Product separation device for producing pyromellitic dianhydride by using durene

Abstract

The invention discloses a product separation device for producing pyromellitic dianhydride by durene, and relates to the technical field of chemical synthesis, the product separation device comprises a reaction cylinder, an upper cover and a bottom support, the reaction cylinder is connected with a gas supply assembly, the bottom support is connected with an opening and closing mechanism, a heating crucible is placed in the bottom support, and the heating crucible is connected with the gas supply assembly; a discharging connector is formed in the side wall of the reaction cylinder, a separating mechanism is connected to the discharging connector, and a feeding assembly is arranged on the edge of the reaction cylinder; the bottom support is driven to be opened or closed through the opening and closing mechanism, raw materials are conveyed into the heating crucible in the bottom support through the feeding assembly, air is continuously fed into the reaction cylinder through the air feeding assembly in the reaction process, a product pyromellitic dianhydride is obtained after air oxidation, generated gaseous pyromellitic dianhydride is subjected to desublimation through the separation mechanism, and solid pyromellitic dianhydride is obtained. Through the structure, the pyromellitic dianhydride synthesis and separation efficiency is effectively improved, and the possible leakage problem of gaseous pyromellitic dianhydride in the separation process is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of chemical synthesis, and specifically to a product separation device for producing phthalic anhydride using durene. Background Art

[0002] Phthalic anhydride is an important chemical raw material with extremely wide applications. The high molecular polymer polyimide synthesized from phthalic anhydride and aromatic diamine is a new synthetic material that is heat-resistant, resistant to deep cold, impact-resistant, and has excellent electrical and mechanical properties. There are many production methods for phthalic anhydride, and the current mainstream method is to use durene as the raw material and obtain phthalic anhydride by the air oxidation method. Durene and air generate gaseous phthalic anhydride products under the conditions of heating and a catalyst, and finally, the gaseous phthalic anhydride is cooled to obtain solid phthalic anhydride attached inside the condenser.

[0003] In the existing phthalic anhydride production equipment, after cooling the gaseous phthalic anhydride, the separation efficiency of the solid phthalic anhydride attached inside the condensation equipment is low, and the gaseous phthalic anhydride that is not completely sublimated during separation is prone to leakage problems. Summary of the Invention

[0004] The purpose of the present invention is to provide a product separation device for producing phthalic anhydride using durene to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solutions: A product separation device for producing phthalic anhydride using durene, including a reaction cylinder, an upper cover and a bottom support movably installed at the upper and lower ends of the reaction cylinder, the reaction cylinder is connected with a gas supply component, the bottom support is connected with an opening and closing mechanism, a lifting and abutting component is arranged at the bottom of the bottom support, a heating crucible is placed inside the bottom support, the heating crucible is connected with the gas supply component, a discharge interface is arranged on the side wall of the reaction cylinder, a separation mechanism is connected to the discharge interface, and a feeding component is arranged at the edge of the reaction cylinder.

[0006] The separation mechanism includes a separation cylinder, fixing plates II are uniformly arranged inside the separation cylinder, condensers are uniformly connected to the bottoms of the fixing plates II, a scraping frame is sleeved outside the condensers, the scraping frame is connected with a lifting cylinder II, air guiding strips are arranged above the fixing plates II, the air guiding strips are communicated with the condensers, an annular dispersion frame is arranged on the inner wall of the separation cylinder, the annular dispersion frame is communicated with the air guiding strips, a condenser is connected to the top of the separation cylinder, the condenser is communicated with the annular dispersion frame, a receiving funnel and an aggregation hopper are arranged at the bottom of the separation cylinder, a circulation purification pipe is arranged between the bottom of the aggregation hopper and the feeding component, and a return air pipe is arranged between the separation cylinder and the reaction cylinder.

[0007] As a further aspect of the present invention: The air supply assembly includes an intake pipe, which passes through the upper cover and is vertically arranged at the central part of the reaction cylinder. The part of the intake pipe inside the reaction cylinder is evenly distributed with branch pipes, and the branch pipes are annularly distributed.

[0008] As a further aspect of the present invention: The bottom of the heating crucible is provided with support columns, and the heating crucible is fixedly installed between the support columns and the bottom support. A heating wire mesh is arranged between the heating crucible and the bottom support. The upper port of the heating crucible is evenly provided with air guide holes, and the inside of the heating crucible is evenly provided with air outlet holes. The air outlet holes are connected to the air guide holes, and the air outlet holes are inclined. The bottom of the intake pipe is evenly provided with connecting pipes, and the ends of the connecting pipes are connected with an annular fastening frame, and the annular fastening frame cooperates with the upper port of the heating crucible.

