Bottle-grade polyester chip solid phase polycondensation reactor

Abstract

The utility model belongs to the technical field of chemical equipment, and particularly relates to a bottle-grade polyester chip solid phase polycondensation reactor which comprises a main reactor, the main reactor comprises a cylindrical main body part and a cone part, and a cone, a composite cone, an annular lug plate and a splitter I are arranged at the junction of the cylindrical main body part and the cone part. A cavity II communicated with the cavity I is formed in the splitter I, a transverse sealing plate is arranged in the cavity I, an air hole is formed in the transverse sealing plate, an inner annular cylinder is arranged on the bottom surface of the transverse sealing plate, and an air supply hole I is formed in the peripheral wall of the inner annular cylinder; the top end of the composite cone penetrates through the inner annular cylinder and extends into the cavity I, an outer annular cylinder is arranged on the periphery of the composite cone, an air supply hole II is formed in the peripheral wall of the outer annular cylinder, the air supply hole I and the air supply hole II are both horizontally formed, a cavity III is formed in the annular lug plate, and nitrogen in the cavity III flows out through the air supply hole II. According to the utility model, the suspension of polyester chips is reduced, and the quality stability of products is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of chemical equipment, concretely relates to a bottle grade polyester chip solid phase polycondensation reactor. BACKGROUND

[0002] Solid state polycondensation (SSP) refers to the polycondensation reaction of monomers or prepolymers under solid state conditions, the process of condensation reaction of monomers or prepolymers with lower molecular weight by heating to above glass transition temperature and below melting point, the molecular weight is improved, the residual is removed, the molecular weight distribution is optimized, and the mechanical property is improved. At present, solid state polycondensation has been applied in the production of high quality polyethylene terephthalate (PET), polybutylene terephthalate (PBT) and the like.

[0003] The solid state polycondensation reaction is mainly carried out in the main reactor, the preheated PET chip enters the main reactor to carry out polycondensation reaction, and byproducts such as acetaldehyde and water generated in the process are carried out by nitrogen, wherein the nitrogen enters the bottom of the main reactor through the annular nitrogen distributor. It is found in actual use that the product discharged from the bottom of the main reactor is partially yellow, and the color value stability is poor. Therefore, it is necessary to improve the main reactor in order to obtain PET solid state polycondensation products with stable quality. CONTENT OF THE UTILITY MODEL

[0004] The utility model intends to provide a bottle grade polyester chip solid phase polycondensation reactor to solve the problem of poor product color value stability.

[0005] In order to achieve the above purpose, the scheme of the utility model is as follows: a bottle grade polyester chip solid phase polycondensation reactor, comprising a main reactor, the main reactor comprises a cylindrical main body part and a cone part, a conical body, a composite cone, an annular lug and a plurality of shunt sheets I are arranged at the junction of the cylindrical main body part and the cone part, the plurality of shunt sheets I are fixedly connected to the outer wall of the conical body along the circumference of the conical body, the inside of the conical body is provided with a cavity I, the inside of the shunt sheet I is provided with a cavity II, the cavity II is communicated with the cavity I, a horizontal sealing plate is arranged in the cavity I, a plurality of air holes are formed in the horizontal sealing plate, an inner annular cylinder is arranged on the bottom surface of the horizontal sealing plate, and a plurality of air supply holes I are formed in the circumferential wall of the inner annular cylinder; the top end of the composite cone penetrates through the inner annular cylinder and protrudes into the cavity I, an air chamber I is formed between the inner circumferential wall of the inner annular cylinder, the bottom surface of the horizontal sealing plate and the outer circumferential wall of the composite cone, an outer annular cylinder is arranged on the outer circumferential wall of the composite cone, a plurality of air supply holes II are formed in the circumferential wall of the outer annular cylinder, the air supply holes I and the air supply holes II are horizontally arranged, an air chamber II is formed between the outer circumferential wall of the outer annular cylinder, the bottom surface of the annular lug and the inner circumferential wall of the main reactor, the inside of the annular lug is provided with a cavity III, the cavity III is communicated with the air chamber II, and the cavity III and the cavity II are communicated with a nitrogen conveying pipe.

