A raw material feeding device for polyester production

Abstract

The application discloses a raw material feeding equipment for polyester production and relates to the technical field of polyester production.The equipment body is used for mixing terephthalic acid and ethylene glycol, the inner cavity of the equipment body is filled with nitrogen, a first feeding port and a second feeding port are arranged at the top end of the side of the equipment body, the first feeding port and the second feeding port are respectively used for conveying terephthalic acid and ethylene glycol, a discharging port is arranged at the bottom center of the equipment body, the discharging port is used for outputting mixed terephthalic acid and ethylene glycol, and a pneumatic mechanism is arranged at the top end of the equipment body; the raw material feeding equipment does not need to additionally provide energy for stirring terephthalic acid and ethylene glycol, energy loss is saved, the stirring blade continuously stirs in the process of discharging terephthalic acid and ethylene glycol, and terephthalic acid and ethylene glycol are further stirred uniformly.

Description

Technical Field

[0001] This invention relates to the field of polyester production technology, and more specifically to a raw material feeding device for polyester production. Background Technology

[0002] Polyester production mainly includes transesterification polycondensation, direct esterification polycondensation, and ethylene oxide process. Among them, direct esterification polycondensation uses high-purity terephthalic acid and ethylene glycol to directly esterify to produce diethyl terephthalate or butyl terephthalate, and then carries out polycondensation reaction. The key to this method is to ensure that terephthalic acid and ethylene glycol are mixed evenly, to improve the reaction rate and to stop the etherification reaction. Therefore, the raw material feeding equipment used in polyester production needs to mix terephthalic acid and ethylene glycol evenly.

[0003] Existing raw material feeding equipment for polyester production adds terephthalic acid and ethylene glycol to a stirring tower and uses external power to stir the terephthalic acid and ethylene glycol to make them mix evenly. However, the external power increases energy consumption in the polyester production process, which increases the cost of polyester production. Summary of the Invention

[0004] In order to overcome the above-mentioned technical problems, the purpose of this invention is to provide a raw material feeding device for polyester production, so as to solve the problem that the prior art requires external power to mix terephthalic acid and ethylene glycol, which leads to increased energy consumption and increased production costs in the polyester production process.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A raw material feeding device for polyester production, comprising:

[0007] The main body of the equipment is used to mix terephthalic acid and ethylene glycol, and the inner cavity of the main body of the equipment is filled with nitrogen.

[0008] The first feed inlet and the second feed inlet are located at the top side of the main body of the equipment. The first feed inlet and the second feed inlet are used to convey terephthalic acid and ethylene glycol, respectively.

[0009] The discharge port is located at the center of the bottom surface of the main body of the equipment. The discharge port is used to output a uniformly mixed mixture of terephthalic acid and ethylene glycol.

[0010] A pneumatic mechanism is provided at the top of the main body of the equipment. The pneumatic mechanism is used to stir terephthalic acid and ethylene glycol and to discharge the uniformly mixed terephthalic acid and ethylene glycol using nitrogen pressure.

[0011] A floating mechanism is slidably mounted on the inner wall of the main body of the equipment, and the floating mechanism is used to drive the pneumatic mechanism.

[0012] As a further aspect of the present invention: the pneumatic mechanism includes a housing, the bottom surface of the housing is sealed to the top surface of the main body of the equipment, a sealing shell is fixedly connected to the bottom surface of the housing near the inner cavity of the main body of the equipment, an air supply channel is provided on the bottom surface of the housing near the sealing shell, and an internal cavity is provided inside the housing, the internal cavity being connected to the inner cavity of the main body of the equipment through the air supply channel.

[0013] As a further aspect of the present invention: a lead screw is mounted on one side of the bottom surface of the sealing shell via a bearing.

