Liquid inlet flushing device of pulping kettle
By installing a spray device in the slurry kettle liquid inlet device to flush the butanediol feed pipeline, the problem of blockage of the butanediol feed pipeline is solved, ensuring the uniformity of material mixing and product quality, and achieving safe and efficient production.
Patent Information
- Application Number
- CN202422072289.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-26
- Publication Date
- 2025-08-26
- Estimated Expiration
- 2034-08-26
AI Technical Summary
In the production process of polybutylene terephthalate, the butylene glycol feed pipeline is prone to blockage due to dust adhesion, affecting the material molar ratio and product quality.
A liquid flushing device for beating kettle is designed. By installing a spray device at the end of the butanediol feed pipeline, the pipeline is flushed with a butanediol solution to prevent dust from adhering.
It effectively prevents the blockage of the butanediol feed pipeline, ensures the stability of the material molar ratio and product quality, and achieves safe, labor-saving and efficient operation.
Smart Images
Figure CN223266020U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of polyester production flushing, in particular to a beating kettle liquid inlet flushing device. Background Art
[0002] Polybutylene terephthalate (PBT) is a polyester made by the polycondensation of purified terephthalic acid (PTA) and butanediol. It is an important thermoplastic polyester and one of the five major engineering plastics. PBT is synthesized primarily through the transesterification process (DMT) and direct esterification (PTA). In recent years, with the increasing production and significant improvement in PTA purity, the PTA process has become the mainstream process for PBT synthesis. The direct esterification process uses purified terephthalic acid (PTA) and 1,4-butanediol (BD) as raw materials. A titanium-based catalyst and PTA slurry are added to an esterification reactor. The esterification reaction proceeds under a specific pressure, temperature, and stirring conditions. The water and THF byproduct generated during the esterification process are separated, purified, recovered, and pre-condensed to produce a prepolymer. The prepolymer continues to condense in a final polycondensation disc reactor under high vacuum and high temperature until the PBT reaches the desired viscosity. The pellets are then cut, dried, weighed, and packaged.
[0003] During the PBT production process, the two main raw materials, purified terephthalic acid and butanediol, are first mixed in a beating kettle. Since purified terephthalic acid and butanediol are immiscible, they need to be mixed through forced movement through stirring. Dust is easily generated during the forced stirring of the raw materials and the discharge of purified terephthalic acid. Dust adheres to the pipe wall for a long time, which can easily cause blockage in the feed pipeline of the main raw material butanediol, thereby ultimately affecting the material molar ratio and thus the quality of the PBT product.
[0004] Therefore, it is very necessary to research and invent a new feed pipeline flushing device without changing the operation of the original device. Summary of the Invention
[0005] The utility model provides a beating kettle liquid inlet flushing device, which overcomes the shortcomings of the above-mentioned prior art and can effectively solve the problem of blockage of the butanediol feed line in the existing polybutylene terephthalate production.
[0006] The technical solution of the present utility model is achieved through the following measures: a beating kettle liquid inlet flushing device, comprising a beating kettle, a beating kettle agitator is fixedly arranged in the beating kettle, the first feed port on the top of the beating kettle is fixedly connected to the second feed pipeline of butanediol, the second feed port on the top of the beating kettle is fixedly connected to the purified terephthalic acid feed pipeline, the top outlet of the beating kettle is fixedly connected to the venting pipeline, the first discharge port at the bottom of the beating kettle is fixedly connected to the first discharge pipeline, the second discharge port at the bottom of the beating kettle is fixedly connected to the second discharge pipeline, the inlet of the second butanediol feed pipeline and the venting pipeline are fixedly connected with the first butanediol feed pipeline, and the outlet end of the first butanediol feed pipeline is fixedly provided with a spraying device.
[0007] The following are further optimizations and / or improvements to the above-mentioned utility model technical solution:
[0008] The above-mentioned spraying device is umbrella-shaped, and the umbrella surface angle is 120 degrees.
[0009] A purified terephthalic acid feed pump, a first discharge pump, and a second discharge pump are fixedly installed on the purified terephthalic acid feed pipeline, the first discharge pipeline, and the second discharge pipeline, respectively.
