Distillation device for purifying acryloyl chloride

Abstract

The distillation device is applied to the technical field of chemical equipment, chemical raw materials in a heating tank are heated through a heater, then a driving mechanism is started to enable a disc to drive two stirring rods to stir in a reciprocating mode, and the stirring rods stir the chemical raw materials under the action of centrifugal force; according to the chemical raw material purifying device, the connecting shaft can drive the stirring blades to rotate, so that chemical raw materials in the heating tank can be stirred and uniformly heated, the heating rate is increased, the energy consumption is reduced, steam flows into the purifying tank through the coiled pipe, and liquid is formed by the steam under the action of the condensing mechanism and flows into the liquid collecting box; part of the liquid flows towards the periphery of the conical disc through the diversion groove, and the other part of the liquid vertically flows downwards through the leakage groove, so that the liquid can uniformly drop on the filter screen, impurities in the liquid can be filtered through the filter screen, and the purity of acryloyl chloride is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of chemical equipment, and in particular relates to a distillation device for purifying acryloyl chloride. Background Art

[0002] Methacryloyl chloride is a colorless, transparent, clear liquid. Melting point -60°C, boiling point 95-96°C. It can be used as an intermediate in organic synthesis, such as the production of heat-resistant, solvent-resistant, polymerized rubber antioxidants, which requires methacryloyl chloride as an intermediate. The synthesis method of methacryloyl chloride is to use α-methacrylic acid as a raw material, react with liquid phosgene (trichloromethyl chloroformate) or solid phosgene (bis-trichloromethyl carbonate) in the presence of a catalyst, then add a polymerization inhibitor, and distill to obtain the target product. The specific method is: add 0.5% to 2% of the weight of an organic base catalyst and 0.1% to 1% of a polymerization inhibitor to α-methacrylic acid, add solid phosgene or liquid phosgene within 1 hour at room temperature, react at 20 to 75°C for 4 to 10 hours, distill at atmospheric pressure, and collect the fraction at 95 to 98°C. The distillation device is an indispensable equipment for the production of acryloyl chloride.

[0003] Some current distillation devices for purifying acryloyl chloride heat chemical raw materials through a single heater. However, the heating process lacks auxiliary functions, resulting in low efficiency and high energy consumption in heating the raw materials through a single heater. At the same time, there is no filtering structure in the process of steam being condensed into liquid and flowing to the collector through a pipeline, resulting in some impurities in the pipeline causing contamination of the liquid, thereby affecting the purity of acryloyl chloride. Summary of the invention

[0004] The purpose of the present invention is to provide a distillation device for purifying acryloyl chloride, which has the advantages of improving the heating rate of chemical raw materials, reducing energy consumption, facilitating the filtration of liquids, and improving the purity of acryloyl chloride.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions: a distillation device for purifying acryloyl chloride, comprising a heating tank, a purification tank is arranged on one side of the heating tank, a liquid collecting tank is arranged below the purification tank, a serpentine tube is connected to one side of the heating tank, one end of the serpentine tube passes through the bottom of the purification tank and is connected to the top of the liquid collecting tank, a disc is rotatably connected to the top of the inner cavity of the heating tank, a stirring rod is fixedly connected to the bottom of the disc, a connecting shaft is rotatably connected to the inner wall of the stirring rod, a stirring blade is fixedly connected to the outer side of the connecting shaft, a driving mechanism is arranged on the other side of the heating tank, a condensing mechanism is arranged on the top of the purification tank, a filter screen is arranged on the inner wall of the liquid collecting tank, and a mounting mechanism is arranged on the outer side of the filter screen.

