Polyester PTT production reaction kettle feeding device
By designing a feeding pipe and a nitrogen system to control the opening and closing of the sealing plate, the problem of limited catalyst addition location was solved, enabling smooth catalyst addition and production stability, and avoiding clogging of the feeding pipe.
Patent Information
- Application Number
- CN202422669175.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-04
- Publication Date
- 2025-12-05
- Estimated Expiration
- 2034-11-04
AI Technical Summary
In existing polyester PTT production, the catalyst addition location is limited, and low flow rate or low pressure can cause material backflow, easily clogging the pipeline and making it difficult to achieve effective addition of auxiliary materials.
A feeding device including a feeding pipe, guide rod, sealing plate, spring and nitrogen system was designed. The opening and closing of the sealing plate is controlled by nitrogen pressure to achieve ultra-small online addition of catalyst, avoid blockage and ensure normal production.
It effectively prevents blockage of the feed pipe, ensures smooth addition of catalyst, improves the practicality and stability of production, and avoids material backflow.
Smart Images
Figure CN223628574U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of polyester production, especially relates to a polyester PTT production reaction kettle feeding device. BACKGROUND
[0002] The production of PTT polyester is to take phthalic acid (PTA) and 1,3-propanediol (PDO) as main raw materials, and add catalysts, matting agents, heat stabilizers, antioxidants and the like, and generate through esterification and polycondensation reaction.
[0003] A catalyst adding valve is arranged at the front positive pressure pipeline of the prepolymerization reaction kettle, and general auxiliary material addition can be carried out at this position, but the existing technology has certain deficiencies, and due to the limitation of the adding position, the original adding point is only suitable for the addition of auxiliary materials with large flow, and if the flow is too small or the inlet pressure is too low, the material may be reversed, thereby blocking the pipeline, and ultimately leading to the failure of auxiliary material addition, and in the production of polyester PTT, the catalyst required is highly active, and the required addition amount is very small, so it is difficult to complete the addition at the original position. SUMMARY
[0004] In view of the above deficiencies, the utility model aims to provide a polyester PTT production reaction kettle feeding device, which ensures that the catalyst will not block the feeding pipe during the adding process, and will not affect the normal production, and prevents the reverse of auxiliary materials.
[0005] In order to achieve the above technical purpose and achieve the above technical requirements, the utility model adopts the technical scheme that:
[0006] A polyester PTT production reaction kettle feeding device, characterized by comprising:
[0007] A reaction kettle, a stirring rod is rotatably penetrated into the top wall in the reaction kettle, and a motor is connected to the top end of the stirring rod and arranged on the reaction kettle;
[0008] A feeding mechanism, comprising a feeding pipe which is vertically arranged on the reaction kettle and has an open bottom, a partition plate is fixedly arranged in the top end of the feeding pipe, a guide rod is coaxially and slidingly penetrated through the partition plate, a sealing plate is connected to the bottom end of the guide rod and used for sealing the open end of the feeding pipe, a limiting plate is connected to the top end of the guide rod, a spring is arranged on the guide rod and mounted between the limiting plate and the partition plate, a nitrogen pipe is communicated with the outer surface of one end of the feeding pipe which is located outside the reaction kettle, a feed tank is arranged on the reaction kettle through a support, a conveying pipe is communicated between the feed tank and the nitrogen pipe, and a variable frequency gear pump is arranged on the feed tank and communicated with the conveying pipe.
[0009] As a preferred technical scheme, the inner diameter of the feeding pipe gradually decreases from top to bottom.
[0010] As a preferred technical scheme, the bottom end of the feeding pipe is communicated with a conical shell, and the sealing plate is configured as a conical head and is inserted and matched with the conical shell.
[0011] As a preferred technical scheme, the conical surface of the sealing plate is provided with a sealing ring.
[0012] As a preferred technical scheme, the nitrogen pipe is obliquely communicated on the feeding pipe, and the conveying pipe is communicated on the top side of the nitrogen pipe.
[0013] As a preferred technical scheme, the conveying pipe and the nitrogen pipe are both provided with valves.
[0014] As a preferred technical scheme, the feeding pipe is sleeved with an outer sleeve pipe at one end in the reaction kettle, and an annular separation cavity is left between the outer sleeve pipe and the feeding pipe.
