A recovery device for dioctyl terephthalate
By optimizing the cooling box and condensation structure, the problem of insufficient octanol condensation was solved, achieving efficient condensation, separation, and recovery of octanol.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANDONG RUNSEN NEW MATERIALS CO LTD
- Filing Date
- 2025-07-18
- Publication Date
- 2026-07-07
AI Technical Summary
In existing dioctyl terephthalate recovery units, octanol condensation is insufficient, resulting in some octanol waste.
A device comprising a cooling box, a cooling plate, a cooling side plate, and a guide plate was designed to improve the condensation effect of octanol by optimizing the gas flow path and condensation structure, and to achieve the separation of octanol from water through a partition and a collection chamber.
It effectively improves the condensation effect and separation and collection efficiency of octanol, and reduces the waste of octanol.
Smart Images
Figure CN224462288U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of chemical equipment technology, and in particular to a recovery device for dioctyl terephthalate. Background Technology
[0002] DOTP, scientifically known as dioctyl terephthalate, is a nearly colorless, low-viscosity liquid. Its production process utilizes direct esterification. Due to the unique physical and chemical properties of the reactant terephthalic acid, it easily sublimates at high temperatures, has a melting point of 425°C, and is insoluble in alcohols and esters. The reaction involves phase changes, and its kinetics differ from typical homogeneous liquid-phase reactions. The esterification reaction of terephthalic acid, carried out under heating in the presence of a catalyst, proceeds in two steps: first, terephthalic acid reacts with octanol to form a monoester; second, the monoester reacts with octanol to produce a mixture of water and excess octanol gas.
[0003] In existing dioctyl terephthalate recovery devices, water and excess octanol are condensed and then separated. Currently, the condensation of water and octanol is mostly carried out through a coil condensation process. However, in this condensation method, the octanol flows relatively fast in the coil, so some octanol cannot be fully cooled and condensed, resulting in some octanol being discharged and wasted. Utility Model Content
[0004] The purpose of this invention is to provide a recovery device for dioctyl terephthalate to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, the present invention provides the following technical solution: a dioctyl terephthalate recovery device, comprising an installation box for installing the dioctyl terephthalate recovery device and a cooling box for octanol condensation, wherein a partition is longitudinally sealed and fixedly installed inside the installation box, and a cooling plate is transversely fixedly installed inside the cooling box, wherein multiple cooling side plates are symmetrically fixedly installed on the side walls of the cooling plate, and the cooling plate and the cooling side plates are hollow and interconnected;
[0006] Guide plates are fixedly installed between two adjacent cooling side plates;
[0007] An air inlet pipe is fixedly installed on the lower side wall of the cooling box, an exhaust pipe is fixedly installed horizontally at the lower end of the interior of the cooling box, and an air outlet pipe is connected to the top surface of the cooling box.
[0008] An inlet pipe is fixedly installed on the upper side wall of the cooling plate and extends to the outside of the cooling box. The end of the inlet pipe extends downward to the lower interior of the mounting box. A circulation pump is fixedly installed on the side wall of the inlet pipe. An outlet pipe is installed on the side of the cooling plate away from the inlet pipe and extends downward to the interior of the mounting box and passes through the partition.
[0009] Preferably, the partition divides the installation box into a separation chamber and a collection chamber, and the ends of both the inlet pipe and the outlet pipe extend into the interior of the separation chamber.
[0010] Preferably, a mounting frame is fixedly installed inside the separation chamber, and a cooler is fixedly installed between the inner walls of the mounting frame.
[0011] Preferably, the sidewalls of the multiple cooling side plates are provided with multiple drainage grooves in the longitudinal direction.
[0012] Preferably, the bottom of the cooling tank is inclined, and a drain pipe is connected to the bottom of the cooling tank.
[0013] Preferably, all of the guide plates are inclined.
[0014] Compared with the prior art, the technical effects and advantages of this utility model are as follows:
[0015] This dioctyl terephthalate recovery device, thanks to the structure of cooling plates, cooling side plates, and multiple guide plates in the cooling box, allows the mixture of water and excess octyl alcohol to be introduced into the interior of the exhaust pipe through the inlet pipe. Furthermore, the exhaust pipe has connecting pipes evenly arranged on its side wall, enabling the mixture to be evenly discharged from the bottom of the cooling box through multiple connecting pipes and to move upwards evenly to contact the cooling plates and multiple cooling side plates. Simultaneously, multiple inclined guide plates continuously change the flow direction of the mixture, effectively slowing down its flow rate within the cooling box and further improving the condensation effect of the mixture.
[0016] The dioctyl terephthalate recovery device benefits from the setting of drainage channels on the side walls of multiple cooling side plates. When the mixed gas of water and excess octanol condenses and adheres to multiple cooling side plates, the water and octanol will be guided to the bottom of the cooling box through multiple drainage channels and flow into the interior of the separation chamber in the installation box through the drain pipe.
