Polyester polycondensation reactor and production method

Abstract

The present application provides a polyester polycondensation reactor and a production method, which relates to the technical field of polyester production equipment; the polyester polycondensation reactor comprises: a shell, a feed pipe is arranged on the top of the shell, a discharge port is arranged on the bottom of the shell, and a vacuum tube is arranged on the shell; a material buffer mechanism is arranged in the shell, and the material buffer mechanism is used to slow down the speed of the material moving from the feed pipe to the discharge port; an anti-drop mechanism is arranged on the material buffer mechanism, and the anti-drop mechanism is used to prevent the material from falling when moving on the material buffer mechanism; a heating mechanism is arranged on the material buffer mechanism, and the heating mechanism is used to heat the material buffer mechanism. The polyester polycondensation reactor and the production method of the present application improve the production efficiency of polyester.

Description

Technical Field

[0001] The present application relates to the technical field of polyester production equipment, and in particular to a polyester polycondensation reactor and a production method. Background Art

[0002] Polyester polycondensation is a chemical reaction process for synthesizing polyester. Polyester is a class of polymer compounds connected by ester groups. Common polyesters include polyethylene terephthalate and polybutylene terephthalate. Polyester is widely used in plastic bottles, fibers, films and other fields. Polyester polycondensation reactors are required for the production of polyester.

[0003] The polyester polycondensation reactor of the related technology includes a shell and a stirring mechanism. The top of the shell is connected to the shell with a feed port, and the bottom of the shell is connected to the shell with a discharge port. The stirring mechanism is arranged in the shell. By placing the material in the shell along the feed port, the stirring mechanism can stir the material to achieve the production of polyester, and the produced polyester can be discharged along the discharge port.

[0004] However, when polyester needs to be produced in batches, it is necessary to wait for the previous batch of materials to be stirred and discharged from the discharge port before placing the next batch of materials in the shell for stirring, which reduces the production efficiency of polyester. Summary of the invention

[0005] The present application provides a polyester polycondensation reactor and a production method, which are used to solve the technical problem that the related technology needs to wait until the previous batch of materials is stirred before stirring the next batch of materials to produce polyester, thereby reducing the polyester production efficiency.

[0006] In one aspect, the present application provides a polyester polycondensation reactor, comprising:

[0007] A shell, wherein a feed pipe is arranged on the top of the shell, a discharge port is arranged on the bottom of the shell, and a vacuum pipe is arranged on the shell;

[0008] A material buffer mechanism, the material buffer mechanism is arranged in the housing, and the material buffer mechanism is used to slow down the speed at which the material moves from the feed pipe to the discharge port;

[0009] An anti-drop mechanism, the anti-drop mechanism is arranged on the material buffer mechanism, and the anti-drop mechanism is used to prevent the material from falling when moving on the material buffer mechanism;

[0010] A heating mechanism is arranged on the material buffer mechanism, and is used to heat the material buffer mechanism.

[0011] In some embodiments, the material buffer mechanism includes a material guide and a plurality of first buffer trays, the material guide is arranged in the shell, the plurality of first buffer trays are distributed along the height direction of the shell, the first buffer tray is provided with a plurality of first material passing holes, and the material guide is used to guide the material entering through the feed pipe to the first buffer tray.

[0012] In some embodiments, the material buffer mechanism further includes a plurality of second buffer trays, each of which is disposed between adjacent first buffer trays, and each of which is provided with a plurality of second material passing holes.

[0013] In some embodiments, the diameter of the first buffer tray gradually increases from one side of the feed pipe toward one side of the discharge port, and the diameter of the second buffer tray gradually decreases from one side of the feed pipe toward one side of the discharge port.

[0014] In some embodiments, an upper edge of the second buffer tray is connected to a bottom edge of the upper first buffer tray, and a lower edge of the second buffer tray is connected to a top edge of the lower first buffer tray.

[0015] In some embodiments, the anti-drop mechanism includes an anti-drop plate, and the anti-drop plate is set on the top edge of the first buffer tray and the top edge of the second buffer tray. A blocking space is formed between the anti-drop plate and the first buffer tray and the second buffer tray, and the blocking space is used to prevent the material from falling along the edges of the first buffer tray and the second buffer tray.

[0016] In some embodiments, the material guide includes a guide cylinder, one end of which is configured as a closed end facing the feed pipe, the other end of the guide cylinder is connected to the top edge of the first buffer tray, and the diameter of the guide cylinder gradually increases from one side of the feed pipe toward one side of the discharge port.