[0015] As a preferred technical scheme, a plurality of square grooves are arrayed and penetrated on the outer sleeve pipe.
[0016] Compared with the traditional technical scheme, the beneficial effects of the present application are:
[0017] By utilizing the elastic force characteristics of the spring, the sealing plate blocks the feeding pipe, so that the raw materials can be prevented from entering the feeding pipe and causing blockage. When the catalyst needs to be added, the catalyst is first added into the nitrogen pipe, and the gas pressure generated by the continuous nitrogen conveying is used to press the spring, so that the blockage of the feeding pipe by the sealing plate is released. When the catalyst addition is completed, the nitrogen conveying is stopped, and under the elastic force of the spring, the sealing plate quickly blocks the feeding pipe, so that the ultra-small amount of auxiliary materials can be added online in the negative pressure reaction kettle body. The nitrogen pressure maintaining design ensures that the feeding pipe will not be blocked during the process of not adding catalyst, and also does not affect the normal production, thereby improving the production practicability. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 The structural diagram of the device provided for an embodiment of the present application is shown in the figure;
[0019] Figure 2 The sectional view of the device provided for an embodiment of the present application is shown in the figure;
[0020] Figure 3 The structural diagram of the feeding mechanism provided for an embodiment of the present application is shown in the figure;
[0021] Figure 4 The sectional view of the feeding mechanism provided for an embodiment of the present application is shown in the figure;
[0022] Figure 5 The Figure 4 The enlarged view of the local part A is shown in the figure;
[0023] Figure 6 TheFigure 4 Enlarged view of the middle part B;
[0024] In Figures 1-6 In the figure, 1, reaction kettle; 2, stirring rod; 3, motor; 4, feeding mechanism; 401, feeding pipe; 402, partition; 403, guide rod; 404, sealing plate; 405, limiting plate; 406, spring; 407, nitrogen pipe; 408, feeding tank; 409, conveying pipe; 4010, variable frequency gear pump; 5, conical shell; 6, sealing ring; 7, valve; 8, outer sleeve; 9, square groove; 10, support. DETAILED DESCRIPTION
[0025] The utility model is further described below with reference to the drawings.
[0026] The same or similar reference numerals in the drawings of the embodiments of the utility model correspond to the same or similar components; in the description of the utility model, it is understood that if the terms "top", "bottom", "left", "right", "front", "back", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the utility model and do not indicate or imply that the devices or elements referred to must have a particular orientation, structure and operation, therefore the terms describing the positional relationship in the drawings are only used for exemplary illustration and cannot be understood as a limitation on the patent, and for those skilled in the art, the specific meanings of the above terms can be understood according to the specific circumstances.
[0027] Please refer to Figures 1-6 The utility model discloses a kind of polyester PTT production reaction kettle feeding devices provided by an embodiment of the utility model, including reaction kettle 1 and feeding mechanism 4, stirring rod 2 is rotated and penetrated in the top wall in reaction kettle 1, the top end of stirring rod 2 is connected with motor 3 set on reaction kettle 1, preferably, the top and bottom of reaction kettle 1 are respectively communicated with feeding inlet and discharge outlet, the normal feeding and discharge demand of raw material can be met, when raw material is added into reaction kettle 1, motor 3 works, its output shaft drives stirring rod 2 to rotate, can stir raw material, when catalyst is added into reaction kettle 1, catalyst will be evenly distributed in raw material by the stirring of stirring rod 2.
[0028] The feeding mechanism 4 comprises a feeding pipe 401 which is vertically arranged on the reaction kettle 1 and has an open bottom, a baffle plate 402 is fixed in the top end of the feeding pipe 401, a guide rod 403 is coaxially slidably penetrated through the baffle plate 402, the bottom end of the guide rod 403 is connected with a sealing plate 404 which is used for sealing the open end of the feeding pipe 401, the top end of the guide rod 403 is connected with a limiting plate 405, a spring 406 which is sleeved on the guide rod 403 is arranged between the limiting plate 405 and the baffle plate 402, preferably, the spring 406 has a certain elastic strength, under the elastic resistance of the spring 406, the sealing plate 404 seals the end of the feeding pipe 401, so that the raw materials in the reaction kettle 1 cannot enter the feeding pipe 401, and the outer surface of the end of the feeding pipe 401 which is located outside the reaction kettle 1 is communicated with a nitrogen pipe 407, the nitrogen pipe 407 is used for connecting a pipeline for conveying nitrogen or directly connecting with a nitrogen supply device.