[0017] The dioctyl terephthalate recovery device benefits from the partition, separation chamber and collection chamber in the installation box. The condensed water and octyl alcohol are separated into layers in the separation chamber. Then, when the water level in the separation chamber is too high, the octyl alcohol on the water will flow into the interior of the collection chamber through the groove opened above the partition, thus completing the separation and recovery.
[0018] Compared with existing technologies, this dioctyl terephthalate recovery device can effectively improve the condensation effect of water and octanol, thereby further improving the separation and collection effect of water and octanol. Attached Figure Description
[0019] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0020] Figure 1 This is a schematic diagram of the structure of this utility model;
[0021] Figure 2 This is a three-dimensional sectional view of the mounting box in this utility model;
[0022] Figure 3 This is a three-dimensional sectional view of the cooling box in this utility model;
[0023] Figure 4 This is a schematic diagram of the structure of the cooling plate, cooling side plate and multiple guide plates in this utility model.
[0024] Explanation of reference numerals in the attached figures:
[0025] In the diagram: 1. Mounting box; 2. Cooling box; 3. Partition plate; 4. Cooling plate; 5. Cooling side plate; 6. Guide plate; 7. Air inlet pipe; 8. Exhaust pipe; 9. Liquid inlet pipe; 10. Liquid outlet pipe; 11. Circulation pump; 12. Air outlet pipe; 13. Mounting frame; 14. Cooler; 15. Drain pipe; 16. Drainage channel. Detailed Implementation
[0026] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid confusion with the present invention.
[0027] Unless otherwise defined, the directions mentioned herein, such as up, down, left, right, front, back, inside, and outside, are based on the directions shown in the figures of this utility model, and are explained here together.
[0028] The connection method can be any existing method, such as bonding, welding, or bolting, depending on the actual needs.
[0029] like Figures 1 to 4The main structure of the dioctyl terephthalate (DTP) recovery device shown is an installation box 1 for DTP recovery device installation and a cooling box 2 for octanol condensation. The installation box 1 has a partition 3 longitudinally sealed and fixed inside, and a groove is opened on the upper part of the partition 3. The cooling box 2 has a cooling plate 4 transversely fixed inside, and multiple cooling side plates 5 are symmetrically fixed on the side wall of the cooling plate 4. The cooling plate 4 and the cooling side plates 5 are hollow and interconnected. Because the cooling plate 4 and the cooling side plates 5 are hollow and interconnected, the cooling water can fill the interior of the multiple cooling side plates 5 when it enters the cooling plate 4, thereby further improving the contact effect between water and octanol and thus improving the condensation effect. The cooling plate 4 is transversely fixed in the middle of the cooling box 2, and the upper and lower ends of the cooling plate 4 are separated from the inner wall of the cooling box 2. Therefore, there are cavities inside the cooling box 2, which is conducive to the flow of water and excess octanol mixture inside.
[0030] Guide plates 6 are fixedly installed between two adjacent cooling side plates 5. Multiple guide plates 6 are inclined. Multiple inclined guide plates 6 can further increase the residence time of the mixture of water and excess octanol in the cooling box 2, thereby further improving the cooling effect of the mixture of water and excess octanol. At the same time, they can guide the condensed water and excess octanol to flow quickly into the lower end of the interior of the cooling box 2 and into the interior of the separation chamber through the drain pipe 15.
[0031] An air inlet pipe 7 is fixedly installed on the lower side wall of the cooling box 2. An exhaust pipe 8 is fixedly installed horizontally at the lower end of the interior of the cooling box 2. An exhaust pipe 12 is connected to the top surface of the cooling box 2. Connecting pipes are installed on both sides of the exhaust pipe 8, and multiple connecting pipes are evenly arranged. Therefore, the exhaust pipe 8 can evenly release the mixture of water and excess octanol gas inside the lower part of the cooling box 2, so that it moves upward evenly and comes into even contact with the cooling plate 4 and the cooling side plate 5 and condenses.
[0032] An inlet pipe 9 is fixedly installed on the upper side wall of the cooling plate 4 and extends to the outside of the cooling box 2. The end of the inlet pipe 9 extends downward to the lower interior of the mounting box 1. A circulation pump 11 is fixedly installed on the side wall of the inlet pipe 9. An outlet pipe 10 is installed on the side of the cooling plate 4 away from the inlet pipe 9 and extends downward to the interior of the mounting box 1 and through the partition 3. By starting the circulation pump 11, the cooling water pre-filled in the separation chamber is pumped into the interior of the inlet pipe 9 and then into the interior of the cooling plate 4. Subsequently, it flows through the cooling plate 4 into the interior of multiple cooling side plates 5. After circulating in the cooling plate 4 and the cooling side plates 5, the cooling water will flow back into the interior of the separation chamber inside the mounting box 1 through the outlet pipe 10, thereby realizing the recycling of cooling water.