[0006] The above technical solution is adopted: open the dust cover to put the chemical raw materials into the heating tank from the feed pipe, then start the heater to heat the chemical raw materials in the heating tank, then start the motor to drive the fixed shaft to rotate, when the fixed shaft rotates, it can respectively drive the first sector gear and the second sector gear to rotate, when the first sector gear and the second sector gear rotate, they can drive the annular gear plate to reciprocate, and then the disc can drive the two stirring rods to reciprocate and stir, when the stirring rods stir, under the action of centrifugal force, the connecting shaft can drive the stirring blades to rotate, so that the chemical raw materials in the heating tank can be stirred, so that they are heated evenly, and the heating rate is increased, and the energy consumption is reduced, the steam flows into the purification tank through the serpentine pipe, and the steam is formed into liquid under the action of the condensation mechanism, and then the water pump is started to extract the cooling water through the water pump hose, and the cooling water is transported to the connecting pipe through the water pipe. Then, it is evenly sprayed onto the serpentine tube from several nozzles, thereby condensing the steam in the serpentine tube to form liquid, and the liquid flows into the collecting box, which improves the condensation efficiency. Impurities in the liquid can be filtered through the filter screen, thereby improving the purity of acryloyl chloride. When the filter screen needs to be cleaned or replaced, the sealing door is opened, and then the pull ring is pulled to make the fixed plate drive the limit rod to move, and the limit rod is separated from the limit hole, thereby releasing the restriction on the filter screen. At this time, the spring is in a stretched state, and then the filter screen can be taken out from the installation track, and then the cleaned filter screen can be installed into the installation track, and then the pull ring is released. The resilience of the spring can make the fixed plate drive the limit rod to automatically reset and insert it into the limit hole to fix the filter screen. The disassembly and assembly is convenient, and it is convenient for personnel to operate. The installation mechanism is convenient for disassembly, cleaning and replacement of the filter screen, which is easy to operate and improves the service life of the filter screen.

[0007] The present invention is further configured as follows: the number of the stirring rods is two, and the two stirring rods are symmetrically arranged.

[0008] The above technical solution is adopted to facilitate reciprocating stirring of the chemical raw materials in the heating tank, so that the chemical raw materials can be heated evenly.

[0009] The present invention is further configured such that a feed pipe is connected to one side of the heating tank, a dust cover is rotatably connected to the top of the feed pipe through a hinge, and a heater is arranged at the bottom of the heating tank.

[0010] The above technical solution is adopted: it is convenient to put the chemical raw materials into the heating tank and heat the chemical raw materials, and it can prevent dust from entering the heating tank to cause pollution.

[0011] The present invention is further configured such that the driving mechanism includes a motor arranged on one side of the heating tank, the output end of the motor is fixedly connected to a fixed shaft, the outer side of the fixed shaft is respectively fixedly connected with a first sector gear and a second sector gear, and one end of the fixed shaft is rotatably connected to the inner wall of the heating tank through a bearing seat.

[0012] The above technical solution facilitates the fixed shaft to maintain stable rotation and drive the first sector gear and the second sector gear to rotate synchronously.

[0013] The present invention is further configured such that the driving mechanism further comprises an annular gear plate fixed to the bottom of the disc, and the first sector gear and the second sector gear are both meshingly connected to the annular gear plate.

[0014] By adopting the above technical solution, the disc can drive the two stirring rods to rotate back and forth, thereby stirring the chemical raw materials in the heating tank, so that the chemical raw materials are heated evenly and the heating rate is improved.

[0015] The present invention is further configured such that the condensation mechanism includes a water pump fixed to the top of the purification tank, the water suction end of the water pump is fixedly connected to a water suction hose via a connecting flange, the water discharge end of the water pump is fixedly connected to a water pipe via a connecting flange, one end of the water pipe passes through the top of the purification tank and is connected to a connecting pipe, and the outer side of the connecting pipe is connected to a nozzle.

[0016] The above technical solution is adopted to facilitate evenly spraying cooling water on the serpentine tube and cool the steam inside the serpentine tube, so as to convert the steam into liquid.

[0017] The present invention is further configured such that the number of the nozzles is multiple and the multiple nozzles are equidistantly arranged.

[0018] The above technical solution is adopted to facilitate the uniform spraying of cooling water on the serpentine tube, thereby improving the condensation efficiency.

[0019] The present invention is further configured such that a conical disk is fixedly connected to the top of the inner cavity of the liquid collecting box through a connecting rod, a diversion groove is opened on the outer side of the conical disk, a leakage groove is opened on the inner wall of the conical disk, and the conical disk is located directly below one end of the serpentine tube.