[0014] As a further aspect of the present invention: the floating mechanism includes a plurality of floats, the number of which is at least three; an arc-shaped ring is fixedly connected to the side of the plurality of floats; a slider is fixedly connected to the side of the arc-shaped ring away from the floats; and a groove that fits into the slider is provided on the side wall of the main body of the device near the slider.

[0015] As a further aspect of the present invention: a ball nut that engages with the lead screw is installed on the inner side of the float near the lead screw.

[0016] As a further aspect of the present invention: a transmission belt is engaged at the top of the lead screw, a transmission gear is engaged at the end of the transmission belt away from the lead screw, a driven gear is engaged on one side of the transmission gear, a stirring shaft is inserted inside the driven gear, and several sets of stirring blades are nested on the bottom side of the stirring shaft, with the several sets of stirring blades being inclined.

[0017] As a further aspect of the present invention: a threaded rod is engaged at the top end of the stirring shaft, and the threaded rod is mounted on the inner side of the gas delivery channel through a bearing and fits into the gas delivery channel.

[0018] The beneficial effects of this invention are:

[0019] With the pneumatic and floating mechanisms in place, as the liquid level in the inner cavity of the main body of the equipment rises, the floating mechanism also rises under the action of buoyancy. Therefore, without applying external power, the floating mechanism directly drives the pneumatic mechanism, so that the stirring blades in the pneumatic mechanism automatically stir terephthalic acid and ethylene glycol, saving energy.

[0020] Through the set gas delivery channel and threaded rod, nitrogen gas in the built-in cavity is pumped into the inner cavity of the main body of the equipment, ensuring that the nitrogen gas in the inner cavity of the main body of the equipment is under high pressure. During the discharge of terephthalic acid and ethylene glycol, the stirring blades will reverse. The reverse stirring blades will apply downward extrusion force to the terephthalic acid and ethylene glycol. Combined with the high-pressure nitrogen gas, the feeding efficiency of terephthalic acid and ethylene glycol will be further improved. Attached Figure Description

[0021] The invention will now be further described with reference to the accompanying drawings.

[0022] Figure 1 This is a schematic diagram of the structure of the present invention;

[0023] Figure 2 This is a cross-sectional view of the present invention;

[0024] Figure 3 This is a schematic diagram of the pneumatic mechanism structure in this invention;

[0025] Figure 4 This is a partial cross-sectional view of the pneumatic mechanism in this invention;

[0026] Figure 5 This is a schematic diagram of the floating mechanism in this invention.

[0027] In the diagram: 1. Main body of the equipment; 2. First feed inlet; 3. Second feed inlet; 4. Discharge outlet; 5. Pneumatic mechanism; 51. Outer shell; 52. Sealing shell; 53. Air supply channel; 54. Internal cavity; 55. Lead screw; 56. Transmission belt; 57. Transmission gear; 58. Driven gear; 59. Stirring shaft; 510. Stirring blade; 511. Threaded rod; 6. Floating mechanism; 61. Float; 62. Arc ring; 63. Sliding block; 64. Ball nut. Detailed Implementation

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

[0029] like Figures 1-5 As shown, a raw material feeding device for polyester production includes a main body 1, which is used to mix terephthalic acid and ethylene glycol. The inner cavity of the main body 1 is filled with nitrogen. A first feed port 2 and a second feed port 3 are provided at the top side of the main body 1. The first feed port 2 and the second feed port 3 are used to transport terephthalic acid and ethylene glycol, respectively. An outlet port 4 is provided at the center of the bottom surface of the main body 1. The outlet port 4 is used to output the uniformly mixed terephthalic acid and ethylene glycol. A pneumatic mechanism 5 is provided at the top of the main body 1. The pneumatic mechanism 5 is used to stir the terephthalic acid and ethylene glycol and to discharge the uniformly mixed terephthalic acid and ethylene glycol using the pressure of nitrogen. A floating mechanism 6 is slidably arranged on the inner wall of the main body 1. The floating mechanism 6 is used to drive the pneumatic mechanism 5.

