Purification process of propyl acetate

Abstract

The present invention discloses a propyl acetate purification process, and relates to the technical field of propyl acetate purification, the purification process specifically comprises the following steps: step 1, adding a product of an esterification reaction of acetic acid and propanol into a purification device, and using the purification device to perform drying treatment on the product to remove most of water therein; 2, the dried product enters purification equipment to be subjected to distillation treatment, propyl acetate is evaporated before water, and therefore water-liquid separation is achieved; and step 3, after propyl acetate in the product forms steam, condensing by utilizing purification equipment, and finally realizing purification of propyl acetate. The operation cost of the drying process can be remarkably reduced, especially for industrial application needing a large amount of drying, meanwhile, through the hot air action of the first air scoop and the second air scoop, the dried particles can be fully dried, it is ensured that the water absorption performance of the dried particles is recovered, and therefore recycling is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of propyl acetate purification, in particular to a purification process of propyl acetate. Background Art

[0002] Propyl acetate is the reaction product of acetic acid and propanol, wherein the product also contains water. Therefore, when producing propyl acetate, propyl acetate needs to be separated and purified.

[0003] After searching, the Chinese patent document with publication number CN104592018B discloses a method for synthesizing isopropyl acetate by reaction-reaction intensification, wherein acetic acid, concentrated sulfuric acid and isopropyl alcohol are added to a homogeneous reactor, and the acetic acid and isopropyl alcohol in the homogeneous reactor react under the action of concentrated sulfuric acid to generate isopropyl acetate and water; in a fixed bed reactor, the unreacted isopropyl alcohol continues to react with the acetic acid vapor and the acetic acid refluxed in the catalyst to generate isopropyl acetate and water, and the azeotrope of isopropyl acetate and water enters the inner cooler for condensation; the synthesized product enters the water-oil separator, the water phase enters the wastewater tank, and the oil phase enters the crude product tank to obtain crude isopropyl acetate, which is to be purified and refined. This patent makes the raw material conversion rate high, the product is easy to separate, the catalyst concentrated sulfuric acid and alumina-loaded polystyrene sulfonate resin catalyst used have a long operation cycle, can be recycled and reused, the process is simple, the operation is safe and stable, and the system consumes less energy.

[0004] However, the above invention has the following shortcomings: currently, when there is water in the reaction product, a desiccant is used to pre-treat the product to remove most of the water therein, and then distillation separation is performed to ensure the purification efficiency. However, in the prior art, in order to ensure the drying effect of the reaction product, a large dose of drying particles is used. At the same time, the traditional drying method may take a long time to complete the drying process, which will extend the cycle of the entire pre-purification process and affect the production efficiency; and since it is impossible to quickly put the dried particles into circulation, the cost of the entire pre-purification process is also high, so there are limitations. Summary of the invention

[0005] The object of the present invention is to provide a purification process for propyl acetate to solve the problems raised in the above background technology.

[0006] The technical solution of the present invention is: a purification process of propyl acetate, which specifically comprises the following steps:

[0007] Step 1: adding the product of the esterification reaction of acetic acid and propanol to a purification device, and using the purification device to first dry the product to remove most of the water therein;

[0008] Step 2: the dried product enters a purification device for distillation, wherein propyl acetate evaporates before water, thereby achieving separation of the water liquid;

[0009] Step 3: After the propyl acetate in the product forms steam, it is condensed using a purification device to finally purify the propyl acetate;