[0020] The above technical solution is adopted to facilitate the diversion of liquid, so that the downstream liquid flows evenly to the filter net, and prevents impurities in the liquid from accumulating at a certain position of the filter net.

[0021] The present invention is further configured as follows: the mounting mechanism includes a mounting track arranged on the outside of the filter screen, one side of the mounting track is fixedly connected to the inner wall of the liquid collecting tank, a limiting hole is provided on the inner wall of the filter screen, a limiting rod is clamped on the inner wall of the limiting hole, the top of the limiting rod passes through the top of the mounting track and is fixedly connected to a fixing plate, and a spring is arranged on the outside of the limiting rod.

[0022] The above technical solution makes it convenient to disassemble, clean and replace the filter.

[0023] The present invention is further configured such that a pull ring is provided on the top of the fixing plate, one end of the spring is fixedly connected to the top of the mounting track, and the other end of the spring is fixedly connected to the bottom of the fixing plate.

[0024] Adopting the above technical solution: it is convenient to pull the fixing plate to move it.

[0025] In summary, the present invention has the following beneficial effects: 1: Start the heater to heat the chemical raw materials in the heating tank, then start the driving mechanism to make the disc drive the two stirring rods to stir reciprocally. When the stirring rods stir, under the action of centrifugal force, the connecting shaft can drive the stirring blades to rotate, so that the chemical raw materials in the heating tank can be stirred, so that they are heated evenly, and the heating rate is increased, and the energy consumption is reduced. The steam flows into the purification tank through the serpentine pipe, and the steam is transformed into liquid under the action of the condensation mechanism and flows into the liquid collecting tank.

[0026] 2: The liquid in the serpentine tube flows to the conical disk, part of the liquid flows to the surrounding of the conical disk through the diverter slot, and the other part of the liquid flows vertically downward through the drain slot, so that it can drip evenly on the filter net. The impurities in the liquid can be filtered through the filter net, thereby improving the purity of acryloyl chloride. When the filter net needs to be cleaned or replaced, pull the pull ring to make the fixed plate drive the limit rod to move, and separate the limit rod from the limit hole, thereby releasing the restriction on the filter net. At this time, the spring is in a stretched state, and then the filter net can be taken out from the installation track, and then the cleaned filter net can be installed in the installation track, and then the pull ring can be released. The resilience of the spring can make the fixed plate drive the limit rod to automatically reset and insert it into the limit hole to fix the filter net. The disassembly and assembly are convenient, and it is convenient for personnel to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a structural schematic diagram of the driving mechanism of the present invention; Figure 3 It is a structural schematic diagram of the condensation mechanism of the present invention; Figure 4 The present invention Figure 3 A schematic diagram of the structure enlargement in the middle; Figure 5 It is a schematic structural diagram of the conical disk of the present invention.

[0028] Figure numerals: 1. Heating tank; 101. Feed pipe; 102. Heater; 2. Purification tank; 3. Liquid collecting box; 4. Serpentine pipe; 5. Disc; 6. Stirring rod; 7. Connecting shaft; 8. Stirring blade; 9. Motor; 10. Fixed shaft; 11. First sector gear; 12. Second sector gear; 13. Annular gear plate; 14. Filter screen; 15. Water pump; 16. Suction hose; 17. Water pipe; 18. Connecting pipe; 19. Nozzle; 20. Conical disc; 21. Diverter trough; 22. Leakage trough; 23. Mounting track; 24. Limit hole; 25. Limit rod; 26. Fixed plate; 27. Spring. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the protection scope of the present invention. It is understood that the drawings are only provided for reference and illustration, and are not used to limit the present invention. The connection relationship shown in the drawings is only for the convenience of clear description and does not limit the connection method.

