Esterification feeding distributor
By designing an esterification feed distributor, the problems of liquid additives accumulating and self-polymerizing in the esterification reactor were solved, achieving uniform dispersion of liquid additives and improving the reaction efficiency of polyester production.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-01
- Publication Date
- 2026-03-03
AI Technical Summary
During polyester production, liquid additives may accumulate in the esterification reactor and undergo self-polymerization, resulting in ineffective dispersion and affecting the reaction effect.
Design an esterification feed distributor, including a liquid distributor and a guide pipe, to disperse liquid additives into the esterification reactor through the guide pipe, and to set an annular shell and a liquid outlet in the liquid distributor to achieve uniform dispersion, and to have a certain strength to resist the pressure inside the reactor.
This method achieves uniform dispersion of liquid additives in the esterification reactor, avoids self-aggregation, and improves reaction efficiency and effectiveness.
Smart Images
Figure CN223959613U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of polyester chip production technology, specifically an esterification feeder. Background Technology
[0002] Polyester, also known as polyethylene terephthalate, is a thermoplastic polymer formed by the esterification and polycondensation reactions of terephthalic acid and ethylene glycol. During polyester production, a large amount of different types of liquid additives are added during the primary and secondary esterification reactions. These liquid additives are generally added directly into a packed tank, where they accumulate and are then stirred evenly by a stirring paddle inside the tank. This stirring and dispersion requires a certain amount of time. Some of these liquid additives may undergo self-polymerization under high temperatures for an extended period. Once self-polymerization occurs, the additive will no longer function as intended.
[0003] To address the aforementioned issues, an esterification feed distributor is provided to achieve the dispersed addition of liquid additives within the esterification reactor. Utility Model Content
[0004] This invention provides an esterification feed distributor for dispersing and adding liquid additives into the esterification reactor.
[0005] The technical solution adopted in this utility model is:
[0006] An esterification feed distributor includes an esterification reactor, a feed tank with a pre-reserved opening at the top of the esterification reactor, and a liquid distributor positioned above and inside the esterification reactor. The pre-reserved opening at the top of the esterification reactor extends into the reactor to form a guide pipe. The liquid distributor includes a first annular shell and a second annular shell positioned below the inner side of the first annular shell. The tops of the first and second annular shells are open. The outlet of the guide pipe is located above the first annular shell. The first and second annular shells share a common sidewall, and the top of the common sidewall is lower than the top of the outer sidewall of the first annular shell and higher than the top of the inner sidewall of the second annular shell. The bottoms of the first and second annular shells are respectively provided with a plurality of first liquid outlets, and the common sidewall on the first annular shell is uniformly provided with a plurality of guide ports.
[0007] Preferably, the inner wall of the second annular shell is inclined toward the end away from the common side wall, and a plurality of second liquid outlets are provided on the inner wall of the second annular shell.
[0008] Preferably, an annular partition plate is vertically arranged downward at the junction of the bottom outer side of the second annular shell and its inner side wall, and a first reinforcing plate is provided at intervals on the bottom surface of the second annular shell located on the outer side of the annular partition plate.
[0009] Preferably, a plurality of reinforcing rods are distributed on the top of the outer side wall and the top of the common side wall of the first annular shell, a reinforcing ring is provided at the junction of the bottom outer side of the first annular shell and the common side wall, and a plurality of second reinforcing plates are provided at intervals on the bottom surface of the first annular shell located outside the reinforcing ring.
[0010] Preferably, support rods are spaced apart on the outer side wall of the first annular shell, and mounting bases are provided at the lower ends of the support rods. L-shaped fixing bases that match the mounting bases are spaced apart inside the esterification reactor. The liquid distributor is installed inside the esterification reactor through the cooperation of the mounting bases and the L-shaped fixing bases.
[0011] Preferably, the first liquid outlet is composed of a frustum-shaped through hole and a circular through hole arranged from top to bottom and connected together, and the diameter of the circular through hole is equal to the minimum diameter of the frustum-shaped through hole.
[0012] The beneficial effects of this utility model are as follows: This esterification feed distributor arranges the liquid distributor inside the esterification kettle, corresponding to the feed guide pipe, to realize the dispersed addition of liquid additives; the liquid distributor adopts a reasonable design, and a certain gap is reserved between it and the inside of the esterification kettle to facilitate the passage of water vapor, and it also has a certain strength so that it will not deform under the required pressure. Attached Figure Description
[0013] Figure 1 This is a cross-sectional view of the present invention without the reinforcing rod.
[0014] Figure 2 yes Figure 1 Enlarged view of part A in the image.
[0015] Figure 3 It is a 3D view of a liquid distributor with reinforcing bars.
[0016] Figure 4 yes Figure 3 A half-section perspective view with the reinforcing rods removed.
