Up-flow pre-polycondensation reactor with zero waste discharge of materials

Abstract

The invention discloses an up-flow pre-polycondensation reactor with zero waste discharge of materials, and aims to overcome the defects that materials in a reactor cannot be completely discharged and can be completely discharged only after being diluted and decomposed by injecting a large amount of EG (Ethylene Glycol) in the prior art. According to the technical scheme, the pre-polycondensation reactor comprises a pre-polycondensation reactor shell and a tower tray structure arranged on the pre-polycondensation reactor shell, a liquid distribution annular plate is arranged in the circumferential direction of the upper end face of an edge tower tray plate, and the edge, close to the edge tower tray plate, of the liquid distribution annular plate is provided with a first liquid leakage tooth seam; a second liquid leakage tooth seam is formed in the edge, close to the central tray plate, of the central cap hood. By arranging the first liquid leakage tooth seams and the second liquid leakage tooth seams, all materials on the tower tray can penetrate through the cap cover tooth seams to be reversely discharged during shutdown, so that the materials can be completely discharged without injecting a large amount of EG (Ethylene Glycol) to dilute and decompose the materials, and the tower cover has the characteristics of convenience and safety in operation. EG consumption is reduced during shutdown, and the yield of unqualified products is reduced during startup.

Description

Technical Field

[0001] The invention relates to the technical field of pre-polycondensation reactors, and more particularly to an upflow pre-polycondensation reactor with zero material waste discharge. Background Art

[0002] In the production process of PET, PTT, PBT, and PBAT, it is usually divided into three stages: esterification, pre-polycondensation, and final polycondensation. The pre-polycondensation reactor is an important equipment used in the pre-polycondensation reaction process. There are two structural forms of existing pre-polycondensation reactors, one is the traditional kettle reactor with a stirrer, and the other is the upflow tower reactor without a stirrer. Reactors with stirring are prone to cause material back mixing, affecting the uniformity of the reaction. The upflow tower reactor is not equipped with an agitator. Multiple layers of trays are installed inside the reactor. The liquid material (ester) enters from the bottom of the reactor and is discharged from the top of the reactor. The trays are filled with liquid material. The material enters the first tray (the bottom layer) from the edge riser of the first tray, and the material flows centripetally on the first tray; the material then enters the second tray from the center riser of the second tray, and the material flows centrifugally on the second tray; the material then enters the third tray, the fourth tray, the fifth tray, and so on in turn until the top tray. The liquid material flows upward in the reactor along the axial direction of the reactor. The flow of the liquid material inside the reactor is close to plug flow, and the residence time of the liquid material is uniform, so the molecular weight distribution of the polymer is narrow.

[0003] EG in the liquid material vaporizes to form tiny bubbles dispersed in the liquid material, and the material forms gas-liquid two-phase co-flow and flows upward, and the bubbles stir the liquid material in the reactor to increase the mass transfer rate; the pressure of the liquid material gradually decreases during the upward flow, and the EG small bubbles in the material gradually increase, which enhances the stirring effect on the liquid material, and is beneficial to the removal of EG generated by the polycondensation reaction, which is beneficial to the polycondensation reaction. Since the upflow tower reactor does not need to be equipped with a mechanical agitator, it has low energy consumption, does not require mechanical maintenance, and has a long online cycle, making it an ideal pre-polycondensation reactor.

[0004] The upflow tower reactors in the prior art have two major serious deficiencies.

[0005] (1) The radial flow (centrifugal flow or centripetal flow) of the liquid material inside the reactor has poor stirring and mixing effects. There are areas where the material flows faster and areas where the material flows slower, resulting in inconsistent material residence time. Especially when the production load is high, the pre-polycondensation reaction of the material is uneven, the molecular weight distribution of the polymer is wide, and a large amount of unreacted white powder will appear in the vacuum system of the reactor. These white powders and small molecular weight oligomers are easy to block the subsequent vacuum system; (2) The material in the upflow tower reactor cannot be completely discharged. Although there are multiple φ8mm tear holes on the tower plate of the upflow tower reactor for discharging the material, a large amount of EG needs to be injected into the reactor to dilute and decompose the material before it can be completely discharged, resulting in a large amount of polymer and EG waste. After the material is cracked, a large amount of harmful gas is generated, which endangers the health of personnel, and the discharge lasts for about 2 days.

[0006] Chinese patent announcement number CN114534624B, announcement date April 19, 2024, the name of the invention is a tower precondensation reaction, the application discloses a precondensation reactor, which has reciprocating flow / overflow on each layer of the tower plate, and liquid film flow can be realized at the overflow port, which increases the gas-liquid contact area and is beneficial to the mass transfer and evaporation of EG; however, the material in the reactor cannot be discharged cleanly, and a large amount of EG needs to be injected into the reactor to dilute and decompose the material before it can be discharged cleanly, resulting in a large amount of polymer and EG waste, and a large amount of harmful gas is generated after the material is cracked, which endangers the health of personnel. Summary of the invention

[0007] The present invention overcomes the following two deficiencies in the prior art: (1) the pre-condensation reaction of the material is uneven, the molecular weight distribution of the polymer is wide, and a large amount of unreacted white powder will appear in the vacuum system of the reactor. These white powders and small molecular weight oligomers are easy to block the subsequent vacuum system; (2) the material in the reactor cannot be completely discharged, and it is necessary to inject a large amount of EG to dilute and decompose the material before it can be completely discharged, resulting in a large amount of polymer and EG waste, and a large amount of harmful gas is generated after the material is cracked, which endangers the health of personnel; an upflow pre-condensation reactor with zero material discharge is provided, which can allow liquid to enter and exit the cap through the openings and tooth gaps (bottom gaps) on the cap, ensuring that the liquid material can be three-dimensionally, omnidirectionally and evenly distributed on the tower plate, and the gas is always evenly distributed in the liquid material in the form of small bubbles, so that the reaction can be more sufficient; when the machine is shut down, all the materials on the tower plate can be reversely discharged through the tooth gaps of the cap.