[0030] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to another component, or there may be an intermediate component at the same time. Unless otherwise defined, all technical and scientific terms used in this document have the same meaning as those generally understood by technicians in the technical field of the present invention. It should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0031] Example 1: Reference Figure 1 , Figure 2 and Figure 3A distillation device for purifying acryloyl chloride comprises a heating tank 1, a purification tank 2 is arranged on one side of the heating tank 1, a drainage pipe is connected to one side of the purification tank 2, a valve is arranged on the outside of the drainage pipe, a liquid collecting tank 3 is arranged below the purification tank 2, a serpentine pipe 4 is connected to one side of the heating tank 1, one end of the serpentine pipe 4 passes through the bottom of the purification tank 2 and is connected to the top of the liquid collecting tank 3, a disc 5 is rotatably connected to the top of the inner cavity of the heating tank 1, a stirring rod 6 is fixedly connected to the bottom of the disc 5, a connecting shaft 7 is rotatably connected to the inner wall of the stirring rod 6, a stirring blade 8 is fixedly connected to the outside of the connecting shaft 7, a driving mechanism is arranged on the other side of the heating tank 1, and a condensing mechanism is arranged on the top of the purification tank 2.

[0032] Referring to 2 , there are two stirring rods 6 , and the two stirring rods 6 are symmetrically arranged.

[0033] refer to Figure 1 and Figure 2 A feed pipe 101 is connected to one side of the heating tank 1. A dust cover is rotatably connected to the top of the feed pipe 101 through a hinge. A heater 102 is provided at the bottom of the heating tank 1. The dust cover can prevent dust from entering the heating tank 1 from the feed pipe 101 and causing pollution. The heater 102 can be used to heat the chemical raw materials in the heating tank 1.

[0034] refer to Figure 1 and Figure 2 The driving mechanism includes a motor 9 arranged on one side of the heating tank 1, the output end of the motor 9 is fixedly connected to the fixed shaft 10, the outer side of the fixed shaft 10 is respectively fixedly connected with a first sector gear 11 and a second sector gear 12, and one end of the fixed shaft 10 is rotatably connected to the inner wall of the heating tank 1 through a bearing seat.

[0035] refer to Figure 2 The driving mechanism further includes an annular gear plate 13 fixed to the bottom of the disc 5 , and the first sector gear 11 and the second sector gear 12 are both meshedly connected to the annular gear plate 13 .

[0036] refer to Figure 1 and Figure 3 The condensation mechanism includes a water pump 15 fixed on the top of the purification tank 2, the water suction end of the water pump 15 is fixedly connected to a water suction hose 16 through a connecting flange, and the water discharge end of the water pump 15 is fixedly connected to a water pipe 17 through a connecting flange. One end of the water pipe 17 passes through the top of the purification tank 2 and is connected to a connecting pipe 18, and the outer side of the connecting pipe 18 is connected to a nozzle 19.

[0037] refer to Figure 3 The number of the nozzles 19 is several, and the nozzles 19 are arranged at equal intervals.

[0038] Among them, one end of the water suction hose 16 is connected to the external water source, and then the water pump 15 is started to extract the cooling water through the water suction hose 16, and the cooling water 16 is transported to the connecting pipe 18 through the water pipe 17, and finally sprayed evenly onto the serpentine pipe 4 from a plurality of nozzles 19, so as to condense the steam in the serpentine pipe 4 to form liquid, thereby improving the condensation efficiency, and finally the valve is opened to discharge the cooling water from the drain pipe.

[0039] A brief description of the use process: open the dust cover and put the chemical raw materials into the heating tank 1 from the feed pipe 101, then start the heater 102 to heat the chemical raw materials in the heating tank 1, and then start the motor 9 to drive the fixed shaft 10 to rotate. When the fixed shaft 10 rotates, it can respectively drive the first sector gear 11 and the second sector gear 12 to rotate. When the first sector gear 11 and the second sector gear 12 rotate, they can drive the annular gear plate 13 to reciprocate, and then the disc 5 can drive the two stirring rods 6 to reciprocate and stir. When the stirring rod 6 stirs, under the action of centrifugal force, the connecting shaft 7 can drive the stirring blade 8 to rotate, so that the chemical raw materials in the heating tank 1 can be stirred, so that they are heated evenly, and the heating rate is increased, and the energy consumption is reduced. The steam flows into the purification tank 2 through the serpentine pipe 4, and the steam is converted into liquid under the action of the condensation mechanism.