[0009] As a further aspect of the present invention: The center of the heating crucible is provided with an intermediate column. The top of the intermediate column is circumferentially distributed with extension rods. The top of the intermediate column is provided with a plug-in rod. The circumferential direction of the plug-in rod is evenly provided with rotating rods, and the ends of the rotating rods are provided with baffles, and the baffles are located at the parts facing the air outlet holes.

[0010] As a further aspect of the present invention: The opening and closing mechanism includes a first fixing plate arranged on the outer wall of the reaction cylinder. A driving motor is arranged on the first fixing plate, and the driving motor is connected with a threaded rod. The bottom of the first fixing plate is provided with a guide rod, and a lifting plate is slidably installed on the guide rod. The lifting plate is threadedly connected with the threaded rod. The end of the lifting plate is rotatably installed with a connecting plate, and the connecting plate is fixedly connected with the side wall of the bottom support. The bottom of the lifting plate is fixedly connected with a push-pull motor, and the push-pull motor is connected with a connecting frame. The bottom of the connecting plate is provided with a clamping guide rail, and the end of the connecting frame is provided with a sliding rod, and the sliding rod is slidably installed with the connecting frame.

[0011] As a further aspect of the present invention: The lifting and abutting assembly includes a first lifting cylinder arranged at the bottom of the reaction cylinder. A first rotating rod and a second rotating rod are respectively rotatably installed on both sides of the first lifting cylinder. The first rotating rod and the second rotating rod form a rhombus structure. The end of the second rotating rod is rotatably connected with a rotating connection block, and the first lifting cylinder is connected with the rotating connection block. The outer ring of the rotating connection block is provided with an annular bracket.

[0012] As a further aspect of the present invention: The feeding assembly includes a feeding cylinder arranged on the side of the separation cylinder. Mesitylene in powder state is placed in the feeding cylinder. The bottom of the feeding cylinder is connected with a telescopic pipe, and the end of the telescopic pipe is provided with a feeding nozzle. The bottom of the feeding cylinder is provided with a telescopic motor, and the end of the telescopic motor is connected with the feeding nozzle.

[0013] As a further solution of the present invention: the bottom of the separation cylinder is annularly distributed with the same fixed plate 2, the bottom of the condenser tube is connected to the fixed plate 2, the fixed plate 2 located at the bottom is provided with the same air guide strip, the bottom of the condenser tube is connected to the air guide strip, the bottom of the separation cylinder is provided with an annular collecting frame, the air guide strip located at the bottom is connected to the annular collecting frame, the annular collecting frame is provided with an air outlet pipe, and the air outlet pipe extends to the outside of the separation cylinder.

[0014] As a further solution of the present invention: the inner circle of the receiving funnel is evenly provided with strip-shaped protrusions, a crushing roller is installed in the receiving funnel, a mounting frame is provided on the circulating purification pipe, a rotating motor is fixedly installed on the mounting frame, the rotating motor is connected to the crushing roller, a two-way air pump is provided on the circulating purification pipe, and a discharge pipe is provided at a position of the circulating purification pipe close to the gathering bucket.

[0015] Compared with the prior art, the present invention has the following beneficial effects: (1) Low-temperature gas is fed into the condenser tube through the condenser. When the high-temperature gaseous anhydride fed into the separation tube contacts the low-temperature condenser tube, the gaseous anhydride condenses on the outer wall of the condenser tube. The lifting cylinder drives the scraper frame to move up and down, so that the anhydride condensed and attached to the outer wall of the condenser tube is separated and received by the receiving funnel and the gathering bucket at the bottom. The outer ring of the scraper frame is installed in cooperation with the inner wall of the separation tube, so that the anhydride condensed and attached to the inner wall of the separation tube can also be separated under the drive of the scraper frame. The circulating purification pipe re-feeds the collected anhydride into the feeding assembly, and after high-temperature gasification, it is re-sent to the separation mechanism for low-temperature condensation, thereby purifying the product anhydride. The return gas pipe is set to return the excess anhydride to the reaction tube, so that the gaseous anhydride product in the reaction tube can be circulated and sent to the separation mechanism for condensation and separation, thereby improving the separation efficiency.