[0010] The outlet portion of the above-mentioned first butanediol feed pipeline runs through the vent pipeline. The vent pipeline between the first butanediol feed pipeline and the pulping kettle is fixedly connected with a nitrogen pipeline, and the nitrogen pipeline inlet is located below the spray device.
[0011] The third discharge port at the bottom of the beating kettle is fixedly connected to a condensate drainage pipeline, and the third discharge port at the bottom of the beating kettle is fixedly connected to a sewage pipeline.
[0012] The second butanediol feed pipeline between the inlet of the second butanediol feed pipeline and the first butanediol feed pipeline is fixedly provided with a remote flow meter and a main feed valve in sequence according to the flow direction of the medium; the second butanediol feed pipeline between the first butanediol feed pipeline and the pulping kettle is fixedly provided with a first feed valve and a third feed valve in sequence according to the flow direction of the medium; the first butanediol feed pipeline is fixedly provided with a second feed valve; the first discharge pipeline between the pulping kettle and the first discharge pump is fixedly provided with a first discharge valve; the second discharge pipeline between the pulping kettle and the second discharge pump is fixedly provided with a second discharge valve; and a remote liquid level meter and a remote temperature gauge are fixedly provided at the lower part of the pulping kettle respectively.
[0013] The utility model has a reasonable and compact structure and is easy to use. The blind flange of the original vent line of the beating kettle is connected to the butanediol feed pipeline, and a spray device is installed at the end of the butanediol feed pipeline. At the same time, the original butanediol feed pipeline is retained as a backup butanediol feed pipeline. When the dust generated during the mixing and stirring process of the beating kettle rises into the vent line, it encounters the butanediol solution sprayed from top to bottom, and the dust is intercepted and washed down, thereby preventing the dust from adhering to the pipe wall for a long time and causing blockage. The present invention creatively introduces a spray device without changing the operation of the original device, and has the characteristics of safety, labor saving, simplicity and high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Attachment Figure 1 This is a schematic diagram of the process flow of this utility model.
[0015] Attachment Figure 1 The codes are: 1 for the beating kettle, 2 for the venting line, 3 for the first butanediol feed line, 4 for the second butanediol feed line, 5 for the purified terephthalic acid feed line, 6 for the condensate drainage line, 7 for the first discharge line, 8 for the sewage line, 9 for the second discharge line, 10 for the nitrogen line, 11 for the purified terephthalic acid feed pump, 12 for the first discharge pump, 13 for the second discharge pump, 14 for the main feed valve, 15 for the first feed valve, 16 for the second feed valve, 17 for the third feed valve, 18 for the first discharge valve, 19 for the second discharge valve, 20 for the beating kettle agitator, 21 for the spraying device, 22 for the remote flow meter, 23 for the remote level meter, and 24 for the remote temperature meter. DETAILED DESCRIPTION
[0016] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.
[0017] In the present invention, unless otherwise specified, the equipment and devices used are all the equipment and devices known and used in the art.
[0018] In this utility model, for the convenience of description, the relative position relationship of each component is described based on the Figure 1 The layout is described in detail, such as the positional relationships of front, back, top, bottom, left, and right are based on the Figure 1 The layout direction is determined by the
[0019] The present invention will be further described below in conjunction with the embodiments and accompanying drawings:
[0020] Example 1: As shown in the attached Figure 1As shown, the beating kettle liquid inlet and flushing device includes a beating kettle 1, a beating kettle agitator 20 is fixedly installed in the beating kettle 1, the first feed port on the top of the beating kettle 1 is fixedly connected to the second butanediol feed pipeline 4, the second feed port on the top of the beating kettle 1 is fixedly connected to the purified terephthalic acid feed pipeline 5, the top outlet of the beating kettle 1 is fixedly connected to the vent pipeline 2, the first discharge port at the bottom of the beating kettle 1 is fixedly connected to the first discharge pipeline 7, the second discharge port at the bottom of the beating kettle 1 is fixedly connected to the second discharge pipeline 9, the inlet of the second butanediol feed pipeline 4 and the vent pipeline 2 are fixedly connected to the first butanediol feed pipeline 3, and the outlet end of the first butanediol feed pipeline 3 is fixedly provided with a spraying device 21.