[0008] In order to solve the above technical problems, the present invention adopts the following technical solution: an upflow pre-polycondensation reactor with zero material waste discharge, comprising: The pre-polycondensation reactor shell has a material inlet and a material outlet at the bottom and top respectively; A plurality of tray structures are stacked and arranged on the shell of a precondensation reactor, the tray structure comprises an edge riser tray and a center riser tray arranged in sequence along the vertical direction; the edge riser tray comprises an edge tray plate and a liquid distribution ring plate, the liquid distribution ring plate is arranged along the circumferential direction of the upper end surface of the edge tray plate, and the edge of the liquid distribution ring plate close to the edge tray plate is provided with a first liquid leakage tooth gap; the center riser tray comprises a center tray plate and a center cap cover, and the edge of the center cap cover close to the center tray plate is provided with a second liquid leakage tooth gap; A sealing component is arranged between the circumferential direction of the central liquid riser tray structure and the shell of the pre-polycondensation reactor.

[0009] In the present invention, by setting the first liquid leakage tooth gap and the second liquid leakage tooth gap, the material can flow out completely from top to bottom. When the machine is shut down, all the materials on the tray can be discharged in the reverse direction through the cap cover tooth gap, so it is not necessary to inject a large amount of EG to dilute and decompose the materials before they can be discharged cleanly, which has the characteristics of convenient operation and safety. In addition, in the present invention, the flow direction of the material is to flow from the circular hole on the side wall of the liquid distribution ring plate to the center position, then flow from the center position of the edge tray plate into the center cap cover, and then flow from the circular hole on the center cap cover to the surroundings, so that the material flows in the direction of "from the surroundings to the center" and "from the center to the surroundings", thereby ensuring that the liquid material can be three-dimensionally, comprehensively and evenly distributed on the tray plate, and the gas is always evenly distributed in the liquid material in the form of small bubbles, so that the reaction can be more sufficient.

[0010] Preferably, a stiffening ring plate is provided in the circumferential direction of the upper end surface of the center tower plate, a sealing assembly fixing ring is provided in the circumferential direction of the outer side wall of the stiffening ring plate, and the sealing assembly is provided on the sealing assembly fixing ring.

[0011] The sealing assembly is arranged on a sealing assembly fixing ring, and the sealing assembly fixing ring plays a supporting role for the sealing assembly.

[0012] Preferably, the sealing assembly includes a packing support ring, a sealing packing and a clamping assembly, a retaining ring is fixedly arranged on the packing support ring, and the sealing packing is arranged between the retaining ring and the precondensation reactor shell; the clamping assembly fixes the sealing packing on the support ring.

[0013] Through the above structure, the sealing filler can achieve a better sealing effect between the sealing component fixing ring and the tower shell cylinder.

[0014] Preferably, the clamping assembly includes a pressure plate, a pressure ring and a connecting screw; the cross-section of the pressure plate is L-shaped, the vertical section of the pressure plate abuts against the packing support ring, and the pressure ring is arranged on the upper end surface of the sealing packing; the connecting screw passes through the horizontal section of the pressure plate and is connected to the packing support ring, and the horizontal section of the pressure plate presses the pressure ring onto the sealing packing.

[0015] Through the above structure, the sealing filler can be tightly pressed against the sealing component fixing ring, thereby achieving a better sealing effect between the sealing component fixing ring and the tower shell cylinder.

[0016] Preferably, an edge cap is provided on the end surface of the edge tray plate close to the center tray plate, and a riser corresponding to the edge cap is provided on the end surface of the center tray plate close to the edge tray plate, with a gap provided between the riser and the edge cap.

[0017] This allows the material to flow from the riser pipe toward the center cap.

[0018] Preferably, the central cap comprises a cylinder and a top cover arranged above the cylinder, and circular holes are evenly distributed on the top cover and the cylinder; a liquid rising port is provided at the center position of the central tower plate, the cylinder is arranged on the upper end surface of the liquid rising port, and the second liquid leakage tooth gap is arranged at the edge position of the cylinder close to the liquid rising port.

[0019] When the material flows through the circular holes, it ensures that the liquid material can be distributed three-dimensionally, comprehensively and evenly on the tower plate, and the gas is always evenly distributed in the liquid material in the form of small bubbles, so that the reaction can be more complete.

[0020] Preferably, an annular plate is provided in the circumferential direction of the other side of the edge tray plate relative to the edge riser plate.

[0021] By setting the axial length of the control ring plate, the height of the gap between the ring plate and the bottom center tower plate can be controlled.

[0022] Preferably, the first liquid leakage tooth gap and the second liquid leakage tooth gap are both trapezoidal.

[0023] Since the trapezoidal structure is small at the top and large at the bottom, the material can flow downward from the large opening at the bottom more smoothly.

[0024] Preferably, a bubble cap is arranged on the top of the plurality of tray structures, and the bubble cap comprises a bubble cap top cover, a bubble cap cylinder and a corrugated plate.

[0025] The corrugated plates are installed in the bubble cylinder according to a certain spacing and arrangement.

[0026] Preferably, the precondensation reactor shell includes a tower shell cylinder and a tower shell cylinder expansion section, and the tower shell cylinder and the tower shell cylinder expansion section are connected by a cone; a tower top head is arranged at the top of the tower shell cylinder expansion section; a tower bottom head is arranged at the bottom of the tower shell cylinder, and the material inlet is arranged at the bottom of the tower bottom head.

[0027] The above structure enables a bubble cap to be arranged at the upper end of the pre-polycondensation reactor, and a tray structure to be arranged in the tower shell cylinder.

[0028] Compared with the prior art, the present invention has the following beneficial effects: In the present invention, by setting the first liquid leakage tooth gap and the second liquid leakage tooth gap, the material can flow out completely from top to bottom. When the machine is shut down, all the materials on the tray can be discharged in the reverse direction through the cap cover tooth gap, so it is not necessary to inject a large amount of EG to dilute and decompose the materials before they can be discharged cleanly, which has the characteristics of convenient operation and safety. In addition, in the present invention, the flow direction of the material is to flow from the circular hole on the side wall of the liquid distribution ring plate to the center position, then flow from the center position of the edge tray plate into the center cap cover, and then flow from the circular hole on the center cap cover to the surroundings, so that the material flows in the direction of "from the surroundings to the center" and "from the center to the surroundings", thereby ensuring that the liquid material can be three-dimensionally, comprehensively and evenly distributed on the tray plate, and the gas is always evenly distributed in the liquid material in the form of small bubbles, so that the reaction can be more sufficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic structural diagram of the pre-polycondensation reaction shell of the present invention.