[0016] (2) The heating crucible is continuously heated by the heating wire mesh, so that the durene in the heating crucible is liquefied and then vaporized. In order to increase the vaporization rate, the air supply component is combined with the connecting pipe and the annular buckle frame to send air into the air guide hole and the air outlet hole on the heating crucible. After the air is sent out through the air outlet, a vortex is formed in the heating crucible, generating bubbles, thereby increasing the vaporization rate of the liquid durene. At the same time, the vortex is used to drive the baffle and the rotating rod to rotate, and the rotating rod and the extension rod move alternately, so that the bubbles burst after reaching the extension rod, and the bubbles are prevented from continuously accumulating and rising.

[0017] (3) Install the driving motor and the threaded rod through the first fixing plate to drive the lifting plate, the connecting plate, and the bottom support as a whole to move up and down. Combine the pushing and pulling motor and the connecting frame to drive the connecting plate to rotate, so as to control the bottom support to tilt towards the feeding component, facilitating the feeding component to send the raw materials into the heating crucible in the bottom support. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a front structural schematic diagram of the present invention.

[0019] Figure 2 It is a back structural schematic diagram of the present invention.

[0020] Figure 3 It is a sectional structural schematic diagram of the reaction cylinder in the present invention.

[0021] Figure 4 It is an internal structural schematic diagram of the bottom support in the present invention.

[0022] Figure 5 It is a structural schematic diagram of the opening and closing mechanism in the present invention.

[0023] Figure 6 It is an installation schematic diagram of the heating crucible in the present invention.

[0024] Figure 7 It is an internal structural schematic diagram of the heating crucible in the present invention.

[0025] Figure 8 It is a structural schematic diagram of the lifting and abutting component in the present invention.

[0026] Figure 9 It is a structural schematic diagram of the air supply component in the present invention.

[0027] Figure 10 It is an installation schematic diagram of the separation mechanism in the present invention.

[0028] Figure 11 It is an internal structural schematic diagram of the separation cylinder in the present invention.

[0029] Figure 12 It is an installation schematic diagram of the crushing roller in the present invention.

[0030] In the figure: 1, reaction cylinder; 10, upper cover; 100, discharge interface; 11, bottom support; 12, heating crucible; 120, heating wire mesh; 121, support column; 123, air guide hole; 124, air outlet hole; 125, extension rod; 126, rotating rod; 127, baffle; 128, insertion rod; 129, middle column; 130, intake pipe; 131, branch pipe; 132, connecting pipe; 133, annular fastening frame; 2, opening and closing mechanism; 20, first fixing plate; 21, driving motor; 22, guide rod; 23, lifting plate; 24, connecting plate; 25, clamping guide rail; 26, pushing and pulling motor; 27, connecting frame; 28, sliding rod; 29, threaded rod; 3, lifting and abutting component; 30, first lifting cylinder; 31, first rotating rod; 32, second rotating rod; 33, rotating connection block; 34, annular bracket; 4, feeding component; 40, feeding cylinder; 41, telescopic motor; 42, telescopic pipe; 43, feeding nozzle; 5, separation mechanism; 50, separation cylinder; 51, condenser; 52, second lifting cylinder; 53, second fixing plate; 54, condensing pipe; 55, annular dispersion frame; 56, air guide strip; 57, scraping frame; 58, air outlet pipe; 59, annular collection frame; 510, receiving funnel; 511, strip-shaped protrusion; 512, crushing roller; 513, gathering hopper; 514, rotating motor; 515, discharge pipe; 60, two-way air pump; 61, mounting frame; 6, circulating purification pipe; 7, return air pipe. Detailed implementation mode

[0031] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0032] In addition, the terms "one" and "two" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "one" and "two" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more, unless otherwise specifically defined.

[0033] In the present invention, unless otherwise clearly specified and defined, terms such as "installation", "connection", "linkage", "fixation" and the like shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] The technical solutions of the present invention will be further described in detail below in conjunction with specific embodiments.

[0035] As Figure 1 , Figure 2 , Figure 4 shown, a product separation device for producing phthalic anhydride from mesitylene includes a reaction cylinder 1, an upper cover 10 and a bottom support 11 movably installed at the upper and lower ends of the reaction cylinder 1. The reaction cylinder 1 is connected with a gas supply assembly, the bottom support 11 is connected with an opening and closing mechanism 2, a lifting and abutting assembly 3 is arranged at the bottom of the bottom support 11, a heating crucible 12 is placed in the bottom support 11, the heating crucible 12 is connected with the gas supply assembly, a discharge interface 100 is arranged on the side wall of the reaction cylinder 1, a separation mechanism 5 is connected to the discharge interface 100, and a feeding assembly 4 is arranged at the edge of the reaction cylinder 1.

