Ester-amides of polycarboxylic acids as rheological additives for coal- water slurries

摘要

Coal-water slurries containing a rheological additive are provided. Rheological additives employed for preparation of the coal- water slurries are ester-amide products obtained by reaction of a polycarboxylic acid with a polyether glycol and aliphatic amine. Salts of the ester-amides may also be advantageously employed as dispersants. The ester-amide additives are employed in an amount from about 0.1 to about 4 percent by weight of the slurry. Stable aqueous slurries containing from 60 to 80 percent by weight coal solids are produced.