[0021] As required, purified terephthalic acid and butanediol are insoluble in each other and need to be mixed by forced stirring. However, dust is easily generated during the forced stirring and purified terephthalic acid feeding process. Dust adheres to the pipe wall for a long time and can easily cause blockage in the butanediol feed pipeline, thereby ultimately affecting the material molar ratio. The vent line 2 is connected to the butanediol first feed pipeline 3, and the butanediol feed pipeline is flushed by the spray device 21 at the end of the butanediol first feed pipeline 3 to prevent it from clogging.
[0022] The above-mentioned beating kettle liquid inlet and flushing device can be further optimized and / or improved according to actual needs:
[0023] Example 2: The difference between it and Example 1 is that: Figure 1 As shown, the spray device 21 is umbrella-shaped, and the umbrella surface angle is 120°.
[0024] Example 3: The difference between it and Example 1 to Example 2 is that: Figure 1 As shown, a purified terephthalic acid feed pump 11 , a first discharge pump 12 , and a second discharge pump 13 are fixedly installed on the purified terephthalic acid feed pipeline 5 , the first discharge pipeline 7 , and the second discharge pipeline 9 , respectively.
[0025] Example 4: The difference between it and Example 1 to Example 3 is that: Figure 1 As shown, the outlet portion of the first butanediol feed pipeline 3 passes through the vent pipeline 2, and a nitrogen pipeline 10 is fixedly connected to the vent pipeline 2 between the first butanediol feed pipeline 3 and the pulping kettle 1, and the inlet of the nitrogen pipeline 10 is located below the spray device 21.
[0026] The outlet portion of the first butanediol feed line 3 runs through the vent line 2, increasing the contact area between the spray device 21 and the upwardly moving dust, making it easier for the spray device 21 to flush the first butanediol feed line 3 and prevent it from being blocked.
[0027] Example 5: The difference between it and Example 1 to Example 4 is that: Figure 1As shown, the third discharge port at the bottom of the pulping kettle 1 is fixedly connected to a condensate drainage pipeline 6 , and the third discharge port at the bottom of the pulping kettle 1 is fixedly connected to a sewage pipeline 8 .
[0028] Example 6: The difference between it and Example 1 to Example 5 is that: Figure 1 As shown, a remote flow meter 22 and a main feed valve 14 are fixedly provided on the second butanediol feed pipeline 4 between the inlet of the second butanediol feed pipeline 4 and the first butanediol feed pipeline 3 in sequence according to the flow direction of the medium; a first feed valve 15 and a third feed valve 17 are fixedly provided on the second butanediol feed pipeline 4 between the first butanediol feed pipeline 3 and the pulping kettle 1 in sequence according to the flow direction of the medium; a second feed valve 16 is fixedly provided on the first butanediol feed pipeline 3; a first discharge valve 18 is fixedly provided on the first discharge pipeline 7 between the pulping kettle 1 and the first discharge pump 12; a second discharge valve 19 is fixedly provided on the second discharge pipeline 9 between the pulping kettle 1 and the second discharge pump 13; a remote liquid level meter 23 and a remote temperature gauge 24 are fixedly provided on the lower part of the pulping kettle 1.
[0029] As needed, the various pipelines and equipment of the pulping kettle liquid inlet flushing device can also be equipped with conventional valves, thermometers and pressure gauges known in the art according to production needs.
[0030] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or removed according to actual needs to meet the requirements of different situations.
[0031] The usage process of the embodiment of the present invention is as follows: first, close the first feed valve 15, the first discharge valve 18, and the second discharge valve 19, and introduce nitrogen through the nitrogen pipeline 10; then, open the main feed valve 14 and the second feed valve 16 in sequence, start the purified terephthalic acid feed pump 11, and carry out the PBAT beating kettle main raw material feeding operation. At the same time, start the beating kettle agitator 20; finally, after the two materials are evenly mixed, open the first discharge valve 18 or the second discharge valve 19, start the corresponding first discharge pump 12 or the second discharge pump 13, and send the evenly mixed material to the next process.