[0030] During operation, as terephthalic acid and ethylene glycol are discharged into the inner cavity of the main body 1 through the first feed port 2 and the second feed port 3 respectively, the liquid level in the inner cavity of the main body 1 will gradually rise. The floating mechanism 6 will float on the liquid surface and rise along with the liquid level. During the rising process of the floating mechanism 6, it will drive the pneumatic mechanism 5, so that the pneumatic mechanism 5 can continuously stir the terephthalic acid and ethylene glycol. At the same time, it can gradually absorb and store the nitrogen in the main body 1. After the terephthalic acid and ethylene glycol are evenly stirred, as the floating mechanism 6 descends, the pneumatic mechanism 5 will discharge the nitrogen and act on the liquid surface of the mixed solution to improve the discharge efficiency of the mixed solution. Finally, the mixed solution can be passed into the reactor for polycondensation reaction to generate polyester.

[0031] like Figure 3 and Figure 4 As shown, the pneumatic mechanism 5 includes a housing 51, the bottom surface of the housing 51 is sealed to the top surface of the equipment body 1, a sealing shell 52 is fixedly connected to the bottom surface of the housing 51 near the inner cavity of the equipment body 1, an air supply channel 53 is provided on the side of the bottom surface of the housing 51 near the sealing shell 52, and an internal cavity 54 is provided inside the housing 51, which is connected to the inner cavity of the equipment body 1 through the air supply channel 53.

[0032] After terephthalic acid and ethylene glycol enter the inner cavity of the main body 1, nitrogen in the inner cavity of the main body 1 can enter the built-in cavity 54 through the gas delivery channel 53 and be stored in the built-in cavity 54.

[0033] like Figure 3 , Figure 4 and Figure 5 As shown, a lead screw 55 is mounted on one side of the bottom surface of the sealing shell 52 via a bearing. The floating mechanism 6 includes several floats 61, with at least three floats 61. An arc ring 62 is fixedly connected to the side of the floats 61. A slider 63 is fixedly connected to the side of the arc ring 62 away from the floats 61. A groove that matches the slider 63 is provided on the side wall of the main body 1 near the slider 63. A ball nut 64 that matches the lead screw 55 is installed on the inner side of the floats 61 near the lead screw 55.

[0034] As the liquid level in the inner cavity of the main body 1 rises or falls, the float 61 will also rise or fall synchronously. The float 61 is positioned horizontally by the arc ring 62 and the slider 63. Therefore, during the rise or fall of the float 61, the lead screw 55 will rotate due to the cooperation between the lead screw 55 and the ball nut 64.

[0035] like Figure 4As shown, a transmission belt 56 is engaged at the top of the lead screw 55, a transmission gear 57 is engaged at the end of the transmission belt 56 away from the lead screw 55, a driven gear 58 is engaged on one side of the transmission gear 57, a stirring shaft 59 is inserted inside the driven gear 58, and several sets of stirring blades 510 are nested on the bottom side of the stirring shaft 59, and the several sets of stirring blades 510 are inclined.

[0036] The rotating lead screw 55 drives the transmission gear 57 through the transmission belt 56, and the transmission gear 57 drives the stirring shaft 59 to rotate through the driven gear 58. The rotating stirring shaft 59 drives the stirring blades 510, and the stirring blades 510 continuously stir the terephthalic acid and ethylene glycol in the inner cavity of the main body 1 of the equipment. When the inclined stirring blades 510 rotate, they will stir the terephthalic acid and ethylene glycol upward, improve the stirring effect, and save energy without the need to provide additional energy for stirring the terephthalic acid and ethylene glycol.

[0037] like Figure 4 As shown, a threaded rod 511 is engaged at the top of the stirring shaft 59. The threaded rod 511 is mounted on the inner side of the gas delivery channel 53 through a bearing and is in mutual fit with the gas delivery channel 53.