[0017] In some embodiments, the first buffer tray, the second buffer tray and the material guide are all hollow, the heating mechanism includes an oil inlet pipe, an oil outlet pipe and a plurality of oil pipes, one end of the plurality of oil pipes is connected to the oil inlet pipe, and the other end is connected to the oil outlet pipe, the plurality of oil pipes are passed through the shell, and the plurality of oil pipes are respectively connected to the hollow plurality of the first buffer trays, the hollow plurality of the second buffer trays and the hollow material guide.

[0018] In some embodiments, a preheater is further included, and the preheater is disposed on the feed pipe, and the preheater is used to preheat the material entering the feed pipe.

[0019] On the other hand, the present application provides a polyester polycondensation reaction production method, using the polyester polycondensation reactor, the polyester polycondensation reaction production method comprising:

[0020] The pressure inside the shell is adjusted to a preset pressure through the vacuum pipe;

[0021] adjusting the temperature inside the housing to a preset temperature by the heating mechanism;

[0022] The material is continuously transported into the shell along the feed pipe, and the material is reacted within a preset reaction time through the material buffer mechanism to generate a target product which is continuously discharged from the discharge port.

[0023] The present application provides a polyester polycondensation reactor and a production method. The polyester polycondensation reactor provided by the present application, by conveying materials into a shell along a feed pipe, slowing down the speed of the materials moving along the feed pipe to a discharge port through a material buffer mechanism, so that the materials react fully to generate polyester during the movement, thereby realizing continuous conveying and continuous production of polyester, and improving the production efficiency of polyester; by adopting the arrangement of a vacuum tube, the pressure inside the shell can be adjusted through the vacuum tube, so that the reaction rate of the materials under a specified pressure can be further increased, thereby further improving the production efficiency of polyester; by adopting the arrangement of a heating mechanism, the temperature inside the shell can be adjusted, so that the reaction rate of the materials under a specified temperature can be further increased, thereby further improving the production efficiency of polyester; by adopting the arrangement of an anti-drop mechanism, the materials can be prevented from directly falling to the position where the discharge port is when moving on the material buffer mechanism, so that the materials react further fully, thereby making the materials react completely, indirectly improving the quality of the produced polyester, and further improving the production efficiency of polyester; by arranging the feed pipe and the discharge port at the top and bottom of the shell respectively, the materials can move in the vertical direction, and the space occupied by the shell in the horizontal direction is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0025] Figure 1 A schematic diagram of a half-section structure of a polyester polycondensation reactor provided in an embodiment of the present application;

[0026] Figure 2 for Figure 1 A schematic diagram of the structure of the middle material guide and the first buffer tray;

[0027] Figure 3 for Figure 1 A schematic diagram of the structure of the second buffer tray from a top view;

[0028] Figure 4 for Figure 1 A schematic diagram of the structure of the first buffer tray and the second buffer tray;

[0029] Figure 5 A schematic flow chart of the polyester polycondensation reaction production method provided in the embodiments of the present application.

[0030] Description of reference numerals:

[0031] 100, shell; 110, feed pipe; 120, discharge port; 130, vacuum tube; 140, jacket; 150, liquid inlet pipe; 160, liquid outlet pipe;

[0032] 200, material buffer mechanism; 210, material guide; 211, guide cylinder; 212, closed end; 220, first buffer tray; 221, first material passing hole; 230, second buffer tray; 231, second material passing hole;

[0033] 300, anti-drop mechanism; 310, anti-drop plate; 320, blocking space;

[0034] 400, heating mechanism; 410, oil inlet pipe; 420, oil outlet pipe; 430, oil delivery pipe;

[0035] 500, preheater; 510, heat transfer oil inlet pipe; 520, heat transfer oil outlet pipe.

[0036] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0037] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0038] As described in the background technology, the polyester polycondensation reactor of the related technology includes a shell and a stirring mechanism. The top of the shell is connected to the shell with a feed port, and the bottom of the shell is connected to the shell with a discharge port. The stirring mechanism is arranged in the shell. By placing the material in the shell along the feed port, the stirring mechanism can stir the material to achieve the production of polyester, and the produced polyester can be discharged along the discharge port.

[0039] However, when polyester needs to be produced in batches, it is necessary to wait for the previous batch of materials to be stirred and discharged from the discharge port before placing the next batch of materials in the shell for stirring, which reduces the production efficiency of polyester.

