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SOFTENING OF ASPHALTS IN DILUTE SOLUTIONS AT PRIMARY DISTILLATION CONDITIONS.
| 题名： | SOFTENING OF ASPHALTS IN DILUTE SOLUTIONS AT PRIMARY DISTILLATION CONDITIONS. |
| 作者： | Burr-BL; Davison-RR; Glover-CJ; Bullin-JA |
| 关键词： | ASPHALTS-; SOFTENING-; FOURIER-TRANSFORMS; INFRARED-SPECTROSCOPY; GEL-PERMEATION-CHROMATOGRAPHY; REACTION-RATES; ASPHALT-SOURCES; SOLVENTS-; TEMPERATURE- |
| 摘要： | Softening of asphalts in dilute solutions, often by as much as 50%, occurred in several instances during experiments using a modified Roto-vap recovery technique. The softening is caused by a mechanism that is characterized by Fourier transform infrared spectroscopy spectral growth near the traditional carbonyl region associated with oxidative hardening, as well as other minor changes. Gel permeation chromatograms of solvent-softened asphalts show formation of one and sometimes two new narrow peaks, suggesting that the reactions produce a very narrow range of products. Reaction rates vary considerably with asphalt source, solvent, and solution conditions. The rates also increase considerably with Roto-vap oil bath temperature from 102 deg C to 149 deg C. Reaction rates decrease with concentration, being almost nonexistent at 0.12 g/mL but generally significant at 0.06 g/mL. Reactions proceed faster in more polar extraction solvents, such as trichloroethylene with 15% ethanol (TCE/EtOH), than in toluene with 15% ethanol. Inhibitors such as butylated hydroxy toluene slow the reactions but do not appear to affect the extent of reaction. Compatible asphalts (such as SHRP AAG-1) react fastest at lower temperatures, whereas incompatible but reactive asphalts (SHRP AAK-1) react fastest at higher temperations. The reactions appear to be dependent on the solvent's ability to dissolve associated species. However, the reactions have also been detected in dissolved dilute solutions (below 0.15 g/mL) to temperatures above 93 deg C, especially in polar solvents such a TCE/EtOH, for extended periods of time. |
| 总页数： | Transportation Research Record. 1994. (1436) pp47-53 (13 Fig., 1 Tab., 7 Ref.) |
| 报告类型： | 科技报告 |
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