Mitigating crosslinking reactions through preconversion strategies. Quarterly report Number 6, April--June 1993
The ultimate goal of this research is to help develop preconversion techniques that will mitigate crosslinking reactions and thereby substantially increase liquid yields during subsequent liquefaction. The immediate objective is to determine the potential for augmenting pretreatment of low-rank coals through the use of electron-transfer agents. This potential will be explored in laboratory studies through determination of the impact on the evolution of oxygen functions, crosslinking, and conversion. The pretreatments explored include several that hold promise for effecting deoxygenation (or other reduction), for example, treatment with CO/water/base and hydroquinones or other electron-transfer agents in various combinations. The effects of these pretreatments on functional group distribution, macromolecular structure, and liquefaction are to be compared with those that have shown promise in the past for improved conversions, such as simple hydrothermal pretreatment, mild hydrogenation with dispersed catalysts, and demineralization. Additional objectives are to improve test procedures for assessing the effect of the pretreatment on subsequent liquefaction and achieve also some understanding of the chemical origins of the effects observed. These tests are: (1) proton magnetic resonance thermal analysis (PMRTA) for determining the effect of pretreatment on fluidity as liquefaction conditions (temperature, pressure) are approached; and (2) a TGA-based simulated distillation for convenient measurement of product volatility following small scale batch liquefaction. Results are presented on the following: Pretreatment and liquefaction of Wyodak and Zap lignite coals; Evolution of oxygen functional groups; PMRTA analyses of pretreated coals; and Development of a TGA-based simulated distillation technique.
- Research Organization:
- SRI International, Menlo Park, CA (United States). Molecular Physics Lab.
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC22-91PC91044
- OSTI ID:
- 10150886
- Report Number(s):
- DOE/PC/91044-T2; ON: DE94011790; BR: AA2515150; TRN: AHC29411%%27
- Resource Relation:
- Other Information: PBD: Mar 1994
- Country of Publication:
- United States
- Language:
- English
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