[0030] Figure 2 It is a schematic structural diagram of the edge riser tray of the present invention.

[0031] Figure 3 1 is a top view of an edge riser tray of the present invention.

[0032] Figure 4 It is a schematic structural diagram of the edge cap of the present invention.

[0033] Figure 5 It is a structural schematic diagram of the central liquid riser tray of the present invention.

[0034] Figure 6 It is a top view of the center riser tray of the present invention.

[0035] Figure 7 It is a schematic structural diagram of the center cap cover in Example 1 of the present invention.

[0036] Figure 8 It is a top view of the center cap in Example 1 of the present invention.

[0037] Fig. 9 It is a schematic structural diagram of the center cap cover in Example 2 of the present invention.

[0038] Fig.10 It is a top view of the center cap in Example 2 of the present invention.

[0039] Fig.11 It is a schematic structural diagram of a blister of the present invention.

[0040] Fig.12 yes Fig.11 Cross-sectional view along the AA direction.

[0041] Fig.13 It is a schematic structural diagram of the sealing assembly of the present invention.

[0042] Fig.14 It is a schematic diagram of the operation flow of the present invention.

[0043] In the figure: 1, pre-polycondensation reactor shell, 1-1, tower bottom head, 1-2, tower shell cylinder, 1-3, cone, 1-4, tower shell cylinder expansion section, 1-5, shell flange, 1-6, tower shell head, 1-7, material inlet, 1-8, material outlet, 1-9, gas phase outlet; 2. Tower tray structure, 2-1. Edge liquid riser tray, 2-1-1. Edge tray plate, 2-1-2. Center hole, 2-1-3. Edge cap, 2-1-4. Ring plate, 2-1-5. Liquid distribution ring plate, 2-2. Center liquid riser tray, 2-2-1. Center tray plate, 2-2-2. Liquid riser port, 2-2-3. Liquid riser, 2-2-4. Center cap, 2-2-4-1. Cylinder, 2-2-4-2. Top cover, 2-2-5. Stiffening ring plate, 2-2-6. Sealing assembly fixing ring, 2-2-7. Bottom gap; 3. blister, 3-1. top cover, 3-2. cylinder, 3-3. corrugated plate; 4. Fixed distance pipe; 5. Pull rod; 6. Sealing assembly, 6-1. Packing support ring, 6-2. Retaining ring, 6-3. Sealing packing, 6-4. Pressing ring, 6-5. Pressing plate, 6-6. Hexagon socket screw; 7. Circulation pump, 8. Inlet pipeline, 9. Outlet pipeline, 10. Inlet pipeline three-way valve, 11. Outlet pipeline three-way valve, 12. Final polycondensation reactor, DETAILED DESCRIPTION

[0044] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings: Example 1: Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig.11 , Fig.12 , Fig.13 , Fig.14As shown, a zero-waste upflow precondensation reactor is provided, wherein the zero-waste upflow precondensation reactor adopts a vertical, jacketed structure, and comprises: a precondensation reactor shell 1 and a tower plate structure 2 installed inside the reactor shell 1, wherein a plurality of tower plate structures 2 are provided, and the plurality of tower plate structures 2 are stacked in a vertical direction. The pre-condensation reactor shell 1 adopts a jacket structure, including the tower bottom head 1-1, the tower shell cylinder 1-2, the cone 1-3, the tower shell cylinder expansion section 1-4, the shell flange 1-5 and the tower top head 1-6, which are connected in sequence from bottom to top to form the pre-condensation reactor shell 1, and the reactor shell 1 is provided with internal parts, which include a plurality of tower plate structures 2 arranged inside the tower shell cylinder 1 and a bubble cap (baffle type demister) 3 installed at the upper end of the tower plate structure, wherein the tower plate structure includes an edge riser tower plate 2-1 and a center riser tower plate 2-2, wherein the edge riser tower plate 2-1 is arranged at the bottom and the center riser tower plate 2-2 is arranged at the top. The tower plate structure 2 is supported and fixed on the support inside the tower shell cylinder 1-2 by a distance tube 4 and a tie rod 5, and the gap between the center riser tower plate 2-2 and the tower shell cylinder 1-2 is sealed by a segmented, detachable sealing component 6.

[0045] like Figure 1 As shown, the pre-polycondensation reactor shell 1 includes the tower bottom head 1-1, the tower shell cylinder 1-2, the cone 1-3, the tower shell cylinder expansion section 1-4, the shell flange 1-5 and the tower shell head 1-6, which are sequentially connected from bottom to top to form the pre-polycondensation reactor shell 1. The bottom of the tower bottom head 1-1 is provided with a material inlet 1-7, the bottom of the cone 1-3 is provided with a material outlet 1-8, and the top of the tower shell head 1-6 is provided with a gas phase outlet 1-9.

[0046] The internal parts include a plurality of tray structures 2 arranged inside the tower shell cylinder 1-2 and the bubble cap (baffle type demister) 3 installed at the upper end of the tray structure 2, wherein the tray structure 2 includes the edge riser tray 2-1 and the center riser tray 2-2 alternately connected to form the tray structure 2.