[0010] The purification equipment in steps 1 to 3 includes a base, a distillation tank and a drying plate are arranged above the base, a plurality of drying chambers with equal distances are opened on the drying plate, and a mesh plate is rotatably installed on the inner bottom of each drying chamber, and dry particles are placed in the drying chamber, and an air scoop 2 and an air scoop 1 are respectively arranged at the upper and lower ends of one side of the drying plate, and a liquid receiving hopper is arranged at the bottom of the other side of the drying plate, and the tops of the air scoop 1 and the liquid receiving hopper are both in contact with the bottom of the drying plate, and a coaxially arranged liquid supply pipe is arranged above the liquid receiving hopper, and one end of the liquid supply pipe is fixedly connected to an external product supply system. The system comprises: an extension end ring is fixedly provided at the end of the liquid supply pipe, and an extension shaft is rotatably installed on one side of the extension end ring, one end of the extension shaft is fixedly connected with a flap, and the other end of the extension shaft is fixedly installed with a driven gear, the extension end ring is provided with a cavity one and a cavity two, and a rack meshing with the driven gear is slidably installed in the cavity one and the cavity two, an arc head block is fixedly installed at the bottom end of the rack, and a reset spring two is fixedly connected between one side of the arc head block and the cavity two, and a plurality of arc surface convex blocks staggered with the drying bin are fixedly provided on the top of the drying plate, and the arc surface convex blocks are used to conflict with the arc head block.

[0011] Preferably, a heating sleeve is fixedly mounted on the outer peripheral wall of the bottom of the distillation tank, and a spiral heating wire is fixedly mounted on the heating sleeve, and a bracket is fixedly mounted between the heating sleeve and the base.

[0012] Preferably, an air supply pipe is fixedly connected between one side of the heating sleeve and wind scoop one, a branch pipe is fixedly connected between one side of the air supply pipe and wind scoop two, a booster air pump is fixedly installed on the branch pipe, a fan is fixedly installed on the top outer wall of the base, and an air supply pipe is fixedly connected between the output end of the fan and the heating sleeve.

[0013] Preferably, an annular rod is fixedly installed on the inner circumferential wall of one end of the wind bucket, and an annular groove plate is slidably sleeved on the annular rod, a blade frame is fixedly installed on the inner wall of the annular groove plate, and an arc head block is fixedly installed on the top of the blade frame, a storage cavity is opened on the arc head block, and an arc head block is slidably installed inside the storage cavity, and a pair of return springs are fixedly installed between the bottom of the arc head block and the bottom of the storage cavity.

[0014] Preferably, a slot matching the arc head block is provided at the bottom of the mesh plate.

[0015] Preferably, a blade frame 2 is installed inside the wind bucket 2, and the blade frame 2 is composed of a bracket and a blade shaft, an extended bottom rod is fixedly installed at the bottom end of the blade shaft, and the bottom of the extended bottom rod is fixedly provided with evenly distributed bristles.

[0016] Preferably, a liquid pump is fixedly installed on the base, the input end of the liquid pump is fixedly connected to the bottom end of the liquid receiving bucket, a liquid delivery pipe is fixedly connected between the output end of the liquid pump and the distillation tank, a support bracket is fixedly installed between the branch pipe, wind bucket 1, liquid receiving bucket and the liquid delivery pipe, and the bottom end of the support bracket is fixedly connected to the base.

[0017] Preferably, the top of the distillation tank is fixedly connected to a condensing cylinder, and one end of the distillation tank close to the heating sleeve is provided with a spiral wall sheet with an integral structure, and a plurality of extension sheets with an integral structure are provided on the spiral wall sheet.

[0018] Preferably, a column is fixedly installed at the center of the bottom end of the drying plate, and the bottom end of the column is rotatably connected to the base, a worm gear is fixedly installed on the outer peripheral wall of one end of the column, a driving motor is fixedly installed on the top of the base, and a worm is fixedly installed on the output shaft of the driving motor, and the worm and the worm gear are meshed with each other.

[0019] The present invention provides a purification process for propyl acetate by improving the process, which has the following improvements and advantages compared with the prior art:

[0020] First, when the present invention is used, the liquid supply pipe drips the product into one of the drying bins, and uses the dry particles in the drying bin to absorb most of the water in the product; when the dry particles in the drying bin are saturated with water, the drying plate can be rotated, at this time, the arc surface convex block can abut against the arc head block, and push the rack to move upward, at this time, through the transmission action of the driven gear, the extension shaft and the flap are driven to flip, so as to seal the extension end ring, and when the other drying bin is aligned with the liquid supply pipe, the rack is reset under the action of the reset spring 2, so that the flap is flipped again and drip irrigation is carried out again; the above-mentioned saturated drying bin will move between the wind bucket 1 and the wind bucket 2, and use the wind bucket 1 and the wind bucket 2 to blow out hot air to dry the dry particles, so that the dry particles in the purification process can be recycled, reducing the use cost;

