Biological asphalt and preparation method thereof

Abstract

The invention relates to biological asphalt and a preparation method thereof. The preparation method comprises steps as follows: 1) inorganic salt is blended in biological oil and mixed uniformly; crude glycerin is added, and the mixture is mixed uniformly; 2) a product obtained in the step 1) is distilled under the normal pressure, and light components and mixed components comprising glycerin andlignin pyrolysis products are separated; 3) water is added to the mixed components, the mixture is mixed uniformly, left to stand and filtered, a water-glycerin mixed phase is removed, and a crude lignin pyrolysis product is obtained; 4) the crude lignin pyrolysis product is heated to the constant weight state, and the biological asphalt is obtained; the water-glycerin mixed phase is distilled under the normal pressure, and separated glycerin is recycled. The lignin pyrolysis product can be effectively separated through pretreatment of biomass pyrolysis oil, and meanwhile, the separation process of conventional distillation is improved, so that the asphalt components in the biomass pyrolysis oil can be sufficiently separated and have excellent usability and ageing resistance.

Description

technical field [0001] The invention relates to a bio-asphalt and a preparation method thereof, and belongs to the technical field of preparation of renewable bio-based road asphalt materials. Background technique [0002] At present, the refining and utilization of bio-oil at home and abroad is mainly focused on converting the light components obtained by pyrolysis of cellulose and hemicellulose in biomass into emulsified fuels, fuel oil additives and high value-added chemicals through chemical processes. The heavy components of bio-oil obtained from lignin pyrolysis, which account for a large proportion of bio-oil, have not been effectively utilized because of their difficulty in conversion. [0003] In order to make full use of bio-oil, a potential alternative resource of fossil energy, and alleviate the increasingly tense supply of petroleum asphalt, relevant scholars at home and abroad have begun to use biomass resources to prepare road asphalt materials and have made c...

AI Technical Summary

Problems solved by technology

[0004] Combining CN102796547A "Bio-asphalt, Bio-asphalt composition and its preparation method" and CN103396818A "A kind of bio-asphalt and its preparation method" and other schemes can be concluded that the main problems of bio-asphalt materials at this stage are: 1) due to the heat generated by biomass The pyrolysis oil contains a large amount of water-soluble substances, so the lignin pyrolysis products suitable for asphalt materials will form emulsions with water-soluble components that have a greater negative impact on the performance of asphalt, making it difficult to separate; 2) bio-asphalt materials Because there are more oxygen-containing functional groups such as carboxyl and aldehyde groups, there are characteristics of poor low-temperature performance and anti-aging performance; 3) The current separation and preparation methods of bio-asphalt have harsh process conditions, high economic costs, and easy to make the structure during separation. Change or introduce characteristics of other impurities

Images