Process for stabilization of coal liquid fractions

Patent · Thu Jan 01 00:00:00 EST 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

Related Subjects

process
stabilization
coal
liquid
fractions
fuels
stabilized
gum
formation
viscosity
increases
storage
permitting
fuel
burned
expensive
treatments
remove
gums
gum-forming
materials
accomplished
addition
cyclohexanol
simple
inexpensive
secondary
tertiary
alcohols
amines
ketones
liquids
levels
5-25
weight
respect
treated
particularly
effective
cost-efficient
stabilizer
stabilizers
isopropanol
diphenylmethanol
butanol
dipropylamine
triethylamine
diphenylamine
ethylmethylketone
cyclohexanone
methylphenylketone
benzophenone
experimental
data
indicate
achieved
breaking
hydrogen
bonds
phenols
preventing
retarding
oxidative
coupling
found
according
mixed
petroleum-derived
produce
mixtures
deposition
prevented
reduced
relative
similar
containing
experimental data
liquid fractions
coal liquids
coal liquid
liquid fuel
liquid fuels
liquid fraction
tertiary amine
oxidative coupling
particularly effective
forming material
forming materials
hydrogen bonds
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