CN103834421A - Environment-friendly type modified coal asphalt and preparation method thereof - Google Patents
Environment-friendly type modified coal asphalt and preparation method thereof Download PDFInfo
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- CN103834421A CN103834421A CN201410110270.8A CN201410110270A CN103834421A CN 103834421 A CN103834421 A CN 103834421A CN 201410110270 A CN201410110270 A CN 201410110270A CN 103834421 A CN103834421 A CN 103834421A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 21
- 239000010426 asphalt Substances 0.000 title abstract description 13
- 239000003245 coal Substances 0.000 title abstract description 8
- 239000012046 mixed solvent Substances 0.000 claims abstract description 27
- 238000003756 stirring Methods 0.000 claims abstract description 22
- 239000000203 mixture Substances 0.000 claims abstract description 12
- 239000002904 solvent Substances 0.000 claims abstract description 11
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000010992 reflux Methods 0.000 claims abstract description 5
- 239000011294 coal tar pitch Substances 0.000 claims description 97
- 239000003795 chemical substances by application Substances 0.000 claims description 25
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 24
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 claims description 18
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 claims description 10
- 229940043232 butyl acetate Drugs 0.000 claims description 10
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 claims description 10
- 239000011300 coal pitch Substances 0.000 claims description 9
- 238000005292 vacuum distillation Methods 0.000 claims description 7
- CHIHQLCVLOXUJW-UHFFFAOYSA-N benzoic anhydride Chemical group C=1C=CC=CC=1C(=O)OC(=O)C1=CC=CC=C1 CHIHQLCVLOXUJW-UHFFFAOYSA-N 0.000 claims description 6
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical group O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 3
- FMMWHPNWAFZXNH-UHFFFAOYSA-N Benz[a]pyrene Chemical compound C1=C2C3=CC=CC=C3C=C(C=C3)C2=C2C3=CC=CC2=C1 FMMWHPNWAFZXNH-UHFFFAOYSA-N 0.000 abstract description 16
- 238000000034 method Methods 0.000 abstract description 16
- 238000006243 chemical reaction Methods 0.000 abstract description 11
- 125000005575 polycyclic aromatic hydrocarbon group Chemical group 0.000 abstract description 8
- 239000003607 modifier Substances 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 2
- MWPLVEDNUUSJAV-UHFFFAOYSA-N anthracene Chemical compound C1=CC=CC2=CC3=CC=CC=C3C=C21 MWPLVEDNUUSJAV-UHFFFAOYSA-N 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- BBEAQIROQSPTKN-UHFFFAOYSA-N pyrene Chemical compound C1=CC=C2C=CC3=CC=CC4=CC=C1C2=C43 BBEAQIROQSPTKN-UHFFFAOYSA-N 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000011280 coal tar Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 2
- CWRYPZZKDGJXCA-UHFFFAOYSA-N acenaphthene Chemical compound C1=CC(CC2)=C3C2=CC=CC3=C1 CWRYPZZKDGJXCA-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000000711 cancerogenic effect Effects 0.000 description 2
- 231100000315 carcinogenic Toxicity 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- GVEPBJHOBDJJJI-UHFFFAOYSA-N fluoranthrene Natural products C1=CC(C2=CC=CC=C22)=C3C2=CC=CC3=C1 GVEPBJHOBDJJJI-UHFFFAOYSA-N 0.000 description 2
- 150000002469 indenes Chemical class 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 239000011301 petroleum pitch Substances 0.000 description 2
- 229920005547 polycyclic aromatic hydrocarbon Polymers 0.000 description 2
- -1 protective system Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 239000006200 vaporizer Substances 0.000 description 2
- KPAPHODVWOVUJL-UHFFFAOYSA-N 1-benzofuran;1h-indene Chemical compound C1=CC=C2CC=CC2=C1.C1=CC=C2OC=CC2=C1 KPAPHODVWOVUJL-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000029936 alkylation Effects 0.000 description 1
- 238000005804 alkylation reaction Methods 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 231100000357 carcinogen Toxicity 0.000 description 1
- 239000003183 carcinogenic agent Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 238000002715 modification method Methods 0.000 description 1
- 239000011331 needle coke Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
Landscapes
- Working-Up Tar And Pitch (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention relates to environment-friendly type modified coal asphalt and a preparation method thereof. The preparation method in the technical scheme comprises the following steps: placing 20-30 weight parts of coal asphalt into a reaction kettle with a reflux unit; then, under the conditions that temperature is 70 DEG C-90 DEG C and stirring speed is 80 r/minute-100r/minute, adding 67-77 weight parts of mixed solvent into the reaction kettle, stirring for 10 minutes, re-adding 2.6-3.2 weight parts of modifier and 0.20-0.32 weight parts of sulfuric acid under the condition that temperature and stirring speed are the same, and stirring for 1 hour-5 hours to obtain a coal asphalt mixture; and finally, under the condition with the temperature of 100 DEG C-110 DEG C, distilling the obtained coal asphalt mixture under reduced pressure to recycle solvent to prepare the environment-friendly type modified coal asphalt. According to the invention, process is simple, reaction temperature is low, dosage of the modifier is less, the solvent can be recycled, cost is low and content of polyaromatic hydrocarbon 3,4-benzopyrene in the coal asphalt can be effectively lowered.
