Lignin modified asphalt, preparation method therefor and applications thereof
A technology for modifying asphalt and lignin, which is applied in the field of environmental engineering research to achieve the effect of saving oil resources
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Embodiment 1
[0034] The preparation method of lignin modified asphalt comprises the steps:
[0035] (1) Extraction of lignin
[0036] Take the papermaking black liquor, add hydrochloric acid to adjust the pH to 3.5, raise the temperature of the acidified papermaking black liquor to 80°C within 15 minutes, and then centrifuge to remove the lower layer of precipitate, repeatedly wash with deionized water until neutral, and dry at 120°C for 24 hours , to obtain crude lignin;
[0037] (2) Refining lignin
[0038] Add the crude lignin product obtained in step (1) into water, the quality of the water is 15 times that of the crude lignin product, prepare an aqueous lignin solution, place the prepared aqueous lignin solution in a reactor, adjust the pH to 2.5 with hydrochloric acid, and After stirring at 70°C for 3.5h, the filter cake was taken out by suction filtration, washed repeatedly with deionized water until neutral, and dried in an oven at 120°C for 24h to obtain refined lignin;
[0039...
Embodiment 2
[0044] The preparation method of lignin modified asphalt comprises the steps:
[0045] (1) Extraction of lignin
[0046] Take the papermaking black liquor, add hydrochloric acid to adjust the pH to 2.5, heat the acidified papermaking black liquor to 80°C within 20 minutes, then centrifuge to remove the lower layer of precipitate, wash it repeatedly with deionized water until neutral, and dry it at 120°C for 24 hours , to obtain crude lignin;
[0047] (2) Refining lignin
[0048] Add the crude lignin product obtained in step (1) into water, the quality of the water is 25 times that of the crude lignin product, prepare an aqueous lignin solution, place the prepared aqueous lignin solution in a reactor, adjust the pH to 1.5 with hydrochloric acid, and After stirring at 90°C for 2.5h, the filter cake was taken out by suction filtration, washed repeatedly with deionized water until neutral, and dried in an oven at 120°C for 24h to obtain refined lignin;
[0049] (3) Modification o...
Embodiment 3
[0054] The preparation method of lignin modified asphalt comprises the steps:
[0055] (1) Extraction of lignin
[0056] Take the papermaking black liquor, add hydrochloric acid to adjust the pH to 3, raise the temperature of the acidified papermaking black liquor to 80°C within 18 minutes, and then centrifuge to remove the lower layer of precipitate, repeatedly wash with deionized water until neutral, and dry at 120°C for 24 hours , to obtain crude lignin;
[0057] (2) Refining lignin
[0058] Add the crude lignin product obtained in step (1) into water, the quality of the water is 20 times that of the crude lignin product, prepare an aqueous lignin solution, place the prepared aqueous lignin solution in a reactor, adjust the pH to 2 with hydrochloric acid, and After stirring at 80°C for 3 hours, the filter cake was taken out by suction filtration, washed repeatedly with deionized water until neutral, and dried in an oven at 120°C for 24 hours to obtain refined lignin;
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