[0006] The working principle and beneficial effects of the present scheme are that in the present scheme, the nitrogen gas is divided into two streams entering the main reactor, one stream of nitrogen gas enters cavity II, then enters cavity I through the air hole, enters the air chamber I, and flows out through the air supply hole I, forming a nitrogen gas stream blowing from inside to outside in the radial direction; the other stream of nitrogen gas enters cavity III, then enters air chamber II through air supply hole II, and flows out, forming a nitrogen gas stream blowing from outside to inside in the radial direction. In this way, the nitrogen gas stream from inside to outside and the nitrogen gas stream from outside to inside act on the polyester chips in the main reactor, realizing the cooling of the polyester chips and taking away by-products such as acetaldehyde and water.

[0007] In addition, in the traditional main reactor, nitrogen gas is input into the main reactor only through the annular nitrogen gas distributor (specifically, the nitrogen gas stream in the traditional main reactor is initially blown downward), and the temperature of the nitrogen gas stream increases during downward transportation, and after encountering the conical surface in the main reactor, a diagonal upward gas stream is formed, and in this process, vortexes are easily formed in some areas, resulting in long-time suspension of some polyester chips, prolonged reaction time, and poor product color value and yellowing. In the present scheme, the nitrogen gas stream from inside to outside and the nitrogen gas stream from outside to inside blow transversely to form a transverse blowing nitrogen gas stream, changing the transportation direction of the nitrogen gas stream, avoiding the formation of vortexes of nitrogen gas, and the polyester chips can smoothly fall under the action of gravity, effectively reducing the suspension of the polyester chips at the junction of the cylindrical main body and the conical body, avoiding long-time reaction, thereby obtaining polyester chips with stable quality and improving the product quality stability.

[0008] Optionally, one end of the annular ear plate away from the inner circumferential wall of the main reactor is fixedly connected with a baffle.

[0009] In the present scheme, the baffle can prevent polyester chips from entering the air chamber II through the air supply hole II.

[0010] Optionally, the height of the baffle is less than or equal to half the height of the air supply hole II.

[0011] In the present scheme, the height of the baffle is limited to avoid a large impact of the baffle on the direction of the nitrogen gas stream blown out through the air supply hole II, and to ensure that the nitrogen gas stream blown out through the air supply hole II remains transverse.

[0012] Optionally, a plurality of flow dividing members are arranged in the cylindrical main body, the plurality of flow dividing members are distributed along the vertical direction of the cylindrical main body, each flow dividing member comprises a cylinder and a plurality of flow dividing plates II, the plurality of flow dividing plates II are distributed along the circumferential direction of the cylinder, and the flow dividing plates II in adjacent two flow dividing members are arranged in a staggered manner in the vertical direction.

[0013] In the present scheme, the flow dividing member is used to disperse the polyester chips sent from the top of the main reactor, so that the polyester chips have good dispersibility and uniform flowability.

[0014] Optionally, the top end of the main reactor is communicated with a nitrogen purifying device for filtering dust generated in the main reactor.

[0015] In the scheme, the nitrogen purifying device is used to suck out the nitrogen in the main reactor and take away by-products such as acetaldehyde and water, so as to promote the forward progress of the solid-phase polycondensation reaction, realize active exhaust, and realize the recovery of nitrogen.

[0016] Optionally, the nitrogen conveying pipe is provided with a gas flow meter and a thermometer.

[0017] In the scheme, the gas flow meter on the nitrogen conveying pipe is used to display the nitrogen flow, and the thermometer is used to display the nitrogen temperature, so as to provide data support for the staff to adjust the nitrogen flow and the nitrogen temperature. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a structure schematic view of the bottle-grade polyester chip solid-phase polycondensation reactor in the embodiment one of the utility model.

[0019] Figure 2 It is a partial longitudinal section view of the main reactor in the embodiment one of the utility model.

[0020] Figure 3 It is Figure 2 It is an enlarged schematic view of A in the embodiment one.

[0021] Figure 4 It is a distribution schematic view of the adjacent two shunt members in the embodiment one of the utility model.

[0022] Figure 5 It is a structure schematic view of the bottle-grade polyester chip solid-phase polycondensation reactor in the embodiment two of the utility model. DETAILED DESCRIPTION

[0023] The following is further described in detail through specific embodiments:

[0024] The marks in the drawings of the specification include: the main reactor 1, the cylindrical main body part 110, the cone body 120, the conical body 2, the cavity I 201, the composite cone 3, the annular lug 4, the cavity III 401, the baffle plate 410, the shunt piece I 5, the cavity II 501, the transverse sealing plate 6, the air hole 601, the inner annular cylinder 7, the air supply hole I 701, the air chamber I 8, the outer annular cylinder 9, the air supply hole II 901, the air chamber II 10, the nitrogen conveying pipe 11, the shunt member 12, the cylinder 1201, the shunt piece II 1202, the nitrogen purifying device 13, the discharging valve 14, the gas flow meter 15, and the thermometer 16.