[0040] Example 2: Reference Figure 1 , Figure 3 and Figure 5 A distillation device for purifying acryloyl chloride comprises a heating tank 1, a purification tank 2 is arranged on one side of the heating tank 1, a liquid collecting box 3 is arranged below the purification tank 2, a filter screen 14 is arranged on the inner wall of the liquid collecting box 3, a mounting mechanism is arranged on the outer side of the filter screen 14, a drain pipe is connected to one side of the liquid collecting box 3, and a one-way valve is arranged on the outer side of the drain pipe.

[0041] Among them, one side of the liquid collecting tank 3 is connected to a sealed door by rotating through a hinge, and the other side of the liquid collecting tank 3 is provided with an observation window, and scale lines are provided on the observation window. Through the observation window and the scale lines, personnel can easily know the liquid level height in the liquid collecting tank 3. By opening the one-way valve, the liquid in the liquid collecting tank 3 can be discharged from the drain pipe.

[0042] refer to Figure 3 and Figure 5 The top of the inner cavity of the collecting box 3 is fixedly connected with a conical disk 20 through a connecting rod. A diversion groove 21 is opened on the outer side of the conical disk 20, and a leakage groove 22 is opened on the inner wall of the conical disk 20. The conical disk 20 is located directly below one end of the serpentine tube 4.

[0043] refer to Figure 4The mounting mechanism includes a mounting track 23 arranged on the outside of the filter screen 14, one side of the mounting track 23 is fixedly connected to the inner wall of the liquid collecting box 3, a limiting hole 24 is provided on the inner wall of the filter screen 14, a limiting rod 25 is clamped on the inner wall of the limiting hole 24, the top of the limiting rod 25 passes through the top of the mounting track 23 and is fixedly connected to a fixing plate 26, and a spring 27 is provided on the outside of the limiting rod 25.

[0044] refer to Figure 4 A pull ring is provided at the top of the fixing plate 26 , one end of the spring 27 is fixedly connected to the top of the mounting track 23 , and the other end of the spring 27 is fixedly connected to the bottom of the fixing plate 26 .

[0045] When the filter 14 needs to be cleaned or replaced, the sealing door is opened, and then the pull ring is pulled to make the fixing plate 26 drive the limiting rod 25 to move, and the limiting rod 25 is separated from the limiting hole 24, thereby releasing the restriction on the filter 14. At this time, the spring 27 is in a stretched state, and then the filter 14 is taken out from the mounting track 23, and then the cleaned filter 14 is installed into the mounting track 23, and then the pull ring is released. The rebound force of the spring 27 can make the fixing plate 26 drive the limiting rod 25 to automatically reset and insert it into the limiting hole 24, thereby fixing the filter 14. The disassembly and assembly are convenient, and it is convenient for personnel to operate.

[0046] Brief description of the use process: the liquid in the serpentine tube 4 flows onto the conical disk 20, part of the liquid flows to the surrounding of the conical disk 20 through the diverter groove 21, and the other part of the liquid flows vertically downward through the leakage groove 22, so that it can flow evenly to the filter screen 14. The impurities in the liquid can be filtered through the filter screen 14, thereby improving the purity of the acryloyl chloride. The installation mechanism facilitates the disassembly, cleaning and replacement of the filter screen 14, which is easy to operate and improves the service life of the filter screen 14.