Description
Technical field
The invention belongs to coal-tar pitch technical field.Be specifically related to a kind of environment-friendly modified coal-tar pitch and preparation method thereof.
Background technology
Coal-tar pitch is isolated bulk product in coal tar processing process, accounts for 50 ~ 60wt% of coal tar total amount, and its processing and utilization level and efficiency is most important to whole coal tar processing.At present, coal-tar pitch is mainly used in binding agent and the soaker of carbon pole, also for carbon black, protective system, needle coke and carbon fiber etc., and because the demand in downstream is limited, the serious production capacity surplus of coal-tar pitch.
Since the seventies in last century, many countries such as Germany, Switzerland, France, Poland successively produce and use coal-petroleum base mix asphalt to be used for paving the way.For a long time use and show, the anti-deformation that paves with coal-petroleum base mix asphalt is strong, resistance to abrasion good, the increase of the safety performance of driving, and especially under the adverse weather conditions such as rainy day, property retention is good.In addition, coal-tar pitch cost is low, and price is only petroleum pitch 40 ~ 50%, can not only effectively alleviate China's bitumen for road use situation that supply falls short of demand as replaced petroleum pitch to pave the way with coal-tar pitch, also can significantly reduce the construction cost of highway engineering.Therefore, with coal-tar pitch as bitumen for road use, can not only improve the added value of coal-tar pitch and solve the problem of coal-tar pitch surplus, and for improving China's Expressway Asphalt quality, solve China's oil asphalt quality is not high and product is short problem all tool be of great significance.
Owing to containing polycyclic aromatic hydrocarbons carcinogens 3 in coal-tar pitch, 4-benzopyrene etc., have in fact restricted coal-tar pitch and have been used for paving the way.To this, people have carried out a large amount of research, have obtained certain achievement: Germany adopts vacuum distillation method (US 5262043), and the method is 330-1000m by an evaporation area
2/ m
3vaporizer, pressure be 1MPa and temperature while being 300 ~ 380 ℃ by coal-tar pitch underpressure distillation, coal-tar pitch is 2 ~ 10min in the vaporizer residence time, the coal-tar pitch contained 3 obtaining, though 4-benzopyrene is less than 50 ppm, the manufacturing cost of this technique equipment used is high, and power consumption is large; Poland's employing polymeric modification method (Janusz Zieli ń ski (Benzo[a] pyrene in coal tar pitch:chemical conversion in situ by alkylation, fuel, 75,1543-1548,1996), with polyoxyethylene glycol (molecular weight >1500) as polymeric modifier, at 160 ℃, react 0.5 ~ 5h, 3, though the reduced rate of 4-benzopyrene reaches 90%, but the amount of polymers that this method needs is up to 30%, and cost is high; (civilian polymeric reagent of autumn reduces in coal-tar pitch 3 to Chinese scholar, the research of 4-benzopyrene, Coal Chemical Industry, 2007(1), 58-60) add 4% coumarone-indene resin in coal-tar pitch, 3,4-benzopyrene decreasing ratio reaches 46.78%, but the method is limited to removing of 3,4-benzopyrene, do not reach the build the road requirement of permit standard of coal-tar pitch.
From with, also there is no at present efficiently and meet the technology of suitability for industrialized production.
Summary of the invention
The present invention is intended to overcome prior art defect, object is to provide that a kind of cost is low, temperature of reaction is low, properties-correcting agent consumption is few, solvent is recyclable and the preparation method of the simple environment-friendly modified coal-tar pitch of technique, in the modified coal pitch of preparing by the method 3, the content of 4-benzopyrene can effectively be reduced.
