수용성 셀룰로오스의 라디칼 분해 특성 및 메탄올 제조에 관한 연구

Abstract

Depolymerization and liquid phase radical oxidation were conducted with water soluble cellulose such as methyl cellulose(MC), carboxymethyl cellulose(CMC), hydroxypropyl methyl cellulose(HPMC), hydroxyethyl cellulose(HEC) and hydroxypropyl cellulose(HPC). Hydrogen peroxide and iron were added in the rotary evaporator by controlling the pressure and temperature. Many volatile carbons such as methanol, carbon dioxide, formaldehyde, acetaldehyde, formic acid, acetone, acetic acid and water were formed after radical oxidation it was found that major product is methanol through the GC-MS analysis. Among the water soluble cellulose, MC showed the highest yield of methanol analysed by internal standard quantitative method. The reactions of MC were performed under the conditions of 1 wt% to 15 wt% concentration dissolved in water added hydrogen peroxide 3 wt% and iron(III) sulfate 2 wt% reaction temperature from 90 to 140℃ step by increased 10℃, reaction pressure of 300 to 500 mbar, and reaction time of 1 to 4 hour. The highest methanol yield was obtained in the concentration of 350 mg/L at 90℃ while the portion of methanol was increased with up to 140℃ compound to the other volatile compounds. The concentration dependency for methanol forming increased from 1 wt% - 6 wt %. To find best reaction time we carried sampling and analysed the condensed liquid in every each 1 hour, the methanol yield was decreased during reaction time 1 to 4 hours.