[0047] like Figure 2 , Figure 3 and Figure 4As shown, the edge riser tray 2-1 is a monolithic, annular structure, and the edge riser tray comprises an edge tray plate 2-1-1 and a liquid distribution ring plate 2-1-5. A center hole 2-1-2 is opened at the center position of the edge tray plate 2-1-1, and an edge cap 2-1-3 is provided on one side of the center hole 2-1-2 of the edge tray plate 2-1-1. The edge cap 2-1-3 is cylindrical, and the edge cap 2-1-3 is provided with a large-diameter arc top plate. The outer diameter of the edge cap 2-1-3 is the same as the outer diameter of the riser tube 2-2-3 of the center riser tray 2-2. When assembled, the edge cap 2-1-3 side faces upward. A ring plate 2-1-4 is provided on the side of the edge of the edge tower plate 2-1-1 opposite to the edge cap cover 2-1-3, and a liquid distribution ring plate 2-1-5 is provided on the same side of the edge of the edge tower plate 2-1-1 as the edge cap cover 2-1-3. The ring plate 2-1-4 and the liquid distribution ring plate 2-1-5 are both vertically arranged with the edge tower plate 2-1-1, and circular holes are evenly arranged and penetrated in the middle of the liquid distribution ring plate 2-1-5. One end of the liquid distribution ring plate 2-1-5 is smooth, and the end of the liquid distribution ring plate 2-1-5 close to the edge tower plate 2-1-1 is evenly distributed with first liquid leakage tooth gaps. The first liquid leakage tooth gap in the present embodiment is a trapezoidal shape with a narrow upper end and a wide lower end, and the tooth top at the edge of the liquid distribution ring plate 2-1-5 is welded to the edge plate of the tower plate 2-1-1.

[0048] The characteristics are: the whole tower plate is easy to install, no splicing and adjustment are required during the assembly process, and the assembly workload is small. The liquid material can enter and exit the edge riser pipe 2-2-3 through the circular hole and the first liquid leakage tooth gap on the liquid distribution ring plate 2-1-5, ensuring that the material is evenly distributed on the edge tower plate 2-1-1, and the gas is always evenly distributed in the liquid material in the form of small bubbles. When shutting down, all the materials on the tower plate can be reversely discharged through the first liquid leakage tooth gap of the liquid distribution ring plate 2-1-5.

[0049] like Figure 5 and Figure 6 As shown, the central liquid riser plate 2-2 is a monolithic, annular structure, a liquid rise port 2-2-2 is opened at the central position of the plate plate 2-2-1, the liquid riser 2-2-3 and the central cap cover 2-2-4 are respectively provided on both sides of the liquid rise port 2-2-2, a stiffening ring plate 2-2-5 is provided on the edge of the central plate plate 2-2-1, the stiffening ring plate 2-2-5 is vertically arranged with the central plate plate 2-2-1, the outer ring of the top of the stiffening ring plate 2-2-5 on the same side of the central cap cover 2-2-4 is provided with the sealing assembly fixing ring 2-2-6, the sealing assembly fixing ring 2-2-6 is vertically arranged with the stiffening ring plate 2-2-5 and parallel with the plate plate 2-2-1, and a plurality of through holes are evenly distributed on the sealing assembly fixing ring 2-2-6.

[0050] like Figure 7 and Figure 8 As shown, the central cap cover 2-2-4 includes a cylinder 2-2-4-1 and a top cover 2-2-4-2, the top cover 2-2-4-2 is welded to one end of the cylinder 2-2-4-1, the top cover 2-2-4-2 is a large diameter arc plate, the top cover 2-2-4-2 is provided with a certain number of circular liquid distribution holes, the cylinder wall of the cylinder 2-2-4-1 near one end of the top cover 2-2-4-2 is provided with many small circular holes or gaps, the cylinder wall of the other end of the cylinder 2-2-4-1 is provided with a second liquid leakage tooth gap, the second liquid leakage tooth gap in this embodiment is a trapezoidal shape with a narrow upper end and a wide lower end, and the tooth top at the edge of the cylinder 2-2-4-1 is directly welded to the central liquid riser tray plate 2-2-1. When assembled, the central cap cover 2-2-4 side faces upward.

[0051] The characteristic is that the liquid can enter and exit the central cap cover 2-2-4 through the opening on the central cap cover 2-2-4 and the second liquid leakage tooth gap (bottom gap), ensuring that the liquid material can be three-dimensionally, omnidirectionally and evenly distributed on the central tray plate 2-2-1, and the gas is always evenly distributed in the liquid material in the form of small bubbles. When the machine is shut down, all the materials on the central riser tray 2-2 can be discharged in the reverse direction through the second liquid leakage tooth gap.

[0052] like Fig.11 and Fig.12 As shown, the bubble cap (baffle type demister) 3 comprises a bubble cap top cover 3-1, a bubble cap cylinder 3-2 and a corrugated plate 3-3. The bubble cap top cover 3-1 is a large diameter arc plate. The bubble cap top cover 3-1 is welded and fixed to one end of the bubble cap cylinder 3-2. The other end of the bubble cap cylinder 3-2 is welded with a plurality of corrugated plates 3-3 fixed at a certain spacing and arrangement.

[0053] like Fig.13As shown, the gap between the central liquid riser tray 2-2 and the tower shell cylinder 1-2 is sealed by the segmented, detachable sealing assembly 6, and the sealing assembly 6 includes a packing support ring 6-1, a retaining ring 6-2, a sealing packing 6-3, a pressure ring 6-4, a pressure plate 6-5 and connecting screws. The connecting screws in this embodiment are hexagon socket screws 6-6. The packing support ring 6-1 is a ring plate with a width of about 50 mm. There are a number of through holes evenly distributed on the circumference close to the inner circle of the packing support ring 6-1. The through holes on the packing support ring 6-1 correspond to the threaded holes on the sealing assembly fixing ring 2-2-6 one by one. The packing support ring 6-1 is fixed to the sealing assembly fixing ring 2-2-6 by the hexagon socket screw 6-6. The retaining ring 6-2 is fixed to the annular surface of the packing support ring 6-1 close to the outer circle by welding. The sealing packing 6-3 is installed between the tower shell cylinder 1-2 and the retaining ring 6-2. On the packing support ring 6-1, the sealing packing 6-3 is a carbon fiber packing, the pressure ring 6-4 is installed on the sealing packing 6-3 between the tower shell cylinder 1-2 and the retaining ring 6-2, the pressure ring 6-4 is an open circular ring, the pressure plate 6-5 is an L-shaped angle steel with a width of about 20 mm, the horizontal section of the pressure plate 6-5 is pressed on the top of the pressure ring 6-4, and the vertical section of the pressure plate 6-5 is supported on the upper end surface of the packing support ring 6-1, and the hexagon socket screw 6-6 passes through the pressure plate 6-5 and is fixed on the packing support ring surface 6-1 and is tightened by the hexagon socket screw 6-6.