For achieving the above object, the concrete steps of the technical solution used in the present invention are:
Step 1, the coal-tar pitch of 20 ~ 30 parts of quality is inserted in the reactor with reflux, then be under 80 ~ 100r/min condition at 70 ~ 90 ℃ with stirring velocity, to the mixed solvent that adds 67 ~ 77 parts of quality in described reactor, stir 10min, under uniform temp and stirring velocity condition, add successively again the properties-correcting agent of 2.6 ~ 3.2 parts of quality and the sulfuric acid of 0.20 ~ 0.32 part of quality, stir 1 ~ 5h, obtain coal-tar pitch mixture.
Step 2, by step 1 gained coal-tar pitch mixture under 100 ~ 110 ℃ of conditions, vacuum distillation recovered solvent, makes environment-friendly modified coal-tar pitch.
The particle diameter of described coal-tar pitch is 50 ~ 60 orders, and coal-tar pitch is medium temperature coal pitch or low temperature coal-tar pitch; Wherein: the softening temperature of medium temperature coal pitch is 75 ~ 95 ℃, the softening temperature of low temperature coal-tar pitch is 45 ~ 75 ℃.
Described mixed solvent is the mixed solvent of hexanaphthene and toluene or the mixed solvent for hexanaphthene and butylacetate; Wherein: the mass ratio of hexanaphthene and toluene is 1:(0.45 ~ 0.65), the mass ratio of hexanaphthene and butylacetate is 1:(0.45 ~ 0.65).
Described properties-correcting agent is benzoyl oxide or is MALEIC ANHYDRIDE.
Owing to adopting technique scheme, the present invention compared with prior art tool has the following advantages:
1, the present invention adopts popular response device, and stirring velocity is 80 ~ 100r/min, under 70 ~ 90 ℃ of conditions, reacts, and properties-correcting agent consumption is 10 ~ 13% of coal-tar pitch consumption, adopts vacuum distillation recovered solvent.Therefore technique is simple, properties-correcting agent consumption is few, and temperature of reaction is low, and cost is low.
2, coal-tar pitch is a kind of very complicated compound, polycyclic aromatic hydrocarbons is wherein as indenes, acenaphthene, pyrene, anthracene etc. and 3, 4-benzopyrene has similar chemical structure, when under usual conditions, coal-tar pitch reacts with polymer modifiers, these polycyclic aromatic hydrocarbonss all can react with properties-correcting agent, and it is actual in 3, the amount of 4-benzopyrene reaction is few, thereby cause 3, 4-benzopyrene reduced rate is little, if increase 3, the reduced rate of 4-benzopyrene, not only to strengthen properties-correcting agent consumption, and coal-tar pitch molecular structure after modification changes, molecular weight also can increase, thereby cause coal tar pitch soften point to raise, performance changes, restrict the actual use of coal-tar pitch.
The mixed solvent energy selectivity that the present invention adopts is by the carcinogenic polycyclic aromatic hydrocarbons 3 in coal-tar pitch, 4-benzopyrene dissolves, and react with coal-tar pitch under properties-correcting agent and catalyst action, generate harmless polynuclear compound, do not changing under the condition of coal-tar pitch character, reaching in elective reduction coal-tar pitch 3, the object of 4-benzopyrene, in coal-tar pitch 3, the reduced rate of 4-benzopyrene is more than 90%.
Therefore, the present invention has that technique is simple, temperature of reaction is low, properties-correcting agent consumption is few, solvent is recyclable, cost is low and can effectively reduce polycyclic aromatic hydrocarbons 3 in coal-tar pitch, the feature of 4-benzopyrene content.
Embodiment
Below in conjunction with embodiment, the invention will be further described, not the restriction to protection domain:
For avoiding repetition, this embodiment, by the main technical details of the raw material to involved or the unified description of preparation method, repeats no more in each embodiment:
The particle diameter of medium temperature coal pitch and low temperature coal-tar pitch is 50 ~ 60 orders; Wherein: the softening temperature of medium temperature coal pitch is 75 ~ 95 ℃, the softening temperature of low temperature coal-tar pitch is 45 ~ 75 ℃.
In the mixed solvent of hexanaphthene and toluene: the mass ratio of hexanaphthene and toluene is 1:(0.45 ~ 0.65);
In the mixed solvent of hexanaphthene and butylacetate: the mass ratio of hexanaphthene and butylacetate is 1:(0.45 ~ 0.65).
embodiment 1
A kind of environment-friendly modified coal-tar pitch and preparation method thereof, the concrete steps of the method are:
The coal-tar pitch of 20 ~ 25 parts of quality is inserted in the reactor with reflux, then be under 80 ~ 100r/min condition at 70 ~ 90 ℃ with stirring velocity, to the mixed solvent that adds 72 ~ 77 parts of quality in described reactor, stir 10min, under uniform temp and stirring velocity condition, add successively again the properties-correcting agent of 2.6 ~ 3.2 parts of quality and the sulfuric acid of 0.20 ~ 0.32 part of quality, stir 1 ~ 5h, obtain coal-tar pitch mixture.