[0040] In response to the above technical problems, an embodiment of the present application provides a polyester polycondensation reactor and a production method, wherein the pressure inside the shell is adjusted by a vacuum tube, and the heat-conducting oil is transported along an oil inlet pipe to multiple oil delivery pipes so that the heat-conducting oil heats multiple first buffer trays and multiple second buffer trays and is discharged along the oil outlet pipe, and the material is continuously transported into the feed pipe along the feed pipe so that the material falls on the closed end of the guide cylinder, and the material is guided along the guide cylinder in the circumference of the first buffer tray. As the diameter of the first buffer tray gradually increases, the material moves slowly on the first buffer tray, and when the material moves to the first feed hole, it can be divided along the first feed hole and fall on the next second buffer tray, and as the diameter of the second buffer tray gradually decreases, the material moves slowly on the second buffer tray, and when the material moves to the second feed hole, it can be divided again along the second feed hole and fall on the next first buffer tray, and the movement speed of the material is slowed down by multiple first buffer trays and multiple second buffer trays, and the material can fully react to generate polyester and be continuously discharged along the discharge port, and the uninterrupted production of polyester is achieved by continuously transporting the material, thereby improving the production efficiency of polyester.

[0041] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0042] like Figure 1 As shown, a polyester polycondensation reactor comprises:

[0043] The housing 100 has a feed pipe 110 disposed on the top of the housing 100, a discharge port 120 disposed on the bottom of the housing 100, and a vacuum pipe 130 disposed on the housing 100;

[0044] A material buffer mechanism 200, which is disposed in the housing 100 and is used to slow down the speed at which the material moves from the feed pipe 110 to the discharge port 120;

[0045] An anti-drop mechanism 300, which is disposed on the material buffer mechanism 200, and is used to prevent the material from falling when moving on the material buffer mechanism 200;

[0046] The heating mechanism 400 is disposed on the material buffer mechanism 200 , and is used to heat the material buffer mechanism 200 .

[0047] In the present embodiment, the shell 100 is configured as a shell 100 with a jacket 140, and a liquid inlet pipe 150 and a liquid outlet pipe 160 are connected to the shell 100 and connected to the jacket 140 of the shell 100. The heat transfer oil is transported into the jacket 140 of the shell 100 along the liquid inlet pipe 150 and discharged along the liquid outlet pipe 160 of the shell 100, thereby heating the shell 100, improving the thermal insulation effect of the shell 100 and preventing heat loss; the cross-section of the shell 100 is circular, the feed pipe 110 is arranged at the top of the shell 100 and located at the center of the circular shell 100, and the discharge port 120 is arranged at the bottom of the shell 100 and located at the center of the circular shell 100; the vacuum pipe 130 is arranged on the top wall of the shell 100; in other embodiments, the shape of the shell 100 can be adaptively adjusted as needed; the positions of the feed pipe 110, the discharge port 120 and the vacuum pipe 130 can also be adaptively adjusted as needed; in the present embodiment, the polyester polycondensation reactor can also be produced for other products.

[0048] By adopting the above technical solution, the material is transported into the shell 100 along the feed pipe 110, and the material buffer mechanism 200 slows down the speed of the material moving along the feed pipe 110 to the discharge port 120, so that the material is fully reacted to generate polyester during the movement, thereby realizing continuous transportation and continuous production of polyester, and improving the production efficiency of polyester; by adopting the setting of the vacuum tube 130, the pressure inside the shell 100 can be adjusted by the vacuum tube 130, so that the reaction rate of the material under the specified pressure is further increased, thereby further improving the production efficiency of polyester; by adopting the setting of the heating mechanism 400, the shell 100 can be adjusted. 00, so that the reaction rate of the material at the specified temperature is further improved, thereby further improving the polyester production efficiency; by adopting the setting of the anti-drop mechanism 300, it is possible to prevent the material from directly falling to the position of the discharge port 120 when moving on the material buffer mechanism 200, so that the material can further react fully, thereby making the material react completely, indirectly improving the quality of the produced polyester, and further improving the polyester production efficiency; by arranging the feed pipe 110 and the discharge port 120 at the top and bottom of the shell 100 respectively, the material can move in the vertical direction, reducing the space occupied by the shell 100 in the horizontal direction.

[0049] Combination Figure 1 and Figure 2The material buffer mechanism 200 includes a material guide 210 and a plurality of first buffer trays 220. The material guide 210 is arranged in the shell 100. The plurality of first buffer trays 220 are distributed along the height direction of the shell 100. The first buffer tray 220 is provided with a plurality of first material passing holes 221. The material guide 210 is used to guide the material entering from the feed pipe 110 to the first buffer tray 220.