[0021] Secondly, when the drying plate rotates, the mesh plate can be pressed against the arc block until the center of the mesh plate is aligned with the arc block. On the other hand, when hot air is introduced into the first wind bucket, the first fan blade frame and the arc block can be rotated through the action of the first fan blade frame. When the arc block is aligned with the slot, the first return spring can be used to insert the arc block into the slot. At this time, the first fan blade frame can drive the mesh plate to rotate, which is beneficial to improve the uniformity of drying the dried particles. On the other hand, under the action of the booster air pump, a part of the hot air can be pressurized and blown into the second wind bucket, thereby further increasing the drying area of ​​the dried particles and ensuring the drying efficiency of the dried particles.

[0022] In summary, the present invention can significantly reduce the operating cost of the drying process, especially for industrial applications that require a large amount of drying; at the same time, through the hot air effect of wind scoops 1 and 2, the dry particles can be fully dried to ensure that their water absorption performance is restored, thereby achieving recycling. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a schematic diagram of the overall first-view stereoscopic structure of the present invention;

[0025] Figure 2 It is a schematic diagram of the overall second viewing angle stereoscopic structure of the present invention;

[0026] Figure 3 It is a schematic diagram of the main structure of the present invention;

[0027] Figure 4 It is a schematic diagram of the cutaway structure of the distillation tank and the drying plate of the present invention;

[0028] Figure 5 For the present invention Figure 4 The enlarged structural diagram at A in the middle;

[0029] Figure 6 It is a schematic diagram of the internal structure of the wind scoop 1 and the wind scoop 2 of the present invention;

[0030] Figure 7 For the present invention Figure 6 The enlarged structural diagram at B in the middle;

[0031] Figure 8This is a schematic diagram of the cross-sectional structure of the arc head round block of the present invention;

[0032] Fig. 9 It is a schematic diagram of the cross-sectional structure of the extended end ring of the present invention.

[0033] Reference numerals:

[0034] 1. Base; 2. Distillation tank; 201. Heating sleeve; 202. Spiral heating wire; 203. Bracket; 204. Air pipe; 205. Branch pipe; 206. Booster pump; 207. Spiral wall sheet; 208. Extension sheet; 3. Drying plate; 301. Drying chamber; 302. Mesh plate; 303. Arc bump; 304. Slot; 4. Liquid supply pipe; 401. Extension end ring; 5. Condenser cylinder; 6. Driving motor; 601. Worm; 602. Worm wheel; 603. Column; 7. Liquid pump; 701 , liquid delivery pipe; 8, fan; 801, air supply pipe; 9, wind bucket one; 901, wind bucket two; 902, annular rod; 903, annular groove plate; 904, fan blade frame one; 905, arc head round block; 906, storage chamber; 907, reset spring one; 908, arc head block; 10, fan blade frame two; 11, extension bottom rod; 12, bristles; 13, support bracket; 14, liquid receiving bucket; 15, flap; 16, extension shaft; 17, driven gear; 18, rack; 19, reset spring two; 20, arc head block. DETAILED DESCRIPTION

[0035] The present invention is described in detail below, and the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] The present invention provides a purification process of propyl acetate by improvement. The technical scheme of the present invention is:

[0037] like Figures 1 to 9 As shown, the embodiment of the present invention provides a purification process of propyl acetate, and the purification process specifically includes the following steps:

[0038] Step 1: adding the product of the esterification reaction of acetic acid and propanol to a purification device, and using the purification device to first dry the product to remove most of the water therein;

[0039] Step 2: the dried product enters a purification device for distillation, wherein propyl acetate evaporates before water, thereby achieving separation of the water liquid;

[0040] Step 3: After the propyl acetate in the product forms steam, it is condensed using a purification device to finally purify the propyl acetate;