[0036] As Figure 10 , Figure 11 shown, the separation mechanism 5 includes a separation cylinder 50. Fixing plates II 53 are evenly arranged in the separation cylinder 50. Condensing tubes 54 are evenly connected to the bottoms of the fixing plates II 53. A scraping frame 57 is sleeved outside the condensing tubes 54. The scraping frame 57 is connected with a lifting cylinder II 52. Air guiding strips 56 are arranged above the fixing plates II 53. The air guiding strips 56 are communicated with the condensing tubes 54. An annular dispersion frame 55 is arranged on the inner wall of the separation cylinder 50. The annular dispersion frame 55 is communicated with the air guiding strips 56. A condenser 51 is connected to the top of the separation cylinder 50. The condenser 51 is communicated with the annular dispersion frame 55. A receiving funnel 510 and an aggregation hopper 513 are arranged at the bottom of the separation cylinder 50. A circulation and purification pipe 6 is arranged between the bottom of the aggregation hopper 513 and the feeding assembly 4. A return air pipe 7 is arranged between the separation cylinder 50 and the reaction cylinder 1.

[0037] Specifically, the feeding component 4 feeds mesitylene into the heating crucible 12 inside the bottom tray 11 and heats it to about 350 - 400 degrees Celsius. At this temperature, mesitylene gradually turns into gas and fills the inside of the reaction cylinder 1. At this time, the air supply component continuously supplies air into the reaction cylinder 1. A composite catalyst vanadium pentoxide - titanium dioxide is placed in the reaction cylinder 1 in advance, and the mass ratio of the catalyst to mesitylene is about 1:10 - 1:5. During the reaction process, the methyl groups in the mesitylene molecules are gradually oxidized, and a series of complex oxidation reactions occur, ultimately converting into gaseous phthalic anhydride. The gaseous phthalic anhydride is sent into the separation mechanism 5 through the discharge interface 100 and obtains solid phthalic anhydride after cooling and sublimation.

[0038] More specifically, low - temperature gas is sent into the condenser tube 54 through the condenser 51. When the high - temperature gaseous phthalic anhydride sent into the separation cylinder 50 contacts the low - temperature condenser tube 54, the gaseous phthalic anhydride sublimes on the outer wall of the condenser tube 54. The lifting cylinder two 52 drives the scraping frame 57 to move up and down, so that the phthalic anhydride sublimated and attached to the outer wall of the condenser tube 54 is separated and received by the receiving funnel 510 and the aggregating hopper 513 at the bottom. The outer ring of the scraping frame 57 is fitted with the inner wall of the separation cylinder 50, so that the phthalic anhydride sublimated and attached to the inner wall of the separation cylinder 50 can also be separated under the drive of the scraping frame 57.

[0039] The circulating purification pipe 6 sends the collected phthalic anhydride back into the feeding component 4. After high - temperature gasification, it is sent back to the separation mechanism 5 for low - temperature sublimation again, so as to purify the product phthalic anhydride. The return air pipe 7 is provided to send the excessive phthalic anhydride back into the reaction cylinder 1, so that the gaseous phthalic anhydride product in the reaction cylinder 1 can be circulated to the separation mechanism 5 for sublimation separation, improving the separation efficiency.

[0040] Further, as Figure 9 shown, the air supply component includes an inlet pipe 130. The inlet pipe 130 passes through the upper cover 10 and is vertically arranged at the central part of the reaction cylinder 1. The part of the inlet pipe 130 inside the reaction cylinder 1 is evenly distributed with branch pipes 131, and the branch pipes 131 are distributed in a ring shape.

[0041] Specifically, the branch pipes 131 are evenly distributed inside the reaction cylinder 1, fully dispersing the air into the reaction cylinder 1 and accelerating the reaction process.

[0042] Further, as Figure 6 、 Figure 7 、 Figure 9As shown, a support column 121 is provided at the bottom of the heating crucible 12, and the heating crucible 12 is fixedly installed between the support column 121 and the bottom bracket 11. A heating wire mesh 120 is provided between the heating crucible 12 and the bottom bracket 11, and the upper port of the heating crucible 12 is evenly provided with air guide holes 123, and the interior of the heating crucible 12 is evenly provided with air outlet holes 124, and the air outlet holes 124 are connected to the air guide holes 123, and the air outlet holes 124 are inclined. The bottom of the air inlet pipe 130 is evenly provided with connecting pipes 132, and the end of the connecting pipe 132 is connected to an annular buckle frame 133, and the annular buckle frame 133 cooperates with the upper port of the heating crucible 12.

