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Acidic compounds in pyrolysis oil from an industrial unit were extracted and enriched, and then were analyzed by Fourier transform infrared spectroscopy, hydrogen nuclear magnetic resonance, elemental analysis, and gas chromatography/mass spectrometry, respectively. The results showed that the acid compounds were enriched in ethyl acetate isolates and acetone isolates. Content of O element in acid-rich components significantly increased. The acid-rich components consisted of much methylene and –C=C– structures. Further, 51.24% of the methyl ester products were identified, including carboxylic acid methyl ester (36.22%), chain hydrocarbons (13.41%), cycloalkanes (<1%), and alcohols (<1%). [ABSTRACT FROM PUBLISHER]

Lump theory was used to carry out a prior simulation for a residual oil hydrodesulfurization reaction kinetic model. The prior simulation results show that the use of the lumping kinetic method to investigate residual oil HDS process is feasible, and the proper lump number is 3 or 4. Subsequently, combined with the sulfur compounds hydrodesulfurization reaction mechanism and the level of sulfur compounds detection, a residual oil hydrodesulfurization reaction lumping kinetic model is established on the basis of sulfur content in four components of residual oil, which can provide a reference for further research. [ABSTRACT FROM PUBLISHER]

In this article, heavy fraction (>350°C) of tire pyrolysis oil was used to modify road bitumen. Experiments were carried out to investigate the effect of the modification conditions, such as blending temperature, shear rate, blending time, and admixing amount of heavy fraction on the properties of modified asphalt. The results revealed that the heavy fraction could be used as the modifier for road bitumen, and the proper modification conditions were the temperature range of 140-160°C for 10 min, shear rate of 2,000 rpm and the proportion of heavy fraction 1 wt%, and that the modified asphalt showed excellent ductility before and after the aging test. [ABSTRACT FROM AUTHOR]

Selective hydrogenation of C5 hydrocarbons from steam cracker was studied. Experiments were carried out in a fixed-bed reactor at 40°C-80°C and 0.3-2.5 MPa over a commercial nickel-alumina catalyst. The results show that the conversion of diolefins and selectivity of mono-olefins increase as temperature increases, but when the temperature is above 60°C, the selectivity of mono-olefins decreases. With the increasing reaction pressure and the molar ratio of hydrogen and olefins, the loss of the mono-olefins increases, whereas the selectivity of mono-olefins increases as the liquid hourly space velocity (LHSV) increases. The optimal conditions are: pressure 0.5-1.0, temperature 50°C-60°C, LHSV 1.0-2.0 h-1, molar ratio of hydrogen and olefins 1.0-1.2. The stability testing illustrated the catalyst's high stability and activity; it is a fine commercial catalyst for selective hydrogenation. [ABSTRACT FROM AUTHOR]