CN103817120B - The sticky wall method for cleaning of polyethylene from high pressure process tubular reactor - Google Patents
The sticky wall method for cleaning of polyethylene from high pressure process tubular reactor Download PDFInfo
- Publication number
- CN103817120B CN103817120B CN201410069563.6A CN201410069563A CN103817120B CN 103817120 B CN103817120 B CN 103817120B CN 201410069563 A CN201410069563 A CN 201410069563A CN 103817120 B CN103817120 B CN 103817120B
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- China
- Prior art keywords
- reaction tube
- solvent naphtha
- polyethylene
- high pressure
- tubular reactor
- Prior art date
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Links
- 238000000034 method Methods 0.000 title claims abstract description 56
- 239000004698 Polyethylene Substances 0.000 title claims abstract description 36
- -1 polyethylene Polymers 0.000 title claims abstract description 36
- 229920000573 polyethylene Polymers 0.000 title claims abstract description 36
- 238000004140 cleaning Methods 0.000 title claims abstract description 23
- 238000006243 chemical reaction Methods 0.000 claims abstract description 41
- 239000002904 solvent Substances 0.000 claims abstract description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 239000002184 metal Substances 0.000 claims description 4
- 229920000642 polymer Polymers 0.000 abstract description 9
- 239000000463 material Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 239000007863 gel particle Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 239000002699 waste material Substances 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cleaning In General (AREA)
Abstract
The invention provides a kind of sticky wall method for cleaning of polyethylene from high pressure process tubular reactor, comprising: in the reaction tube of polyethylene from high pressure process tubular reactor, pass into solvent naphtha; Solvent naphtha in reaction tube is heated to predetermined solution temperature and maintains a scheduled time; Solvent naphtha in reaction tube is discharged.The present invention by passing into solvent naphtha in the reaction tube of polyethylene from high pressure process tubular reactor, this solvent naphtha is heated to predetermined temperature and maintains a scheduled time, the high molecular polymer adhered in reaction tube can be made to be dissolved in solvent naphtha, and finally these high molecular polymers are discharged with solvent naphtha.More difficult problem cleared up by the sticky wall that the present invention solves in polyethylene from high pressure process tubular reactor more easily.
Description
Technical field
The present invention relates to polyethylene from high pressure process tubular reactor, more specifically, relate to a kind of sticky wall method for cleaning of polyethylene from high pressure process tubular reactor.
Background technology
The higher polymer of relative molecular mass can be produced when polymerisation, because these polymer molecular weights are high, poor fluidity, so, be easy on the inwall of the reaction tube being bonded at polyethylene from high pressure process tubular reactor.If the situation of sticky wall is more serious, not only can reduce the production efficiency of polyethylene from high pressure process tubular reactor, the heat exchange efficiency of reaction tube also can be caused sharply to decline, and then reaction heat can not be shifted out in time, thus easily make reaction temperature sharply increase, thus add the probability of thermal decomposition.
In addition, sticky wall material essence is a kind of polyethylene byproduct of HMW, it in the reactor the time of staying longer after can be cross-linked on the reactor wall, finally form the gel particles in product, cause existing more " flake " in final coating materials polyethylene product, have a strong impact on product quality.
At present, that commonly uses has the mode that polyethylene from high pressure process tubular reactor is cleared up:
Parking machinery is torn open clearly: this needs the parts such as flange, pressure piping first dismantled on polyethylene from high pressure process tubular reactor, then, cleans separately after reaction tube being placed in special oil cauldron thermophilic digestion again.Because this mode can waste a large amount of human and material resources and financial resources, so, usually only adopt when device general overhaul.
Hand scarf: by raising the temperature of the water in the chuck of polyethylene from high pressure process tubular reactor, reduce the flow of the water in chuck, and then raise heat transfer temperature difference, regulate the amount removed of reaction heat, thus reach the object removing sticky wall material.This most generally uses at present, but not thorough to the inner wall cleaning of reaction tube of this mode.
Summary of the invention
The present invention aims to provide a kind of sticky wall method for cleaning of polyethylene from high pressure process tubular reactor, to solve the problem of the more difficult cleaning of high molecular polymer that the polyethylene from high pressure process tubular reactor of prior art is adhered.
