Environment-friendly type modified coal asphalt and preparation method thereof

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 [0001] The invention is the field of coal asphalt technology.Specifically involved an environmentally friendly modified coal asphalt and its preparation methods. Background technique [0002] Coal asphalt is a large product separated from the process of coal coking oil processing, accounting for 50 ~ 60WT%of the total coal tar. Its processing and utilization level and benefits are essential for the entire coal tar.At present, coal pettea is mainly used for carbonic electrode binders and impregnants, and it is also used for charcoal black, anticorrosive coatings, needle -shaped coke, and carbon fiber. Due to the limited demand for downstream, the coal asphalt is seriously overcapacity. [0003] Since the 1970s, many countries such as Germany, Switzerland, France, Poland have successively produced and used coal-petroleum-based mixed asphalt for paving the way.Long-term use shows that the anti-deformation performance of coal-oil-based mixed asphalt paved on the aspha...

AI Technical Summary

Problems solved by technology

In this regard, people have carried out a lot of research and achieved certain results: Germany adopts the vacuum distillation method (US 5262043), which uses an evaporation area of ​​330-1000m2 / m3 evaporator, when the pressure is 1MPa and the temperature is 300~380℃, the coal tar pitch is vacuum distilled. The residence time of the coal tar pitch in the evaporator is 2~10min, and the obtained coal tar pitch contains 3,4-benzene Although pyrene is less than 50 ppm, the manufacturing cost of the equipment used in this process is high, and the energy consumption is large; Poland adopts the polymerization modification method (Janusz Zieliński (Benzo[a]pyrene in coal tar pitch: chemical conversion in situ by alkylation, fuel, 75, 1543-1548, 1996), using polyethylene glycol (molecular weight>1500) as a polymerization modifier, reacting at 160°C for 0.5~5h, although the reduction rate of 3,4-benzopyrene reached 90%, but The amount of polymer required by this method is as high as 30%, and the cost is high; Chinese scholars (Zhang Qiumin's research on reducing 3,4-benzopyrene in coal tar pitch with polymer reagents, Coal Chemical Industry, 2007 (1), 58-60) added 4 % of coumarone-indene resin into coal tar pitch, the removal rate of 3,4-benzopyrene reached 46.78%, but this method is limited to the removal of 3,4-benzopyrene, which cannot reach coal tar pitch road construction Access Standard Requirements

[0005] From the above, there is no efficient and industrialized production technology