[0041] The purification equipment in steps 1 to 3 includes a base 1, a distillation tank 2 and a drying plate 3 are arranged above the base 1, a plurality of drying chambers 301 are opened on the drying plate 3 and are equidistantly distributed, and a mesh plate 302 is rotatably installed on the inner bottom of each drying chamber 301, and dry particles are placed in the drying chamber 301, and an air bucket 2 901 and an air bucket 1 9 are respectively arranged at the upper and lower ends of one side of the drying plate 3, and a liquid receiving bucket 14 is arranged at the bottom of the other side of the drying plate 3, and the tops of the air bucket 1 9 and the liquid receiving bucket 14 are both in contact with the bottom of the drying plate 3, and a coaxially arranged liquid supply pipe 4 is arranged above the liquid receiving bucket 14, and one end of the liquid supply pipe 4 is fixedly connected to an external product supply system, and the liquid supply pipe 4 An extension end ring 401 is fixedly provided at the end thereof, and an extension shaft 16 is rotatably installed on one side of the extension end ring 401, one end of the extension shaft 16 is fixedly connected to a flap 15, and the other end of the extension shaft 16 is fixedly installed with a driven gear 17, the extension end ring 401 is provided with a cavity one and a cavity two, and a rack 18 meshing with the driven gear 17 is slidably installed in cavity one and cavity two, an arc head block 20 is fixedly installed at the bottom end of the rack 18, and a reset spring 2 19 is fixedly connected between one side of the arc head block 20 and cavity two, and a plurality of arc surface protrusions 303 staggered with the drying bin 301 are fixedly provided on the top of the drying plate 3, and the arc surface protrusions 303 are used to conflict with the arc head block 20.

[0042] Through the above structure, in actual operation, the liquid supply pipe 4 drips the product into one of the drying bins 301, and uses the dry particles in the drying bin 301 to absorb most of the water in the product; when the dry particles in the drying bin 301 are saturated with water, the drying plate 3 can be rotated, and at this time, the arc surface convex block 303 can abut against the arc head block 20 and push the rack 18 to move upward. At this time, through the transmission action of the driven gear 17, the extension shaft 16 and the flap 15 are driven to flip, so as to block the extension end ring 401, and when the other drying bin 301 is aligned with the liquid supply pipe 4, the rack 18 is reset under the action of the reset spring 19, so that the flap 15 is flipped again and drip irrigation is resumed;

[0043] The water-saturated drying bin 301 will move between wind scoop 1 9 and wind scoop 2 901, and use wind scoop 1 9 and wind scoop 2 901 to blow out hot air to dry the dry particles, so that the dry particles in the purification process can be recycled to reduce the cost of use.

[0044] Furthermore, a heating sleeve 201 is fixedly installed on the outer peripheral wall of the bottom of the distillation tank 2, and a spiral heating wire 202 is fixedly installed on the heating sleeve 201, and a bracket 203 is fixedly installed between the heating sleeve 201 and the base 1; through the above structure, the spiral heating wire 202 can be used in conjunction with the heating sleeve 201 to achieve heating of the distillation tank 2, and distillation and purification of the product.

[0045] As a further solution of the present invention, an air supply pipe 204 is fixedly connected between one side of the heating sleeve 201 and the wind bucket 1 9, a branch pipe 205 is fixedly connected between one side of the air supply pipe 204 and the wind bucket 2 901, a booster air pump 206 is fixedly installed on the branch pipe 205, a fan 8 is fixedly installed on the top outer wall of the base 1, and an air supply pipe 801 is fixedly connected between the output end of the fan 8 and the heating sleeve 201.

[0046] Through the above structure, when the fan 8 is controlled to start, the heat in the heating sleeve 201 can be passed through the air supply pipe 801 and the air delivery pipe 204 into the air bucket 9, thereby achieving drying of the dry particles.