For solving the problems of the technologies described above, the invention provides a kind of sticky wall method for cleaning of polyethylene from high pressure process tubular reactor, comprising: in the reaction tube of polyethylene from high pressure process tubular reactor, passing into solvent naphtha; Solvent naphtha in reaction tube is heated to predetermined solution temperature and maintains a scheduled time; Solvent naphtha in reaction tube is discharged.
Further, sticky wall method for cleaning comprises: heat across the water in pipe the hot water jacket of polyethylene from high pressure process tubular reactor, thus the solvent naphtha in heating reaction tube.
Further, pass into solvent naphtha in reaction tube before, polyethylene from high pressure process tubular reactor method for cleaning also comprises: sealed at the two ends of reaction tube.
Further, predetermined solution temperature is 180 degrees Celsius.
Further, the scheduled time is 15 little of 20 hours.
Further, before being discharged by the solvent naphtha in reaction tube, sticky wall method for cleaning also comprises: the solvent naphtha in reaction tube is cooled to predetermined chilling temperature.
Further, predetermined chilling temperature is less than 50 degrees Celsius.
The present invention by passing into solvent naphtha in the reaction tube of polyethylene from high pressure process tubular reactor, this solvent naphtha is heated to predetermined temperature and maintains a scheduled time, the high molecular polymer adhered in reaction tube can be made to be dissolved in solvent naphtha, and finally these high molecular polymers are discharged with solvent naphtha.More difficult problem cleared up by the sticky wall that the present invention solves in polyethylene from high pressure process tubular reactor more easily.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 diagrammatically illustrates the flow chart of the sticky wall method for cleaning of the polyethylene from high pressure process tubular reactor in the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, embodiments of the invention are described in detail, but the multitude of different ways that the present invention can be defined by the claims and cover is implemented.
The invention provides a kind of sticky wall method for cleaning of polyethylene from high pressure process tubular reactor, please refer to Fig. 1, the method comprises: in the reaction tube of polyethylene from high pressure process tubular reactor, pass into solvent naphtha; Solvent naphtha in reaction tube is heated to predetermined solution temperature and maintains a scheduled time; Solvent naphtha in reaction tube is discharged.
The present invention by passing into solvent naphtha in the reaction tube of polyethylene from high pressure process tubular reactor, this solvent naphtha is heated to predetermined temperature and maintains a scheduled time, the high molecular polymer adhered in reaction tube can be made to be dissolved in solvent naphtha, and finally these high molecular polymers are discharged with solvent naphtha.More difficult problem cleared up by the sticky wall that the present invention solves in polyethylene from high pressure process tubular reactor more easily.
Preferably, sticky wall method for cleaning comprises: heat across the water in pipe the hot water jacket of polyethylene from high pressure process tubular reactor, thus the solvent naphtha in heating reaction tube.By can more easily the solvent naphtha in retort be heated across the hot water heating in pipe the hot water jacket of polyethylene from high pressure process tubular reactor.
Preferably, pass into solvent naphtha in reaction tube before, polyethylene from high pressure process tubular reactor method for cleaning also comprises: sealed at the two ends of reaction tube.Preferably, German-style metal lensring blind flange is utilized to seal the two ends of reaction tube.Preferably, showering guilding valve is set in the lower position of German-style metal lensring blind flange in the exit being positioned at polyethylene from high pressure process tubular reactor, and connects oil guide pipe on showering guilding valve.
Preferably, predetermined solution temperature is 180 degrees Celsius.
Preferably, the scheduled time is 15 little of 20 hours.
Preferably, before being discharged by the solvent naphtha in reaction tube, sticky wall method for cleaning also comprises: the solvent naphtha in reaction tube is cooled to predetermined chilling temperature.
