Exxon Donor Solvent liquefaction process

1981 ◽  
Vol 300 (1453) ◽  
pp. 141-156 ◽  
Keyword(s):  
Chemical Reactions ◽  
Pilot Plant ◽  
Process Development ◽  
Coal Liquefaction ◽  
Process Conditions ◽  
Donor Solvent ◽  
Plant Stage ◽  
Liquefaction Process ◽  
Direct Liquefaction

The Exxon Donor Solvent (EDS) coal liquefaction system is a direct liquefaction procedure being developed by the Exxon Corporation. Coal is chemically reacted and dissolved in a recycle solvent that is hydrogenated between passes to the liquefaction reactor. More than 2.6 barrels (0.41 m 3) of a synthetic crude boiling below 1000 °F (538 °C) are produced per ton (0.907 t) of dry, high volatile coal feed. Other ranks of coal can be effectively liquefied. The process development has proceeded to a 250 ton/day (227 t/day) pilot plant stage that went into operation in June 1980. The presentation addresses the chemical reactions and process conditions that result in ease of operability and flexibility of the EDS process.

Coal feed flexibility in the Exxon Donor Solvent coal liquefaction process

Fuel ◽  
1981 ◽  
Vol 60 (9) ◽  
pp. 788-794 ◽  
Author(s):  
John W. Taunton ◽  
K.L. Trachte ◽  
R.D. Williams
Keyword(s):  
Coal Liquefaction ◽  
Donor Solvent ◽  
Liquefaction Process

scholarly journals Theoretical Study on the Mechanism of Hydrogen Donation and Transfer for Hydrogen-Donor Solvents during Direct Coal Liquefaction

Catalysts ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 648 ◽  
Author(s):  
Haigang Hao ◽  
Tong Chang ◽  
Linxia Cui ◽  
Ruiqing Sun ◽  
Rui Gao
Keyword(s):  
Density Functional ◽  
Hydrogen Gas ◽  
Hydrogen Donor ◽  
Coal Liquefaction ◽  
Hydrogen Atoms ◽  
Functional Theory ◽  
Donor Solvent ◽  
National Energy Security ◽  
Liquefaction Process ◽  
Direct Coal Liquefaction

As a country that is poor in petroleum yet rich in coal, it is significant for China to develop direct coal liquefaction (DCL) technology to relieve the pressure from petroleum shortages to guarantee national energy security. To improve the efficiency of the direct coal liquefaction process, scientists and researchers have made great contributions to studying and developing highly efficient hydrogen donor (H-donor) solvents. Nevertheless, the details of hydrogen donation and the transfer pathways of H-donor solvents are still unclear. The present work examined hydrogen donation and transfer pathways using a model H-donor solvent, tetralin, by density functional theory (DFT) calculation. The reaction condition and state of the solvent (gas or liquid) were considered, and the specific elementary reaction routes for hydrogen donation and transfer were calculated. In the DCL process, the dominant hydrogen donation mechanism was the concerted mechanism. The sequence of tetralin donating hydrogen atoms was α-H (C1–H) > δ-H (C4–H) > β-H (C2–H) > γ-H (C3–H). Compared to methyl, it was relatively hard for benzyl to obtain the first hydrogen atom from tetralin, while it was relatively easy to obtain the second and third hydrogen atoms from tetralin. Comparatively, it was easier for coal radicals to capture hydrogen atoms from the H-donor solvent than to obtain hydrogen atoms from hydrogen gas.

scholarly journals Flash pyrolysis coal liquefaction process development. Quarterly report, July--September 1976

1976 ◽  
Author(s):  
E. W. Knell ◽  
P. E. Gethard ◽  
B. W. Shaw ◽  
N. W. Green ◽  
S. A. Qader
Keyword(s):  
Process Development ◽  
Coal Liquefaction ◽  
Flash Pyrolysis ◽  
Liquefaction Process
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