CN116851368A - Device and method for cleaning biodegradable resin tackifying system pipeline - Google Patents
Device and method for cleaning biodegradable resin tackifying system pipeline Download PDFInfo
- Publication number
- CN116851368A CN116851368A CN202310679478.0A CN202310679478A CN116851368A CN 116851368 A CN116851368 A CN 116851368A CN 202310679478 A CN202310679478 A CN 202310679478A CN 116851368 A CN116851368 A CN 116851368A
- Authority
- CN
- China
- Prior art keywords
- cleaning
- pipeline
- preparation tank
- alkali liquor
- liquid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004140 cleaning Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 26
- 229920006167 biodegradable resin Polymers 0.000 title claims abstract description 16
- 239000003513 alkali Substances 0.000 claims abstract description 51
- 239000007788 liquid Substances 0.000 claims abstract description 45
- 238000002360 preparation method Methods 0.000 claims abstract description 39
- 239000000155 melt Substances 0.000 claims abstract description 35
- 238000010438 heat treatment Methods 0.000 claims abstract description 21
- 238000001914 filtration Methods 0.000 claims abstract description 5
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 238000005406 washing Methods 0.000 claims description 8
- 238000007664 blowing Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 230000007935 neutral effect Effects 0.000 claims description 3
- 238000010926 purge Methods 0.000 claims description 3
- 239000012670 alkaline solution Substances 0.000 claims description 2
- 238000010992 reflux Methods 0.000 claims description 2
- 239000000243 solution Substances 0.000 claims 2
- 238000004519 manufacturing process Methods 0.000 abstract description 11
- 239000000463 material Substances 0.000 abstract description 10
- 239000012535 impurity Substances 0.000 abstract description 7
- 239000000047 product Substances 0.000 description 9
- 235000011121 sodium hydroxide Nutrition 0.000 description 9
- 229920002961 polybutylene succinate Polymers 0.000 description 7
- 239000004631 polybutylene succinate Substances 0.000 description 7
- 229920001707 polybutylene terephthalate Polymers 0.000 description 7
- 239000002245 particle Substances 0.000 description 6
- 239000004970 Chain extender Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000000571 coke Substances 0.000 description 3
- 239000007857 degradation product Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- -1 Polybutylene terephthalate Polymers 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 230000032050 esterification Effects 0.000 description 1
- 238000005886 esterification reaction Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000006068 polycondensation reaction Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
- B08B9/032—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cleaning In General (AREA)
Abstract
The invention relates to the technical field of production of biodegradable materials, in particular to a device and a method for cleaning a pipeline of a biodegradable resin tackifying system. The cleaning device comprises a preparation tank, a circulating pump, a screen changer, a liquid leakage receiving tank and a heating mechanism; alkali liquor is stored in the preparation tank; the inlet end of the circulating pump is connected with the liquid outlet of the preparation tank, the outlet end of the circulating pump is connected with the melt pipeline, and one end of a die head of a granulator of the melt pipeline is connected with the liquid inlet of the preparation tank through a return pipe so as to form alkali liquor circulation; the screen changer is arranged on the melt pipeline and is used for filtering alkali liquor; the liquid leakage receiving groove is arranged below the screen changer and is connected with a liquid inlet of the preparation groove through a liquid return pipe, and the liquid leakage receiving groove is used for collecting leaked alkali liquid; the heating mechanism is arranged in the preparation tank and is used for heating the alkali liquor. The invention can effectively remove black impurities in the melt pipeline by using the heated alkali liquor, thereby improving the product quality.
Description
Technical Field
The invention relates to the technical field of production of biodegradable materials, in particular to a device and a method for cleaning a pipeline of a biodegradable resin tackifying system.