[0043] Further, such as Figure 7 As shown, an intermediate column 129 is provided at the center of the heating crucible 12, and extension rods 125 are circumferentially distributed on the top of the intermediate column 129. A plug-in rod 128 is provided on the top of the intermediate column 129, and rotating rods 126 are evenly distributed on the circumference of the plug-in rod 128. A baffle 127 is provided at the end of the rotating rod 126, and the baffle 127 is directly opposite to the position of the air outlet 124.

[0044] Specifically, the heating crucible 12 is continuously heated by the heating wire mesh 120, so that the durene in the heating crucible 12 is liquefied and then vaporized. In order to increase the vaporization rate, the air supply component combines the connecting pipe 132 and the annular buckle frame 133 to send air into the air guide hole 123 and the air outlet 124 on the heating crucible 12. After the air is sent out through the air outlet 124, a vortex is formed in the heating crucible 12, generating bubbles, and increasing the vaporization rate of the liquid durene. At the same time, the vortex is used to drive the baffle 127 and the rotating rod 126 to rotate, and the rotating rod 126 and the extension rod 125 move alternately, so that the bubbles burst after reaching the extension rod 125, and the bubbles are prevented from continuously accumulating and rising.

[0045] Further, such as Figure 3 , Figure 4 , Figure 5 As shown, the opening and closing mechanism 2 includes a fixed plate 20 arranged on the outer wall of the reaction tube 1, and a driving motor 21 is arranged on the fixed plate 20, and the driving motor 21 is connected to a threaded rod 29. A guide rod 22 is arranged at the bottom of the fixed plate 20, and a lifting plate 23 is slidably installed on the guide rod 22. The lifting plate 23 is threadedly connected to the threaded rod 29, and a connecting plate 24 is rotatably installed at the end of the lifting plate 23. The connecting plate 24 is fixedly connected to the side wall of the base 11, and a push-pull motor 26 is fixedly connected to the bottom of the lifting plate 23. The push-pull motor 26 is connected to a connecting frame 27, and a clamping guide rail 25 is arranged at the bottom of the connecting plate 24. A sliding rod 28 is arranged at the end of the connecting frame 27, and the sliding rod 28 is slidably installed with the connecting frame 27.

[0046] Specifically, in order to facilitate the feeding component 4 to feed materials into the bottom tray 11, a driving motor 21 and a threaded rod 29 are installed through the first fixing plate 20 to drive the lifting plate 23, the connecting plate 24, and the bottom tray 11 as a whole to perform lifting movements. In combination with the pushing and pulling motor 26 and the connecting frame 27, the connecting plate 24 is driven to rotate, thereby controlling the bottom tray 11 to tilt towards the feeding component 4, facilitating the feeding component 4 to feed raw materials into the heating crucible 12 in the bottom tray 11.

[0047] Furthermore, as Figure 8 shown, the lifting and abutting component 3 includes a first lifting cylinder 30 arranged at the bottom of the reaction cylinder 1. A first rotating rod 31 and a second rotating rod 32 are respectively rotatably installed on both sides of the first lifting cylinder 30. The first rotating rod 31 and the second rotating rod 32 form a rhombus structure. The end of the second rotating rod 32 is rotatably connected to the rotating connection block 33. The first lifting cylinder 30 is connected to the rotating connection block 33. An annular bracket 34 is arranged on the outer ring of the rotating connection block 33.

[0048] Specifically, after the bottom tray 11 and the reaction cylinder 1 are matched, pressure needs to be applied to the reaction cylinder 1 during the reaction process. By arranging the lifting and abutting component 3 at the bottom of the bottom tray 11 and controlling the rotating connection block 33 to rise in combination with the first lifting cylinder 30, the annular bracket 34 is made to lift under the bottom tray 11, thereby achieving the lifting and reliable sealing between the bottom tray 11 and the reaction cylinder 1.

[0049] Furthermore, as Figure 2 shown, the feeding component 4 includes a feeding cylinder 40 arranged on the side of the separation cylinder 50. The feeding cylinder 40 contains mesitylene in powder form. A telescopic tube 42 is connected to the bottom of the feeding cylinder 40. A feeding nozzle 43 is arranged at the end of the telescopic tube 42. A telescopic motor 41 is arranged at the bottom of the feeding cylinder 40. The end of the telescopic motor 41 is connected to the feeding nozzle 43.