Step 2, by step 1 gained coal-tar pitch mixture under 100 ~ 110 ℃ of conditions, vacuum distillation recovered solvent, makes environment-friendly modified coal-tar pitch.
In the present embodiment: coal-tar pitch is medium temperature coal pitch; Mixed solvent is the mixed solvent of hexanaphthene and toluene; Properties-correcting agent is MALEIC ANHYDRIDE.
embodiment 2
A kind of environment-friendly modified coal-tar pitch and preparation method thereof, except following technical parameter, all the other are with embodiment 1:
In the present embodiment: coal-tar pitch is low temperature coal-tar pitch; Properties-correcting agent is benzoyl oxide.
embodiment 3
A kind of environment-friendly modified coal-tar pitch and preparation method thereof, except following technical parameter, all the other are with embodiment 1:
In the present embodiment: mixed solvent is the mixed solvent of hexanaphthene and butylacetate; Properties-correcting agent is benzoyl oxide.
embodiment 4
A kind of environment-friendly modified coal-tar pitch and preparation method thereof, except following technical parameter, all the other are with embodiment 1:
In the present embodiment: coal-tar pitch is low temperature coal-tar pitch; Mixed solvent is the mixed solvent of hexanaphthene and butylacetate.
embodiment 5
A kind of environment-friendly modified coal-tar pitch and preparation method thereof, the concrete steps of the method are:
The coal-tar pitch of 25 ~ 30 parts of quality is inserted in the reactor with reflux, then be under 80 ~ 100r/min condition at 70 ~ 90 ℃ with stirring velocity, to the mixed solvent that adds 67 ~ 72 parts of quality in described reactor, stir 10min, under uniform temp and stirring velocity condition, add successively again the properties-correcting agent of 2.6 ~ 3.2 parts of quality and the sulfuric acid of 0.20 ~ 0.32 part of quality, stir 1 ~ 5h, obtain coal-tar pitch mixture.
Step 2, by step 1 gained coal-tar pitch mixture under 100 ~ 110 ℃ of conditions, vacuum distillation recovered solvent, makes environment-friendly modified coal-tar pitch.
In the present embodiment: coal-tar pitch is medium temperature coal pitch; Mixed solvent is the mixed solvent of hexanaphthene and toluene; Properties-correcting agent is MALEIC ANHYDRIDE.
embodiment 6
A kind of environment-friendly modified coal-tar pitch and preparation method thereof, except following technical parameter, all the other are with embodiment 5:
In the present embodiment: coal-tar pitch is low temperature coal-tar pitch; Properties-correcting agent is benzoyl oxide.
embodiment 7
A kind of environment-friendly modified coal-tar pitch and preparation method thereof, except following technical parameter, all the other are with embodiment 5:
In the present embodiment: mixed solvent is the mixed solvent of hexanaphthene and butylacetate; Properties-correcting agent is benzoyl oxide.
embodiment 8
A kind of environment-friendly modified coal-tar pitch and preparation method thereof, except following technical parameter, all the other are with embodiment 5:
In the present embodiment: coal-tar pitch is low temperature coal-tar pitch; Mixed solvent is the mixed solvent of hexanaphthene and butylacetate.
This embodiment compared with prior art tool has the following advantages:
1, this embodiment adopts popular response device, and stirring velocity is 80 ~ 100r/min, under 70 ~ 90 ℃ of conditions, reacts, and properties-correcting agent consumption is 10 ~ 13% of coal-tar pitch consumption, adopts vacuum distillation recovered solvent.Therefore technique is simple, properties-correcting agent consumption is few, and temperature of reaction is low, and cost is low.
2, coal-tar pitch is a kind of very complicated compound, polycyclic aromatic hydrocarbons is wherein as indenes, acenaphthene, pyrene, anthracene etc. and 3, 4-benzopyrene has similar chemical structure, when under usual conditions, coal-tar pitch reacts with polymer modifiers, these polycyclic aromatic hydrocarbonss all can react with properties-correcting agent, and it is actual in 3, the amount of 4-benzopyrene reaction is few, thereby cause 3, 4-benzopyrene reduced rate is little, if increase 3, the reduced rate of 4-benzopyrene, not only to strengthen properties-correcting agent consumption, and coal-tar pitch molecular structure after modification changes, molecular weight also can increase, thereby cause coal tar pitch soften point to raise, performance changes, restrict the actual use of coal-tar pitch.
