Process for stabilization of coal liquid fractions

Patent · 01 January 1987

OSTI ID:866398

Davies, Geoffrey ^[1]; El-Toukhy, Ahmed ^[2]

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1. Boston, MA
2. Alexandria, EG

Coal liquid fractions to be used as fuels are stabilized against gum formation and viscosity increases during storage, permitting the fuel to be burned as is, without further expensive treatments to remove gums or gum-forming materials. Stabilization is accomplished by addition of cyclohexanol or other simple inexpensive secondary and tertiary alcohols, secondary and tertiary amines, and ketones to such coal liquids at levels of 5-25% by weight with respect to the coal liquid being treated. Cyclohexanol is a particularly effective and cost-efficient stabilizer. Other stabilizers are isopropanol, diphenylmethanol, tertiary butanol, dipropylamine, triethylamine, diphenylamine, ethylmethylketone, cyclohexanone, methylphenylketone, and benzophenone. Experimental data indicate that stabilization is achieved by breaking hydrogen bonds between phenols in the coal liquid, thereby preventing or retarding oxidative coupling. In addition, it has been found that coal liquid fractions stabilized according to the invention can be mixed with petroleum-derived liquid fuels to produce mixtures in which gum deposition is prevented or reduced relative to similar mixtures not containing stabilizer.

• Research Organization: Northeastern University (Boston, MA)
• DOE Contract Number: FG22-83PC60793
• Assignee: Northeastern University (Boston, MA)
• Patent Number(s): US 4702748
• OSTI ID: 866398
• Country of Publication: United States
• Language: English

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