[0050] There are n first buffer trays 220, where 5≤n≤20. In the present embodiment, there are seven first buffer trays 220, which are evenly distributed along the height direction of the shell 100. The first feeding holes 221 are set as first waist-shaped holes, and the length direction of the first waist-shaped holes is set along the axis direction perpendicular to the first buffer tray 220. The widths of the multiple first waist-shaped holes are equal, and the lengths of the multiple first waist-shaped holes in the same circumferential direction of the first buffer tray 220 are equal. The lengths of the multiple first waist-shaped holes in the height direction of the first buffer tray 220 gradually decrease from one side of the feed pipe 110 toward one side of the discharge port 120; the length of the first waist-shaped hole is L1, and L1 satisfies the following formula:

[0051]

[0052] Wherein, R is the diameter of the first buffer tray 220 in the horizontal direction, the length of L1 is 10 mm-30 mm, and the width of the first waist-shaped hole is 2 mm to 5 mm.

[0053] By adopting the above technical scheme, when the material enters the feed pipe 110, the material can be guided to the first buffer tray 220 through the material guide 210, and the material is blocked by the first buffer tray 220, thereby slowing down the movement speed of the material. When the material moves to the position of the first feed hole 221, the material can fall through the first feed hole 221 to the first buffer tray 220 below and slow down the movement speed again, so that the material can further react completely; by adopting the setting of the first feed hole 221, the material can be cut when passing through, so that the cut material can further react completely; by adopting the setting structure of the first buffer tray 220 and the first feed hole 221, the structure is simple, which is convenient for the production and processing of the entire polyester condensation reactor.

[0054] Combination Figures 1 to 3 The material buffer mechanism 200 further includes a plurality of second buffer trays 230 , each of which is provided between adjacent first buffer trays 220 , and a plurality of second material passing holes 231 are provided on the second buffer trays 230 .

[0055] In this embodiment, six second buffer trays 230 are provided, and the six second buffer trays 230 are respectively located between adjacent first buffer trays 220. The second feeding hole 231 is set as a second waist-shaped hole. The length direction of the second waist-shaped hole is set along the axial direction perpendicular to the second buffer tray 230. The widths of the plurality of second waist-shaped holes are equal. The lengths of the plurality of second waist-shaped holes in the same circumferential direction of the second buffer tray 230 are equal. The lengths of the plurality of second waist-shaped holes in the height direction of the second buffer tray 230 gradually decrease from one side of the feed pipe 110 toward one side of the discharge port 120. The length of the second waist-shaped hole is L2, and L2 satisfies the following formula:

[0056]

[0057] In this embodiment, the length of L2 is 10mm-30mm, and the width of the second waist-shaped hole is 2mm to 5mm; the second buffer tray 230 and the first buffer tray 220 are symmetrically arranged along the cross-section of the shell 100; the number of the first buffer tray 220 and the second buffer tray 230 can be determined according to the reaction time of the material moving from the feed pipe 110 to the discharge port 120.

[0058] By adopting the above technical solution and setting a plurality of second buffer trays 230, when the material passes through the first feed hole 221 on the first buffer tray 220, it can fall on the second buffer tray 230, thereby further slowing down the material rate. The material passes through the second feed hole 231 on the second buffer tray 230 and falls on the first buffer tray 220 again, thereby allowing the material to further react completely, and the material can be further divided, thereby further allowing the material to react completely. The simple structure of the second buffer tray 230 and the second feed hole 231 facilitates the production and processing of the entire polyester polycondensation reactor.

[0059] Combination Figures 1 to 3 The diameter of the first buffer tray 220 gradually increases from one side of the feed pipe 110 toward one side of the discharge port 120 , and the diameter of the second buffer tray 230 gradually decreases from one side of the feed pipe 110 toward one side of the discharge port 120 .

[0060] In this embodiment, the first buffer tray 220 and the second buffer tray 230 are both configured as cones with two ends penetrated, and the cone-shaped first buffer tray 220 and the cone-shaped second buffer tray 230 are oriented in opposite directions.

[0061] By adopting the above technical solution, the diameter of the first buffer tray 220 is gradually increased, so that the material can slowly move downward along the inclined first buffer tray 220, thereby preventing the material from stagnation on the first buffer tray 220 and being unable to move; the diameter of the second buffer tray 230 is gradually reduced, so that the material can slowly move downward along the inclined second buffer tray 230, thereby preventing the material from stagnation on the second buffer tray 230 and being unable to move; and the material moves back and forth on the first buffer tray 220 and the second buffer tray 230, which can increase the moving distance of the material, thereby further allowing the material to react completely.

[0062] Combination Figures 1 to 3 The upper edge of the second buffer tray 230 is connected to the bottom edge of the upper first buffer tray 220 , and the lower edge of the second buffer tray 230 is connected to the top edge of the lower first buffer tray 220 .

