Method for preparing a synthetic fuel and/or synthetic components for fuels, and the product obtained thereby
AssigneeE.N.I. Ente Nazionale Idrocarburi
InventorsErmanno Girardi, Riccardo Mansani
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Abstract
Synthetic fuel and/or synthetic components for fuels are prepared from a mixture of aromatic polycarboxylic acids of suitable elementary composition, having a mean molecular weight of between 120 and 800 and an acidity of between 5 and 18 meq/g by partially decarboxylating them by heat treatment and subjecting the non-removed acidic functions to esterification with one or more alcohols or one or more olefins. This invention relates to a method for preparing a synthetic fuel and/or synthetic components for fuels, and the product obtained by said method.
Claims15
A method for preparing a synthetic fuel and/or synthetic components for fuel from a polycarboxylic acid mixture, or their alkaline metal salts, said method comprising subjecting a polycarboxylic acid mixture that is derived from the oxidation of coal and has the following elemental composition:
- carbon from 42% to 70% by weight
- hydrogen from 1.5% to 6% by weight
- oxygen from 14.0% to 52.7% by weight,
- a mean molecular weight of between 120 and 800, and an
- acidity of between 5 and 18 meq/g, to a partial decarboxylation process which comprises
- salifying in aqueous solution the acids with carbonates of alkaline or alkaline earth metals in the case that such acids are not already in their salt form, and then heating the solution of the salts for a time of between 10 and 30 minutes, to a temperature of between 300.degree. C. and 350.degree. C. in the presence of a cupric carbonate or cupric sulphate or mixture thereof, recovering the partially decarboxylated products by extraction with an organic solvent and thereafter esterifying the partially decarboxylated product with one or more alcohols comprising 1 to 10 carbon atoms or one or more olefins comprising 2-10 carbon atoms.
A method for preparing a synthetic fuel and/or synthetic components for fuel from a polycarboxylic acid mixture, or their alkaline or alkaline earth metal salts, said method comprising subjecting a polycarboxylic acid mixture that is derived from oxidation of coal and has the following elemental composition:
- carbon from 42% to 70% by weight
- hydrogen from 1.5% to 6% by weight
- oxygen from 14.0% to 52.7% by weight,
- a mean molecular weight of between 120 and 800, and an acidity of between 5 and 18 meq/g, to a partial decarboxylation process which comprises heating said carboxylic acid mixture or the mixture of their alkaline or alkaline earth metal salts in the absence of water at a temperature of between 350.degree. and 550.degree. C. for a time of between 10 and 30 minutes, in presence of metal transition oxides, and thereafter esterifying the partially decarboxylated product with one or more alcohols comprising 1 to 10 carbon atoms or one or more olefins comprising 2 to 10 carbon atoms.
Dependencies are inferred from the claim text.