[0029] A feeding tank 408 is arranged on the reaction kettle 1 through a support 10, the feeding tank 408 is used for storing catalyst, the feeding tank 408 is communicated with a conveying pipe 409, the conveying pipe 409 is communicated with a variable frequency gear pump 4010 which is arranged on the feeding tank 408, when the catalyst is added into the reaction kettle 1, the catalyst is conveyed into the nitrogen pipe 407 through the conveying pipe 409, the variable frequency gear pump 4010 not only effectively ensures the conveying of the catalyst, but also can control the conveying amount of the catalyst, when the conveying amount of the catalyst is determined, the variable frequency gear pump 4010 stops working, nitrogen is conveyed into the nitrogen pipe 407 through an externally connected nitrogen supply device, the nitrogen conveys the catalyst in the nitrogen pipe 407 into the feeding pipe 401, the nitrogen and the catalyst flow downward, in the initial state, under the elastic resistance of the spring 406, the sealing plate 404 seals the feeding pipe 401, the nitrogen and the catalyst are temporarily intercepted, with the continuous input of the nitrogen, the air pressure in the feeding pipe 401 increases, under the action of the air pressure, the sealing plate 404 is pushed out and the sealing of the feeding pipe 401 is released.
[0030] In order to make the device more reasonable, preferably, the limiting of the limiting plate 405 is limited, when the sealing plate 404 is unblocked to the feeding pipe 401, the limiting plate 405 will extrude the spring 406, when the spring 406 is pressed, the unblocking gap between the sealing plate 404 and the feeding pipe 401 is small, although the gap is small, but it can meet the discharge of catalyst and nitrogen, at the same time, while discharging and discharging (the amount of nitrogen discharged from the end of the feeding pipe 401 is less than the amount of nitrogen inlet of the nitrogen pipe 407), the end of the feeding pipe 401 has a large air flow pressure, which can not only ensure that the catalyst can be completely transported from the feeding pipe 401 to the reaction kettle 1, but also can avoid the back string of raw materials in the reaction kettle 1, when the catalyst addition is completed, the external nitrogen supply device is closed, the nitrogen transportation is closed, when the air pressure is weakened, the spring 406 releases the elastic reset, so as to drive the guide rod 403 to slide reset, so that the sealing plate 404 blocks the feeding pipe 401 again, avoiding the raw materials in the reaction kettle 1 entering the feeding pipe 401.
[0031] As shown in Figures 1-6 , the guide rod 403 is slidably arranged in the feeding pipe 401, the spring 406 is used to block the feeding pipe 401, even if the end of the feeding pipe 401 is in the raw material, but it can be blocked by the sealing plate 404 to prevent the raw material from entering the feeding pipe 401, when adding catalyst, first add catalyst to the nitrogen pipe 407, even if the catalyst slides into the feeding pipe 401, it will be intercepted without nitrogen, and will not directly fall into the reaction kettle 1, only when the nitrogen is transported, the air pressure generated by the continuous transportation of nitrogen will push the sealing plate 404 out, extruding the spring 406 to unblock the feeding pipe 401, when the catalyst addition is completed, stop the transportation of nitrogen, under the resistance of the spring 406, the sealing plate 404 quickly blocks the feeding pipe 401, realizing the online addition of ultra-small amount of auxiliary materials in the negative pressure reaction kettle 1, the design of nitrogen pressure maintaining ensures that the feeding pipe 401 will not be blocked during the addition of catalyst, and will not affect the normal production, thereby improving the practicability.
[0032] As shown in Figure 6 , the inner diameter of the feeding pipe 401 gradually decreases from top to bottom, by gradually decreasing the inner diameter of the feeding pipe 401 from top to bottom, a conical pipe is formed, the inner diameter of the bottom end is smaller than the inner diameter of the top end, when the nitrogen is passed, the nitrogen flows downward, and the inner diameter gradually decreases, so that the air pressure at the bottom end gradually increases, which can not only ensure that the catalyst is effectively added to the raw materials in the reaction kettle 1, but also can effectively prevent the back string of raw materials during the addition process, thereby improving the practicability.