[0054] The characteristics are: the diameter of the central liquid riser tower plate 2-2 can be appropriately reduced to facilitate the lifting and adjustment of the central liquid riser tower plate 2-2 inside the tower shell cylinder 1-2; the sealing component adopts a segmented detachable structure, and multiple sealing fillers 6-3 can be installed to ensure the sealing performance, prevent the material from axially mixing and affecting the product quality, and facilitate the removal, installation and replacement of the sealing component.

[0055] The working principle of the tower plate structure is as follows: the material flows into the tower shell cylinder 1-2 from the material inlet 1-7, and then the material flows into the channel between the outer wall of the ring plate 2-1-4 and the inner wall of the tower shell cylinder 1-2 from the gap at the lower end of the ring plate 2-1-4, flows upward along the channel between the outer wall of the ring plate 2-1-4 and the inner wall of the tower shell cylinder 1-2, and then flows into the upper end of the edge tower plate 2-1-1 from the circular hole on the liquid distribution ring plate 2-1-5, and then the material converges toward the center, and then flows through the liquid riser port 2-2-2 from the gap between the edge cap cover 2-1-3 and the liquid riser 2-2-3, and then flows out from the circular hole on the center cap cover 2-2-4, and the above process is repeated until it flows into the bubble cap 3.

[0056] When the material needs to be discharged, the material is on the central tower plate 2-2-1, and the material then flows downward from the second liquid leakage tooth gap on the central cap cover 2-2-4 through the liquid riser 2-2-2, and then flows from the gap between the top of the edge cap cover 2-1-3 and the liquid riser 2-2-3 to the top of the edge tower plate 2-1-1, and then flows from the first liquid leakage tooth gap on the side wall of the liquid distribution ring plate 2-1-5 into the channel between the outer wall of the ring plate 2-1-4 and the inner wall of the tower shell cylinder 1-2, and then flows into the central tower plate 2-2-1, and the above process is repeated until it flows out from the material inlet 1-7 at the bottom of the tower shell cylinder 1-2.

[0057] In the present invention, by setting the first liquid leakage tooth gap and the second liquid leakage tooth gap, the material can flow out completely from top to bottom. When the machine is shut down, all the materials on the tray can be discharged in reverse through the cap cover tooth gap, so there is no need to inject a large amount of EG to dilute and decompose the materials before they can be discharged cleanly, which has the characteristics of convenient operation and safety. In addition, in the present invention, the flow direction of the material is to flow from the circular hole on the side wall of the liquid distribution ring plate 2-1-5 to the center position, and then flow from the center position of the edge tray plate 2-1-1 into the center cap cover 2-2-4, and then flow from the circular hole on the center cap cover 2-2-4 to the surroundings, so that the material flows in the direction of "from the surroundings to the center" and "from the center to the surroundings", thereby ensuring that the liquid material can be three-dimensionally, comprehensively and evenly distributed on the tray plate, and the gas is always evenly distributed in the liquid material in the form of small bubbles, so that the reaction can be more sufficient.

[0058] The working principle of this embodiment is as follows: A loop pipeline is provided between the material inlet 1-7 located at the bottom of the pre-polycondensation reactor and the material outlet 1-8 located at the upper part of the pre-polycondensation reactor.

[0059] like Fig.14 As shown, the loop pipeline includes: a circulation pump 7, an inlet pipeline 8 of the circulation pump 7, an inlet pipeline three-way valve 10, an outlet pipeline 9 of the circulation pump 7 and an outlet pipeline three-way valve 11.

[0060] When the pre-polycondensation reactor is in operation, the inlet pipeline three-way valve 10 and the outlet pipeline three-way valve 11 of the loop pipeline are in a closed state. The material enters the interior of the tower shell cylinder 1-2 from the material inlet 1-7 at the bottom to undergo polycondensation reaction. When the material index is qualified, the material flows out (or is pumped) from the material outlet 1-8 located at the upper part of the pre-polycondensation reactor shell 1 to the final polycondensation reactor 12 (next process).

[0061] When the zero-waste upflow precondensation reactor is shut down, after the precondensation reactor shell stops feeding, when no material can be detected on the top central riser tray 2-2, the inlet pipeline three-way valve 10 at the material inlet 1-7 of the precondensation reactor and the pipeline outlet three-way valve 11 at the material outlet 1-8 are closed, the inlet pipeline three-way valve 10 and the outlet pipeline three-way valve 11 of the loop pipeline are opened, a closed circulation loop is formed between the precondensation reactor and the loop pipeline, and the circulation pump 7 is started. , the material flows out from the material inlet 1-7 located at the bottom of the pre-polycondensation reactor shell 1 and enters the inlet pipeline 8 of the circulation pump 7. After the material is pressurized by the circulation pump 7, the material flows through the outlet pipeline 9 and enters the interior of the pre-polycondensation reactor shell 1 from the material outlet 1-8 located at the upper part of the pre-polycondensation reactor shell 1. The material continues the polycondensation reaction. After a period of time, the material is pressurized by the circulation pump 7, and the material no longer returns to the pre-polycondensation reactor 1 but is sent to the final polycondensation reactor 12 (next process). Close the inlet pipeline three-way valve 10 and the outlet pipeline three-way valve 11 at both ends of the loop pipeline, and drain the materials in the inlet pipeline 8, the circulation pump 7 and the outlet pipeline 9. Achieve zero waste discharge of materials in the pre-polycondensation reactor shell 1.

