Disposal of hazardous automobile shredder residue (ASR) via pyrolysis generates recovered valuable products, whereas hazardous pollutants and low-value products problems are inevitable due to its high content of chlorine. In the present study, accurate method for precisely determining chlorine content of solid samples was established by conducting re-combustion of flue gas. Subsequently, chlorine behavior and conversion mechanism during ASR pyrolysis were systematically studied between 480 oC and 600 oC. For organic chlorine (Org-Cl), the experimental results showed that the types of released chlorinated gases was complex and HCl only accounted for 35.81% of the gas phase, while short-chain hydrocarbons with carbon atom between two and four accounted for 52.65%. Chlorine was predominantly retained in char and Org-Cl was the main contributor to residue chlorine (accounted for over 50% in char). The content of inorganic chlorine (InO-Cl) was low in raw sample but significantly increased in char. By detailedly analyzing the chlorine speciation within char, it was confirmed that Org-Cl could be converted to InO-Cl due to the complicated secondary reactions with metallic compounds. The conversion was favored with the increase of Org-Cl content and temperature. Our findings clarified the evolution mechanism of chlorine and speciation transformation from Org-Cl to InO-Cl, thus providing guidance for chlorine regulation and efficient recycling of metal resources.
A pillar[5]arene-based supramolecular polymer π-gel, BPN-G, can selectively identify and separate benzoic acid isomers through rationally introduced multi-intermolecular interactions.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
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