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Title: Process for stabilization of coal liquid fractions

Abstract

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.

Inventors:
 [1];  [2]
  1. Boston, MA
  2. Alexandria, EG
Issue Date:
Research Org.:
Northeastern University (Boston, MA)
OSTI Identifier:
866398
Patent Number(s):
4702748
Assignee:
Northeastern University (Boston, MA)
Patent Classifications (CPCs):
C - CHEMISTRY C10 - PETROLEUM, GAS OR COKE INDUSTRIES C10L - FUELS NOT OTHERWISE PROVIDED FOR
DOE Contract Number:  
FG22-83PC60793
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
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; /44/

Citation Formats

Davies, Geoffrey, and El-Toukhy, Ahmed. Process for stabilization of coal liquid fractions. United States: N. p., 1987. Web.
Davies, Geoffrey, & El-Toukhy, Ahmed. Process for stabilization of coal liquid fractions. United States.
Davies, Geoffrey, and El-Toukhy, Ahmed. Thu . "Process for stabilization of coal liquid fractions". United States. https://www.osti.gov/servlets/purl/866398.
@article{osti_866398,
title = {Process for stabilization of coal liquid fractions},
author = {Davies, Geoffrey and El-Toukhy, Ahmed},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1987},
month = {1}
}

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