[0063] By adopting the above technical solution, by connecting the adjacent first buffer trays 220 and the second buffer trays 230 to each other, the multiple first buffer trays 220 and the multiple second buffer trays 230 are formed into a whole, which indirectly improves the strength of the multiple first buffer trays 220 and the multiple second buffer trays 230, and the material can be directly moved to the second buffer tray 230 through the first buffer tray 220, preventing the material from falling from the first buffer tray 220 to the second buffer tray 230, further improving the material movement effect, slowing down the material movement speed, so that the material can further react completely.

[0064] Combination Figures 1 to 4 The anti-drop mechanism 300 includes an anti-drop plate 310. The top edge of the first buffer tray 220 and the top edge of the second buffer tray 230 are both provided with an anti-drop plate 310. A blocking space 320 is formed between the anti-drop plate 310 and the first buffer tray 220 and the second buffer tray 230. The blocking space 320 is used to prevent materials from falling along the edges of the first buffer tray 220 and the second buffer tray 230.

[0065] In this embodiment, the anti-drop plate 310 is arranged along the circumference of the first buffer tray 220 and the second buffer tray 230, and the extension direction of the anti-drop plate 310 is the same as that of the first buffer tray 220 and the second buffer tray 230. The diameter of the anti-drop plate 310 on the first buffer tray 220 gradually increases from the side of the feed pipe 110 toward the side of the discharge port 120, and the diameter of the anti-drop plate 310 on the second buffer tray 230 gradually decreases from the side of the feed pipe 110 toward the side of the discharge port 120. The anti-drop plate 310 is integrally arranged with the first buffer tray 220 and the second buffer tray 230, and is integrally arranged between the first buffer tray 220 and the second buffer tray 230; the anti-drop plate 310 is not arranged on the uppermost first buffer tray 220, and the first feeding hole 221 and the second feeding hole 231 are not arranged on the anti-drop plate 310.

[0066] By adopting the above-mentioned technical scheme and the setting of the anti-drop plate 310, when the material moves to the edge of the first buffer tray 220 and the second buffer tray 230, the material can be blocked by the anti-drop plate 310 on the first buffer tray 220 and the second buffer tray 230, thereby preventing the material from falling along the edge of the first buffer tray 220 and the second buffer tray 230, thereby preventing the material from directly falling from the first buffer tray 220 and the second buffer tray 230 to the discharge port 120, so that the material can be slowed down by the multiple first buffer trays 220 and the multiple second buffer trays 230, indirectly allowing the material to react completely; and the setting structure of the anti-drop plate 310 is simple, which is convenient for the production of the anti-drop plate 310, the multiple first buffer trays 220 and the multiple second buffer trays 230.

[0067] Combination Figure 1 and Figure 2 The material guide 210 includes a guide cylinder 211, one end of which is set as a closed end 212 set toward the feed pipe 110, and the other end of the guide cylinder 211 is connected to the top edge of the first buffer plate 220. The diameter of the guide cylinder 211 gradually increases from one side of the feed pipe 110 toward the side of the discharge port 120.

[0068] In this embodiment, the guide cylinder 211 is configured as a cone, and the recess of the conical guide cylinder 211 is configured to face away from the feed pipe 110. The first feed hole 221 and the second feed hole 231 are not configured on the conical guide cylinder 211. The obtuse angle formed between the two opposite sides of the guide cylinder 211 is 150°. The circumference of the guide cylinder 211 and the circumference of the uppermost first buffer tray 220 are located in the same plane, and the guide cylinder 211 and the first buffer tray 220 are configured as one piece.

[0069] By adopting the above technical solution, when the material enters the shell 100 along the feed pipe 110, the material falls on the closed end 212 of the feed pipe 110. Since the diameter of the guide cylinder 211 gradually increases, the guide cylinder 211 can evenly guide the material around the first buffer tray 220, thereby preventing the material from accumulating at a certain position on the first buffer tray 220 and becoming unable to move. By connecting the guide cylinder 211 to the first buffer tray 220, the transition effect between the guide cylinder 211 and the first buffer tray 220 is improved, preventing the material from falling between the guide cylinder 211 and the first buffer tray 220, and improving the effect of moving the material from the guide cylinder 211 to the first buffer tray 220 and the second buffer tray 230.

[0070] like Figure 1 As shown, the first buffer tray 220, the second buffer tray 230 and the material guide 210 are all hollow, and the heating mechanism 400 includes an oil inlet pipe 410, an oil outlet pipe 420 and a plurality of oil pipes 430, one end of the plurality of oil pipes 430 is connected to the oil inlet pipe 410, and the other end is connected to the oil outlet pipe 420, and the plurality of oil pipes 430 are passed through the shell 100, and the plurality of oil pipes 430 are respectively connected to the hollow plurality of first buffer trays 220, the hollow plurality of second buffer trays 230 and the hollow material guide 210.