[0047] Furthermore, an annular rod 902 is fixedly installed on the inner wall of one end of the wind bucket 9, and an annular groove plate 903 is slidably sleeved on the annular rod 902, a blade frame 904 is fixedly installed on the inner wall of the annular groove plate 903, and an arc head block 905 is fixedly installed on the top of the blade frame 904, a storage cavity 906 is opened on the arc head block 905, and an arc head block 908 is slidably installed inside the storage cavity 906, and a pair of return springs 907 are fixedly installed between the bottom of the arc head block 908 and the bottom of the storage cavity 906.

[0048] Furthermore, a slot 304 matching the arc head block 908 is formed at the bottom of the mesh plate 302 .

[0049] Through the above structure, when the drying disc 3 rotates, the mesh plate 302 can be against the arc block 908 until the center of the mesh plate 302 is aligned with the arc block 908. On the other hand, when hot air is introduced into the wind bucket 1 9, the fan blade frame 1 904 and the arc block 905 can be rotated through the action of the fan blade frame 1 904. When the arc block 908 is aligned with the slot 304, the arc block 908 can be inserted into the slot 304 under the action of the reset spring 1 907. At this time, the fan blade frame 1 904 can drive the mesh plate 302 to rotate, which is beneficial to improve the uniformity of the drying of the dried particles. On the other hand, under the action of the booster air pump 206, a part of the hot air can be pressurized and blown into the wind bucket 2 901, thereby further increasing the drying area for the dried particles and ensuring the drying efficiency of the dried particles.

[0050] Furthermore, a blade frame 10 is installed inside the wind bucket 2 901, and the blade frame 10 is composed of a bracket and a blade shaft, an extension bottom rod 11 is fixedly installed at the bottom end of the blade shaft, and the bottom of the extension bottom rod 11 is fixedly provided with evenly distributed bristles 12; through the above structure, when hot air passes through the wind bucket 2 901, it can drive the blade shaft and the extension bottom rod 11 to rotate, and cooperate with the bristles 12 to realize the stirring of the dry particles in the drying bin 301, thereby achieving the purpose of further improving the drying effect.

[0051] As a further solution of the present invention, a liquid pump 7 is fixedly installed on the base 1, the input end of the liquid pump 7 is fixedly connected to the bottom end of the liquid receiving bucket 14, a liquid delivery pipe 701 is fixedly connected between the output end of the liquid pump 7 and the distillation tank 2, a support bracket 13 is fixedly installed between the branch pipe 205, the wind bucket 9, the liquid receiving bucket 14 and the liquid delivery pipe 701, and the bottom end of the support bracket 13 is fixedly connected to the base 1.

[0052] Through the above structure, when the liquid pump 7 is in operation, the product in the liquid receiving bucket 14 can be sent to the distillation tank 2 through the liquid sending pipe 701.

[0053] Furthermore, the top of the distillation tank 2 is fixedly connected to the condensation cylinder 5, and an end of the distillation tank 2 close to the heating sleeve 201 is provided with an integral spiral wall piece 207, and the spiral wall piece 207 is provided with a plurality of integral extension pieces 208; through the above structure, the heat exchange area of ​​the distillation tank 2 can be effectively increased by means of the spiral wall pieces 207 and the extension pieces 208, thereby ensuring the heating effect of the distillation tank 2.

[0054] Furthermore, a column 603 is fixedly installed at the center of the bottom end of the drying plate 3, and the bottom end of the column 603 is rotatably connected to the base 1, a worm gear 602 is fixedly installed on the outer peripheral wall of one end of the column 603, and a driving motor 6 is fixedly installed on the top of the base 1, and a worm 601 is fixedly installed on the output shaft of the driving motor 6, and the worm 601 and the worm gear 602 are meshed with each other; through the above structure, when the driving motor 6 is controlled to start, the transmission action of the worm 601 and the worm gear 602 drives the column 603 to rotate, thereby realizing the rotation of the drying plate 3.

