NOVELTY - Producing biocombustible and biofuel mixtures suitable for different conditions of use, involves: (a) pre-treating lipid-based vegetable or animal materials; (b) mixing the esterified product of the used food oil and/or animal fats in a proportion of not not greater than 20% with dried refined oil; (c) producing mixtures of fatty acid alkyl esters and glycerine; and (d) separating the mixtures obtained from step (c) of transesterification into a phase containing raw glycerine and a phase containing the mixtures of fatty acid alkyl esters and the excess amount of lower alcohols or bioalcohols.    USE - The process is useful for producing biocombustible and biofuel mixtures suitable for different conditions of use (claimed), e.g. used in turbogas engine, an internal combustion engine, a fuel cell, a burner, for applications in the fields of land, sea or air transportation, mechanical or electrical energy production or heating systems.    ADVANTAGE - In the process, the excess amount of lower alcohols/bioalcohols can be partially or completely recovered from the obtained mixture, or the mixture itself may be integrated with additional quantities of the same or different lower alcohols/bioalcohols, thus yielding combustible products and ecological fuels suitable for various environmental conditions and for the types of apparatus and engines they must be employed in. The process offers a product of higher quality and purity compared to conventional processes, with lower residual glycerol content and humidity, and yielding a glycerine by-product directly of 95-98% purity.    DETAILED DESCRIPTION - Producing biocombustible and biofuel mixtures suitable for different conditions of use, involves: (a) pre-treating lipid-based vegetable or animal materials, where the lipid-based vegetable or animal materials comprises used food oil and/or animal fats and at least one of raw vegetable oil and refined vegetable oil, and where the pre-treatment involves: (i) if using the raw vegetable oil, subjecting the raw vegetable oil to a preliminary depuration and refining treatment to remove impurities and to neutralize and winterize the raw vegetable oil, and drying of the refined oil thus obtained; (ii) if using the refined vegetable oil, subjecting the refined vegetable oil to preliminary drying; and (iii) subjecting the used food oil and/or animal fats to a preliminary depuration treatment, drying and an esterification of the free fatty acids contained by addition of lower alcohols or bioalcohols to obtain an esterified product of the used food oil and/or animal fats; (b) mixing the esterified product of the used food oil and/or animal fats in a proportion of not not greater than 20% with dried refined oil obtained from steps (i) and/or (ii); (c) producing mixtures of fatty acid alkyl esters and glycerine by transesterification of the product of step (b) with lower alcohols of bioalchohols in excess; and (d) separating the mixtures obtained from step (c) of transesterification into a phase containing raw glycerine and a phase containing the mixtures of fatty acid alkyl esters and the excess amount of lower alcohols or bioalcohols. The final biocombustible and biofuel mixture contains mixtures of fatty acid alkyl esters and a calibrated quantity of alcohols and/or bioalcohols. An INDEPENDENT CLAIM is included for a biocombustible or biofuel mixture comprising variable amounts of: (I) fatty acid alkyl esters obtainable by transesterification starting from lipid-based vegetable or animal materials subjected to preliminary treatments including drying, and from lower alcohols or bioalcohols; and (II) lower alcohols or bioalcohols or their mixtures.