Bio-agent for extraction of asphaltene from siliceous surfaces
View Patent ↗Treating aged asphalt includes contacting aged asphalt with a bioagent to yield a mixture. The aged asphalt includes a siliceous stone component and bitumen, and the bioagent includes bio-oils formed from hybrid biomasses. The siliceous stone component and the bitumen are separated. The bioagent promotes separation of the siliceous stone from the bitumen. A rejuvenated bitumen composition includes recycled bitumen, virgin bitumen, and a bioagent. The recycled bitumen can be produced from recycled asphalt paving, and the bioagent can include bio-oils formed from hybrid biomasses.
1 . A method of treating aged asphalt, the method comprising:
contacting aged asphalt with a bioagent to yield a mixture, wherein the aged asphalt comprises a siliceous stone component and bitumen, and the bioagent comprises bio-oils formed from swine manure and algae; and
separating the siliceous stone component from the bitumen to yield a recovered bitumen,
wherein the bioagent promotes separation of the siliceous stone component from the bitumen.
2 . The method of claim 1 , wherein the bioagent peptizes the recovered bitumen.
3 . The method of claim 1 , further comprising combining the recovered bitumen with additional bitumen to yield a mixed bitumen.
4 . The method of claim 3 , further comprising combining the mixed bitumen with aggregate to yield asphalt.
5 . The method of claim 3 , wherein the bioagent forms a hydrophobic bridge between the siliceous stone component and the bitumen, thereby enhancing water-damage resistance of the mixed bitumen.
6 . The method of claim 1 , wherein the bioagent comprises one or more of p-cresol, phenol, N-methyl-2-pyrrolidone, 1-methyl-9H-pyrido[3,4-b] indole, N-methyl-myristamide, nonadecanamide, 1-butyl-piperidine, and mesitonitrile.
7 . The method of claim 1 , wherein the bioagent comprises specific functional groups comprising polar oxygen and nitrogen heteroatoms.
8 . The method of claim 1 , wherein the bioagent is produced from a mixture comprising about 10 wt % to about 30 wt % of the swine manure and about 70 wt % to about 90 wt % of the algae.
9 . The method of claim 1 , wherein the mixture comprises about 5 wt % to about 15 wt % of the bioagent and about 85 wt % to about 95 wt % of the aged asphalt.
10 . The method of claim 1 , wherein separating the siliceous stone component from the bitumen comprises washing the bitumen from a surface of the siliceous stone component.
11 . The method of claim 1 , wherein the bioagent comprises one or more of phenol compounds, heterocyclic compounds, aliphatic compounds comprising oxygen and nitrogen, aromatic compounds comprising nitrogen, and fused aromatic compounds comprising nitrogen.
12 . The method of claim 1 , further comprising forming the bioagent by hydrothermal liquefaction of the swine manure and the algae.
13 . The method of claim 1 , wherein the bio-oils comprise waste cooking oil.