[0055] The specific working method is as follows: in actual operation, the liquid supply pipe 4 drips the product into one of the drying chambers 301, and uses the dry particles in the drying chamber 301 to absorb most of the water in the product; when the dry particles in the drying chamber 301 are saturated with water, the drive motor 6 is controlled to start, and the column 603 is driven to rotate through the transmission action of the worm 601 and the worm wheel 602, so as to realize the rotation of the drying plate 3. The drying plate 3 can be rotated, and at this time, the arc surface convex block 303 can be connected with the arc head block 20 is against each other and pushes the rack 18 to move upward. At this time, through the transmission effect of the driven gear 17, the extension shaft 16 and the flap 15 are driven to flip, so as to block the extension end ring 401. When the other drying chamber 301 is aligned with the liquid supply pipe 4, the rack 18 is reset under the action of the reset spring 2 19, so that the flap 15 is flipped again and drip irrigation is resumed. The above-mentioned saturated drying chamber 301 will move between the wind bucket 1 9 and the wind bucket 2 901, and use The wind bucket 1 9 and the wind bucket 2 901 blow out hot air to dry the dried particles, so that the dried particles in the purification process can be recycled and used, reducing the use cost; when the drying plate 3 rotates, the mesh plate 302 can abut against the arc head block 908 until the center of the mesh plate 302 is aligned with the arc head block 908. On the other hand, when hot air is introduced into the wind bucket 1 9, it can be acted on by the fan blade frame 1 904 to make the fan blade frame 1 904 and the arc head round block 905 rotate, and when the arc head block When the block 908 is aligned with the slot 304, under the action of the reset spring 907, the arc head block 908 can be inserted into the slot 304. At this time, the fan blade frame 904 can drive the mesh plate 302 to rotate, which is beneficial to improve the uniformity of the drying of the dried particles; on the other hand, under the action of the booster air pump 206, a part of the hot air can be pressurized and blown into the wind bucket 2 901, thereby further increasing the drying area of ​​the dried particles and ensuring the drying efficiency of the dried particles;

[0056] When the hot air passes through the second wind bucket 901, it can drive the fan shaft and the extension bottom rod 11 to rotate, and cooperate with the bristles 12 to move the dry particles in the drying chamber 301, thereby achieving the purpose of further improving the drying effect;

[0057] When the liquid pump 7 is in operation, the product in the liquid receiving hopper 14 can be sent into the distillation tank 2 through the liquid delivery pipe 701. By means of the spiral wall pieces 207 and the extension pieces 208, the heat exchange area of ​​the distillation tank 2 can be effectively increased, thereby ensuring the heating effect of the distillation tank 2 and distilling and purifying the product.

[0058] The above description enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A purification process for propyl acetate, characterized in that: The purification process specifically comprises the following steps: Step 1: adding the product of the esterification reaction of acetic acid and propanol to a purification device, and using the purification device to first dry the product to remove most of the water therein; Step 2: the dried product enters a purification device for distillation, wherein propyl acetate evaporates before water, thereby achieving separation of the water liquid; Step 3: After the propyl acetate in the product forms steam, it is condensed using a purification device to finally purify the propyl acetate; The purification equipment in steps 1 to 3 comprises a base (1), a distillation tank (2) and a drying plate (3) are arranged above the base (1), a plurality of drying chambers (301) equidistantly distributed are provided on the drying plate (3), and a mesh plate (302) is rotatably installed on the inner bottom of each drying chamber (301), dry particles are placed in the drying chamber (301), an air scoop 2 (901) and an air scoop 1 (9) are arranged at the upper and lower ends of one side of the drying plate (3), a liquid receiving hopper (14) is arranged at the bottom of the other side of the drying plate (3), and the tops of the air scoop 1 (9) and the liquid receiving hopper (14) are both in contact with the bottom of the drying plate (3), a coaxially arranged liquid supply pipe (4) is arranged above the liquid receiving hopper (14), one end of the liquid supply pipe (4) is fixedly connected to an external product supply system, and the liquid supply pipe (4) is connected to the product supply system. An extension end ring (401) is fixedly provided at the end of the tube (4), and an extension shaft (16) is rotatably installed on one side of the extension end ring (401), one end of the extension shaft (16) is fixedly connected to a flap (15), and the other end of the extension shaft (16) is fixedly installed with a driven gear (17), the extension end ring (401) is provided with a cavity 1 and a cavity 2, and a rack (18) meshing with the driven gear (17) is slidably installed in the cavity 1 and the cavity 2 together, an arc head block (20) is fixedly installed at the bottom end of the rack (18), and a return spring 2 (19) is fixedly connected between one side of the arc head block (20) and the cavity 2, and a plurality of arc surface protrusions (303) staggeredly distributed with the drying bin (301) are fixedly provided on the top of the drying plate (3), and the arc surface protrusions (303) are used to conflict with the arc head block (20).