[0071] In this embodiment, an oil delivery pipe 430 is connected to the guide cylinder 211, and the oil delivery pipe 430 on the guide cylinder 211 is passed through the side wall of the shell 100 and is located near the vacuum tube 130. Each first buffer tray 220 is connected to an oil delivery pipe 430, and multiple oil delivery pipes 430 of multiple first buffer trays 220 are interconnected outside the shell 100. Each second buffer tray 230 is connected to an oil delivery pipe 430, and multiple oil delivery pipes 430 of multiple second buffer trays 230 are interconnected. They are interconnected on the outside of the shell 100, and the oil pipe 430 of the second buffer tray 230 is connected to the oil pipe 430 of the guide cylinder 211, the oil inlet pipe 410 is located at the bottom of the side wall of the shell 100, and the oil inlet pipe 410 is connected to the oil pipe 430 of the first buffer tray 220, and the oil outlet pipe 420 is located at the top of the side wall of the shell 100, and the oil outlet pipe 420 is connected to the oil pipe 430 of the guide cylinder 211; multiple first buffer trays 220 and multiple second buffer trays 230 are fixed to the inside of the shell 100 through the oil pipe 430.

[0072] By adopting the above technical scheme, the heat transfer oil is transported to multiple oil pipes 430 through the oil inlet pipe 410, and the heat transfer oil can be transported to multiple hollow first buffer trays 220 and multiple hollow second buffer trays 230 through the multiple oil pipes 430, so that the heat transfer oil can heat the multiple first buffer trays 220 and the multiple second buffer trays 230, and the heat transfer oil will not affect the material in the shell 100. The heat transfer oil after heating the first buffer tray 220 and the second buffer tray 230 can be discharged along the oil outlet pipe 420, thereby improving the heating effect on the first buffer tray 220 and the second buffer tray 230, and indirectly improving the reaction efficiency of the material to generate polyester.

[0073] like Figure 1 As shown, the polyester polycondensation reactor further includes a preheater 500 , which is disposed on the feed pipe 110 . The preheater 500 is used to preheat the material entering the feed pipe 110 .

[0074] In this embodiment, the preheater 500 is configured as a shell-and-tube heater, which includes a heat transfer oil inlet pipe 510 and a heat transfer oil outlet pipe 520. Two heat transfer oil inlet pipes 510 are provided, and the two heat transfer oil inlet pipes 510 are located at the bottom of the feed pipe 110 and on both sides of the feed pipe 110. Two heat transfer oil outlet pipes 520 are provided, and the two heat transfer oil outlet pipes 520 are located at the top of the feed pipe 110 and on both sides of the feed pipe 110. The heat transfer oil is transported to the shell-and-tube heater through the heat transfer oil inlet pipe 510, so as to heat the feed pipe 110, thereby realizing the heating of the material passing through the feed pipe 110, and the heated heat transfer oil can be discharged along the heat transfer oil outlet pipe 520.

[0075] By adopting the above technical solution, the material entering the feed pipe 110 can be preheated by using the preheater 500, thereby further improving the reaction efficiency of the material to generate polyester.

[0076] A polyester polycondensation reaction production method, using the polyester polycondensation reactor of any of the above embodiments, the polyester polycondensation reaction production method comprises:

[0077] S101: adjusting the pressure inside the housing 100 to a preset pressure through the vacuum tube 130;

[0078] S102: adjusting the temperature inside the housing 100 to a preset temperature through the heating mechanism 400;

[0079] S103 : continuously conveying the material into the housing 100 along the feed pipe 110 , and allowing the material to react within a preset reaction time through the material buffer mechanism 200 to generate a target product and continuously discharge it from the discharge port 120 .

[0080] The specific structure of the polyester polycondensation reactor has been described in detail in the above embodiments and will not be repeated here.

[0081] In this embodiment, the preset pressure is set to 0 kPa to 100 kPa, the preset temperature is set to 140° C. to 280° C., and the preset reaction time is set to 1 h to 12 h.

[0082] The following is further described in detail with reference to specific embodiments:

[0083] The polyester polycondensation reactor of the above embodiment is used to polycondense the PBAT esterification liquid; PBAT (polybutylene terephthalate adipate) is a biodegradable polyester material, which is usually prepared by esterification and polycondensation of adipic acid (AA), terephthalic acid (PTA) and 1,4-butanediol (BDO).

