NOVELTY - Producing high yield biodiesel using high acidity triglycerides with generation of glycerin 90% free of salts, comprises: (a) providing an esterified material; (b) adding methanol and a catalyst to the material, and stirring; (c) stopping the stirring for 30 minutes, and allowing the mixture to separate into an upper dark layer and a lower light layer; (d) transesterifying the lower layer and adding sodium methylate and then stirring; (e) stopping the stirring for 30 minutes; (f) treating the crude glycerin; (g) adding fatty acid; and (h) recovering fatty acid using an additive solution.    USE - The process is useful for the production of biodiesel, methyl esters for industrial use, solvents for agricultural purposes, glycerin (90%) and its derivatives unique selling proposition (USP) grade glycerin, 1,2 propanodiol, polyglycerin, polyglycerin esters, alkyd resins, epoxy resins and hydrogen source (all claimed).    ADVANTAGE - The process is capable of simply, economically and rapidly producing the biodiesel with high yield in an environmentally friendly manner.    DETAILED DESCRIPTION - Producing high yield biodiesel using high acidity triglycerides with generation of glycerin 90% free of salts, comprises: (a) providing an esterified material with an acidity index of 30 mg of potassium hydroxide/g; (b) adding methanol at a ratio of 20-40% mass/mass and a catalyst MW at a ratio of 0.1-0.5% mass/mass to the esterified material at a temperature of 45-65 degrees C, stirring the mixture until the acidity index reaches a value less than 2 mg of potassium hydroxide/g for a period of 60-240 minutes; (c) stopping the stirring for 30 minutes, allowing for the mixture to separate, where an upper layer is dark and is predominantly composed of methanol, water and coloring agents and a lower layer is light brown and primarily esterified fatty material and solubilized methanol; (d) transesterifying the lower layer, where methanol is added to correct the esterified methanol ratio to 15% mass/mass, and the transesterifying step further comprises heating the mixture to a temperature of 50-60 degrees C; adding sodium methylate, and stirring the mixture in a heating container until the mixed glycerin reaches a value of lower than 0.25% mass/mass; (e) stopping the stirring for 30 minutes, allowing the mixture to separate, where an upper layer is biodiesel having 98% conversion and a lower layer is crude glycerin having 50-65% of glycerol and containing free methanol, and fatty material comprises: soaps, esters, glycerides, moisture and/or mixtures and the lower layer is distilled to remove the free methanol; (f) treating the crude glycerin originating from steps (b) to (e); (g) adding fatty acid to the mixture, with an acidity index of 80-210 mg of potassium hydroxide/g at a temperature of 60-95 degrees C, which is previously stirred, adding the crude glycerin, stirring and maintaining the same reaction conditions for 30 minutes; (h) stopping the stirring for 30 minutes, allowing the mixture to separate, where an upper layer is fatty material containing soap, ester, glycerides and residual glycerol, a lower layer is glycerin having 95% of glycerol containing residue soap and moisture, the glycerol content depends on the water content and residue free methanol in the crude glycerin; (i) recovering fatty acid by making the upper layer to undergo a split of soap using an additive solution to reduce the effect of sulfuric acid on the formation of sulfonates and other agents that confers color to the recovered fatty layer; (j) stirring the mixture, in the upper layer, provided in a heating container at 50-80 degrees C; and then adding an additive solution containing a non ionic surfactant at 1% and at room temperature; and slowly adding sulfuric acid (98%), hydrolyzing the soap, and (k) stopping the stirring for 30 minutes at a temperature of 80 degrees C, allowing the mixture to separate, where an upper layer is fatty acid and ester with a moisture of 1% mass/mass; and a lower layer is water, additive, glycerin, sulfates and sulfonate compounds which are sent to effluent treatment. An INDEPENDENT CLAIM is included for the final product including glycerin (90%), free of inorganic salts, with material esterified from soybean oil, palm oil and tallow and having an acidity index of 30 mg of potassium hydroxide/g.