[0025] Embodiment one

[0026] The embodiment is basically the same as Figure 1 and Figure 2As shown in the figure: a bottle-grade polyester chip solid-phase polycondensation reactor, which comprises a main reactor 1, the main reactor 1 comprises a cylindrical body part 110 and a cone part 120, a conical body 2, a composite cone 3, an annular lug 4 and a plurality of shunt pieces I 5 are arranged at the junction of the cylindrical body part 110 and the cone part 120, the plurality of shunt pieces I 5 are welded on the outer wall of the conical body 2 along the circumference of the conical body 2, and the outer end of the shunt piece I 5 is welded on the inner wall of the cylindrical body part 110. In this embodiment, the number of shunt pieces I 5 is six.

[0027] The inside of the conical body 2 is provided with a cavity I 201, the inside of the shunt piece I 5 is provided with a cavity II 501, the cavity II 501 communicates with the cavity I 201; a transverse sealing plate 6 is welded in the cavity I 201, and the transverse sealing plate 6 is combined with the inner wall of the cylindrical body part 110 and the outer wall of the conical body 2. Figure 3 As shown in the figure, a plurality of air holes 601 are arranged on the transverse sealing plate 6, and an inner annular cylinder 7 is welded on the bottom surface of the transverse sealing plate 6, a plurality of air supply holes I 701 are arranged on the peripheral wall of the inner annular cylinder 7, and the plurality of air supply holes I 701 are arranged along the circumference of the inner annular cylinder 7. In addition, the plurality of air holes 601 on the transverse sealing plate 6 all fall within the range of the inner annular cylinder 7.

[0028] The outer shape of the composite cone 3 is presented as two conical bodies spliced together, specifically, the round surfaces of the two conical bodies are connected. The top end of the composite cone 3 penetrates through the inner annular cylinder 7 and extends into the cavity I 201, the inner peripheral wall of the inner annular cylinder 7, the bottom surface of the transverse sealing plate 6 and the outer peripheral wall of the composite cone 3 form an air chamber I 8, the bottom end of the air chamber I 8 has a gap to prevent the accumulation of polyester chips in the air chamber I 8; the outer peripheral wall of the outer annular cylinder 9 is provided with a plurality of air supply holes II 901, the plurality of air supply holes II 901 are arranged along the circumferential direction of the outer annular cylinder 9, and the air supply holes I 701 and the air supply holes II 901 are both horizontally arranged; the outer peripheral wall of the outer annular cylinder 9, the bottom surface of the annular ear plate 4 and the inner peripheral wall of the main reactor 1 form an air chamber II 10, the bottom end of the air chamber II 10 has a gap to prevent the accumulation of polyester chips in the air chamber II 10. The inside of the annular ear plate 4 is provided with a cavity III 401, the cavity III 401 is communicated with the air chamber II 10, and the cavity III 401 and the cavity II 501 are both communicated with the nitrogen conveying pipe 11. The inner side end of the annular ear plate 4 (that is, the end of the annular ear plate 4 away from the inner peripheral wall of the main reactor 1) is welded with a baffle plate 410, the height of the baffle plate 410 is less than or equal to half of the height of the air supply hole II 901; in this embodiment, the height of the baffle plate 410 is half of the height of the air supply hole II 901, so as to avoid the polyester chips entering the air chamber II 10 through the air supply hole II 901, and to ensure that the baffle plate 410 will not have a great influence on the direction of the nitrogen gas flow blown out through the air supply hole II 901, and to ensure that the nitrogen gas flow blown out through the air supply hole II 901 remains horizontal. In addition, the bottom edge of the conical body 2 only blocks the upper half of the air supply hole I 701, so as to prevent the polyester chips from entering the air chamber I 8 through the air supply hole I 701, and to ensure that the bottom edge of the conical body 2 will not have a great influence on the direction of the nitrogen gas flow blown out through the air supply hole I 701, and to ensure that the nitrogen gas flow blown out through the air supply hole I 701 remains horizontal.