[0033] As shown in Figure 3 and Figure 6As shown, the bottom end of the feeding pipe 401 is communicated with a conical shell 5, and the sealing plate 404 is configured as a conical head and is insertedly matched with the conical shell 5. By communicating the conical shell 5 with the bottom end of the feeding pipe 401 and configuring the sealing plate 404 as a conical head, when the sealing plate 404 unblocks the feeding pipe 401, a downward conical channel is formed, the catalyst directly flows downward obliquely, the sealing plate 404 does not block the catalyst, and the catalyst is more smoothly added. At the same time, when the nitrogen gas is disconnected, under the elastic resistance of the spring 406, the conical configuration of the sealing plate 404 and the conical shell 5 enables them to be quickly inserted and matched, increases the overlapping area, and further improves the blocking effect.
[0034] As shown in the Figure 6 , the conical surface of the sealing plate 404 is provided with a sealing ring 6. By arranging the sealing ring 6, after the sealing plate 404 is inserted into the conical shell 5 under the elastic resistance of the spring 406, the sealing ring 6 is squeezed, thereby improving the sealing effect between the conical shell 5 and the sealing plate 404, effectively preventing raw materials from entering the feeding pipe 401 and preventing blockage, thereby improving the practicability.
[0035] As shown in the Figure 5 , the nitrogen gas pipe 407 is obliquely communicated on the feeding pipe 401, and the conveying pipe 409 is communicated on the top side of the nitrogen gas pipe 407. The oblique communication of the nitrogen gas pipe 407 enables the catalyst to directly slide into the feeding pipe 401 after being conveyed from the conveying pipe 409 into the nitrogen gas pipe 407, so that the catalyst can be conveyed into the reaction kettle 1 in the first time by the conveying of nitrogen gas. At the same time, the oblique arrangement reduces the direct impact force of nitrogen gas on the feeding pipe 401, so that the nitrogen gas can more smoothly flow along the feeding pipe 401 and convey the catalyst by the smooth gas pressure.
[0036] As shown in the Figure 5 , the conveying pipe 409 and the nitrogen gas pipe 407 are both provided with valves 7. Preferably, when the catalyst is added, both valves 7 need to be opened. The valve 7 on the feeding pipe 401 is close to the nitrogen gas pipe 407. After the catalyst is added to the nitrogen gas pipe 407 and slides into the feeding pipe 401, the valve 7 on the conveying pipe 409 is closed first, so that when the nitrogen gas is conveyed, the nitrogen gas cannot be divided into the conveying pipe 409. After the catalyst is added to the reaction kettle 1 and the nitrogen gas conveying is stopped, the nitrogen gas still exists in the feeding pipe 401, but the nitrogen gas cannot blow open the sealing plate 404. At this time, the valve 7 on the nitrogen gas pipe 407 is closed, the nitrogen gas in the feeding pipe 401 is retained, so that when the catalyst or other auxiliary materials are added again subsequently, the nitrogen gas can respond more quickly to blow open the sealing plate 404.
[0037] As shown in the Figure 3 , Figure 5 , and Figure 6As shown in the drawings, the outer sleeve 8 is sleeved on one end of the feeding pipe 401 in the reaction kettle 1, and an annular separation cavity is left between the outer sleeve 8 and the feeding pipe 401. Preferably, the outer sleeve 8 is connected with the reaction kettle 1 through a flange, and the outer sleeve 8 is welded with the feeding pipe 401. By arranging the outer sleeve 8, the outer sleeve 8 protects the feeding pipe 401, preventing the feeding pipe 401 from being deformed by the agitation of the material in the kettle for a long time, thereby improving the practicability.
[0038] As shown in the drawings, Figure 3 and Figure 6 A plurality of square grooves 9 are arranged and penetrated on the outer sleeve 8. Since the outer sleeve 8 and the feeding pipe 401 have an annular separation cavity, the raw materials will flow into the annular separation cavity. Through the square grooves 9, the material flow is facilitated, and local dead angles of the material are avoided, thereby improving the practicability.
