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Removal of Sulfur Compounds in Residue by Peracetic Acid Oxidation⁃Extraction
Sun Lijuan, Cao Zubin, Han Dongyun, Wang Rong, Gao Yi
Using Marie vacuum residue as raw material, the acetic acid⁃peroxyacetic acid oxidation system was used to pre⁃oxidize the vacuum residue, and N, N⁃dimethylformamide (DMF) was used to extract and remove sulfide in the residue. Under the conditions of m(residue)/m(solvent)=1
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1, Investigate the effects of oxidant dosage, reaction time and temperature on the removal of sulfur content in residue oil. X⁃ray photoelectron spectroscopy (XPS) and Fourier infrared spectrometer (FT⁃IR) The organic sulfur type distribution and functional groups of the residual oil before and after oxidation were detected. The results show that under the conditions of m(residue oil)/m(solvent)/m(acetic acid⁃peroxyacetic acid)=5
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5
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4, oxidation temperature 70 ℃, and oxidation time 50 minutes, the C-S stretching vibration absorption peak of the oxidized residue is obviously weakened. Thiophene type sulfur can be removed by extraction after being oxidized to sulfones. The sulfur content of the residue is reduced from 4.01% to 2.67%, the desulfurization rate reaches 33.37%, and the residue yield is 94.82%.
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