Claims
1. A beating kettle liquid inlet flushing device, characterized in that The invention comprises a beating kettle, in which a beating kettle agitator is fixedly arranged, a first feed port on the top of the beating kettle is fixedly connected to a second feed pipeline for butanediol, a second feed port on the top of the beating kettle is fixedly connected to a feed pipeline for purified terephthalic acid, an outlet on the top of the beating kettle is fixedly connected to a venting pipeline, a first discharge port at the bottom of the beating kettle is fixedly connected to a first discharge pipeline, a second discharge port at the bottom of the beating kettle is fixedly connected to a second discharge pipeline, a first feed pipeline for butanediol is fixedly connected between an inlet of the second feed pipeline for butanediol and a venting pipeline, and a spraying device is fixedly arranged on an outlet end of the first feed pipeline for butanediol.
2. The beating kettle liquid inlet flushing device according to claim 1, characterized in that The spray device is umbrella-shaped, and the umbrella angle is 120°.
3. The beating kettle liquid inlet flushing device according to claim 1 or 2, characterized in that A purified terephthalic acid feed pipeline, a first discharge pipeline, and a second discharge pipeline are respectively fixedly installed with a purified terephthalic acid feed pump, a first discharge pump, and a second discharge pump.
4. The beating kettle liquid inlet flushing device according to claim 1 or 2, characterized in that The outlet portion of the first butanediol feed line runs through the vent line. The vent line between the first butanediol feed line and the pulping kettle is fixedly connected with a nitrogen line, and the nitrogen line inlet is located below the spray device.
5. The beating kettle liquid inlet flushing device according to claim 3, characterized in that The outlet portion of the first butanediol feed line runs through the vent line. The vent line between the first butanediol feed line and the pulping kettle is fixedly connected with a nitrogen line, and the nitrogen line inlet is located below the spray device.
6. The beating kettle liquid inlet flushing device according to claim 1, 2 or 5, characterized in that The third discharge port at the bottom of the beating kettle is fixedly connected to a condensate drainage pipeline, and the third discharge port at the bottom of the beating kettle is fixedly connected to a sewage pipeline.
7. The beating kettle liquid inlet flushing device according to claim 3, characterized in that The third discharge port at the bottom of the beating kettle is fixedly connected to a condensate drainage pipeline, and the third discharge port at the bottom of the beating kettle is fixedly connected to a sewage pipeline.
8. The beating kettle liquid inlet flushing device according to claim 4, characterized in that The third discharge port at the bottom of the beating kettle is fixedly connected to a condensate drainage pipeline, and the third discharge port at the bottom of the beating kettle is fixedly connected to a sewage pipeline.
9. The beating kettle liquid inlet flushing device according to claim 1 or 2 or 5 or 7 or 8, characterized in that The second butanediol feed pipeline between the inlet of the second butanediol feed pipeline and the first butanediol feed pipeline is fixedly provided with a remote flow meter and a main feed valve in sequence according to the flow direction of the medium; the second butanediol feed pipeline between the first butanediol feed pipeline and the pulping kettle is fixedly provided with a first feed valve and a third feed valve in sequence according to the flow direction of the medium; the first butanediol feed pipeline is fixedly provided with a second feed valve; the first discharge pipeline between the pulping kettle and the first discharge pump is fixedly provided with a first discharge valve; the second discharge pipeline between the pulping kettle and the second discharge pump is fixedly provided with a second discharge valve; and a remote liquid level meter and a remote temperature gauge are fixedly provided at the lower part of the pulping kettle respectively.
10. The beating kettle liquid inlet flushing device according to claim 6, characterized in that The second butanediol feed pipeline between the inlet of the second butanediol feed pipeline and the first butanediol feed pipeline is fixedly provided with a remote flow meter and a main feed valve in sequence according to the flow direction of the medium; the second butanediol feed pipeline between the first butanediol feed pipeline and the pulping kettle is fixedly provided with a first feed valve and a third feed valve in sequence according to the flow direction of the medium; the first butanediol feed pipeline is fixedly provided with a second feed valve; the first discharge pipeline between the pulping kettle and the first discharge pump is fixedly provided with a first discharge valve; the second discharge pipeline between the pulping kettle and the second discharge pump is fixedly provided with a second discharge valve; and a remote liquid level meter and a remote temperature gauge are fixedly provided at the lower part of the pulping kettle respectively.