Background
Polybutylene terephthalate (PBAT) and polybutylene succinate (PBS) are materials with good biodegradability, and the industrial production of PBAT/PBS is mainly divided into a direct esterification polycondensation method (one-step method) and a chain extension method (two-step method), and the main differences of the two methods are the reaction time and whether a chain extender is used. In the production process of the one-step method, high-temperature materials enter a tackifying system for further reaction after the reaction of a final polymerization kettle is finished, part of melt can form degradation products and carbonized cokes which are adhered to the pipe wall, and once the degradation products and the carbonized cokes enter the melt, the PBAT/PBS products can be subjected to black grain and yellow grain slicing, so that the quality of the products is seriously affected. The two-step method is that the materials enter a chain extension system after being discharged from a final polymerization kettle, and molecular chains are increased by adding a chain extender. For the two production methods, the one-step process route is mainly adopted in China, the one-step process is mature, the production process is stable and easy to control, the product quality is stable, and the one-step process is better in safety because the toxicity of the chain extender is stronger. However, in the PBAT/PBS production process, no matter what production method is adopted, because the device is required to be stopped and overhauled regularly due to the characteristics of the product, materials in a melt pipeline are difficult to drain out in a stopping stage, scale is extremely easy to build in the pipeline, and after degradation products and carbonized cokes attached to the pipeline wall during production flow into the product, the quality of the product is affected, and the device is blocked in severe cases, so that economic loss is caused.
Currently, the commonly used pipe cleaning methods are TEG cleaning and steam decomposition. However, as the PBAT/PBS product needs a melt filter to remove impurities in the melt before being cut into particles, the viscosity of the material is higher after the material comes out of the tackifying kettle, and in order to ensure the material circulation, the waste discharge of the granulator is avoided, and the purpose of purifying the impurities is achieved by adopting a screen changer, the problem of liquid leakage can be caused due to the characteristics of the screen changer, and the triethylene glycol cleaning method is higher in temperature (generally more than 250 ℃) and inflammable, so that the leakage is dangerous. For the steam decomposition method, because part of melt is attached to the pipe wall for a long time, steam cannot permeate, and the ideal cleaning effect cannot be achieved.
Disclosure of Invention
First, the technical problem to be solved
The invention aims to solve the technical problems that black substances scaling in a melt pipeline can flow into a melt to cause slicing to form black particles and yellow particles and influence the quality of products.
(II) technical scheme
In order to solve the technical problems, the invention provides a pipeline cleaning device of a biodegradable resin tackifying system, which comprises a preparation tank, a circulating pump, a screen changer, a liquid leakage receiving tank and a heating mechanism; alkali liquor is stored in the preparation tank; the inlet end of the circulating pump is connected with the liquid outlet of the preparation tank, the outlet end of the circulating pump is connected with a melt pipeline, and one end of a die head of a granulator of the melt pipeline is connected with the liquid inlet of the preparation tank through a return pipe so as to form alkali liquor circulation; the screen changer is arranged on the melt pipeline and is used for filtering alkali liquor; the liquid leakage receiving groove is arranged below the screen changer and is connected with a liquid inlet of the preparation groove through a liquid return pipe, and the liquid leakage receiving groove is used for collecting leaked alkali liquid; the heating mechanism is arranged in the preparation tank and is used for heating the alkali liquor.
Further, a Y-shaped filter is arranged between the circulating pump and the preparation tank.
Further, the outlet end of the circulating pump is connected with a booster pump.
Further, a liquid level meter is arranged on the preparation tank.
In another aspect, the present invention provides a method for cleaning a pipe of a biodegradable resin tackifying system, comprising the steps of:
starting a heating mechanism to heat water in the preparation tank, and adding sodium hydroxide to prepare alkali liquor;
enabling alkali liquor to enter a melt pipeline through a circulating pump, and then refluxing from a die head of the granulator to a preparation tank for circulating alkali washing;
cooling after cleaning, and cleaning alkali liquor in the melt pipeline by using clear water;
blowing the melt pipe with compressed air until the discharged water is detected to be neutral;
and (3) purging the melt pipeline by using steam, and cleaning the dead angle after the alkali liquor is thoroughly removed.