[0050] Specifically, the telescopic motor 41 drives the feeding nozzle 43 at the end to move, thereby entering or leaving the bottom tray 11 to achieve raw material transportation and stop feeding.

[0051] Furthermore, as Figure 11 shown, the same second fixing plates 53 are annularly distributed at the bottom of the separation cylinder 50. The bottom of the condensing tube 54 is connected to the second fixing plates 53. The same air guiding strips 56 are arranged on the second fixing plates 53 at the bottom. The bottom of the condensing tube 54 is communicated with the air guiding strips 56. An annular collecting rack 59 is arranged at the bottom of the separation cylinder 50. The air guiding strips 56 at the bottom are communicated with the annular collecting rack 59. An air outlet pipe 58 is arranged on the annular collecting rack 59. The air outlet pipe 58 extends to the outside of the separation cylinder 50.

[0052] Specifically, the low-temperature gas is evenly dispersed into the condensation tube 54 through the annular dispersion frame 55 and the air guide strip 56, and then leaves the separation cylinder 50 through the air guide strip 56 at the bottom, the annular collection frame 59, and the air outlet pipe 58. During the sublimation process of gaseous phthalic anhydride, it will not contact the outside air, avoiding the introduction of new impurities.

[0053] Further, as Figure 12 shown, strip-shaped protrusions 511 are evenly arranged on the inner ring of the receiving funnel 510. A crushing roller 512 is fitted and installed in the receiving funnel 510. An installation frame 61 is provided on the circulating purification pipe 6. A rotating motor 514 is fixedly installed on the installation frame 61. The rotating motor 514 is connected to the crushing roller 512. A two-way air pump 60 is provided on the circulating purification pipe 6. A discharge pipe 515 is communicated with the part of the circulating purification pipe 6 close to the collecting hopper 513.

[0054] Specifically, after the phthalic anhydride scraped by the scraping frame 57 falls into the receiving funnel 510, the rotating motor 514 drives the crushing roller 512 to rotate. After the solid phthalic anhydride is crushed between the crushing roller 512 and the receiving funnel 510, it is gathered by the collecting hopper 513. When the solid phthalic anhydride needs to be purified, the solid phthalic anhydride is sent back to the feeding assembly 4 through the circulating purification pipe 6, sent into the reaction cylinder 1 to be reheated and vaporized, and then sent back to the separation mechanism 5 for sublimation purification. The purified solid phthalic anhydride is sent into the discharge pipe 515 by combining with the two-way air pump 60, so as to obtain the final product phthalic anhydride.

[0055] The working principle of the embodiment of the present invention is: As Figures 1 - 12As shown, the feeding assembly 4 feeds durene into the heating crucible 12 in the bottom support 11, and heats it to about 350-400 degrees Celsius. During the reaction process, the methyl groups in the durene molecules are gradually oxidized and finally converted into gaseous product anhydrides. The gaseous anhydrides are fed into the separation mechanism 5 through the discharge interface 100, and are cooled and condensed to obtain solid anhydrides. Low-temperature gas is fed into the condenser 54 through the condenser 51. When the high-temperature gaseous anhydrides fed into the separation cylinder 50 contact the low-temperature condenser 54, the gaseous anhydrides condense on the outer wall of the condenser 54, and the lifting cylinder 2 52 drives the scraper frame 57 to move up and down, so that the anhydrides condensed and attached to the outer wall of the condenser 54 are separated and received by the receiving funnel 510 and the gathering bucket 513 at the bottom. The outer ring of the scraper frame 57 is installed in a matching manner with the inner wall of the separation cylinder 50, so that the anhydrides condensed and attached to the inner wall of the separation cylinder 50 can also be separated under the drive of the scraper frame 57. The circulating purification pipe 6 sends the collected anhydride back to the feeding assembly 4, and after high-temperature gasification, it is sent back to the separation mechanism 5 for low-temperature condensation, thereby purifying the product anhydride. The return air pipe 7 is set to send the excess anhydride back to the reaction tube 1, so that the gaseous anhydride product in the reaction tube 1 can be circulated to the separation mechanism 5 for condensation and separation, thereby improving the separation efficiency. The heating crucible 12 is continuously heated by the heating wire mesh 120, so that the tetramethylbenzene in the heating crucible 12 is liquefied and then vaporized. In order to increase the vaporization rate, the air supply assembly is combined with the connecting pipe 132 and the annular buckle frame 133 to send air into the air guide hole 123 and the air outlet 124 on the heating crucible 12. After the air is sent out through the air outlet 124, a vortex is formed in the heating crucible 12, generating bubbles, thereby increasing the vaporization rate of the liquid tetramethylbenzene. At the same time, the eddy current is used to drive the baffle 127 and the rotating rod 126 to rotate, and the rotating rod 126 and the extension rod 125 move alternately, so that the bubbles burst after reaching the extension rod 125, and the bubbles are prevented from rising after continuous accumulation. In order to facilitate the feeding component 4 to feed the material into the bottom bracket 11, the driving motor 21 and the threaded rod 29 are installed through the fixed plate 120 to drive the lifting plate 23 and the connecting plate 24, and the bottom bracket 11 to perform lifting and lowering movements as a whole. Combined with the push-pull motor 26 and the connecting frame 27 to drive the connecting plate 24 to rotate, the bottom bracket 11 is controlled to tilt toward the direction of the feeding component 4, so that the feeding component 4 can feed the raw materials into the heating crucible 12 in the bottom bracket 11. After the homogenized anhydride scraped by the scraping frame 57 falls into the receiving funnel 510, the crushing roller 512 is driven to rotate by the rotating motor 514. After the solid homogenized anhydride is crushed between the crushing roller 512 and the receiving funnel 510, it is gathered by the gathering bucket 513. When the solid anhydride needs to be purified, the solid anhydride is sent back to the feeding assembly 4 in combination with the circulation purification pipe 6, sent to the reaction cylinder 1 for reheating and gasification, and then sent back to the separation mechanism 5 for desublimation purification. The purified solid anhydride is sent to the discharge pipe 515 in combination with the bidirectional air pump 60, thereby obtaining the final product anhydride.

