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AssigneeThe United States of America as represented by the Secretary of Agriculture
InventorsMichael J. Haas, Karen M. Scott, Paul J. Michalski, Stan Runyon
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The present invention relates to a method for producing fatty acid alkyl esters, involving esterifying a material containing free fatty acids (FFA) with an alcohol and an inorganic acid catalyst to form a product containing fatty acid alkyl esters, wherein (i) the material contains at least about 40% FFA and is produced by reacting a feedstock with steam and sulfuric acid at a pH of about 1-about 2 or (ii) the material contains at least about 80% FFA and is produced by reacting a feedstock with steam and alkali at a pH of about 11-about 13 and further reacting the feedstock with steam and sulfuric acid at a pH of about 1-about 2. The feedstock may be selected from the oils or soapstocks of soy, coconut, corn, cotton, flax, palm, rapeseed/canola, safflower, sunflower; animal fats; waste greases; and mixtures thereof; or other fully or partially hydrolyzed preparations of such feedstocks. The present invention also relates to a method for producing a lipid rich composition containing at least about 80% FFA, the method involving reacting a feedstock with steam and alkali at a pH of about 11-about 13 and further reacting the feedstock with steam and sulfuric acid at a pH of about 1-about 2. The feedstock may be selected from soy, coconut, corn, cotton, flax, palm, rapeseed/canola, safflower, sunflower, animal fats, waste greases, and mixtures thereof. The feedstock may be selected from the oils or soapstocks of soy, coconut, corn, cotton, flax, palm, rapeseed/canola, safflower, sunflower; animal fats; waste greases; and mixtures thereof; or other fully or partially hydrolyzed preparations of such feedstocks. Furthermore, the present invention concerns a lipid rich composition containing at least about 80% FFA.
A method for producing a lipid rich composition comprising at least about 80% free fatty acids, said method comprising reacting a feedstock with steam and alkali at a pH of about 10-about 14 and further reacting said feedstock with steam and sulfuric acid at a pH of about 1-about 2;
A lipid rich composition comprising at least about 80% free fatty acids.
A lipid rich composition comprising at least about 80% free fatty acids, said composition produced by a method comprising reacting a feedstock with steam and alkali at a pH of about 10-about 14 and further reacting said feedstock with steam and sulfuric acid at a pH of about 1-about 2.
A method for producing fatty acid alkyl esters, comprising esterifying a material containing free fatty acids with an alcohol and an inorganic acid catalyst to form a product containing fatty acid alkyl esters, wherein (i) said material contains at least about 40% FFA and is produced by reacting a feedstock with steam and sulfuric acid at a pH of about 1-about 2 or (ii) said material contains at least about 80% FFA and is produced by reacting a feedstock with steam and alkali at a pH of about 10-about 14 and further reacting said feedstock with steam and sulfuric acid at a pH of about 1-about 2.
Dependencies are inferred from the claim text.