Production of biodiesel using expanded gas solvents

C - Chemistry – Metallurgy – 07 – C

Patent

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C07C 51/43 (2006.01)

Patent

CA 2607931

A method of producing an alkyl ester. The method comprises providing an alcohol and a triglyceride or fatty acid. An expanding gas is dissolved into the alcohol to form a gas expanded solvent. The alcohol is reacted with the triglyceride or fatty acid in a single phase to produce the alkyl ester. The expanding gas may be a nonpolar expanding gas, such as carbon dioxide, methane, ethane, propane, butane, pentane, ethylene, propylene, butylene, pentene, isomers thereof, and mixtures thereof, which is dissolved into the alcohol. The gas expanded solvent may be maintained at a temperature below, at, or above a critical temperature of the expanding gas and at a pressure below, at, or above a critical pressure of the expanding gas.

L'invention concerne un procédé de fabrication d'un ester alkylique. Ce procédé consiste à faire intervenir un alcool et un triglycéride ou acide gras. Un gaz de dilatation est dissout dans de l'alcool pour former un solvant dilaté par gaz. L'alcool réagit avec le triglycéride ou l'acide gras dans une seule phase pour former l'ester alkylique. Le gaz de dilatation peut être un gaz de dilatation non polaire, tel que le dioxyde de carbone, le méthane, l'éthane, le propane, le butane, le pentane, l'éthylène, le propylène, le butylène, le pentène, les isomères associés, ainsi que des mélanges de ceux-ci, qui se dissout dans l'alcool. Le solvant dilaté par gaz peut être maintenu à une température inférieure, égale ou supérieure à une température critique du gaz de dilatation et à une pression inférieure, égale ou supérieure à une pression critique du gaz de dilatation

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