[0084] Specifically include the following steps:

[0085] S101: adjusting the pressure inside the housing 100 to 1 Kpa (absolute pressure) through the vacuum pipe 130;

[0086] S102: by setting the temperature of the preheater 500 to 225° C., the guide cylinder 211 , the seven first buffer trays 220 , the six second buffer trays 230 and the housing 100 are heated to 220° C. by the heating mechanism 400 ;

[0087] S103: The temperature of the esterification liquid from the previous process is 180°C, and the flow rate is 100kg / h. After the esterification liquid passes through the preheater 500, the temperature is 220°C, and the polycondensation reaction begins;

[0088] S104: The diverted esterification liquid evenly falls onto the surface of the guide cylinder 211 and flows downward along the guide cylinder 211; after the material passes through the first material hole 221 of the first buffer tray 220, it evenly falls onto the surfaces of the first buffer tray 220 and the second buffer tray 230; this cycle repeats, and after 2 hours, the material finally falls to the bottom of the shell 100, and the material meets the performance requirements; subsequent materials continue to enter, and the reaction continues.

[0089] Among them, when the polycondensation reaction was carried out for 3h, 4h and 5h, the PBAT products were sampled, namely A1, A2 and A3; according to the method of S101-S104 of this embodiment, a continuous output of 100Kg / h can be achieved at a feed rate of 100Kg / h.

[0090] With the same feed amount, it takes 4 hours to produce PBAT using a kettle-type polyester polycondensation reactor of the related art, and it cannot be produced continuously but can only be produced in batches.

[0091] At the same feed rate, the PBAT products were sampled at 3h, 4h and 5h of the disc reactor, which were B1, B2 and B3 respectively. Although the disc reactor can produce continuously, it requires a motor to drive the disc to react, which increases the power consumption.

[0092] As shown in Table 1, when the reaction was carried out for 3h, 4h and 5h, the PBAT produced by the polyester polycondensation reactor and the disc reactor provided in the embodiment of the present application were A1, A2, A3 and B1, B2, B3, respectively, and the PBAT produced by the kettle polyester polycondensation reactor in the related art were C1, C2 and C3 in batches.

[0093] Table 1 is a performance comparison of PBAT (A1, A2, A3) produced by the polyester polycondensation reactor provided in the embodiment of the present application, PBAT (B1, B2, B3) produced by the disc reactor, and PBAT (C1, C2, C3) produced in three batches of kettle polyester polycondensation reactors at 3h, 4h and 5h.

[0094] Table 1

[0095]

[0096] It can be seen from Table 1 that the PBAT product produced by the polyester polycondensation reactor provided in the embodiment of the present application is superior to the PBAT products produced by the kettle polyester polycondensation reactor of the related art and the disc reactor of the related art in terms of molecular weight, melt index, acid value, A value and B value.

[0097] Molecular weight refers to the number of repeating units in a polymer molecule and is usually used to describe the size of a polymer. It is measured using a 1515-2414 gel permeation chromatograph (GPC), with chloroform as the mobile phase, an elution rate of 1 mL / min, a column temperature of 30°C, and polystyrene as the standard.

[0098] Melt index is the melt flow rate of a polymer through a standard die under a certain temperature and load. It is measured using an M12 series melt indexer in units of g / 10 minutes, at a temperature of 190°C and a load of 12.5 kg.

[0099] The acid value was determined by using a fully automatic acid value detector, model ST-1514; the mixed solvent was phenol-chloroform, with a volume ratio of 2:3. The standard titration solution was potassium hydroxide-benzyl alcohol, with a concentration of 0.01 mol / L, and the concentration of bromophenol blue indicator was 0.2%. Sample preparation: 0.5 g of sample was dissolved in 25.00 mL of phenol-chloroform mixed solvent.

[0100] Hue: The spherical particles of PBAT resin after granulation were dried at 80℃ for 4h, and directly tested with DC-P3 automatic colorimeter to determine its L value (brightness), a value (red-green hue) and b value (yellow-blue hue). Among them, the higher the L value, the greater the brightness; the higher the a value, the redder the polyester chips; the higher the b value, the yellower the polyester chips.

[0101] The pressure inside the shell 100 is adjusted by the vacuum pipe 130, and the heat transfer oil is transported along the oil inlet pipe 410 to the multiple oil delivery pipes 430, so that the heat transfer oil heats the multiple first buffer trays 220 and the multiple second buffer trays 230, and is discharged along the oil outlet pipe 420. The material is continuously transported into the feed pipe 110 along the feed pipe 110, and the material falls on the closed end 212 of the guide cylinder 211, and the material is guided along the guide cylinder 211 to the circumference of the first buffer tray 220. As the diameter of the first buffer tray 220 gradually increases, the material moves slowly on the first buffer tray 220. When the material moves to the first feed hole 221 When the material moves to the second feed hole 231, it can be divided along the second feed hole 231 and fall onto the next first buffer tray 220. The moving speed of the material is slowed down by the multiple first buffer trays 220 and the multiple second buffer trays 230. The material can fully react to generate polyester and be continuously discharged along the discharge port 120. The uninterrupted production of polyester is achieved by continuously conveying the material, thereby improving the production efficiency of polyester.

