Forced circulation vertical polyester reaction device
Through the introduction of mandatory circulation and condenser in the polyester reaction device, the problem of high viscosity melt material is solved, and high -efficiency flow and departure are achieved, avoiding heat -degradation, and improving product quality.
Patent Information
- Application Number
- CN202421203419.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-29
- Publication Date
- 2025-01-28
- Estimated Expiration
- 2034-05-29
AI Technical Summary
During the synthesis of polyester materials, it is difficult to devolatilize high viscosity melt materials, resulting in difficulty in material flow and frequent thermal degradation reactions, affecting product indicators.
Design a compulsory circulating vertical polyester reaction device, including reactors, melt gear pumps and condenser. The high viscosity melt material is mandatory through the melt gear pump, and small molecular alcohols that are removed from the condenser to form a small molecular alcohol to form formed Materials continuously circulate to avoid local heating.
The efficient material flow has been achieved, the effect is promoted, the thermal degradation reaction is avoided, and the high molecular weight is obtained at the same time as the product indicators are excellent.
Smart Images
Figure CN222401479U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of chemical reactors, in particular to a forced circulation vertical polyester reaction device. Background Art
[0002] During the synthesis of polyester materials, as the molecular weight increases, the viscosity of the melt material gradually increases, making it difficult to devolatilize small molecule alcohols. In ordinary vertical reactors, the stirring structure in the reactor is usually changed to increase the devolatilization rate and further increase the molecular weight, or the reaction time is further extended to promote devolatilization and increase the molecular weight. However, whether it is changing the stirring structure or increasing the reaction time, it is difficult to avoid the difficulty of material flow in the reactor, which leads to the inability to devolatilize the material and further thermal degradation reaction (thermal degradation will cause the product to turn yellow and the end carboxyl group to increase), which seriously affects the product indicators (end carboxyl group and hue).
[0003] For this purpose, a forced circulation vertical polyester reaction device is provided. The polyester reactor manufactured by the utility model can effectively force the high-viscosity melt material in the reactor to flow, promote the devolatilization effect in the reaction process, and at the same time avoid local heating of the melt to a greater extent, so as to obtain a higher molecular weight and excellent product indicators. Utility Model Content
[0004] The purpose of the utility model is to provide a forced circulation vertical polyester reaction device to solve the problems raised by the above background technology in view of the defects of the prior art.
[0005] To achieve the above object, the utility model provides the following technical solution: a forced circulation vertical polyester reaction device, comprising a reactor, a melt gear pump, and a condenser, wherein a first pipeline is connected to the bottom of the reactor, one end of the first pipeline is connected to the melt gear pump, a second pipeline is connected to the discharge port of the melt gear pump, one end of the second pipeline is connected to the third pipeline and the fourth pipeline through a three-way valve, and one end of the fourth pipeline is connected to the middle of the reactor;
[0006] A fifth pipeline is connected to one side of the top of the reactor, one end of the fifth pipeline is connected to a condenser, and a sixth pipeline is connected to the top of the condenser.
[0007] As a preferred technical solution of the utility model, the bottom of the reactor is connected to the first pipeline through a reactor bottom valve.
[0008] As a preferred technical solution of the utility model, a stirring motor is installed on the top of the reaction kettle, and a stirrer is installed inside the reaction kettle.
[0009] As a preferred technical solution of the utility model, the agitator is fixedly connected to the rotating shaft of the agitator motor through a coupling.
[0010] As a preferred technical solution of the utility model, the agitator is an anchor-type and double-screw composite agitator.
[0011] As a preferred technical solution of the utility model, the fourth pipeline is sealed and connected to the side of the reactor.
[0012] Compared with the prior art, the beneficial effects of the utility model are:
[0013] The polyester reactor produced by the utility model can effectively force the high-viscosity melt material in the reactor to flow, promote the devolatilization effect in the reaction process, and at the same time avoid local heating of the melt to a greater extent, so as to obtain a higher molecular weight and excellent product indicators;
[0014] The polyester reaction device provided by the utility model can efficiently complete devolatilization, and at the same time, increase the molecular weight and avoid thermal degradation reaction caused by heating of local materials. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a schematic diagram of the structure of the utility model;
[0016] In the figure: 1. stirring motor; 2. reactor; 3. stirrer; 4. reactor bottom valve; 5. first pipeline; 6. melt gear pump; 7. second pipeline; 8. third pipeline; 9. three-way valve; 10. fourth pipeline; 11. fifth pipeline; 12. condenser; 13. sixth pipeline. DETAILED DESCRIPTION
[0017] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.