[0062] Example 2: Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Fig. 9 , Fig.10 , Fig.11 , Fig.12 , Fig.13 , Fig.14As shown, a zero-waste upflow precondensation reactor is provided, wherein the zero-waste upflow precondensation reactor adopts a vertical, jacketed structure, and comprises: a precondensation reactor shell 1 and a tower plate structure 2 installed inside the reactor shell 1, wherein a plurality of tower plate structures 2 are provided, and the plurality of tower plate structures 2 are stacked in a vertical direction. The pre-condensation reactor shell 1 adopts a jacket structure, including the tower bottom head 1-1, the tower shell cylinder 1-2, the cone 1-3, the tower shell cylinder expansion section 1-4, the shell flange 1-5 and the tower top head 1-6, which are connected in sequence from bottom to top to form the pre-condensation reactor shell 1, and the reactor shell 1 is provided with internal parts, which include a plurality of tower plate structures 2 arranged inside the tower shell cylinder 1 and a bubble cap (baffle type demister) 3 installed at the upper end of the tower plate structure, wherein the tower plate structure includes an edge riser tower plate 2-1 and a center riser tower plate 2-2, wherein the edge riser tower plate 2-1 is arranged at the bottom and the center riser tower plate 2-2 is arranged at the top. The tower plate structure 2 is supported and fixed on the support inside the tower shell cylinder 1-2 by a distance tube 4 and a tie rod 5, and the gap between the center riser tower plate 2-2 and the tower shell cylinder 1-2 is sealed by a segmented, detachable sealing component 6.

[0063] like Figure 1 As shown, the pre-polycondensation reactor shell 1 includes the tower bottom head 1-1, the tower shell cylinder 1-2, the cone 1-3, the tower shell cylinder expansion section 1-4, the shell flange 1-5 and the tower shell head 1-6, which are sequentially connected from bottom to top to form the pre-polycondensation reactor shell 1. The bottom of the tower bottom head 1-1 is provided with a material inlet 1-7, the bottom of the cone 1-3 is provided with a material outlet 1-8, and the top of the tower shell head 1-6 is provided with a gas phase outlet 1-9.

[0064] The internal parts include a plurality of tray structures 2 arranged inside the tower shell cylinder 1-2 and the bubble cap (baffle type demister) 3 installed at the upper end of the tray structure 2, wherein the tray structure 2 includes the edge riser tray 2-1 and the center riser tray 2-2 alternately connected to form the tray structure 2.

[0065] like Figure 2 , Figure 3 and Figure 4As shown, the edge riser tray 2-1 is a monolithic, annular structure, and the edge riser tray comprises an edge tray plate 2-1-1 and a liquid distribution ring plate 2-1-5. A center hole 2-1-2 is opened at the center position of the edge tray plate 2-1-1, and an edge cap 2-1-3 is provided on one side of the center hole 2-1-2 of the edge tray plate 2-1-1. The edge cap 2-1-3 is cylindrical, and the edge cap 2-1-3 is provided with a large-diameter arc top plate. The outer diameter of the edge cap 2-1-3 is the same as the outer diameter of the riser tube 2-2-3 of the center riser tray 2-2. When assembled, the edge cap 2-1-3 side faces upward. A ring plate 2-1-4 is provided on the side of the edge of the edge tower plate 2-1-1 opposite to the edge cap cover 2-1-3, and a liquid distribution ring plate 2-1-5 is provided on the same side of the edge of the edge tower plate 2-1-1 as the edge cap cover 2-1-3. The ring plate 2-1-4 and the liquid distribution ring plate 2-1-5 are both vertically arranged with the edge tower plate 2-1-1, and circular holes are evenly arranged through the middle of the liquid distribution ring plate 2-1-5. One end of the liquid distribution ring plate 2-1-5 is smooth, and the end of the liquid distribution ring plate 2-1-5 close to the edge tower plate 2-1-1 is evenly provided with first liquid leakage tooth gaps. The first liquid leakage tooth gap in the present embodiment is a trapezoidal shape with a narrow upper end and a wide lower end, and the tooth top at the edge of the liquid distribution ring plate 2-1-5 is welded to the edge plate of the tower plate 2-1-1.

[0066] The characteristics are: the whole tower plate is easy to install, no splicing and adjustment are required during the assembly process, and the assembly workload is small. The liquid material can enter and exit the edge riser pipe 2-2-3 through the circular hole and the first liquid leakage tooth gap on the liquid distribution ring plate 2-1-5, ensuring that the material is evenly distributed on the edge tower plate 2-1-1, and the gas is always evenly distributed in the liquid material in the form of small bubbles. When shutting down, all the materials on the tower plate can be reversely discharged through the first liquid leakage tooth gap of the liquid distribution ring plate 2-1-5.

[0067] like Figure 5 and Figure 6 As shown, the central liquid riser plate 2-2 is a monolithic, annular structure, a liquid rise port 2-2-2 is opened at the central position of the plate plate 2-2-1, the liquid riser 2-2-3 and the central cap cover 2-2-4 are respectively provided on both sides of the liquid rise port 2-2-2, a stiffening ring plate 2-2-5 is provided on the edge of the central plate plate 2-2-1, the stiffening ring plate 2-2-5 is vertically arranged with the central plate plate 2-2-1, the outer ring of the top of the stiffening ring plate 2-2-5 on the same side of the central cap cover 2-2-4 is provided with the sealing assembly fixing ring 2-2-6, the sealing assembly fixing ring 2-2-6 is vertically arranged with the stiffening ring plate 2-2-5 and parallel with the plate plate 2-2-1, and a plurality of through holes are evenly distributed on the sealing assembly fixing ring 2-2-6.

[0068] like Fig. 9 and Fig.10 As shown, the structure of this embodiment is different from that of embodiment 1 in that the central cap 2-2-4 includes a cylinder 2-2-4-1 and a top cover 2-2-4-2, the top cover 2-2-4-2 is welded to one end of the cylinder 2-2-4-1, the top cover 2-2-4-2 is a large diameter arc plate, the top cover 2-2-4-2 is provided with a certain number of circular liquid distribution holes, the cylinder 2-2-4-1 is close to the top cover 2-2-4 -2 has many small holes or gaps on its wall, and the wall of the other end of the cylinder 2-2-4-1 is a continuous arc edge. The cylinder 2-2-4 is welded to the center tray plate 2-1-1 by ribs in its circumferential direction, so that a gap of a certain height (about 20mm) is left between the bottom end of the smooth edge of the cylinder 2-2-4-1 and the tray plate surface 2-2-1, which is called the bottom gap 2-2-7. The bottom gap 2-2-7 is the second liquid leakage tooth gap. When assembled, the center cap 2-2-4 side faces upward.