[0102] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0103] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A polyester polycondensation reactor, characterized in that: include: A shell (100), wherein a feed pipe (110) is disposed at the top of the shell (100), a discharge port (120) is disposed at the bottom of the shell (100), and a vacuum tube (130) is disposed on the shell (100); A material buffer mechanism (200), the material buffer mechanism (200) is arranged in the shell (100), the material buffer mechanism (200) is used to slow down the speed of the material moving from the feed pipe (110) to the discharge port (120), the material buffer mechanism (200) comprises a material guide (210), a plurality of first buffer trays (220) and a plurality of second buffer trays (230), the material guide (210) is used to guide the material entering the feed pipe (110) to the first buffer tray (220), and the first buffer tray (220) is provided with a plurality of first material passing holes (2 21), a plurality of second material passing holes (231) are provided on the second buffer tray (230), an upper edge of the second buffer tray (230) is connected to the bottom edge of the first buffer tray (220) at the upper part, a lower edge of the second buffer tray (230) is connected to the top edge of the first buffer tray (220) at the lower part, a diameter of the first buffer tray (220) gradually increases from one side of the feed pipe (110) toward one side of the discharge port (120), and a diameter of the second buffer tray (230) gradually decreases from one side of the feed pipe (110) toward one side of the discharge port (120); an anti-drop mechanism (300), the anti-drop mechanism (300) being arranged on the material buffer mechanism (200), the anti-drop mechanism (300) being used to prevent the material from falling when moving on the material buffer mechanism (200), the anti-drop mechanism (300) comprising an anti-drop plate (310), the top edge of the first buffer tray (220) and the top edge of the second buffer tray (230) being both provided with the anti-drop plate (310), the anti-drop plate (310) being arranged along the circumference of the first buffer tray (220) and the second buffer tray (230), and the anti-drop plate (310) extending in the same direction as the first buffer tray (220) and the second buffer tray (230); a heating mechanism (400), the heating mechanism (400) being arranged on the material buffer mechanism (200), the heating mechanism (400) being used to heat the material buffer mechanism (200); The first buffer tray (220), the second buffer tray (230) and the material guide (210) are all hollow. The heating mechanism (400) includes an oil inlet pipe (410), an oil outlet pipe (420) and a plurality of oil delivery pipes (430). One end of the plurality of oil delivery pipes (430) is connected to the oil inlet pipe (410), and the other end is connected to the oil outlet pipe (420). The plurality of oil delivery pipes (430) are passed through the shell (100), and the plurality of oil delivery pipes (430) are respectively connected to the hollow plurality of the first buffer trays (220), the hollow plurality of the second buffer trays (230) and the hollow material guide (210).

2. The polyester polycondensation reactor according to claim 1, characterized in that The material guide (210) is arranged in the shell (100), and a plurality of the first buffer trays (220) are distributed along the height direction of the shell (100).

3. The polyester polycondensation reactor according to claim 2, characterized in that: The second buffer tray (230) is arranged between adjacent first buffer trays (220).

4. The polyester polycondensation reactor according to claim 1, characterized in that A blocking space (320) is formed between the anti-drop plate (310) and the first buffer tray (220) and the second buffer tray (230), and the blocking space (320) is used to prevent the material from falling along the edges of the first buffer tray (220) and the second buffer tray (230).

5. The polyester polycondensation reactor according to claim 1, characterized in that: The material guide (210) comprises a guide cylinder (211), one end of the guide cylinder (211) is arranged as a closed end (212) arranged toward the feed pipe (110), the other end of the guide cylinder (211) is connected to the top edge of the first buffer plate (220), and the diameter of the guide cylinder (211) gradually increases from one side of the feed pipe (110) toward one side of the discharge port (120).

6. The polyester polycondensation reactor according to claim 1, characterized in that: It also includes a preheater (500), which is arranged on the feed pipe (110) and is used to preheat the material entering the feed pipe (110).

7. A polyester polycondensation reaction production method, characterized in that: Using the polyester polycondensation reactor according to any one of claims 1 to 6, the polyester polycondensation reaction production method comprises: adjusting the pressure inside the housing (100) to a preset pressure through the vacuum pipe (130); The temperature inside the housing (100) is adjusted to a preset temperature by means of the heating mechanism (400); The material is continuously transported into the housing (100) along the feed pipe (110), and the material is reacted within a preset reaction time through the material buffer mechanism (200) to generate a target product which is continuously discharged from the discharge port (120).

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