[0056] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention. Any reference signs in the claims shall not be construed as limiting the claims involved.

[0057] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A product separation device for producing phthalic anhydride using durene, comprising a reaction cylinder (1), and an upper cover (10) and a bottom support (11) movably installed at the upper and lower ends of the reaction cylinder (1), characterized in that, The reaction cylinder (1) is connected with an air supply assembly, the bottom support (11) is connected with an opening and closing mechanism (2), a lifting and abutting assembly (3) is arranged at the bottom of the bottom support (11), a heating crucible (12) is placed in the bottom support (11), the heating crucible (12) is connected with the air supply assembly, a discharge interface (100) is arranged on the side wall of the reaction cylinder (1), a separation mechanism (5) is connected to the discharge interface (100), and a feeding assembly (4) is arranged at the edge of the reaction cylinder (1); The separation mechanism (5) comprises a separation cylinder (50), fixing plates II (53) are evenly arranged in the separation cylinder (50), condensing tubes (54) are evenly connected to the bottoms of the fixing plates II (53), a scraping frame (57) is sleeved outside the condensing tubes (54), the scraping frame (57) is connected with a lifting cylinder II (52), air guiding strips (56) are arranged above the fixing plates II (53), the air guiding strips (56) are communicated with the condensing tubes (54), an annular dispersion frame (55) is arranged on the inner wall of the separation cylinder (50), the annular dispersion frame (55) is communicated with the air guiding strips (56), a condenser (51) is connected to the top of the separation cylinder (50), the condenser (51) is communicated with the annular dispersion frame (55), a receiving funnel (510) and an aggregating hopper (513) are arranged at the bottom of the separation cylinder (50), a circulation purification pipe (6) is arranged between the bottom of the aggregating hopper (513) and the feeding assembly (4), and a return air pipe (7) is arranged between the separation cylinder (50) and the reaction cylinder (1).

2. The product separation device for producing phthalic anhydride using mesitylene according to claim 1, characterized in that, The air supply assembly comprises an air inlet pipe (130), the air inlet pipe (130) passes through the upper cover (10) and is vertically arranged at the central part of the reaction cylinder (1), branch pipes (131) are evenly distributed at the part of the air inlet pipe (130) inside the reaction cylinder (1), and the branch pipes (131) are annularly distributed.

3. The product separation device for producing phthalic anhydride using 1,2,4,5-tetramethylbenzene according to claim 2, characterized in that, Support columns (121) are arranged at the bottom of the heating crucible (12), the heating crucible (12) is fixedly installed with the bottom support (11) through the support columns (121), a heating wire mesh (120) is arranged between the heating crucible (12) and the bottom support (11), air guiding holes (123) are evenly arranged at the upper port of the heating crucible (12), air outlet holes (124) are evenly arranged inside the heating crucible (12), the air outlet holes (124) are connected with the air guiding holes (123), the air outlet holes (124) are obliquely arranged, connecting pipes (132) are evenly arranged at the bottom of the air inlet pipe (130), the ends of the connecting pipes (132) are connected with an annular fastening frame (133), and the annular fastening frame (133) is matched with the upper port of the heating crucible (12).