[0033] The partition 3 divides the installation box 1 into a separation chamber and a collection chamber. The ends of the inlet pipe 9 and the outlet pipe 10 extend into the interior of the separation chamber. An installation frame 13 is fixedly installed inside the separation chamber. A cooler 14 is fixedly installed between the inner walls of the installation frame 13. The cooler 14 can effectively cool the cooling water that has been cooled and returned through the outlet pipe 10, thereby further improving the recycling effect of the cooling water.
[0034] Multiple cooling side plates 5 have multiple longitudinally opened drainage grooves 16 on their side walls. The drainage grooves 16 can effectively guide the water and octanol condensed on the cooling side plates 5 to the lower end of the interior of the cooling box 2.
[0035] The bottom of the cooling tank 2 is inclined, and a drain pipe 15 is installed at the bottom of the cooling tank 2. Thanks to the inclined design of the lower part of the interior of the cooling tank 2, the water and octanol cooled at the bottom of the cooling tank 2 can be effectively guided into the drain pipe 15 and then into the interior of the separation chamber.
[0036] Working principle
[0037] In operation, the dioctyl terephthalate (DTP) recovery device first introduces a mixture of water and excess octanol into the exhaust pipe 8 through the inlet pipe 7. The mixture is then discharged into the cooling tank 2 through multiple connecting pipes on the side wall of the exhaust pipe 8. Simultaneously, the circulation pump 11 is activated, drawing water from the separation chamber in the mounting box 1 into the cooling plate 4 through the liquid inlet pipe 9. This ensures that the cooling water fills the cooling plate 4 and the multiple cooling side plates 5. As the mixture of water and excess octanol moves upward, it comes into full contact with the cooling plate 4, the multiple cooling side plates 5, and the multiple guide plates 6 fixedly installed between the side walls of the cooling side plates 5. This effectively condenses the mixture of water and excess octanol. The condensed water and octanol are then discharged into the separation chamber in the mounting box 1 through the drain pipe 15. After the water in the cooling plate 4 and cooling side plates 5 circulates, it is again introduced into the separation chamber through the liquid outlet pipe 10. The cooling water is then cooled again by the cooler 14 installed inside the chamber, achieving recycling.
[0038] It should be noted that, in this document, relational terms such as "one" and "two" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0039] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A recovery device for dioctyl terephthalate, comprising a mounting case (1) for mounting the recovery device for dioctyl terephthalate and a cooling case (2) for condensing octanol, characterized in that: The mounting box (1) is longitudinally sealed and fixedly installed with a partition plate (3), and the cooling box (2) is transversely fixedly installed with a cooling plate (4). Multiple cooling side plates (5) are symmetrically fixedly installed on the side wall of the cooling plate (4), and the cooling plate (4) and the cooling side plates (5) are hollow and connected. Guide plates (6) are fixedly installed between two adjacent cooling side plates (5); An air inlet pipe (7) is fixedly installed on the lower side wall of the cooling box (2), an exhaust pipe (8) is fixedly installed horizontally at the lower end of the interior of the cooling box (2), and an air outlet pipe (12) is connected to the top surface of the cooling box (2). A liquid inlet pipe (9) is fixedly installed on the upper side wall of the cooling plate (4) and extends to the outside of the cooling box (2). The end of the liquid inlet pipe (9) extends downward to the lower inside of the mounting box (1). A circulation pump (11) is fixedly installed on the side wall of the liquid inlet pipe (9). A liquid outlet pipe (10) is installed on the side of the cooling plate (4) away from the liquid inlet pipe (9). The liquid outlet pipe (10) extends downward to the inside of the mounting box (1) and passes through the partition (3).
2. The dioctyl terephthalate recovery device according to claim 1, characterized in that: The partition (3) divides the installation box (1) into a separation chamber and a collection chamber, and the ends of the inlet pipe (9) and the outlet pipe (10) extend into the interior of the separation chamber.
3. The dioctyl terephthalate recovery device according to claim 2, characterized in that: An installation frame (13) is fixedly installed inside the separation chamber, and a cooler (14) is fixedly installed between the inner walls of the installation frame (13).
4. The dioctyl terephthalate recovery device according to claim 1, characterized in that: The sidewalls of the multiple cooling side plates (5) are provided with multiple drainage grooves (16) in the longitudinal direction.
5. The dioctyl terephthalate recovery device according to claim 1, characterized in that: The bottom of the cooling box (2) is inclined, and a drain pipe (15) is connected to the bottom of the cooling box (2).
6. The dioctyl terephthalate recovery device according to claim 1, characterized in that: All of the guide plates (6) are inclined.