Conversão de glicose em Àcido Lático empregando hidróxidos duplos Lamelares e Peróxido de Hidrogênio

Abstract

To the growing need to reduce the use of fossil fuels, the conversion of saccharides, such as glucose,presents itself as a promising alternative to replace these resources, as it can be converted into a widerange of inputs for the chemical industry, with fructose, levulinic acid, glyceraldehyde, pyruvicaldehyde, HMF, lactic acid, among others. Among the potential products obtained from this conversion,lactic acid has wide applicability in various sectors of the industry. To this range of application, lacticacid moves on average in the economic market of approximately 2.9 billion, with the expected estimatefor 2025 of 10 billion. The current obtaining of lactic acid occurs through fermentation, but thistechnique presents some difficulties, such as high cost, long reaction times, low selectivity and lowtolerance to pH variations in the reaction medium. Its chemical conversion employs homogeneous andheterogeneous catalysts, in homogeneous catalysis, inorganic bases are used, in which an excess ofbase is required, and it is difficult to remove the reaction medium. For heterogeneous catalysis, metallicsolutions have been used, but these solutions have a high cost, are difficult to recover, and have a hightoxicity. The double lamellar hydroxide provides the combination of the presence of metals, easilyadjustable acidity/basicity, and low leaching; therefore, it becomes a promising catalyst for obtaininglactic acid from glucose. Several tests were carried out with several additions, in which solutions wereadded (NaOH and H2O2 2%), additions of HDL solids (Zn / Al, Mg / Al, Cu / Al), and their oxides obtainedby calcination. Glucose can be effectively converted into lactic acid by combining the addition (NaOH /H2O2 2% / Cu-Al 2: 1) at 60oC in 2h for which it was possible to obtain 14% of lactic acid under anoxygen atmosphere (aerobics). It was also possible to observe that the conversion of glucose in thepresence of HDL and the other additions proved to be effective for obtaining fructose, glyceraldehyde,pyruvaldehyde, lactic acid, and dihydroxyacetone, all of which are substances of high added value forthe chemical industry.