| Title |
Bitumen extraction and recovery in road industry: A global methodology in solvent substitution from a comprehensive review |
| ID_Doc |
16733 |
| Authors |
Ziyani, L; Boulangé, L; Nicolaï, A; Mouillet, V |
| Title |
Bitumen extraction and recovery in road industry: A global methodology in solvent substitution from a comprehensive review |
| Year |
2017 |
| Published |
|
| DOI |
10.1016/j.jclepro.2017.05.022 |
| Abstract |
In the roadworks sector, extraction is a crucial step that consists of separating the bituminous binder from the mineral matter in asphalt mixture or reclaimed asphalt using a chlorinated solvent before the characterisation of binders' properties and content. This review, conducted on scientific articles, technical papers and standards from 1996 to 2016, combined all existing bitumen extraction/recovery methods to toxicological data and health concerns as well as inputs on circular economy and sustain ability of solvents. Nearly 50% of the documents dated from 2001 and found in this study deal with these latest aspects. There are ten different methods for extracting and two methods for recovering bituminous binders using eight of the most common solvents. One crucial point highlighted by the literature is that the nature of solvent has a significant impact on the final properties of the recovered binder. The quality of extraction and binder recovery operations largely depends on the solubility of the binder in relation to the solvent. According to the calculated Hansen solubility parameters, the lowest relative energy difference parameters (solubility study) are obtained using perchloroethylene, 1,1,1-trichloroethane and xylene solvents. This means that these solvents are the most compatible with bitumen. There is a relationship between the relative energy difference and the octanol/water partition coefficient currently used in the environmental risk assessment. All the Strengths, Weaknesses, Opportunities, Threats of different extraction and recovery methods currently in use highlights the fact that at this time, there are no alternative products that are as effective under the current technical conditions of use as chlorinated solvents. This represents a challenge for new research in the trade industry and in health institution to find a substitute for chlorinated products that meets all the sustainability and circular economy criteria. (C) 2017 Elsevier Ltd. All rights reserved. |
| Author Keywords |
Bitumen; Extraction; Solubility; Chemical risk; Sustainability; Circular economy |
| Index Keywords |
Index Keywords |
| Document Type |
Other |
| Open Access |
Open Access |
| Source |
Science Citation Index Expanded (SCI-EXPANDED) |
| EID |
WOS:000407655400005 |
| WoS Category |
Green & Sustainable Science & Technology; Engineering, Environmental; Environmental Sciences |
| Research Area |
Science & Technology - Other Topics; Engineering; Environmental Sciences & Ecology |
| PDF |
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