Preferably, predetermined chilling temperature is less than 50 degrees Celsius.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. a sticky wall method for cleaning for polyethylene from high pressure process tubular reactor, is characterized in that, comprising:
Solvent naphtha is passed in the reaction tube of described polyethylene from high pressure process tubular reactor;
Solvent naphtha in described reaction tube is heated to predetermined solution temperature and maintains a scheduled time;
Solvent naphtha in described reaction tube is discharged, wherein,
Pass into solvent naphtha in described reaction tube before, described polyethylene from high pressure process tubular reactor method for cleaning also comprises:
German-style metal lensring blind flange is utilized to be sealed at the two ends of described reaction tube;
Showering guilding valve is set in the lower position of described German-style metal lensring blind flange, and connects oil guide pipe on described showering guilding valve;
Before being discharged by solvent naphtha in described reaction tube, described sticky wall method for cleaning also comprises:
Solvent naphtha in described reaction tube is cooled to predetermined chilling temperature, and described predetermined chilling temperature is less than 50 degrees Celsius.
2. sticky wall method for cleaning according to claim 1, is characterized in that, described sticky wall method for cleaning comprises:
The hot water jacket of described polyethylene from high pressure process tubular reactor is heated across the water in pipe, thus heats the solvent naphtha in described reaction tube.
3. sticky wall method for cleaning according to claim 1, is characterized in that, described predetermined solution temperature is 180 degrees Celsius.
4. sticky wall method for cleaning according to claim 1, is characterized in that, the described scheduled time is 15 little of 20 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410069563.6A CN103817120B (en) | 2014-02-27 | 2014-02-27 | The sticky wall method for cleaning of polyethylene from high pressure process tubular reactor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410069563.6A CN103817120B (en) | 2014-02-27 | 2014-02-27 | The sticky wall method for cleaning of polyethylene from high pressure process tubular reactor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103817120A CN103817120A (en) | 2014-05-28 |
| CN103817120B true CN103817120B (en) | 2016-04-27 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410069563.6A Active CN103817120B (en) | 2014-02-27 | 2014-02-27 | The sticky wall method for cleaning of polyethylene from high pressure process tubular reactor |
Country Status (1)
| Country | Link |
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| CN (1) | CN103817120B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BR112018072496B1 (en) | 2016-05-10 | 2022-10-25 | Basell Polyolefine Gmbh | HIGH PRESSURE POLYMERIZATION PROCESS OF ETHYLENICLY UNSATURATED MONOMERS IN A PRODUCTION LINE THAT HAS FLANGES COVERED BY A CHIMNEY CONSTRUCTION |
| CN108082767A (en) * | 2017-12-18 | 2018-05-29 | 合肥海川石化设备有限公司 | A kind of deep submersible electric pump is with motor water pressure test tank exhaust apparatus |
| CN113000498A (en) * | 2021-03-01 | 2021-06-22 | 浙江大学 | Cleaning method for high-pressure tubular polyethylene reaction system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101237924A (en) * | 2005-08-10 | 2008-08-06 | 林德股份公司 | Method for cleaning reactor |
| CN201959798U (en) * | 2011-01-19 | 2011-09-07 | 颜建平 | Tubular polymerization reactor |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009095809A (en) * | 2007-10-19 | 2009-05-07 | Jfe Chemical Corp | Removing method and apparatus for deposited sludge in storage tank |
| CN202176553U (en) * | 2011-08-18 | 2012-03-28 | 唐山三友化工股份有限公司 | Online cleaning device of centrifugal compressor |
-
2014
- 2014-02-27 CN CN201410069563.6A patent/CN103817120B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101237924A (en) * | 2005-08-10 | 2008-08-06 | 林德股份公司 | Method for cleaning reactor |
| CN201959798U (en) * | 2011-01-19 | 2011-09-07 | 颜建平 | Tubular polymerization reactor |
Non-Patent Citations (3)
| Title |
|---|
| LDPE管式工艺物料粘壁原因分析及处理;朱国庆;《合成树脂及塑料》;20100130(第1期);第36-38页 * |
| 影响高压聚乙烯产品质量的因素分析及对策;唐玲;《甘肃科技》;20130831;第29卷(第15期);全文 * |
| 超高压管式反应器的检验和维护;李秀波;《化工科技》;20101230(第6期);全文 * |
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| Publication number | Publication date |
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| CN103817120A (en) | 2014-05-28 |
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