[0017] Legend: 1. Esterification vessel; 2. Feeding tank; 3. Liquid distributor; 4. Guide pipe; 5. First liquid outlet; 6. Guide port; 7. Second liquid outlet; 8. Annular partition plate; 9. First reinforcing plate; 10. Reinforcing rod; 11. Reinforcing ring; 12. Second reinforcing plate; 13. Support rod; 14. Mounting base; 15. L-shaped fixing base; 31. First annular shell; 32. Second annular shell; 33. Common side wall. Detailed Implementation
[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.
[0019] Due to production requirements, the solution volume in the esterification reactor is currently maintained at approximately 70%, which limits the top space inside the reactor. During the esterification reaction, the generated water needs to be fractionated from the top through a distillation column, resulting in pressure inside the reactor. Therefore, when designing the distributor, a certain gap must be reserved between the liquid distributor and the esterification reactor to facilitate the passage of water vapor, and it should also possess sufficient strength to prevent deformation under the required pressure. Based on these requirements, this invention provides an esterification feed distributor, which arranges the liquid distributor inside the esterification reactor, corresponding to the feed guide pipe, to achieve the dispersed addition of liquid additives.
[0020] according to Figures 1 to 4 As shown, this esterification feed distributor includes an esterification reactor 1, a feed tank 2 with a pre-reserved opening at the top of the esterification reactor 1, and a liquid distributor 3 located inside and above the esterification reactor 1. The feed tank 2 is fixed to the pre-reserved opening at the top of the esterification reactor by a flange, and valves are arranged on its inlet and outlet pipes. The pre-reserved opening at the top of the esterification reactor extends into the interior of the esterification reactor to form a guide pipe 4. The liquid distributor 3 includes a first annular shell 31 and a second annular shell 32 located below the inner side of the first annular shell 31. The top openings of the first annular shell 31 and the second annular shell 32 are open. The outlet of the guide pipe 4 is located above the first annular shell 31. The first annular shell 31 and the second annular shell 32 have a common sidewall 33, and the top of the common sidewall 33 is lower than the top of the outer sidewall of the first annular shell and higher than the top of the inner sidewall of the second annular shell. The bottoms of the first annular shell 31 and the second annular shell 32 are respectively provided with a plurality of first liquid outlets 5, and the common sidewall 33 on the first annular shell is provided with a plurality of guide ports 6 evenly distributed. The guide port on the common sidewall facilitates the introduction of liquid additives from the first annular shell into the second annular shell. The design of the height difference at the top of the common sidewall allows liquid additives to flow into the second annular shell from the top of the common sidewall, thus accelerating the flow rate.
[0021] To accelerate the flow rate of the liquid additive from the first outlet, the first outlet 5 is composed of a frustum-shaped through hole and a circular through hole arranged from top to bottom and connected together, and the diameter of the circular through hole is equal to the minimum diameter of the frustum-shaped through hole.
[0022] In this embodiment, the liquid distributor adopts a relatively small volume design to minimize the vertical and horizontal space it occupies, facilitating its subsequent arrangement within the esterification reactor. It also allows sufficient space between itself and the inner walls and top of the esterification reactor to facilitate the passage of water vapor, and maintains a considerable distance from the liquid inside the reactor, which is quite reasonable. Furthermore, the stepped design of the first and second annular shells divides the bottom surface into two sections. Compared to using only one large annular shell, this reduces the pressure on each bottom surface and also guides water vapor through both sides of the liquid distributor.
[0023] In use, first close the outlet valve of the feeding tank and open its inlet valve. Add the liquid additive to the feeding tank until the liquid level is slightly higher than the valve on the inlet pipe, ensuring that air is expelled from the feeding tank. Then close the inlet valve and open the outlet valve to add the liquid additive to the esterification reactor. Repeat the above steps until all the liquid additive has been added. Under the action of the guide pipe, the liquid additive enters the interior of the first annular shell and diffuses in a ring. At the same time, it is drawn out from the first outlet at the bottom of the first annular shell. Although the outflow through the first outlet of the first annular shell is relatively fast, when a large amount is added, there may be situations where the first batch of liquid additive has not been fully dispersed before the second and third batches of additive have been injected. In this case, the liquid additive will flow out from the guide port on the common side wall. If there is too much, it may also overflow from the top of the common side wall and enter the second annular shell, flowing out from the first outlet at the bottom of the second annular shell.
[0024] Considering the possibility of adding large quantities of liquid additives, in order to increase the capacity and speed up the flow rate, the inner wall of the second annular shell 32 is inclined toward the end away from the common side wall, and a plurality of second liquid outlets 7 are provided on the inner wall of the second annular shell 32.
