| abstract |
Method for reducing the level of pollutants from the exhaust of a diesel engine comprising (1) operating said diesel engine using as fuel a diesel water-fuel emulsion in which the emulsifier is selected from the group consisting of: (i) at least one fuel soluble product prepared by reacting at least one hydrocarbyl-substituted carboxylic acid acylating agent with ammonia or an amine, the hydrocarbyl substituent of said acylating agent having 50 to 500 carbon atoms; (ii) a mixture of (i) and at least one of an ionic or non-ionic compound having a hydrophilic-lipophilic balance (HLB) of 1 to 40; (iii) a water-soluble compound selected from the group consisting of amine salts, ammonium salts, azide compounds, nitrate esters, nitramine, nitro compounds, alkali metal salts, alkaline earth metal salts, in combination with ( i), (ii) or at least one of an ionic or non-ionic compound having a hydrophilic-lipophilic balance (HLB) of 1 to 40; (iv) the reaction product of polyacid polymer with at least one fuel soluble product prepared by reacting at least one hydrocarbyl-substituted carboxylic acid acylating agent with ammonia, an amine or a polyamine, and (v) a mixture of at least one of an ionic or non-ionic compound having a hydrophilic-lipophilic balance (HLB) of 1 to 40 and (iv); wherein the diesel water-fuel composition comprises a discontinuous phase, the discontinuous phase being composed of aqueous drops having an average diameter of 1 micron or less; and (2) contacting the exhaust of said diesel engine with a particulate filter comprising a filter means, a regeneration system and a monitoring system, and in which the particulate filter is effective for particles in the range of 10 nanometers to 500 nanometers. |