skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: An investigation of the role of water on retrograde/condensation reactions and enhanced liquefaction yields. Final report

Abstract

While great strides have been made in developing the technology of coal liquefaction processes in recent years, many unsolved problems still remain before a viable and economical process can be achieved. The technological problems that still exist can be solved through a more fundamental understanding of the chemistry associated with each stage of the coal liquefaction process, starting with any pretreatment steps that may be carried out on the coal itself. Western Research Institute, under the a contract from the US Department of Energy, has conducted a study of different methods of coal drying as pretreatment steps before liquefaction. The results of that study are the subject of this report. Coals that were dried or partially dried thermally and with microwaves had lower liquefaction conversions than coals containing equilibrium moisture contents. However, chemically dried coals had conversions equal to or greater than the premoisturized coals. The conversion behavior is consistent with changes in the physical structure and cross linking reactions because of drying. Thermal and microwave drying appear to cause a collapse in the pore structure, thus preventing donor solvents such as tetralin from contacting reactive sites inside the coals. Chemical dehydration does not appear to collapse the pore structure.more » From the study of the kinetics of the chemical dehydration of coals, it was possible to quantify the amount of water on the surface, the amount readily accessible in pores, and the amount more strongly bonded in the internal structure of the coals. The results indicate that high-rank coals have proportionally less surface and easily accessible water than the lower rank coals.« less

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Western Research Inst., Laramie, WY (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
85192
Report Number(s):
DOE/PC/91043-T13
ON: DE95015452
DOE Contract Number:  
AC22-91PC91043; FG22-91PC91310; FG05-89ER75506
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: Feb 1995
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; COAL; DRYING; NMR SPECTRA; COAL LIQUEFACTION; YIELDS; PROGRESS REPORT; BENCH-SCALE EXPERIMENTS; EXPERIMENTAL DATA; COAL RANK

Citation Formats

Miknis, F P, Netzel, D A, Wallace, Jr, J C, Butcher, C H, Mitzel, J M, and Turner, T F. An investigation of the role of water on retrograde/condensation reactions and enhanced liquefaction yields. Final report. United States: N. p., 1995. Web. doi:10.2172/85192.
Miknis, F P, Netzel, D A, Wallace, Jr, J C, Butcher, C H, Mitzel, J M, & Turner, T F. An investigation of the role of water on retrograde/condensation reactions and enhanced liquefaction yields. Final report. United States. https://doi.org/10.2172/85192
Miknis, F P, Netzel, D A, Wallace, Jr, J C, Butcher, C H, Mitzel, J M, and Turner, T F. 1995. "An investigation of the role of water on retrograde/condensation reactions and enhanced liquefaction yields. Final report". United States. https://doi.org/10.2172/85192. https://www.osti.gov/servlets/purl/85192.
@article{osti_85192,
title = {An investigation of the role of water on retrograde/condensation reactions and enhanced liquefaction yields. Final report},
author = {Miknis, F P and Netzel, D A and Wallace, Jr, J C and Butcher, C H and Mitzel, J M and Turner, T F},
abstractNote = {While great strides have been made in developing the technology of coal liquefaction processes in recent years, many unsolved problems still remain before a viable and economical process can be achieved. The technological problems that still exist can be solved through a more fundamental understanding of the chemistry associated with each stage of the coal liquefaction process, starting with any pretreatment steps that may be carried out on the coal itself. Western Research Institute, under the a contract from the US Department of Energy, has conducted a study of different methods of coal drying as pretreatment steps before liquefaction. The results of that study are the subject of this report. Coals that were dried or partially dried thermally and with microwaves had lower liquefaction conversions than coals containing equilibrium moisture contents. However, chemically dried coals had conversions equal to or greater than the premoisturized coals. The conversion behavior is consistent with changes in the physical structure and cross linking reactions because of drying. Thermal and microwave drying appear to cause a collapse in the pore structure, thus preventing donor solvents such as tetralin from contacting reactive sites inside the coals. Chemical dehydration does not appear to collapse the pore structure. From the study of the kinetics of the chemical dehydration of coals, it was possible to quantify the amount of water on the surface, the amount readily accessible in pores, and the amount more strongly bonded in the internal structure of the coals. The results indicate that high-rank coals have proportionally less surface and easily accessible water than the lower rank coals.},
doi = {10.2172/85192},
url = {https://www.osti.gov/biblio/85192}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Feb 01 00:00:00 EST 1995},
month = {Wed Feb 01 00:00:00 EST 1995}
}