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Environment-friendly asphalt and preparation method thereof

An asphalt and environmental protection technology, applied in the processing of tar asphalt/petroleum asphalt/natural asphalt, chemically processing tar asphalt/petroleum asphalt/natural asphalt, petroleum industry, etc. and other problems, to achieve the effect of increased β resin content, low cost and increased coking value

Active Publication Date: 2015-05-06
SINOSTEEL ANSHAN RES INST OF THERMO ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process includes adding alkali substances to the reaction kettle to adjust the pH value, which undoubtedly increases the salt and alkali substances in the prepared asphalt, which is difficult to remove, increases the ash content of the asphalt, and affects its performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0025] The preparation method of an environment-friendly asphalt according to the present invention comprises the following steps: weighing 100 parts by weight of raw materials, adding 1 to 20 parts by weight of modifier and 1 to 20 parts by weight of accelerator, mixing and stirring evenly, Under gas protection, raise the temperature to 120-350°C, and polymerize at constant temperature for 1-20 hours; stop nitrogen or argon, and distill at a pressure of 0-30kPa to obtain environmentally friendly asphalt.

[0026] The purpose of distillation under the pressure of 0-30kPa is to recover the accelerator.

[0027] The softening point of the prepared environment-friendly bitumen is 20-300 DEG C, and the content of benzo[a]pyrene is lower than 500ppm. Benzo[a]pyrene (BaP) content determination method can adopt high performance liquid chromatography (HPLC).

Embodiment 1

[0030] 100 parts by weight of soft asphalt with a softening point of 44°C and QI (quinoline insolubles) of 1.45% are placed in the reactor, heated to 100-120°C to melt, and 5 parts by weight of paraformaldehyde and 3 parts by weight of benzenesulfonic acid (boiling point 137°C, normal pressure), mixed and stirred evenly, heated up to 130°C under nitrogen protection, and polymerized at constant temperature for 5 hours; stopped nitrogen, heated up to 160°C, and distilled under reduced pressure under 1kPa pressure 15min, get the environment-friendly asphalt product.

[0031] The analysis and detection indicators of this environmentally friendly asphalt product are as follows: softening point 93°C, toluene insoluble content of 35.80%, quinoline insoluble content of 4.55%, β resin content of 31.25%, coking value of 58.08%, benzo[a]pyrene (BaP) content was 463.1 ppm.

Embodiment 2

[0033] Put 100 parts by weight of medium-temperature asphalt with a softening point of 85°C and a QI of 4.88% in the reactor, heat up to 100-120°C to melt it, and then slowly add 10 parts by weight of terephthalaldehyde and 5 parts by weight of formaldehyde Basesulfonic acid (boiling point 167°C, 13.33KPa), mix and stir evenly, heat up to 170°C under nitrogen protection, and polymerize at constant temperature for 4 hours; stop nitrogen, heat up to 200°C, and distill under reduced pressure at 1kPa for 15min to obtain environmental protection Bituminous products.

[0034] The analysis and detection indicators of this environmentally friendly asphalt product are as follows: softening point 122°C, toluene insoluble content 40.87%, quinoline insoluble content 6.62%, β resin content 34.25%, coking value 61.88%, BaP content 335.2ppm.

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Abstract

The invention relates to environment-friendly asphalt comprising the following components in parts by weight: 100 parts of raw material, 1-20 parts of a modifier and 1-20 parts of an accelerant, wherein the raw material is selected from one, two or more than two of aromatic heavy oil, coal tar pitch and modified coal tar pitch. A preparation method of the environment-friendly asphalt comprises the following steps: adding the modifier and the accelerant into the raw material, mixing and stirring uniformly, heating to 120-350 DEG C under the protection of nitrogen or argon, and performing constant-temperature polymerization for 1-20 hours; and stopping nitrogen or argon, distilling at a pressure of 0-30kPa to prepare the environment-friendly asphalt. Compared with the prior art, the invention has the beneficial effects that the content of carcinogenic polycyclic aromatic hydrocarbon in the raw material is reduced to the utmost extent, residues of the modifier and the accelerant are avoided, the accelerant is recyclable, and the content of benzo-[a]-pyrene (BaP) in the prepared environment-friendly asphalt is lower than 500ppm, so that the environment-friendly asphalt has a very important significance for human health and control of environmental pollution; and the preparation method is simple and feasible in technological process, mild in reaction condition, beneficial for energy conservation and consumption reduction, low in cost and quick in response.

Description

technical field [0001] The invention relates to the technical field of coal tar pitch deep processing, in particular to an environment-friendly pitch and a preparation method thereof. Background technique [0002] Coal tar pitch is the residue of coal tar distillation and extraction fractions (light oil, phenol oil, naphthalene oil, washing oil and anthracene oil, etc.), and is a thermoplastic material with unique strong bonding ability, rich carbon and low ash, and Solid carbonaceous materials have excellent compatibility and affinity, high coking residual carbon value, easy graphitization of carbonized products, good penetration and wettability, cheap and easy to obtain, and are widely used in aluminum smelting, steel smelting, carbon Industry, refractory materials, building materials and road construction and other industries. Coal tar pitch contains many carcinogenic polycyclic aromatic hydrocarbons, especially the strong carcinogen benzo[a]pyrene, which seriously endan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10C3/02
CPCC10C3/026
Inventor 孟庆波何莹屈滨刘书林武全宇陈雪杨桦张功多
Owner SINOSTEEL ANSHAN RES INST OF THERMO ENERGY CO LTD
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