[0039] Any numerical values recited herein include all values from lower to upper bounds using the unit specified in the lower and upper bounds. For example, if a value from 1 to 90, preferably from 20 to 80, more preferably from 30 to 70 is recited, it is intended that values such as 15 to 85, 22 to 68, 43 to 51, 30 to 32 etc. are expressly enumerated in this specification. For values which are less than one, one unit is considered to be 0.0001, 0.001, 0.01, 0.1 as appropriate. These are only examples of what is specifically enumerated herein, and are not meant to limit the application in any way. Furthermore, the inclusion of a numerical range excludes only those specific values that fall within the range, but does not exclude values outside the range.
[0040] All ranges recited herein include the endpoints and all numbers between the endpoints. "About" or "approximately" as applied to any numerical range means that the exact value is not essential to the application. Thus, "about 20 to 30" is intended to cover "about 20 to about 30", including at least the specified endpoints.
[0041] All articles and references, including patents and publications, are herein incorporated by reference for all purposes. The term "consisting essentially of to describe combinations shall include the elements, ingredients, components or steps identified, and such other elements ingredients, components or steps that do not materially affect the basic and novel characteristics of the combinations. The use of the term "comprising" or "including" to describe combinations herein is also taken to mean that embodiments consisting essentially of the recited elements, ingredients, components or steps are within the scope of the application. By using the term "may" herein, it is intended that any property so described, for example, any attribute, can or can not be present.
[0042] Plural elements, components, parts, or steps can be provided by a single integrated element, component, part, or step. Alternatively, a single integrated element, component, part, or step might be divided into separate plural elements, components, parts, or steps. To the extent that the disclosure of elements, components, parts, or steps is expressed in terms of "containing," "comprising," "including," or "having," it should be understood that the elements, components, parts, or steps can also "consist essentially of or "consist of the recited elements, components, parts, or steps.
[0043] It is understood that the above description is intended to be illustrative and not restrictive. Many embodiments and many applications besides the examples provided herein will be apparent to those of skill in the art upon reading the above description. The scope of the teachings should, therefore, be determined not with reference to the above description, but should instead be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are incorporated by reference for the purpose of the present disclosure. Any incorporation by reference of any article or reference which has not been available to the public through no fault of the present inventors or through no fault of anyone owning or controlling the article or reference is expressly discontinued, and the present disclosure is hereby relied upon independently.
Claims
1. A polyester PTT production reactor charging device, characterized in that, Include: The reaction kettle, the rotation is penetrated in the inner top wall of the reaction kettle and is connected with the motor arranged on the reaction kettle; The feeding mechanism includes a vertically arranged feeding pipe on the reaction kettle with an open bottom, a baffle is fixed inside the top end of the feeding pipe, a guide rod is coaxially slidably penetrated through the baffle, the bottom end of the guide rod is connected with a sealing plate for sealing the open end of the feeding pipe, the top end of the guide rod is connected with a limiting plate, a spring is installed between the limiting plate and the baffle and is sleeved on the guide rod, the outer surface of one end of the feeding pipe outside the reaction kettle is communicated with a nitrogen pipe, the feeding pipe is communicated with a conveying pipe, the conveying pipe is communicated with a variable frequency gear pump arranged on the feeding tank.
2. The polyester PTT production reaction kettle feeding device according to claim 1, characterized in that, The inner diameter of the feeding pipe gradually decreases from top to bottom.
3. The polyester PTT production reaction kettle feeding device according to claim 1, characterized in that, The bottom end of the feeding pipe is communicated with a conical shell, the sealing plate is configured as a conical head and is inserted and matched with the conical shell.
4. The polyester PTT production reaction kettle feeding device according to claim 3, characterized in that, The conical surface of the sealing plate is provided with a sealing ring.
5. The polyester PTT production reaction kettle feeding device according to claim 1, characterized in that, The nitrogen pipe is obliquely communicated with the feeding pipe, and the conveying pipe is communicated with the top side of the nitrogen pipe.
6. The polyester PTT production reaction kettle feeding device according to claim 1, characterized in that, Valves are arranged on the conveying pipe and the nitrogen pipe.
7. The polyester PTT production reaction kettle feeding device according to claim 1, characterized in that, The feeding pipe is sleeved with an outer sleeve on one end inside the reaction kettle, and an annular separation cavity is left between the outer sleeve and the feeding pipe.
8. The polyester PTT production reaction kettle feeding device according to claim 7, characterized in that, A plurality of square grooves are arrayed and penetrated through the outer sleeve.