82 is controlled. For example, by controlling the electromagnet 82 to generate a magnetic pole with the same pole as the magnetic block 81, the top gear set 62 descends, following the entire stirring and cooling mechanism 5. During the descent, the resistance block 73 inside the stirring frame 51 is squeezed by the extrusion ring 74. At this time, the resistance block 73 expands outward and rubs against the support spring 71. After the support spring 71 receives friction, its rotation speed slows down. The same resistance is transmitted to the bottom gear set 64, so the bottom of the spiral blade 61 receives resistance, and the top of the spiral blade 61 receives power from the top gear set 62 to continue rotating. Due to the characteristics of the spring, when the spring twists in the spiral direction, the inner diameter of the spiral blade 61 will shrink inward. At this time, the inner side of the spiral blade 61 is in close contact with the cooling pipe 55 and rotates at the same time, so the crystals adhering to the surface of the cooling pipe 55 are scraped off.

[0042] Alternatively, the electromagnets 82 in the circular array can be controlled to intermittently change their magnetic poles, causing the stirring rack 51 to float up and down during rotation, thereby randomly changing the state of the spiral blades 61 and improving the stirring power. Under normal circumstances, the cooling pipe 55 does not pass through the cooling chamber, and the sealed tank 11 only relies on the heating mechanism 3 to ensure the mixing of ultra-refined adipic acid. If a sudden temperature rise occurs, the cooling pipe 55 is used to mix the mixture with cooling water. During the mixing process, the raw materials may crystallize rapidly due to the sudden temperature drop, causing instantaneous crystallization on the surface of the cooling pipe 55. At this time, the increased weight caused by the instantaneous crystallization on the surface of the cooling pipe 55 can cause the stirring rack 51 to sink, thereby causing the spiral blades 61 to also enter a second state.

[0043] 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 within the protection scope of the present invention.

Claims

1. A production apparatus for ultra-refined adipic acid, comprising a mixing mechanism (1) for processing raw materials, a heating mechanism (3) for heat preservation, and a control mechanism (4) for control, wherein the heating mechanism (3) is wrapped around the mixing mechanism (1), the bottom of the heating mechanism (3) is fixed on a base, the control mechanism (4) is installed at the front end of the base, and a power mechanism (2) for providing power is installed on the top of the mixing mechanism (1), characterized in that: It also includes a mixing and cooling mechanism (5) for mixing raw materials and an agitation mechanism (6) for providing state adjustment for the mixing and cooling mechanism (5). The mixing and cooling mechanism (5) is installed inside the mixing mechanism (1) and on the main shaft (21) of the power mechanism (2). The agitation mechanism (6) is installed at the cooling pipe (55) position of the mixing and cooling mechanism (5). The state coordination mechanism (7) is installed at the bottom of the agitation mechanism (6). The top of the agitation mechanism (6) is equipped with a state adjustment mechanism (8) that drives the state change of the agitation mechanism (6). The mixing and cooling mechanism (5) includes a mixing frame (51). Several sets of horizontal frames (52) are installed horizontally at the upper and lower ends of the mixing frame (51). The horizontal frames (52) are arranged in a circular array on the mixing frame (51). The upper and lower corresponding horizontal frames (52) form a group. Several cooling pipes (55) are installed vertically on each group of mixing frames (51). The agitation mechanism (6) includes a spiral blade (61). The spiral blade (61) is wrapped around the cooling pipe (55). The cooling pipe (55) is rotatably connected. The upper end of the spiral blade (61) is fitted with a blade power assembly that drives it to rotate. The bottom of the spiral blade (61) is connected with a bottom fitting gear set (64). The state fitting mechanism (7) is used to cooperate with the stirring and cooling mechanism (5) and the bottom fitting gear set (64) to change the spiral blade (61) between two states. The stirring frame (51) and the cross frame (52) are both formed with chambers for transmitting coolant. The cooling pipe (55) is connected to the chamber. The first state of the spiral blade (61) is that there is a gap between it and the cooling pipe (55) and it can rotate without restriction to assist in stirring the raw materials. The second state of the spiral blade (61) is that it is close to the surface of the cooling pipe (55) and scrapes the surface of the cooling pipe (55) when rotating. The top of the stirring frame (51) is slidably fitted with a cooling pipe connecting seat (53). The top of the cooling pipe connecting seat (53) is fitted with a cooling circulation pipe assembly (54). The cooling pipe connecting seat (53) is fixedly installed on the sealing cover (12) of the mixing mechanism (1).

2. The apparatus for producing ultra-refined adipic acid according to claim 1, characterized in that: The blade power assembly includes a top engagement gear set (62), a drive gear (63), and an engagement gear ring (65). The top engagement gear set (62) is fixed to the upper end of the spiral blade (61). The top engagement gear set (62) consists of several meshing gears. One of the gears has a drive gear (63) on its upper side. The drive gear (63) and its corresponding gear are engaged through a transmission gear. The drive gear (63) and its corresponding gear have tooth blocks formed on them to engage the transmission gear. The drive gear (63) is located on the outside of the drive gear (63) and on the bottom surface of the sealing cover (12). The drive gear (63) has a magnetic block (81) of the state adjustment mechanism (8) installed on its top. Several electromagnets (82) are arranged in a circular array on the sealing cover (12) corresponding to the position of the magnetic block (81). The top engagement gear set (62) and the bottom engagement gear set (64) are rotatably connected to the cooling pipe (55).

3. The apparatus for producing ultra-refined adipic acid according to claim 2, characterized in that: The drive gear (63) and the transmission gear below it are connected to the cross frame (52) by a pin shaft. The drive gear (63) slides up and down to engage with the gear ring (65).

4. The apparatus for producing ultra-refined adipic acid according to claim 3, characterized in that: The state coordination mechanism (7) includes a support spring (71), an adjusting gear (72), and a resistance block (73). The main shaft (21) passes through the stirring frame (51) and has a bottom stirring blade (22) at the bottom. The stirring frame (51) is slidably connected to the main shaft (21) via a spline. A support spring (71) is provided between the bottom of the stirring frame (51) and the bottom stirring blade (22). The adjusting gear (72) is rotatably connected to the outside of the stirring frame (51). Four resistance blocks (73) are arranged in a circular array inside the stirring frame (51) corresponding to the position of the adjusting gear (72). A compression ring (74) is fixedly connected to the main shaft (21) at a position slightly below the resistance block (73).

5. The apparatus for producing ultra-refined adipic acid according to claim 4, characterized in that: The top surface of the extrusion ring (74) and the inner side of the resistance block (73) are both chamfered to the end face of the extrusion ring (74).

6. The apparatus for producing ultra-refined adipic acid according to claim 5, characterized in that: The resistance block (73) is made of rubber.

7. The apparatus for producing ultrapure adipic acid according to claim 2, characterized in that: The adjacent helical blades (61) have opposite helical directions, and the helical blades (61) are made of copper.

8. The apparatus for producing ultra-refined adipic acid according to claim 7, characterized in that: The gap between the inner side of the spiral blade (61) and the cooling pipe (55) is greater than 0 mm and less than or equal to 10 mm.

9. The apparatus for producing ultrapure adipic acid according to claim 1, characterized in that: The mixing mechanism (1) also includes a sealed tank (11), a sealing cover (12) fixed to the top of the sealed tank (11), an external feed pipe (13) provided on one side of the sealed tank (11), and a discharge pipe (14) provided at the bottom of the sealed tank (11). The heating mechanism (3) includes an electric heating and heat preservation tank and a temperature controller that are wrapped around the outside of the sealed tank (11).

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