PROCESS FOR PREPARING A BIOETHANOL FUEL

• Main Authors: FRANCISC PETER, BALCU IONEL, MIRICA MARIUS CONSTANTIN, IORGA MIRELA IOANA, GHERMAN VASILE DANIEL, MACARIE AMALIA CORINA, SEGNEANU ADINA ELENA
• Format: Patent
• Language: English; Romanian
• Published: 30.05.2012
• Subjects: ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE ORUNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; CHEMISTRY; FIRELIGHTERS; FUELS; FUELS NOT OTHERWISE PROVIDED FOR; LIQUEFIED PETROLEUM GAS; LUBRICANTS; METALLURGY; NATURAL GAS; PEAT; PETROLEUM, GAS OR COKE INDUSTRIES; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BYSUBCLASSES C10G, C10K; TECHNICAL GASES CONTAINING CARBON MONOXIDE

The invention relates to a process for preparing a bioethanol fuel. According to the invention, the process consists in pretreating the lignocellulose mass in a single step with NaOH solution, sulphuric or phosphoric acid for 30 minutes in an autoclave at a pressure of 2 bar, then the biomass is washed with 12 volumes of water and neutralized with sodium carbonate in order to remove the inhibitory compounds, is hydrolyzed with 0.82% HCl solution for 10...60 min at a temperature of minimum 100°C, the hydrolysate solution with a content of 53...95% fermentable monosaccharides is brought into contact with 10...100 μl of a mixture of fermentation microorganisms of the cellulase type produced by the enzyme Tricoderma viridae, and the cellobiase type from a culture extract of Aspergillus niger at a pH 2...6 for 96 h, at a temperature of 50°C, there being obtained a residual material which is used as fertilizer and an alcohol solution containing 50...75% bioethanol which is subjected to distillation, there resulting a bioethanol of a purity of 99...99.5 %, with an energetic content of 30 MJ/kg and an octane number of 89...100. Invenţia se referă la un procedeu de obţinere a unui combustibil bioetanol . Procedeul conform invenţiei constă din pretratarea masei lignocelulozice într-o singură fază cu soluţie de NaOH, acid sulfuric sau acid fosforic, timp de 30 min, într-o autoclavă la presiune de 2 bari, după care biomasa este spălată cu 12 volume de apă şi se neutralizează cu carbonat de sodiu, pentru îndepărtarea compuşilor inhibitori, se hidrolizează cu soluţie 0,82% de HCl, timp de 10...60 min, la o temperatură de minimum 100°C, soluţia de hidrolizat cu un conţinut de 53...95% monozaharide fermentabile este pusă în contact cu 10...100 μl amestec de microorganisme de fermentaţie de tip celulaze, produse de enzima, şi celobiaze, din extract de cultură de, la unH=2...6, timp de 96 h la 50°C, obţinându-se un material rezidual care se utilizează ca fertilizator şi o soluţie alcoolică conţinând 50...75% bioetanol, care se supune distilării, rezultând un bioetanol de puritate 99...99,5%, cu un conţinut energetic de 30 MJ/kg şi o cifră octanică 89...100.