Oil-replacement additive for reducing emissions from two-stroke engines

Abstract

An oil-replacement additive for two-stroke engine fuel capable of reducing fuel consumption, enhancing combustion and reducing emissions comprises boron and a carrier, wherein the boron concentration in said additive is in the interval of 100 to 600 ppm, the carrier comprises an alcohol, the amount of oil in the additive is less than 10% (w/w), and the balance is a fuel. Most preferably said additive is substantially oil-free. A two-stroke fuel comprising said additive, and a significantly reduced amount of oil, or substantially no oil, said fuel having a boron concentration in the interval of about 1 to 12 ppm.

1 . An oil-replacement additive for two-stroke engine fuel, said additive comprising boron and a carrier, wherein the boron concentration in said additive is in the interval of 1 to 600 ppm, the carrier comprises an alcohol, the amount of oil in the additive is less than 10% (w/w), and the balance is a fuel. 
     
     
         2 . The additive according to  claim 1 , wherein the amount of oil in the additive is less than 8% (w/w). 
     
     
         3 . The additive according to  claim 1 , wherein the amount of oil in the additive is less than 1% (w/w). 
     
     
         4 . The additive according to  claim 1 , wherein said alcohol is chosen from methanol, ethanol, propanol, and butanol, and said balance of fuel is a fuel having a flash point similar to that of the two-stroke fuel to which the additive is intended to be added. 
     
     
         5 . The additive according to  claim 1 , wherein the concentration of boron is in the interval of 10 to 600 ppm. 
     
     
         6 . The additive according to  claim 1 , wherein the concentration of boron is in the interval of 100 to 300 ppm. 
     
     
         7 . The additive according to  claim 1 , wherein the boron is added in the form of a stable boron solution prepared by dissolving a boron compound in an alcohol, followed by vigorous mixing and exclusion of particles larger than 100 nm. 
     
     
         8 . A two-stroke engine fuel comprising an additive according to  claim 1 , wherein the boron concentration in the fuel is in the interval of 1 to 12 ppm. 
     
     
         9 . The two-stroke engine fuel according to  claim 8 , wherein the boron concentration is in the interval of 1 to 6 ppm. 
     
     
         10 . The two-stroke engine fuel according to  claim 8 , wherein the boron concentration is about 2 to 3 ppm. 
     
     
         11 . The two-stroke engine fuel according to  claim 8 , wherein the fuel contains less than 1% oil (w/w). 
     
     
         12 . A method for reducing the emissions from a two-stroke engine, wherein an additive comprising boron dissolved in an alcohol, less than 10% oil (w/w), the balance being a fuel and the concentration of boron in said additive is the interval of 1 to 600 ppm, is added to the fuel. 
     
     
         13 . The method according to  claim 12 , wherein said additive is mixed into the fuel at a proportion of about 1 part additive to 100 parts fuel. 
     
     
         14 . The method according to  claim 12 , wherein said additive is injected into the cylinder together with fuel at a proportion or about 1 parts additive to 50 parts fuel. 
     
     
         15 . The method according to  claim 12 , wherein the additive is added in an amount resulting in reduced emissions of total hydrocarbons, CO and CO 2  with maintained lubrication of the engine. 
     
     
         16 . The additive according to  claim 1 , wherein the amount of oil in the additive is less than 6%(w/w). 
     
     
         17 . The additive according to  claim 1 , wherein the amount of oil in the additive is less than 2%(w/w). 
     
     
         18 . The additive according to  claim 1 , wherein the additive is substantially oil-free. 
     
     
         19 . The additive according to  claim 1 , wherein the concentration of boron is in the interval of 100 to 600 ppm. 
     
     
         20 . The method of  claim 12 , wherein said additive is the interval of 100 to 600 ppm.