[0069] The characteristic is that the liquid can enter and exit the central cap cover 2-2-4 through the opening on the central cap cover 2-2-4 and the second liquid leakage tooth gap (bottom gap), ensuring that the liquid material can be three-dimensionally, omnidirectionally and evenly distributed on the central tray plate 2-2-1, and the gas is always evenly distributed in the liquid material in the form of small bubbles. When the machine is shut down, all the materials on the central riser tray 2-2 can be discharged in the reverse direction through the second liquid leakage tooth gap.

[0070] like Fig.11 and Fig.12 As shown, the bubble cap (baffle type demister) 3 comprises a bubble cap top cover 3-1, a bubble cap cylinder 3-2 and a corrugated plate 3-3. The bubble cap top cover 3-1 is a large diameter arc plate. The bubble cap top cover 3-1 is welded and fixed to one end of the bubble cap cylinder 3-2. The other end of the bubble cap cylinder 3-2 is welded with a plurality of corrugated plates 3-3 fixed at a certain spacing and arrangement.

[0071] like Fig.13As shown, the gap between the central liquid riser tray 2-2 and the tower shell cylinder 1-2 is sealed by the segmented, detachable sealing assembly seal 6, and the sealing assembly includes a packing support ring 6-1, a retaining ring 6-2, a sealing packing 6-3, a pressure ring 6-4, a pressure plate 6-5 and connecting screws. The connecting screws in this embodiment are hexagon socket screws 6-6. The packing support ring 6-1 is a ring plate with a width of about 50 mm. There are several through holes evenly distributed on the circumference close to the inner circle of the packing support ring 6-1. The through holes on the packing support ring 6-1 correspond to the threaded holes on the sealing assembly fixing ring 2-2-6 one by one. The packing support ring 6-1 is fixed to the sealing assembly fixing ring 2-2-6 by the hexagon socket screw 6-6. The retaining ring 6-2 is fixed to the annular surface of the packing support ring 6-1 close to the outer circle by welding. The sealing packing 6-3 is installed between the tower shell cylinder 1-2 and the retaining ring 6-2. On the packing support ring 6-1, the sealing packing 6-3 is a carbon fiber packing, the pressure ring 6-4 is installed on the sealing packing 6-3 between the tower shell cylinder 1-2 and the retaining ring 6-2, the pressure ring 6-4 is an open circular ring, the pressure plate 6-5 is an L-shaped angle steel with a width of about 20 mm, the horizontal section of the pressure plate 6-5 is pressed on the top of the pressure ring 6-4, and the vertical section of the pressure plate 6-5 is supported on the upper end surface of the packing support ring 6-1, and the hexagon socket screw 6-6 passes through the pressure plate 6-5 and is fixed on the packing support ring surface 6-1 and is tightened by the hexagon socket screw 6-6.

[0072] The characteristics are: the diameter of the central liquid riser tower plate 2-2 can be appropriately reduced to facilitate the lifting and adjustment of the central liquid riser tower plate 2-2 inside the tower shell cylinder 1-2; the sealing component adopts a segmented detachable structure, and multiple sealing fillers 6-3 can be installed to ensure the sealing performance, prevent the material from axially mixing and affecting the product quality, and facilitate the removal, installation and replacement of the sealing component.

[0073] The working principle of the tower plate structure is as follows: the material flows into the tower shell cylinder 1-2 from the material inlet 1-7, and then the material flows into the channel between the outer wall of the ring plate 2-1-4 and the inner wall of the tower shell cylinder 1-2 from the gap at the lower end of the ring plate 2-1-4, flows upward along the channel between the outer wall of the ring plate 2-1-4 and the inner wall of the tower shell cylinder 1-2, and then flows into the upper end of the edge tower plate 2-1-1 from the circular hole on the liquid distribution ring plate 2-1-5, and then the material converges toward the center, and then flows through the liquid riser port 2-2-2 from the gap between the edge cap cover 2-1-3 and the liquid riser 2-2-3, and then flows out from the circular hole on the center cap cover 2-2-4, and the above process is repeated until it flows into the bubble cap 3.

[0074] When the material needs to be discharged, the material is on the central tower plate 2-2-1, and the material then flows downward from the bottom gap 2-2-7 on the central cap cover 2-2-4 through the liquid riser 2-2-2, and then flows from the gap between the top of the edge cap cover 2-1-3 and the liquid riser 2-2-3 to the top of the edge tower plate 2-1-1, and then flows from the first liquid leakage tooth gap on the side wall of the liquid distribution ring plate 2-1-5 into the channel between the outer wall of the ring plate 2-1-4 and the inner wall of the tower shell cylinder 1-2, and then flows into the central tower plate 2-2-1, and the above process is repeated until it flows out from the material inlet 1-7 at the bottom of the tower shell cylinder 1-2.

[0075] In the present invention, by setting the first liquid leakage tooth gap and the second liquid leakage tooth gap, the material can flow out completely from top to bottom. When the machine is shut down, all the materials on the tray can be discharged in reverse through the cap cover tooth gap, so there is no need to inject a large amount of EG to dilute and decompose the materials before they can be discharged cleanly, which has the characteristics of convenient operation and safety. In addition, in the present invention, the flow direction of the material is to flow from the circular hole on the side wall of the liquid distribution ring plate 2-1-5 to the center position, and then flow from the center position of the edge tray plate 2-1-1 into the center cap cover 2-2-4, and then flow from the circular hole on the center cap cover 2-2-4 to the surroundings, so that the material flows in the direction of "from the surroundings to the center" and "from the center to the surroundings", thereby ensuring that the liquid material can be three-dimensionally, comprehensively and evenly distributed on the tray plate, and the gas is always evenly distributed in the liquid material in the form of small bubbles, so that the reaction can be more sufficient.

[0076] The working principle of this embodiment is as follows: like Fig.14 As shown, a loop pipeline is provided between the material inlet 1-7 located at the bottom of the precondensation reactor and the material outlet 1-8 located at the upper part of the precondensation reactor.