Further, in the process of circulating alkaline washing, the temperature of the alkaline solution is 90-100 ℃.
Further, when the water is heated to 50 ℃, sodium hydroxide is added to prepare alkali liquor.
Further, the concentration of the alkali liquor is 20-25%.
(III) beneficial effects
The technical scheme of the invention has the following advantages: the black impurities in the melt pipeline can be effectively removed by using the heated alkali liquor, so that the cleaning without dead angles is achieved comprehensively, the effect of no black impurities is achieved in the starting and discharging stage, the loss caused by waste discharge can be greatly reduced, the situation that black particles and yellow particles appear in PBAT/PBS slices due to the fact that the black impurities flow into the melt after production can be avoided, the product quality is improved, and the production period of the device is greatly prolonged. Meanwhile, the cleaning medium is low in required heating temperature, nonflammable, and capable of being recycled, and aiming at the problem of leakage of the screen changer, the bottom of the screen changer is provided with a leakage receiving groove for receiving leaked alkali liquor.
Drawings
FIG. 1 is a schematic structural view of a pipe cleaning device for a biodegradable resin tackifying system according to the present invention;
in the figure: 1. a preparation groove; 2. a circulation pump; 3. a screen changer; 4. a liquid leakage receiving groove; 5. a heating mechanism; 6. a melt conduit; 7. a die head of a granulator; 8. a Y-type filter; 9. a booster pump; 10. a level gauge.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Referring to fig. 1, the invention provides a cleaning device for a biodegradable resin tackifying system pipeline, which comprises a preparation tank 1, a circulating pump 2, a screen changer 3, a liquid leakage receiving tank 4 and a heating mechanism 5. Alkali liquor is stored in the preparation tank 1. The inlet end of the circulating pump 2 is connected with the liquid outlet of the preparation tank 1, the outlet end of the circulating pump 2 is connected with the melt pipeline 6, and one end of the die head 7 of the granulator of the melt pipeline 6 is connected with the liquid inlet of the preparation tank 1 through a return pipe so as to form alkali liquor circulation. The circulating pump 2 is a pump for circulating liquid for conveying reaction, absorption, separation and absorption liquid regeneration in the device. The lift is lower, only is used for overcoming the pressure drop of a circulating system, and the alkali liquor circulating pump 2 with low lift can be adopted. The screen changer 3 is arranged on the melt pipeline 6, and the screen changer 3 is used for filtering alkali liquor. The screen changer 3 is a manual or automatic switching device comprising one or more screens for filtering out foreign particles and impurities as the plasticized material flows through the screens. The filter screen is supported by an alloy perforated plate mounted on a plate or column carrier which can be moved to switch between an operative position and an off-line inoperative position of the system. The screen changer 3 may be installed on any new or existing extruder, melt pump, reactor or other extrusion line and may be used to filter any type of polymer, rubber or ceramic melt. The liquid leakage receiving tank 4 is arranged below the screen changer 3 and is connected with a liquid inlet of the preparation tank 1 through a liquid return pipe, the liquid leakage receiving tank 4 is used for collecting a small amount of alkali liquid leaked by the screen changer 3, and the alkali liquid in the liquid leakage receiving tank 4 flows back to the preparation tank 1 by gravity, so that the liquid leakage receiving tank is convenient to recycle, and meanwhile, the hidden danger of production is reduced. The heating mechanism 5 is arranged in the preparation tank 1, the heating mechanism 5 can adopt an electric heating pipe, and the heating mechanism 5 is used for heating alkali liquor, so that the alkali liquor achieves the optimal cleaning effect.
In some embodiments, a Y-filter 8 is disposed between the circulation pump 2 and the preparation tank 1, and the Y-filter 8 is used to filter the cleaned residues.