4. The product separation device for producing phthalic anhydride using mesitylene according to claim 3, characterized in that, A middle column (129) is provided at the center of the heating crucible (12). Extension rods (125) are circumferentially distributed at the top of the middle column (129). A plug rod (128) is provided at the top of the middle column (129). Rotating rods (126) are evenly arranged circumferentially on the plug rod (128). A baffle (127) is provided at the end of the rotating rod (126). The baffle (127) faces the position of the air outlet hole (124).

5. A product separation device for producing phthalic anhydride using 1,2,4,5-tetramethylbenzene according to claim 1, characterized in that, The opening and closing mechanism (2) includes a first fixing plate (20) provided on the outer wall of the reaction cylinder (1). A driving motor (21) is provided on the first fixing plate (20). The driving motor (21) is connected to a threaded rod (29). A guide rod (22) is provided at the bottom of the first fixing plate (20). A lifting plate (23) is slidably mounted on the guide rod (22). The lifting plate (23) is threadedly connected to the threaded rod (29). A connecting plate (24) is rotatably mounted at the end of the lifting plate (23). The connecting plate (24) is fixedly connected to the side wall of the bottom support (11). A push-pull motor (26) is fixedly connected to the bottom of the lifting plate (23). The push-pull motor (26) is connected to a connecting frame (27). A clamping guide rail (25) is provided at the bottom of the connecting plate (24). A sliding rod (28) is provided at the end of the connecting frame (27). The sliding rod (28) is slidably mounted on the connecting frame (27).

6. The product separation device for producing phthalic anhydride using 1,2,4,5-tetramethylbenzene according to claim 5, wherein, The lifting and abutting component (3) includes a first lifting cylinder (30) provided at the bottom of the reaction cylinder (1). A first rotating rod (31) and a second rotating rod (32) are respectively rotatably mounted on both sides of the first lifting cylinder (30). The first rotating rod (31) and the second rotating rod (32) form a rhombus structure. The end of the second rotating rod (32) is rotatably connected to a rotating connection block (33). The first lifting cylinder (30) is connected to the rotating connection block (33). An annular bracket (34) is provided on the outer ring of the rotating connection block (33).

7. The product separation device for producing phthalic anhydride from mesitylene according to claim 6, characterized in that, The feeding component (4) includes a feeding cylinder (40) provided on the side of the separation cylinder (50). Mesitylene in powder state is placed in the feeding cylinder (40). A telescopic tube (42) is connected to the bottom of the feeding cylinder (40). A feeding nozzle (43) is provided at the end of the telescopic tube (42). A telescopic motor (41) is provided at the bottom of the feeding cylinder (40). The end of the telescopic motor (41) is connected to the feeding nozzle (43).

8. A product separation device for producing phthalic anhydride using 1,2,4,5-tetramethylbenzene according to claim 1, characterized in that, The bottom of the separation cylinder (50) is annularly distributed with identical fixing plates II (53). The bottom of the condensing pipe (54) is connected to the fixing plate II (53). Identical air guiding strips (56) are arranged on the bottom fixing plate II (53). The bottom of the condensing pipe (54) is communicated with the air guiding strip (56). The bottom of the separation cylinder (50) is provided with an annular collecting rack (59). The bottom air guiding strip (56) is communicated with the annular collecting rack (59). An air outlet pipe (58) is arranged on the annular collecting rack (59), and the air outlet pipe (58) extends to the outside of the separation cylinder (50).

9. The product separation device for producing phthalic anhydride using 1,2,4,5-tetramethylbenzene according to claim 8, characterized in that, Bar-shaped protrusions (511) are evenly arranged on the inner ring of the receiving funnel (510). A crushing roller (512) is fitted and installed in the receiving funnel (510). An installation frame (61) is arranged on the circulating purification pipe (6). A rotating motor (514) is fixedly installed on the installation frame (61). The rotating motor (514) is connected to the crushing roller (512). A two-way air pump (60) is arranged on the circulating purification pipe (6). A discharge pipe (515) is communicated with the part of the circulating purification pipe (6) close to the collecting hopper (513).

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