[0025] Meanwhile, to prevent the liquid additive discharged from the second outlet from flowing back to the bottom of the second annular shell and reducing the flow rate, an annular partition plate 8 is vertically installed downwards at the junction of the outer bottom of the second annular shell 32 and its inner sidewall. Four first reinforcing plates 9 are evenly distributed on the bottom surface of the second annular shell 32 located on the outer side of the annular partition plate 8. The annular partition plate separates the bottom of the second annular shell from its inner sidewall, preventing backflow. Together with the first reinforcing plates, the annular partition plate enhances the strength of the second annular shell, ensuring it does not deform under the required pressure.
[0026] In addition, in order to strengthen the structural strength of the first annular shell, four reinforcing rods 10 are evenly distributed on the top of the outer side wall of the first annular shell 31 and the top of the common side wall 33. A reinforcing ring 11 is provided at the junction of the bottom outer side of the first annular shell 31 and the common side wall 33. Four second reinforcing plates 12 are evenly distributed on the bottom surface of the first annular shell 31 located outside the reinforcing ring.
[0027] In this embodiment, both the first reinforcing plate 9 and the second reinforcing plate 12 are L-shaped plates. The side of the L-shaped plate that is welded to the bottom surface is relatively narrow. During welding, the first liquid outlet is avoided as much as possible, or the corresponding bottom surface does not have a first liquid outlet. In this embodiment, neither the corresponding first annular shell nor the second annular shell has a first liquid outlet on its bottom surface. Therefore... Figure 1 , Figure 2 The first liquid outlet is not shown in the bottom cross-sectional view of the first annular shell 31 and the second annular shell 32.
[0028] In this embodiment, the liquid distributor is fixed inside the esterification reactor. Specifically, four support rods 13 are spaced apart on the outer wall of the first annular shell 31. The lower end of each support rod 13 is provided with a mounting base 14. L-shaped fixing bases 15 that match the mounting bases 14 are spaced apart inside the esterification reactor 1. The two are fixed by bolts and nuts. The liquid distributor is installed inside the esterification reactor through the cooperation of the mounting bases 14 and the L-shaped fixing bases 15.
[0029] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.
Claims
1. An esterification feeding distributor, comprising an esterification kettle (1), a feeding tank (2) arranged at the top reserved port of the esterification kettle (1), and a liquid distributor (3) arranged above the inside of the esterification kettle, characterized in that: The esterification kettle (1) top reserved mouth extends to the inside of the esterification kettle to form a flow guide pipe (4), the liquid distributor (3) includes a first annular shell (31), a second annular shell (32) arranged below the inside of the first annular shell (31), the top openings of the first annular shell (31) and the second annular shell (32), the outlet of the flow guide pipe (4) is located above the first annular shell (31), the first annular shell (31) and the second annular shell (32) have a shared side wall (33), and the top of the shared side wall (33) is lower than the outside wall top of the first annular shell (31) and higher than the inside wall top of the second annular shell (32); the bottoms of the first annular shell (31) and the second annular shell (32) are respectively provided with a plurality of first liquid outlets (5), and the shared side wall (33) on the first annular shell is uniformly provided with a plurality of flow guide openings (6).
2. An esterification feed distributor according to claim 1, characterized in that: The inside wall of the second annular shell (32) is inclined away from one end of the shared side wall (33), and a plurality of second liquid outlets (7) are arranged on the inside wall of the second annular shell (32).
3. An esterification feed distributor according to claim 1, wherein: The bottom outside of the second annular shell (32) is vertically provided with an annular partition plate (8) at the junction with the inside wall, and the bottom surface of the second annular shell (32) outside the annular partition plate is spaced apart and provided with a first reinforcing plate (9).
4. An esterification feed distributor according to claim 1, wherein: The top of the outside wall of the first annular shell (31) and the top of the shared side wall (33) are provided with a plurality of reinforcing rods (10), the junction of the bottom outside of the first annular shell (31) and the shared side wall (33) is provided with a reinforcing ring (11), and the bottom surface of the first annular shell (31) outside the reinforcing ring is spaced apart and provided with a plurality of second reinforcing plates (12).
5. An esterification feed distributor according to claim 1, wherein: The outside wall of the first annular shell (31) is spaced apart and provided with a support rod (13), the lower end of the support rod (13) is provided with a mounting seat (14), the inside of the esterification kettle (1) is spaced apart and provided with an L-shaped fixing seat (15) matched with the mounting seat (14), and the liquid distributor (3) is arranged in the esterification kettle through the mutual cooperation of the mounting seat and the L-shaped fixing seat.
6. An esterification feed distributor according to claim 1 wherein: The first liquid outlet (5) is composed of a circular truncated cone through hole and a circular through hole arranged from top to bottom and communicated, and the diameter of the circular through hole is equal to the minimum diameter of the circular truncated cone through hole.