In some embodiments, the outlet end of the circulating pump 2 is connected with a booster pump 9, and the cleaning device is connected with the inlet of the booster pump 9 by a special joint. The booster pump 9 is a pump installed in the pipeline for boosting, and is a special name of a plurality of pump types. The pipeline booster pump 9 is a pump that is installed in a pipeline and conveys liquid, and is not limited to a pump of a certain type or form, and may be a vertical type or a horizontal type, and may be referred to as a pipeline booster pump 9, such as a vertical multistage centrifugal pump, a horizontal multistage centrifugal pump, a vertical single stage centrifugal pump, a horizontal single stage centrifugal pump, a self-priming centrifugal pump, or the like.
In some embodiments, the liquid level meter 10 is disposed on the preparation tank 1, and after the alkali liquid is filled in the melt pipe 6 during the process of circulating alkali washing, the liquid level of the liquid level meter 10 on the preparation tank 1 cannot be lower than the heating mechanism 5.
In another aspect, the present invention provides a method for cleaning a pipe of a biodegradable resin tackifying system, comprising the steps of:
starting a heating mechanism 5 to heat water in the preparation tank 1, and adding sodium hydroxide to prepare alkali liquor;
alkali liquor enters a melt pipeline 6 through a circulating pump 2 and then flows back to the preparation tank 1 from a die head 7 of the granulator for circulating alkali washing;
cooling after cleaning, and cleaning alkali liquor in the melt pipeline 6 by using clear water;
blowing the melt pipe 6 with compressed air until the discharged water is detected as neutral;
the steam is used for purging the melt pipeline 6, and the cleaning is completed after the alkali liquor in dead corners is thoroughly removed.
In some embodiments, the temperature of the lye during the cyclic alkaline wash is from 90 ℃ to 100 ℃, preferably 95 ℃.
In some embodiments, the caustic soda lye is prepared by adding sodium hydroxide while heating the water to 50 ℃.
In some embodiments, the lye formulation concentration is 20% -25%, and the alkaline wash cycle time is 11-12 hours when the lye concentration is between 21% -22%; when the concentration of the alkali liquor is between 22 and 23 percent, the alkali washing cycle time is 9 to 10 hours; when the concentration of the alkali liquor is between 23 and 25 percent, the alkali washing cycle time is 8 hours.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present invention, and these modifications and variations should also be regarded as the scope of the invention.
Claims (8)
1. The pipeline cleaning device of the biodegradable resin tackifying system is characterized by comprising a preparation tank, a circulating pump, a screen changer, a liquid leakage receiving tank and a heating mechanism;
alkali liquor is stored in the preparation tank;
the inlet end of the circulating pump is connected with the liquid outlet of the preparation tank, the outlet end of the circulating pump is connected with a melt pipeline, and one end of a die head of a granulator of the melt pipeline is connected with the liquid inlet of the preparation tank through a return pipe so as to form alkali liquor circulation;
the screen changer is arranged on the melt pipeline and is used for filtering alkali liquor;
the liquid leakage receiving groove is arranged below the screen changer and is connected with a liquid inlet of the preparation groove through a liquid return pipe, and the liquid leakage receiving groove is used for collecting leaked alkali liquid;
the heating mechanism is arranged in the preparation tank and is used for heating the alkali liquor.
2. The apparatus according to claim 1, wherein a Y-filter is provided between the circulation pump and the preparation tank.
3. The apparatus for cleaning a conduit of a tackifying system for biodegradable resins according to claim 1, wherein the outlet end of the circulating pump is connected with a booster pump.
4. The apparatus for cleaning a piping of a biodegradable resin tackifying system according to claim 1, wherein said preparation tank is provided with a level gauge.