[0029] In combination Figure 4 As shown in the figure, a plurality of shunt members 12 are arranged in the cylindrical body part 110, and the plurality of shunt members 12 are distributed along the vertical direction of the cylindrical body part 110. In this embodiment, the number of shunt members 12 is eight. Each shunt member 12 includes a cylinder 1201 and a plurality of shunt pieces II 1202, the plurality of shunt pieces II 1202 are distributed along the circumferential direction of the cylinder 1201, and the shunt pieces II 1202 in adjacent two shunt members 12 are arranged in a staggered manner in the vertical direction. In this embodiment, the number of shunt pieces II 1202 in each shunt member 12 is eight, and the outer ends of the shunt pieces II 1202 are welded to the inner wall of the cylindrical body part 110. The top end of the cylindrical body part 110 is communicated with a nitrogen purification device 13 for filtering the dust generated in the main reactor, and the nitrogen purification device 13 is used to suck and filter the gas in the main reactor 1. In this embodiment, the nitrogen purification device 13 is a bag blowback filter. The bottom of the conical body part 120 is provided with a discharging valve 14, and the discharging valve 14 is provided with a gas locking device.

[0030] In use, the raw polyester chips enter the main reactor 1 through the top end of the cylindrical main body 110, and fall under the action of gravity. The raw polyester chips are dispersed by the flow dividing member 12 during the falling process, so that the raw polyester chips have good dispersibility and uniform flowability. The raw polyester chips fall in the main reactor 1 and perform solid-phase polycondensation reaction at the same time. During the reaction process, nitrogen is input into the main reactor 1 through the nitrogen conveying pipe 11 (the temperature of the nitrogen in the nitrogen conveying pipe 11 is 140-155°C). Specifically, the nitrogen is divided into two streams: one stream of nitrogen enters the cavity II 501 first, then enters the cavity I 201, then enters the air chamber I 8 through the air hole 601, and then flows out through the air supply hole I 701, thereby forming a horizontal nitrogen stream blowing from inside to outside in the radial direction of the main reactor 1; the other stream of nitrogen enters the cavity III 401, then enters the air chamber II 10, and then flows out through the air supply hole II 901, thereby forming a horizontal nitrogen stream blowing from outside to inside in the radial direction of the main reactor 1. In this way, the horizontal nitrogen stream blowing from inside to outside and the horizontal nitrogen stream blowing from outside to inside act on the polyester chips, so that the nitrogen and the polyester chips are in contact, thereby achieving cooling of the polyester chips. The nitrogen purifying device 13 is used to suck the gas in the main reactor 1, so as to take away the by-products such as acetaldehyde and water, and the nitrogen after being heated, filter the dust, promote the reaction in the main reactor 1 to proceed in a positive direction, and realize recovery of the nitrogen.

[0031] In addition, the inventor finds that, in the conventional main reactor, only the annular nitrogen distributor is used to input nitrogen into the main reactor 1 (specifically, compared with the main reactor 1 in the present embodiment, the conventional main reactor lacks the inner annular cylinder 7 and the outer annular cylinder 9), the nitrogen flows out through the air hole 601 and the air passage at the bottom of the annular lug plate 4 (the air passage refers to the passage connecting the cavity III 401 and the air chamber II 10), thereby forming a downward nitrogen stream in the conventional main reactor. The temperature of the nitrogen stream increases during the downward conveying process, and the nitrogen stream forms an upward slanting stream after encountering the tapered surface in the main reactor 1. In this process, vortexes are easily formed in some areas, thereby causing some polyester chips to be suspended for a long time, the reaction time of the polyester chips to be prolonged, the color value of the product to be deteriorated, the product to be yellow, and the quality of the polyester chips to be affected, thereby causing the product quality to be unstable. In the present embodiment, the horizontal nitrogen stream blowing from inside to outside and the horizontal nitrogen stream blowing from outside to inside are formed in the main reactor 1, thereby changing the conveying direction of the nitrogen stream, avoiding the nitrogen stream from colliding with the tapered surface of the composite cone 3 or the inner side wall of the tapered body 120 to form an upward slanting stream, thereby avoiding the nitrogen from forming vortexes, reducing the upward force of the nitrogen stream acting on the polyester chips, and enabling the polyester chips to smoothly fall under the action of gravity. The suspension of the polyester chips at the junction of the cylindrical main body 110 and the tapered body 120 is effectively reduced, the reaction time of the polyester chips is avoided to be prolonged, and polyester chips with stable quality are obtained, thereby improving the product quality stability.