[0018] Embodiment: A forced circulation vertical polyester reaction device comprises a reactor 2, a melt gear pump 6, and a condenser 12. The bottom of the reactor 2 is connected to a first pipeline 5, one end of the first pipeline 5 is connected to the melt gear pump 6, the discharge port of the melt gear pump 6 is connected to a second pipeline 7, one end of the second pipeline 7 is connected to a third pipeline 8 and a fourth pipeline 10 through a three-way valve 9, and one end of the fourth pipeline 10 is connected to the middle of the reactor 2;
[0019] A fifth pipeline 11 is connected to one side of the top of the reactor 2 , one end of the fifth pipeline 11 is connected to a condenser 12 , and a sixth pipeline 13 is connected to the top of the condenser 12 .
[0020] The bottom of the reactor 2 is connected to the first pipeline 5 through the reactor bottom valve 4 .
[0021] A stirring motor 1 is installed on the top of the reaction kettle 2 , and a stirrer 3 is installed inside the reaction kettle 2 .
[0022] The stirrer 3 is fixedly connected to the rotating shaft of the stirring motor 1 through a coupling.
[0023] The agitator 3 is an anchor-type and double-screw composite agitator.
[0024] The fourth pipeline 10 is sealed and connected to the side of the reaction kettle 2 .
[0025] Working principle: A forced circulation vertical polyester reaction device comprises a stirring motor 1, a reactor 2, an agitator 3, a bottom valve 4 of the reactor, a first pipeline 5, a melt gear pump 6, a second pipeline 7, a third pipeline 8, a three-way valve 9, a fourth pipeline 10, a fifth pipeline 11, a condenser 12 and a sixth pipeline 13. The esterified product obtained by the reaction of diol and dibasic acid is added into the reactor 2. After the reaction temperature is reached, the stirring motor 1 is turned on. The stirring motor 1 drives the agitator 3 to make the material dispersed evenly, and then the bottom valve 4 of the reactor is opened. The material enters the melt gear pump 6 through the first pipeline 5 and returns to the reactor 2 through the second pipeline 7, the three-way valve 9 and the fourth pipeline 10, forming a continuous circulation of the material. The small molecular alcohol released during the reaction enters the condenser 12 through the fifth pipeline 11 for condensation and is discharged from the device through the sixth pipeline 13. After the reaction is completed, the three-way valve 9 is rotated to connect the second pipeline 7 with the third pipeline 8. After the material is discharged from the device, it is cooled and pelletized to obtain a polyester product.
[0026] The polyester reactor can effectively force the high-viscosity melt material in the reactor to flow, which promotes the devolatilization effect during the reaction process. At the same time, it can avoid local heating of the melt to a greater extent, and can obtain higher molecular weight while having excellent product indicators.
[0027] The above embodiments only express the implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model.
Claims
1. A forced circulation vertical polyester reaction device, comprising a reaction kettle (2), a melt gear pump (6), and a condenser (12), characterized in that: The bottom of the reaction kettle (2) is connected to a first pipeline (5), one end of the first pipeline (5) is connected to a melt gear pump (6), the discharge port of the melt gear pump (6) is connected to a second pipeline (7), one end of the second pipeline (7) is connected to a third pipeline (8) and a fourth pipeline (10) via a three-way valve (9), and one end of the fourth pipeline (10) is connected to the middle of the reaction kettle (2); A fifth pipe (11) is connected to one side of the top of the reactor (2), one end of the fifth pipe (11) is connected to a condenser (12), and a sixth pipe (13) is connected to the top of the condenser (12).
2. A forced circulation vertical polyester reaction device according to claim 1, characterized in that: The bottom of the reactor (2) is connected to the first pipeline (5) via a reactor bottom valve (4).
3. The forced circulation vertical polyester reaction device according to claim 1, characterized in that: A stirring motor (1) is installed on the top of the reaction kettle (2), and a stirrer (3) is installed inside the reaction kettle (2).
4. A forced circulation vertical polyester reaction device according to claim 3, characterized in that: The stirrer (3) is fixedly connected to the rotating shaft of the stirring motor (1) via a coupling.
5. A forced circulation vertical polyester reaction device according to claim 4, characterized in that: The agitator (3) is an anchor-type and double-screw composite agitator.
6. A forced circulation vertical polyester reaction device according to claim 1, characterized in that: The fourth pipeline (10) is sealed and connected to the side of the reaction kettle (2).