2. A process for purifying propyl acetate according to claim 1, characterized in that: A heating sleeve (201) is fixedly mounted on the outer peripheral wall of the bottom of the distillation tank (2), and a spiral heating wire (202) is fixedly mounted on the heating sleeve (201), and a bracket (203) is fixedly mounted between the heating sleeve (201) and the base (1).

3. A process for purifying propyl acetate according to claim 2, characterized in that: An air supply pipe (204) is fixedly connected between one side of the heating sleeve (201) and wind scoop one (9), a branch pipe (205) is fixedly connected between one side of the air supply pipe (204) and wind scoop two (901), a booster air pump (206) is fixedly mounted on the branch pipe (205), a fan (8) is fixedly mounted on the top outer wall of the base (1), and an air supply pipe (801) is fixedly connected between the output end of the fan (8) and the heating sleeve (201).

4. A process for purifying propyl acetate according to claim 3, characterized in that: An annular rod (902) is fixedly mounted on the inner wall of one end of the wind bucket (9), and an annular groove plate (903) is slidably sleeved on the annular rod (902), a blade frame (904) is fixedly mounted on the inner wall of the annular groove plate (903), and an arc head round block (905) is fixedly mounted on the top of the blade frame (904), a storage cavity (906) is opened on the arc head round block (905), and an arc head clamping block (908) is slidably mounted inside the storage cavity (906), and a pair of return springs (907) are fixedly mounted between the bottom of the arc head clamping block (908) and the bottom of the storage cavity (906).

5. A process for purifying propyl acetate according to claim 4, characterized in that: The bottom of the mesh plate (302) is provided with a slot (304) matching the arc head block (908).

6. A process for purifying propyl acetate according to claim 5, characterized in that: A blade frame 2 (10) is installed inside the wind scoop 2 (901), and the blade frame 2 (10) is composed of a bracket and a blade shaft. An extended bottom rod (11) is fixedly installed at the bottom end of the blade shaft, and evenly distributed bristles (12) are fixedly provided at the bottom of the extended bottom rod (11).

7. A process for purifying propyl acetate according to claim 6, characterized in that: A liquid pump (7) is fixedly mounted on the base (1); the input end of the liquid pump (7) is fixedly connected to the bottom end of the liquid receiving bucket (14); a liquid delivery pipe (701) is fixedly connected between the output end of the liquid pump (7) and the distillation tank (2); a support bracket (13) is fixedly mounted between the branch pipe (205), the wind bucket (9), the liquid receiving bucket (14) and the liquid delivery pipe (701); and the bottom end of the support bracket (13) is fixedly connected to the base (1).

8. A process for purifying propyl acetate according to claim 2, characterized in that: The top of the distillation tank (2) is fixedly connected to a condensation cylinder (5), and one end of the distillation tank (2) close to the heating sleeve (201) is provided with an integral spiral wall sheet (207), and the spiral wall sheet (207) is provided with a plurality of integral extension sheets (208).

9. A process for purifying propyl acetate according to claim 2, characterized in that: A column (603) is fixedly mounted at the center of the bottom end of the drying plate (3), and the bottom end of the column (603) is rotatably connected to the base (1). A worm gear (602) is fixedly mounted on the outer peripheral wall of one end of the column (603). A driving motor (6) is fixedly mounted on the top of the base (1), and a worm (601) is fixedly mounted on the output shaft of the driving motor (6), and the worm gear (601) and the worm gear (602) are meshed with each other.

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