Análisis de la refinación de glicerina obtenida como coproducto en la producción de biodiésel

Ingeniería y Universidad 01/2010;
Source: DOAJ

ABSTRACT This work discusses a number ofaspects related to glycerin-relatedproduction, market, and applicationin commercial products. Three mainqualities of commercial glycerin areevaluated: raw glycerin (80-88 wt %),technical grade glycerin (98 wt %),and refined glycerin (USP or FCC,99.7 wt %). Purification schemes foreach glycerin quality are simulated.This study shows that, after purificationprocess, it is possible to obtainmethanol at 99 wt %, which canbe recycled for biodiesel production.Simulation results show that the purifyingglycerin to obtain different levelsof purity can be economically feasible,and that market quality specificationscan be reached as well.

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    • "Currently there is renewed interest by improving the glycerin purification processes, had been developed several methods to this aim, as the use of exchange resins [8], acidification and extraction process [9] [10]. In order to purify the glycerin obtained as byproduct of biodiesel production, it has carried out the vacuum distillation of the glycerin rich phase [11] for decreasing the temperature distillation and to avoid the material thermal decomposition [4], thereby, currently the most used glycerin purification process is the vacuum distillation in inert atmosphere, process where is obtained glycerin with the characteristics required by the USP grade [12]. "
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    ABSTRACT: Given the growth in biodiesel production and other biofuels, it involves large volumes of byproducts which aren't suitable for commercial use. We studied the glycerol purification by vacuum distillation of the glycerol rich phase in the mixture reaction at the end of the biodiesel production process. Since glycerin is one of those byproducts, useful and plentiful, therefore the options to purify this one and achieve its better trading benefit are interesting. The process was monitored by 1 H NMR and showed that by vacuum fractional distillation of the glycerin rich phase of the biodiesel production it was possible to obtain pure glycerin between 97.4% and 98.9% on dry basis with 49.0% yield. Vacuum distillation without fractionation was inconvenient because it generates thermal degradation of the material and causes the formation of foam which induces low yield of glycerin and hinders the operation progress. Nomenclature t: Descending time in Stokes viscosity determination r: Sphere radio in Stokes viscosity determination g: Constant acceleration of the local gravity ES: Saponification Equivalent p: Sample weight in ES. N: Normality of HCl a: Volume of HCl required to neutralize the KOH in the assay blank b:: Volume of HCl required to neutralize the KOH in the assay with glycerin %AcONa: Sodium acetate G: Volume in mL of NaOH (aq) required to neutralize the acid in the distillate of the sample A: Volume in mL of NaOH (aq) required to neutralize the acid in the distillate of the reagent blank m: Mass, in mg, of raw glycerin in solution mmol compound: Number of milimols of the one compound V a : Volume of ρ a : Density of sample M a : Molar mass of the compound I a : Integral of the signal of acetone I a : Integral of the signal of the specific group in the compound n i : Number of atoms in the quantified component Greek Letters µ: Dynamic viscosity ρ: Density


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