Study On Chemical Modification Of Enzymatic Hydrolysis Residues Of Fuel Ethanol Production From Corn Stalk

With the rapid development of economic, the contradiction of demanding for energy andthe growing contradictions about the conventional energy supply become more serious. So,more and more countries in the world concern about the clean, friendly and renewablecharacteristics of the cellulosic bio-ethanol. However, the remaining product after its productionhas not been a good application and development so far, to be combusted as fuel mostly,resulting in huge waste and pollution.Enzymatic residue of cellulose fuel ethanol is used as raw materials in this thesis. Theenzymatic residue of cellulose fuel ethanol through sulphonation, etherification, also beammoniated modified, improving the performance of the lignin and provide the theory of theexploitation about the enzymatic hydrolysis residues of cellulose.The main research including:Sulfonation part, changing the reaction conditions such as degree of sulfitation, volumeof NaOH, reaction time and get the lignosulfonate. Lignosulfonate and the epichlorohydrin arereacted, changing the reaction conditions such as ratio of epichlorohydrin, volume of NaOH,reaction time and temperature. Oxiammonolysis part, changing the reaction conditions such asratio of H2O2, volume of NaOH, reaction time and get the lignin polymer.The main results were listed as follows:1. The optimum reaction conditions of this performance: the total alkali dosage:14%(Na₂O),time3h, degree of sulfitation70%. Under these conditions, the performance of lignosulfonatewas as follows: content of sulfonate group2.79mmol/g, surface tension of solutions43.9mN/m.2. The optimum reaction conditions: lignosulfonate10g, the epichlorohydrin dosage is200%, the sodium hydroxide dosage is2%, temperature70℃, time3h, Under these conditions,the performance of it can get the best surface tension40.8mN/m.3. The reaction product was characterized by FTIR, which showed a strong peak at910cm^-1attributed to the epoxy group, and confirmed the grafting reaction between epoxychloropropane and lignosulfonate.4. The optimal conditions for enzymatic hydrolysis residue lignin ammoniated: rawmaterials10g, the temperature100℃, time2h, hydrogen peroxide dosage6%, ammonia dosage8%, Under these conditions, the nitrogen content be up to10.19%.