5. The method for cleaning the pipeline of the biodegradable resin tackifying system is characterized by comprising the following steps of:
starting a heating mechanism to heat water in the preparation tank, and adding sodium hydroxide to prepare alkali liquor;
enabling alkali liquor to enter a melt pipeline through a circulating pump, and then refluxing from a die head of the granulator to a preparation tank for circulating alkali washing;
cooling after cleaning, and cleaning alkali liquor in the melt pipeline by using clear water;
blowing the melt pipe with compressed air until the discharged water is detected to be neutral;
and (3) purging the melt pipeline by using steam, and cleaning the dead angle after the alkali liquor is thoroughly removed.
6. The method for cleaning a pipeline of a tackifying system for biodegradable resins according to claim 5, wherein the temperature of the alkaline solution is 90-100 ℃ in the process of circulating alkaline washing.
7. The method for cleaning a pipeline of a tackifying system for biodegradable resins according to claim 5, wherein the alkali solution is prepared by adding sodium hydroxide when water is heated to 50 ℃.
8. The method for cleaning a pipeline of a biodegradable resin adhesion promotion system according to claim 5, wherein the concentration of the alkali solution is 20% -25%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310679478.0A CN116851368A (en) | 2023-06-08 | 2023-06-08 | Device and method for cleaning biodegradable resin tackifying system pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310679478.0A CN116851368A (en) | 2023-06-08 | 2023-06-08 | Device and method for cleaning biodegradable resin tackifying system pipeline |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116851368A true CN116851368A (en) | 2023-10-10 |
Family
ID=88231155
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310679478.0A Pending CN116851368A (en) | 2023-06-08 | 2023-06-08 | Device and method for cleaning biodegradable resin tackifying system pipeline |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116851368A (en) |
-
2023
- 2023-06-08 CN CN202310679478.0A patent/CN116851368A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110964188B (en) | Production method of cyclic regeneration cation slice | |
| CN102952019B (en) | Dioctyl phthalate production line and DOTP production method | |
| CN110538481B (en) | Phenol continuous extraction system, polycarbonate resin production system comprising phenol continuous extraction system and production method | |
| EP2123705B1 (en) | Method for separation/removal of foreign material from polyester fiber waste | |
| CN116851368A (en) | Device and method for cleaning biodegradable resin tackifying system pipeline | |
| CN102086251B (en) | Continuous alkali washing method of C5 petroleum resin | |
| CN210434480U (en) | High-efficient hydrogenation unit of production hexamethylene diamine piperidine | |
| CN112321122A (en) | Filtering method for filter pressing treatment of dehydration membrane of sludge filter press | |
| CN103664629A (en) | Nitrobenzene washing and separating system | |
| WO2024012518A1 (en) | Production process and device for continuously producing 5-hydroxymethylfurfural | |
| CN103658121B (en) | Device and method for cleaning pipelines for cationic polyester melts | |
| CN201884243U (en) | Vacuum pump continuous cleaning device | |
| JP4344621B2 (en) | Cleaning method for inorganic materials | |
| CN102219924A (en) | Device for separating cotton-polyester blended fabrics and repolymerizing polyester | |
| CN215918508U (en) | Polyester fuse pipeline cleaning system | |
| CN220591006U (en) | Self-cleaning system of urine washing tower | |
| CN101993715B (en) | Vacuum regeneration method of butyl rubber clean solvent oil | |
| CN220737557U (en) | Steam kettle washing system for experimental biodegradation polymerization device | |
| CN211189219U (en) | Settling tank for continuously removing falling powder of palladium-carbon catalyst | |
| CN217989775U (en) | Online cleaning system for vacuum jet pump nozzle | |
| CN220989988U (en) | Promote production stability's acetaldehyde recovery waste water utilization equipment | |
| CN210683648U (en) | Continuous polymerization system of C5/C9 copolymerized petroleum resin | |
| CN215654035U (en) | Automatic alcohol recovery filtration equipment of unloading | |
| CN220478823U (en) | Boiler cleaning agent processing reaction kettle | |
| CN220549512U (en) | Chemical industry storage tank with hydrologic cycle self-heating |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |