CN103013548A - Method for recovery of asphalt from asphalt mixture - Google Patents
Method for recovery of asphalt from asphalt mixture Download PDFInfo
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- CN103013548A CN103013548A CN2012105222729A CN201210522272A CN103013548A CN 103013548 A CN103013548 A CN 103013548A CN 2012105222729 A CN2012105222729 A CN 2012105222729A CN 201210522272 A CN201210522272 A CN 201210522272A CN 103013548 A CN103013548 A CN 103013548A
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- asphalt
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- bituminous solution
- distillation
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- 239000010426 asphalt Substances 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 47
- 239000000203 mixture Substances 0.000 title claims abstract description 11
- 238000011084 recovery Methods 0.000 title abstract description 16
- 238000004821 distillation Methods 0.000 claims abstract description 31
- 239000000706 filtrate Substances 0.000 claims abstract description 18
- 239000003365 glass fiber Substances 0.000 claims abstract description 14
- 239000002904 solvent Substances 0.000 claims abstract description 14
- 238000001914 filtration Methods 0.000 claims abstract description 13
- 239000011521 glass Substances 0.000 claims abstract description 9
- 238000007789 sealing Methods 0.000 claims abstract description 8
- 238000006243 chemical reaction Methods 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 10
- 230000001681 protective effect Effects 0.000 claims description 7
- 238000009833 condensation Methods 0.000 claims description 4
- 230000005494 condensation Effects 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 230000032683 aging Effects 0.000 abstract description 14
- 238000012360 testing method Methods 0.000 abstract description 10
- 238000001514 detection method Methods 0.000 abstract description 5
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 5
- 239000011707 mineral Substances 0.000 abstract description 5
- 239000000843 powder Substances 0.000 abstract description 5
- 238000003915 air pollution Methods 0.000 abstract description 3
- 238000001944 continuous distillation Methods 0.000 abstract 1
- 239000011295 pitch Substances 0.000 description 53
- 230000000052 comparative effect Effects 0.000 description 14
- 238000001556 precipitation Methods 0.000 description 5
- 238000004062 sedimentation Methods 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 4
- 238000000703 high-speed centrifugation Methods 0.000 description 4
- 238000002329 infrared spectrum Methods 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- XSTXAVWGXDQKEL-UHFFFAOYSA-N Trichloroethylene Chemical compound ClC=C(Cl)Cl XSTXAVWGXDQKEL-UHFFFAOYSA-N 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
- 230000003292 diminished effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000011301 petroleum pitch Substances 0.000 description 3
- 230000005526 G1 to G0 transition Effects 0.000 description 2
- 238000005119 centrifugation Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- Working-Up Tar And Pitch (AREA)
Abstract
The invention provides a method for recovery of asphalt from an asphalt mixture so as to facilitate subsequent asphalt performance detection. The method comprises the steps of: extracting an asphalt solution, placing the extracted asphalt solution in a glass container, conducting sealing and standing for at least 1h to obtain an upper layer asphalt solution, filtering the upper layer asphalt solution on glass fiber filter paper in a pressure reduced filter, and reserving an asphalt solution filtrate; carrying out continuous distillation on the asphalt solution filtrate obtained in the last step according to an Abson method at a temperature of 133-137DEG C till that the solvent stops dripping, and further performing distillation for 2h, thus obtaining recovered asphalt. On the bases of avoiding mineral powder and solvent residual and asphalt aging, the method for recovery of asphalt from the asphalt mixture involved in the invention substantially improves the test operability and practicability of asphalt recovery, and reduces the air pollution problem, thus having great promotion value.
Description
Technical field
The invention belongs to asphalt highway detection technique field, be specifically related to a kind of method that from asphalt, reclaims pitch, so that the follow-up asphalt performance that carries out detects.
Background technology
Along with the development of asphalt-regenerating technology with widely popularize, from bituminous pavement or asphalt, reclaim pitch and carry out Performance Detection, become a kind of test method commonly used, its obtained experimental result can be for the degree of aging of evaluation petroleum pitch compound medium pitch, and the destruction reason of analyzing bituminous pavement, carry out the regeneration of aged asphalt and the uses such as mix-design of compound.But in the bitumen recovery process, variety of issue highlights, as reclaim residual breeze and solvent in the pitch, the pitch problem such as aging in detecting process of the test, if the pitch that reclaims from asphalt can not reflect the actual performance of asphalt medium pitch, bring misleading then for asphalt-regenerating and mix proportion design, certainly will affect the military service performance and used life of reclaimed bituminous pavement.
" highway engineering pitch and Asphalt Mixture Experiment rules " are though there is bitumen recovery process (T0726 Abson method) among the JTG E20-2011, but there is following problem in the method: (1) the method is carried out high speed centrifugation to asphalt extraction liquid and is separated, if adopt the half auto centrifuge separator repeatedly to separate, operating process is very loaded down with trivial details and be difficult to avoid breeze residual, adopts equally full-automatic extracting separometer also to be difficult to avoid this problem; (2) the method is in still-process, and distillation temperature (in the flask) remains 160-166 ℃, and very easily causes ageing of asphalt under this temperature; (3) the method is defined in and is distilled to solvent and stops after lower 5min and finish test and obtain to reclaim pitch, but more residual fewer to final solvent, more is difficult for distilling out, and just finishes test and only postpone 5min, has unavoidably the dissolvent residual problem; (4) matrass that uses of the method is 500ml, the actual bituminous solution of containing only is 350 ~ 400ml, according to conventional extracting can calculate 400ml bituminous solution Asphalt Content at most only 30g pitch (according to 1500 asphalts, bitumen aggregate ratio 5%, extract is 1000ml at least), and when so a small amount of pitch takes out from distilling flask, be bonded on the flask walls because of part pitch again, obtain at last in the pitch very few, nearly 200g calculates according to the required pitch of the basic three norms of pitch, at least need Distillation recovery 10 times, the complex operation degree is well imagined.
Improve reclaiming the pitch method among the publication CN 102728095A, but the bituminous solution that distills in this patent is from leaving standstill the extract upper strata, still there is the residual hidden danger of breeze in this bituminous solution, it at first is superfine mineral powder floating in the solution, next be between solution and the lower sediment the transition layer breeze fully the precipitation, when getting upper solution, take out with bituminous solution unavoidably.In addition, this patent is placed on pitch in the baking oven evaporates, and has environmental issue, and the solvent that evaporates in baking oven will enter atmosphere naturally, causes air pollution problems inherent.
Summary of the invention
The present invention is directed to the problem that existing bitumen recovery process exists, a kind of method that reclaims pitch from asphalt be provided, its customer service the deficiency that exists of existing recovery technology, improved accuracy and the practicality of bitumen recovery and performance measuring and evaluating.
The invention provides a kind ofly when avoiding breeze, dissolvent residual and ageing of asphalt, from asphalt, reclaim the method for pitch; Comprise the steps:
A. bituminous solution extracting: the used for asphalt mixture centrifugal separation is extracted bituminous solution, bituminous solution is placed Glass Containers, sealing and standing at least 1 hour is got the upper strata bituminous solution, filters with glass fiber filter paper, keeps filtrate;
B. bituminous solution distillation: the filtrate of step a gained is distilled under protective atmosphere in reaction vessel according to Abson method, the air outlet of protective atmosphere places the bottom of reaction vessel, distillation temperature is 135 ± 2 ℃, treat filtrate is distilled at 2/1/3rds to three o'clock that distill front filtrate volume, continue to add filtrate, the amount that maximum accumulative totals are added bituminous solution depends on the number of the described air outlet in the reaction vessel and the thickness of pitch, the spacing of each described air outlet is less than or equal to 5.5cm, the thickness of pitch is less than or equal to 4.5cm, the solvent of the filtrate that distills out is through being condensed into liquid, after being distilled to lower of condensation place absence of liquid, continue to obtain to reclaim pitch behind the distillation 2h; The flow of described protective atmosphere is 1800 ± 50ml/min, and after lower of condensation place absence of liquid, gas flow increases to 2500 ± 50ml/min.
Used centrifugal separation that bituminous solution is extracted from asphalt mixture in the step (a) is according to T 0722 method among " highway engineering pitch and Asphalt Mixture Experiment rules " JTG E20-2011.
Sealing and standing is at least 1 hour in the step (a), to make the macrobead precipitation, subparticle does not have or partly precipitated, not yet to leaving standstill final layering stationary phase, filtered before stationary phase in static layering, can save required time of operation, the subparticle of retaining in the bituminous solution of upper strata filtering during to follow-up glass filter paper filtering.
In the step (b), the amount that maximum accumulative totals are added bituminous solution depends on the number of the described air outlet in the reaction vessel and the thickness of pitch, if the air outlet spacing is greater than 5.5cm, or the thickness of pitch is during greater than 4.5cm, even it is also of no avail to increase the protective atmosphere flow, major cause is, the pitch amount is large, when fewer and feweri to final solvent, the pitch aggregate amount in the reaction vessel is large, and asphalt viscosity increases severely; Shield gas flow rate is large again, can not overflow by the state with little continuous air bubbles from the pitch of assembling, and namely shielding gas does not have the effect of protection, does not stop ageing of asphalt.
The present invention adopts the bituminous solution to the extracting gained to leave standstill at least to get upper solution behind the 1h and filters with glass fiber filter paper, precipitation adds filtration and has substituted the high speed centrifugation separating step, avoided centrifugal test to repeat in a large number loaded down with trivial details operation steps, and compare with the sedimentation 24h of CN 102728095 A and greatly to have shortened test period, and avoid breeze to remain in the bituminous solution.
Secondly, in still-process, constantly in matrass, add bituminous solution, can disposable acquisition more reclaim pitch, greatly reduce the distillation test number of times, significantly improve the practicality and the operability that reclaim asphalt operation, and distillation temperature is controlled at 135 ± 2 ℃, guarantees that pitch is not aging.
At last, after being distilled to no longer lower of solvent, continue distillation 2h, can guarantee the solvent noresidue, compare in drying in oven with CN 102728095 A, reduced atmospheric pollution.
For further improving accuracy and the practicality of this invention, operation steps is further optimized:
Before asphalt is carried out extracting: remove macroscopic foreign material in the asphalt, and oven dry asphalt to its water ratio is lower than 0.1%.Remove macroscopic foreign material in the asphalt, blocked to avoid in subsequent processing steps glass filter paper; Reduce the water ratio of asphalt, be convenient to extract purer bituminous solution, reduce that the solvent in the bituminous solution is distilled out of the required time under the follow-up distillation temperature, reduce pitch aging probability occurs.
The temperature of described oven dry asphalt is 60-90 ℃.It is aging to guarantee can not cause pitch to occur when the oven dry asphalt.
When bituminous solution leaves standstill, for avoiding solvent evaporates, use the dark glass container to contain bituminous solution.
In the bituminous solution filtration procedure, keep the thickness of the breeze that adheres on the glass fiber filter paper less than 0.5 μ m; In case the breeze thickness that adheres on the glass fiber filter paper more than or equal to 0.5 μ m, more renews filter paper immediately, to guarantee filtration velocity.
During the bituminous solution distillation: the flask that is used for distillation is four-hole or the above reaction vessel of four-hole, and each mouth connects respectively prolong, thermometer, ventpipe and funnel; Can in still-process, continue to add bituminous solution along funnel; When not adding bituminous solution, take off corresponding mouthful of funnel sealing.
The method that from asphalt, reclaims pitch of the present invention, avoiding on breeze, dissolvent residual and the ageing of asphalt basis, greatly improved and reclaimed test operability and the practicality of pitch, and reduced air pollution problems inherent, had good promotional value.
Description of drawings
Fig. 1: distillation temperature is different, the recovery pitch that obtains and the infrared spectra comparison diagram of former matrix.
Fig. 2: the time of lag of research distillation is different, the recovery pitch that obtains and the infrared spectra comparison diagram of former matrix.
Embodiment
Three kinds of effect and efficient except the breeze method have been contrasted.Test as example to process 1000ml asphalt extraction liquid, embodiment 1 gets the upper strata bituminous solution and filters in the glass fiber filter paper of vacuum filter for bituminous solution is placed sealing and standing 1h in the dark glass container, obtains filtering rear bituminous solution.
Comparative Examples 1 places centrifugation in the supercentrifuge for the bituminous solution that the asphalt extracting is obtained, and gets supernatant liquid.
Comparative Examples 2 is got the upper strata bituminous solution for behind the sedimentation 24h.
Respectively to above three kinds of bituminous solutions that method obtains, adopt on the filter paper of vacuum filter and filter, bleed on one side that it is clean to add new trieline solution on the filter paper, whether examine on the filter paper residual mineral powder granular, and record test required time, the results are shown in Table shown in 1.
After embodiment carried out sedimentation 1h to the bituminous solution of extracting, a large amount of breezes sank, lingering section superfine mineral powder only in the solution, adopt the glass fiber filter paper filtration velocity fast, and thoroughly remove breeze, so the 1h sedimentation adds 1h and filters, and altogether needs 2h to finish breeze removal work.
Comparative Examples 1 has adopted the high speed centrifugation analytical method, and namely existing common method follows separator tube to calculate to have 10 in the supercentrifuge, every 10ml, the 1000ml bituminous solution need at least to carry out 10 times centrifugal, each centrifugal at least 30min, then altogether needing at least 300min is 5h.
Comparative Examples 2 adopts sedimentation 24h method, although the method has been avoided the centrifugation operating process, the superfine mineral powder in the solution and solution and throw out breeze at the interface all can be along with bituminous solution enters next step together, and required time is 24h.
Table 1
| Example | Except the breeze process | Except breeze required time/h | The breeze detection method | The breeze detected |
| Embodiment | ||||
| 1 | Glass fiber filter paper is filtered behind the precipitation 1h | 2 | The employing filtration under diminished pressure detects | Nothing |
| Comparative Examples 1 | High speed centrifugation separates | 5 | The employing filtration under diminished pressure detects | Have |
| Comparative Examples 2 | Precipitation 24h | 24 | The employing filtration under diminished pressure detects | Have |
Embodiment 2:
Whether the comparative study distillation temperature causes is reclaimed the aging of pitch.Accurately take by weighing 100g70 petroleum pitch, pouring the 400g trieline into fully dissolves pitch, Distillation recovery pitch method according to T 0726-2011 in " highway engineering pitch and Asphalt Mixture Experiment rules " (JTG E20-2011) is carried out, the distillation temperature of embodiment is 135 ± 2 ℃, the Comparative Examples distillation temperature is 163 ± 3 ℃, the recovery pitch that obtains and former matrix are done respectively infrared spectra detect, the determination and analysis result see Table respectively 2 and accompanying drawing 1 shown in.
Table 2
| Example | Distillation temperature/℃ | Detection method | Detected result |
| Embodiment 2 | 135±2 | Infrared | Unaged |
| Comparative Examples 3 | 163±3 | Infrared | Aging |
Example 3:
The time of lag of comparative study distillation is on the impact of pitch and performance thereof.
Accurately take by weighing 100g70 petroleum pitch, pouring the 400g trieline into fully dissolves pitch, Distillation recovery pitch method according to T 0726-2011 in " highway engineering pitch and Asphalt Mixture Experiment rules " (JTG E20-2011) is carried out, but distillation temperature is 135 ± 2 ℃, be 2h the time of lag of embodiment distillation, Comparative Examples is respectively 1h, 4h and 8h, to the recovery pitch and the former matrix that obtain do infrared spectra, three large basic indexs detect, analysis and detected result see Table respectively 3, shown in table 4 and the accompanying drawing 2.
Table 3
Table 4
Embodiment 4:
Comparative study continues to add bituminous solution to obtaining the impact of pitch amount.
The bituminous solution that extracting is obtained, place the dark glass container, sealing and standing 5h, getting upper solution places the glass fiber filter paper of vacuum filter to filter, the filtrate that filtration obtains is adopted 135 ± 2 ℃ of distillations, embodiment is in still-process, when distilling, solution continues to add bituminous solution filtrate about half, it is 2700ml that accumulative total is filtered liquid measure, Comparative Examples was no longer added bituminous solution filtrate in this process, all to continue time of lag after dripping be 2h when solvent no longer is, and is recycled pitch, reclaims pitch amount (not comprising the pitch that is bonded on the matrass wall) and ageing of asphalt and whether be shown in Table 5.
Table 5
| Example | Removal process | Bituminous solution filtrate is always measured/ml | Obtain pitch amount/g | Whether pitch is aging |
| Embodiment 4 | Glass fiber filter paper is filtered, and 135 ± 2 ℃ of distillations postpone 2h | 2700 | 190 | No |
| Comparative Examples 7 | Glass fiber filter paper is filtered, and 135 ± 2 ℃ of distillations postpone 2h | 400 | 20 | No |
Claims (6)
1. a method that reclaims pitch from asphalt is characterized in that comprising the steps:
A. bituminous solution extracting: the used for asphalt mixture centrifugal separation is extracted bituminous solution, bituminous solution is placed Glass Containers, sealing and standing at least 1 hour is got the upper strata bituminous solution, filters with glass fiber filter paper, keeps filtrate;
B. bituminous solution distillation: the filtrate of step a gained is distilled under protective atmosphere in reaction vessel according to Abson method, the air outlet of protective atmosphere places the bottom of reaction vessel, distillation temperature is 135 ± 2 ℃, treat filtrate is distilled at 2/1/3rds to three o'clock that distill front filtrate volume, continue to add filtrate, the amount that maximum accumulative totals are added bituminous solution depends on the number of the described air outlet in the reaction vessel and the thickness of pitch, the spacing of each described air outlet is less than or equal to 5.5cm, the thickness of pitch is less than or equal to 4.5cm, the solvent of the filtrate that distills out is through being condensed into liquid, after being distilled to lower of condensation place absence of liquid, continue to obtain to reclaim pitch behind the distillation 2h; The flow of described protective atmosphere is 1800 ± 50ml/min, and after lower of condensation place absence of liquid, gas flow increases to 2500 ± 50ml/min.
2. the method that reclaims pitch from asphalt according to claim 1 is characterized in that: before asphalt is carried out extracting: remove macroscopic foreign material in the asphalt, and oven dry asphalt to its water ratio is lower than 0.1%.
3. the method that reclaims pitch from asphalt according to claim 2, it is characterized in that: the temperature of described oven dry asphalt is 60-90 ℃.
4. the method that reclaims pitch from asphalt according to claim 1 is characterized in that: when bituminous solution leaves standstill, use the dark glass container to contain bituminous solution.
5. the method that reclaims pitch from asphalt according to claim 1 is characterized in that: in the bituminous solution filtration procedure, keep the thickness of the breeze that adheres on the glass fiber filter paper less than 0.5 μ m; In case the breeze thickness that adheres on the glass fiber filter paper more than or equal to 0.5 μ m, more renews filter paper immediately.
6. the method that from asphalt, reclaims pitch according to claim 1, it is characterized in that: during the bituminous solution distillation: the flask that is used for distillation is four-hole or the above reaction vessel of four-hole, and each mouth connects respectively prolong, thermometer, ventpipe and funnel; In still-process, continue to add bituminous solution along funnel; When not adding bituminous solution, take off corresponding mouthful of funnel sealing.
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| CN201210522272.9A CN103013548B (en) | 2012-12-07 | 2012-12-07 | Method for recovery of asphalt from asphalt mixture |
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| CN201210522272.9A CN103013548B (en) | 2012-12-07 | 2012-12-07 | Method for recovery of asphalt from asphalt mixture |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103696345A (en) * | 2013-12-20 | 2014-04-02 | 柳州联海科技有限公司 | Method for recycling asphalt from asphalt mixture |
| CN103711058A (en) * | 2013-12-10 | 2014-04-09 | 柳州博泽科技有限公司 | Process for recycling asphalt from asphalt mixture |
| CN104531193A (en) * | 2014-12-19 | 2015-04-22 | 重庆鹏方交通科技股份有限公司 | Method for recycling asphalt from asphalt mixture |
| CN105176559A (en) * | 2015-09-30 | 2015-12-23 | 沈阳建筑大学 | Device and method for quickly recovering waste asphalt from waste asphalt pavement material |
| CN105885084A (en) * | 2014-11-21 | 2016-08-24 | 吉林省嘉鹏建设集团有限公司 | Separation extracting method of purified aged asphalt |
| CN105880258A (en) * | 2016-03-25 | 2016-08-24 | 北京盛广拓公路科技有限公司 | Method for extracting asphalt from waste of asphalt pavement |
| CN108169465A (en) * | 2017-12-15 | 2018-06-15 | 扬州大学 | The recovery method of aged asphalt in bituminous paving milling material |
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| CN106814181B (en) * | 2016-12-16 | 2019-04-05 | 河海大学 | One kind specific surface of aggregate removing recycling bitumen samples method from asphalt |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103711058A (en) * | 2013-12-10 | 2014-04-09 | 柳州博泽科技有限公司 | Process for recycling asphalt from asphalt mixture |
| CN103696345A (en) * | 2013-12-20 | 2014-04-02 | 柳州联海科技有限公司 | Method for recycling asphalt from asphalt mixture |
| CN105885084A (en) * | 2014-11-21 | 2016-08-24 | 吉林省嘉鹏建设集团有限公司 | Separation extracting method of purified aged asphalt |
| CN105885084B (en) * | 2014-11-21 | 2019-04-23 | 吉林省嘉鹏建设集团有限公司 | A kind of extraction method purifying aged asphalt |
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| CN105176559A (en) * | 2015-09-30 | 2015-12-23 | 沈阳建筑大学 | Device and method for quickly recovering waste asphalt from waste asphalt pavement material |
| CN105176559B (en) * | 2015-09-30 | 2018-10-23 | 沈阳建筑大学 | The device and method of Bituminous concrete surface in a kind of quick recycling waste asphalt pavement material |
| CN105880258A (en) * | 2016-03-25 | 2016-08-24 | 北京盛广拓公路科技有限公司 | Method for extracting asphalt from waste of asphalt pavement |
| CN105880258B (en) * | 2016-03-25 | 2018-09-25 | 北京盛广拓公路科技有限公司 | A kind of old material of asphalt pavement bitumen extraction method |
| CN108169465A (en) * | 2017-12-15 | 2018-06-15 | 扬州大学 | The recovery method of aged asphalt in bituminous paving milling material |
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| CN103013548B (en) | 2014-08-06 |
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