[0038] When the stirring shaft 59 rotates, the top end of the stirring shaft 59 meshes with the threaded rod 511, and they are meshed together by helical gears. Therefore, the threaded rod 511 will rotate inside the gas delivery channel 53. During the rotation of the threaded rod 511, the threaded rod 511 and the gas delivery channel 53 form a structure similar to a vacuum pump, which can pressurize the nitrogen in the main body 1 into the internal cavity 54 through the gas delivery channel 53 and store it in the internal cavity 54. When the outlet 4 is opened to release terephthalic acid and ethylene glycol, the stirring shaft 59 will rotate in the opposite direction. Therefore, the nitrogen in the internal cavity 54 will be pumped into the internal cavity of the main body 1 through the gas delivery channel 53, ensuring that the nitrogen in the internal cavity of the main body 1 forms a high pressure and acts on the surface of the mixed liquid, so that the mixed solution can quickly enter the reaction vessel through the outlet 4 and improve the feeding efficiency.

[0039] Furthermore, during the discharge of terephthalic acid and ethylene glycol, the stirring blades 510 will reverse direction. The reversed stirring blades 510 will exert downward extrusion force on the terephthalic acid and ethylene glycol, which, together with high-pressure nitrogen, further improves the feeding efficiency of terephthalic acid and ethylene glycol.

[0040] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A raw material feeding device for polyester production, characterized in that, include: The main body of the equipment (1) is used to mix terephthalic acid and ethylene glycol, and the inner cavity of the main body of the equipment (1) is filled with nitrogen. The first feed port (2) and the second feed port (3) are located at the top side of the main body of the equipment (1). The first feed port (2) and the second feed port (3) are used to transport terephthalic acid and ethylene glycol, respectively. The discharge port (4) is located at the center of the bottom surface of the main body of the equipment (1). The discharge port (4) is used to output a uniformly mixed terephthalic acid and ethylene glycol. Pneumatic mechanism (5), which is located at the top of the main body (1) of the equipment, is used to stir terephthalic acid and ethylene glycol and to discharge the uniformly mixed terephthalic acid and ethylene glycol using the pressure of nitrogen. A floating mechanism (6) is slidably disposed on the inner wall of the main body (1) of the equipment. The floating mechanism (6) is used to drive the pneumatic mechanism (5). The pneumatic mechanism (5) includes a housing (51), the bottom surface of the housing (51) is sealed to the top surface of the equipment body (1), a sealing shell (52) is fixedly connected to the bottom surface of the housing (51) near the inner cavity of the equipment body (1), an air supply channel (53) is provided on the side of the bottom surface of the housing (51) near the sealing shell (52), and an internal cavity (54) is provided inside the housing (51), the internal cavity (54) is connected to the inner cavity of the equipment body (1) through the air supply channel (53); A lead screw (55) is mounted on one side of the bottom surface of the sealing shell (52) via a bearing; The floating mechanism (6) includes several floats (61), the number of floats (61) is at least three, and an arc ring (62) is fixedly connected to the side of the several floats (61). A slider (63) is fixedly connected to the side of the arc ring (62) away from the floats (61). A groove that fits with the slider (63) is opened on the side wall of the main body of the equipment (1) near the slider (63). The inner side of the float (61) near the lead screw (55) is equipped with a ball nut (64) that matches the lead screw (55). The top of the lead screw (55) is engaged with a transmission belt (56), and the end of the transmission belt (56) away from the lead screw (55) is engaged with a transmission gear (57). A driven gear (58) is engaged on one side of the transmission gear (57), and a stirring shaft (59) is inserted inside the driven gear (58). Several sets of stirring blades (510) are nested on the bottom side of the stirring shaft (59), and the several sets of stirring blades (510) are inclined. The top end of the stirring shaft (59) is engaged with a threaded rod (511), which is mounted on the inner side of the gas delivery channel (53) by a bearing and fits into the gas delivery channel (53).

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