The mixed solvent energy selectivity that this embodiment adopts is by the carcinogenic polycyclic aromatic hydrocarbons 3 in coal-tar pitch, 4-benzopyrene dissolves, and react with coal-tar pitch under properties-correcting agent and catalyst action, generate harmless polynuclear compound, do not changing under the condition of coal-tar pitch character, reaching in elective reduction coal-tar pitch 3, the object of 4-benzopyrene, in coal-tar pitch 3, the reduced rate of 4-benzopyrene is more than 90%.
Therefore, this embodiment has that technique is simple, temperature of reaction is low, properties-correcting agent consumption is few, solvent is recyclable, cost is low and can effectively reduce polycyclic aromatic hydrocarbons 3 in coal-tar pitch, the feature of 4-benzopyrene content.
Claims (5)
1. a preparation method for environment-friendly modified coal-tar pitch, is characterized in that described preparation method is:
Step 1, the coal-tar pitch of 20 ~ 30 parts of quality is inserted in the reactor with reflux, then be under 80 ~ 100r/min condition at 70 ~ 90 ℃ with stirring velocity, to the mixed solvent that adds 67 ~ 77 parts of quality in described reactor, stir 10min, under uniform temp and stirring velocity condition, add successively again the properties-correcting agent of 2.6 ~ 3.2 parts of quality and the sulfuric acid of 0.20 ~ 0.32 part of quality, stir 1 ~ 5h, obtain coal-tar pitch mixture;
Step 2, by step 1 gained coal-tar pitch mixture under 100 ~ 110 ℃ of conditions, vacuum distillation recovered solvent, makes environment-friendly modified coal-tar pitch.
2. the preparation method of environment-friendly modified coal-tar pitch according to claim 1, the particle diameter that it is characterized in that described coal-tar pitch is 50 ~ 60 orders, coal-tar pitch is medium temperature coal pitch or low temperature coal-tar pitch; Wherein: the softening temperature of medium temperature coal pitch is 75 ~ 95 ℃, the softening temperature of low temperature coal-tar pitch is 45 ~ 75 ℃.
3. the preparation method of environment-friendly modified coal-tar pitch according to claim 1, is characterized in that described mixed solvent is the mixed solvent of hexanaphthene and toluene or the mixed solvent for hexanaphthene and butylacetate; Wherein: the mass ratio of hexanaphthene and toluene is 1:(0.45 ~ 0.65), the mass ratio of hexanaphthene and butylacetate is 1:(0.45 ~ 0.65).
4. the preparation method of environment-friendly modified coal-tar pitch according to claim 1, is characterized in that described properties-correcting agent is benzoyl oxide or is MALEIC ANHYDRIDE.
5. an environment-friendly modified coal-tar pitch, is characterized in that described environment-friendly modified coal-tar pitch is according to the prepared environment-friendly modified coal-tar pitch of preparation method of the environment-friendly modified coal-tar pitch described in any one in claim 1 ~ 4.
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| CN201410110270.8A CN103834421B (en) | 2014-03-24 | 2014-03-24 | Environment-friendly type modified coal asphalt and preparation method thereof |
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| CN201410110270.8A CN103834421B (en) | 2014-03-24 | 2014-03-24 | Environment-friendly type modified coal asphalt and preparation method thereof |
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| CN103834421A true CN103834421A (en) | 2014-06-04 |
| CN103834421B CN103834421B (en) | 2015-04-29 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104403681A (en) * | 2014-11-26 | 2015-03-11 | 辽宁石油化工大学 | Method for extracting benzopyrene from coal pitch |
| CN105238429A (en) * | 2015-10-19 | 2016-01-13 | 太原理工大学 | Method for preparing low-toxicity modified coal pitch for road building |
| CN107474865A (en) * | 2017-08-29 | 2017-12-15 | 北京化工大学 | A kind of modification process of pitch |
| CN112126238A (en) * | 2020-09-25 | 2020-12-25 | 北京紫瑞天成科技有限公司 | Asphalt mixture modifier prepared from coal tar and preparation method thereof |
| CN114514062A (en) * | 2019-09-26 | 2022-05-17 | 赛峰航空陶瓷技术公司 | Method for treating PAH-loaded oils |
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| CN103834421B (en) | 2015-04-29 |
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