[0077] The loop pipeline includes: a circulation pump 7, an inlet pipeline 8 of the circulation pump 7, an inlet pipeline three-way valve 10, an outlet pipeline 9 of the circulation pump 7 and an outlet pipeline three-way valve 11.

[0078] When the pre-polycondensation reactor is in operation, the inlet pipeline three-way valve 10 and the outlet pipeline three-way valve 11 of the loop pipeline are in a closed state. The material enters the interior of the tower shell cylinder 1-2 from the material inlet 1-7 at the bottom to undergo polycondensation reaction. When the material index is qualified, the material flows out (or is pumped) from the material outlet 1-8 located at the upper part of the pre-polycondensation reactor shell 1 to the final polycondensation reactor 12 (next process).

[0079] When the upflow precondensation reactor with zero material waste discharge is shut down, after the precondensation reactor shell stops feeding, when no material can be detected on the top central riser tray 2-2, the inlet pipeline three-way valve 10 at the material inlet 1-7 of the precondensation reactor and the pipeline outlet three-way valve 11 at the material outlet 1-8 are closed, the inlet pipeline three-way valve 10 and the outlet pipeline three-way valve 11 of the loop pipeline are opened, a closed circulation loop is formed between the precondensation reactor and the loop pipeline, the circulation pump 7 is started, and the material flows out from the material inlet 1-7 located at the bottom of the precondensation reactor and enters the inlet pipeline 8 of the circulation pump 7. After the material is pressurized by the circulation pump 7, the material flows through the outlet pipeline 9 and enters the interior of the precondensation reactor shell 1 from the material outlet 1-8 located at the upper part of the precondensation reactor shell 1. The material continues to react with polycondensation. After a period of time, the material is pressurized by the circulation pump 7, and the material no longer returns to the precondensation reactor 1 but is sent to the final polycondensation reactor 12 (next process). The inlet pipeline three-way valve 10 and the outlet pipeline three-way valve 11 at both ends of the loop pipeline are closed to drain the materials in the inlet pipeline 8, the circulation pump 7 and the outlet pipeline 9, so as to achieve zero waste discharge of the pre-polycondensation reactor.

[0080] The above-described embodiments are only preferred solutions of the present invention and are not intended to limit the present invention in any form. Other variations and modifications are possible without exceeding the technical solutions described in the claims.

Claims

1. A zero-waste upflow precondensation reactor, characterized in that: include: The pre-polycondensation reactor shell has a material inlet and a material outlet at the bottom and top respectively; A plurality of tray structures are stacked and arranged on the shell of a precondensation reactor, the tray structure comprises an edge riser tray and a center riser tray arranged in sequence along the vertical direction; the edge riser tray comprises an edge tray plate and a liquid distribution ring plate, the liquid distribution ring plate is arranged along the circumferential direction of the upper end surface of the edge tray plate, and the edge of the liquid distribution ring plate close to the edge tray plate is provided with a first liquid leakage tooth gap; the center riser tray comprises a center tray plate and a center cap cover, and the edge of the center cap cover close to the center tray plate is provided with a second liquid leakage tooth gap; A sealing component is arranged between the circumferential direction of the central liquid riser tray structure and the shell of the pre-polycondensation reactor.

2. The zero-waste upflow precondensation reactor according to claim 1, characterized in that: A stiffening ring plate is arranged in the circumferential direction of the upper end surface of the central tower plate, a sealing assembly fixing ring is arranged in the circumferential direction of the outer side wall of the stiffening ring plate, and the sealing assembly is arranged on the sealing assembly fixing ring.

3. The zero-waste upflow precondensation reactor according to claim 1, characterized in that: The sealing assembly comprises a packing support ring, a sealing packing and a pressing assembly. A retaining ring is fixedly arranged on the packing support ring, and the sealing packing is arranged between the retaining ring and the precondensation reactor shell; the pressing assembly fixes the sealing packing on the support ring.

4. The zero-waste upflow precondensation reactor according to claim 3, characterized in that: The clamping assembly includes a pressure plate, a pressure ring and connecting screws; the cross-section of the pressure plate is L-shaped, the vertical section of the pressure plate abuts against the packing support ring, and the pressure ring is arranged on the upper end surface of the sealing packing; the connecting screw passes through the horizontal section of the pressure plate and is connected to the packing support ring, and the horizontal section of the pressure plate presses the pressure ring onto the sealing packing.

5. The zero-waste upflow precondensation reactor according to any one of claims 1 to 4, characterized in that: An edge cap is arranged on the end surface of the edge tray plate close to the center tray plate, and a riser corresponding to the edge cap is arranged on the end surface of the center tray plate close to the edge tray plate, with a gap arranged between the riser and the edge cap.

6. The zero-waste upflow precondensation reactor according to any one of claims 1 to 4, characterized in that: The central cap comprises a cylinder and a top cover arranged above the cylinder, and circular holes are evenly distributed on the top cover and the cylinder; a liquid rising port is arranged at the center of the central tower plate, the cylinder is arranged on the upper end surface of the liquid rising port, and the second liquid leakage tooth gap is arranged at the edge of the cylinder close to the liquid rising port.

7. The zero-waste upflow precondensation reactor according to claim 1, characterized in that: Its characteristics are: An annular plate is arranged in the circumferential direction of the other side of the edge tray plate relative to the edge riser plate.

8. The zero-waste upflow precondensation reactor according to claim 1, characterized in that: The first liquid leakage tooth gap and the second liquid leakage tooth gap are both trapezoidal.

9. The zero-waste upflow precondensation reactor according to claim 1 or 2 or 3 or 4 or 7 or 8, characterized in that: A bubble cap is arranged on the top of a plurality of tower tray structures. The bubble cap comprises a bubble cap top cover, a bubble cap cylinder and a corrugated plate.

10. The zero-waste upflow precondensation reactor according to claim 1 or 2 or 3 or 4 or 7 or 8, characterized in that: The precondensation reactor shell includes a tower shell cylinder and a tower shell cylinder expansion section, which are connected by a cone; a tower top head is arranged at the top of the tower shell cylinder expansion section; a tower bottom head is arranged at the bottom of the tower shell cylinder, and a material inlet is arranged at the bottom of the tower bottom head.

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