[0047] In the above detailed description, reference is made to the accompanying drawings, which form a part of this document. In the accompanying drawings, similar symbols typically identify similar components unless the context indicates otherwise. The illustrated embodiments described in the detailed description, drawings, and claims are not meant to be limiting. Other embodiments may be used, and other changes may be made, without departing from the spirit or scope of the subject matter presented herein.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A distillation apparatus for purifying acryloyl chloride, comprising a heating tank (1), characterized in that: A purification tank (2) is arranged on one side of the heating tank (1), a liquid collecting tank (3) is arranged below the purification tank (2), a serpentine tube (4) is connected to one side of the heating tank (1), one end of the serpentine tube (4) passes through the bottom of the purification tank (2) and is connected to the top of the liquid collecting tank (3), a disc (5) is rotatably connected to the top of the inner cavity of the heating tank (1), a stirring rod (6) is fixedly connected to the bottom of the disc (5), a connecting shaft (7) is rotatably connected to the inner wall of the stirring rod (6), a stirring blade (8) is fixedly connected to the outer side of the connecting shaft (7), a driving mechanism is arranged on the other side of the heating tank (1), a condensing mechanism is arranged on the top of the purification tank (2), a filter screen (14) is arranged on the inner wall of the liquid collecting tank (3), and a mounting mechanism is arranged on the outer side of the filter screen (14).

2. A distillation apparatus for purifying acryloyl chloride according to claim 1, characterized in that: The number of the stirring rods (6) is two, and the two stirring rods (6) are symmetrically arranged.

3. A distillation apparatus for purifying acryloyl chloride according to claim 1, characterized in that: One side of the heating tank (1) is connected to a feed pipe (101), the top of the feed pipe (101) is rotatably connected to a dust cover via a hinge, and a heater (102) is provided at the bottom of the heating tank (1).

4. A distillation apparatus for purifying acryloyl chloride according to claim 1, characterized in that: The driving mechanism comprises a motor (9) arranged on one side of the heating tank (1); an output end of the motor (9) is fixedly connected to a fixed shaft (10); a first sector gear (11) and a second sector gear (12) are respectively fixedly connected to the outer side of the fixed shaft (10); and one end of the fixed shaft (10) is rotatably connected to the inner wall of the heating tank (1) via a bearing seat.

5. A distillation apparatus for purifying acryloyl chloride according to claim 4, characterized in that: The driving mechanism further comprises an annular gear plate (13) fixed to the bottom of the disc (5), and the first sector gear (11) and the second sector gear (12) are both meshingly connected to the annular gear plate (13).

6. A distillation apparatus for purifying acryloyl chloride according to claim 1, characterized in that: The condensation mechanism comprises a water pump (15) fixed to the top of the purification tank (2); a water suction end of the water pump (15) is fixedly connected to a water suction hose (16) via a connecting flange; a water discharge end of the water pump (15) is fixedly connected to a water delivery pipe (17) via a connecting flange; one end of the water delivery pipe (17) passes through the top of the purification tank (2) and is connected to a connecting pipe (18); the outer side of the connecting pipe (18) is connected to a nozzle (19).

7. A distillation apparatus for purifying acryloyl chloride according to claim 6, characterized in that: The number of the nozzles (19) is a plurality, and the plurality of nozzles (19) are arranged at equal distances.

8. The distillation apparatus for purifying acryloyl chloride according to claim 1, characterized in that: A conical disk (20) is fixedly connected to the top of the inner cavity of the liquid collecting box (3) via a connecting rod, a diversion groove (21) is provided on the outer side of the conical disk (20), a leakage groove (22) is provided on the inner wall of the conical disk (20), and the conical disk (20) is located directly below one end of the serpentine tube (4).

9. A distillation apparatus for purifying acryloyl chloride according to claim 1, characterized in that: The mounting mechanism comprises a mounting track (23) arranged on the outside of the filter screen (14); one side of the mounting track (23) is fixedly connected to the inner wall of the liquid collecting box (3); a limiting hole (24) is provided on the inner wall of the filter screen (14); a limiting rod (25) is clamped on the inner wall of the limiting hole (24); the top of the limiting rod (25) passes through the top of the mounting track (23) and is fixedly connected to a fixing plate (26); and a spring (27) is provided on the outer side of the limiting rod (25).

10. A distillation apparatus for purifying acryloyl chloride according to claim 9, characterized in that: A pull ring is provided at the top of the fixing plate (26), one end of the spring (27) is fixedly connected to the top of the mounting track (23), and the other end of the spring (27) is fixedly connected to the bottom of the fixing plate (26).

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