[0032] Furthermore, in this embodiment, air supply hole I 701 and air supply hole II 901 are vertically offset. Thus, the transverse nitrogen airflow from the inside out and the transverse nitrogen airflow from the outside in are vertically offset. Therefore, the polyester chip is vertically misaligned and subjected to the force of transverse nitrogen airflow in two directions. The polyester chip is first subjected to the radial outward force of the main reactor 1, and then to the radial inward force of the main reactor 1. This causes the polyester chip to become unbalanced and more likely to fall off, further reducing the probability of the polyester chip being suspended.

[0033] The polyester chips after solid-phase polycondensation are fed through the bottom of the cone section 120, resulting in polyester chips with good color value and stable quality. During the feeding process, the externally introduced nitrogen gas is sealed through the feeding valve 14 by the gas lock device to prevent air from entering the bottom of the main reactor 1.

[0034] Example 2

[0035] The difference between this embodiment and Embodiment 1 is that: Figure 5 As shown in this embodiment, a gas flow meter 15 and a thermometer 16 are installed on the nitrogen delivery pipe 11. The gas flow meter 15 displays the nitrogen flow rate in the nitrogen delivery pipe 11, and the thermometer 16 displays the nitrogen temperature in the nitrogen delivery pipe 11, thereby providing data support for the staff to adjust the nitrogen flow rate and nitrogen temperature.

[0036] The above descriptions are merely embodiments of this utility model, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness or practicality of this utility model. The specific embodiments described in the specification can be used to interpret the claims.

Claims

1. A solid state polycondensation reactor for bottle grade polyester chips comprising a main reactor comprising a cylindrical main body portion and a tapered portion, characterized in that: The junction of the cylindrical main body part and the cone part is provided with a cone, a composite cone, an annular lug and a plurality of shunt pieces I, the plurality of shunt pieces I are fixedly connected to the outer wall of the cone along the circumference of the cone, the inside of the cone is provided with a cavity I, the inside of the shunt piece I is provided with a cavity II, the cavity II communicates with the cavity I, a transverse sealing plate is arranged in the cavity I, a plurality of air holes are arranged on the transverse sealing plate, an inner annular cylinder is arranged on the bottom surface of the transverse sealing plate, a plurality of air supply holes I are arranged on the peripheral wall of the inner annular cylinder; the top end of the composite cone penetrates through the inner annular cylinder and extends into the cavity I, an air chamber I is formed between the inner peripheral wall of the inner annular cylinder, the bottom surface of the transverse sealing plate and the outer peripheral wall of the composite cone, an outer annular cylinder is arranged on the outer peripheral wall of the composite cone, a plurality of air supply holes II are arranged on the peripheral wall of the outer annular cylinder, the air supply holes I and the air supply holes II are both horizontally arranged, an air chamber II is formed between the outer peripheral wall of the outer annular cylinder, the bottom surface of the annular lug and the inner peripheral wall of the main reactor, the inside of the annular lug is provided with a cavity III, the cavity III communicates with the air chamber II, the cavity III and the cavity II are both communicated with a nitrogen conveying pipe.

2. The bottle grade polyester chip solid phase polycondensation reactor according to claim 1, characterized in that: The annular lug is fixedly connected with a baffle plate at the end away from the inner peripheral wall of the main reactor.

3. The bottle grade polyester chip solid phase polycondensation reactor according to claim 2, characterized in that: The height of the baffle plate is less than or equal to half of the height of the air supply holes II.

4. The bottle grade polyester chip solid state polycondensation reactor according to claim 1, characterized in that: A plurality of shunt members are arranged in the cylindrical main body part, the plurality of shunt members are distributed along the vertical direction of the cylindrical main body part, each shunt member comprises a cylinder and a plurality of shunt pieces II, the plurality of shunt pieces II are distributed along the circumference of the cylinder, and the shunt pieces II in adjacent two shunt members are vertically staggered.

5. The bottle grade polyester chip solid phase polycondensation reactor according to claim 1, characterized in that: The top end of the main reactor is communicated with a nitrogen purification device for filtering the dust generated in the main reactor.

6. The bottle grade polyester chip solid state polycondensation reactor according to claim 1, characterized in that: A gas flow meter and a thermometer are arranged on the nitrogen conveying pipe.

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