【摘要】 以稻草为原料,高压酸水解法制备乙酰丙酸,采用气相色谱法测定水解液中乙酰丙酸的含量,考察了反应温度、反应时间、固液比和硫酸质量分数对乙酰丙酸得率的影响,通过单因素试验确定了最佳水解条件。结果表明,在高压1.6 MPa条件下,反应温度170℃,反应时间60 min,固液比1∶10,硫酸的质量分数为5%时,所制得乙酰丙酸得率为24.35%,此条件下水解残渣中纤维素和多戊糖均已完全反应。更多还原

【Abstract】 Levulinic acid was prepared by the method of highpressure acid hydrolysis of rice straw.The purity of levulinic acid was determined by gas chromatography.The influences of the reaction temperature,reaction time,solid-liquid ratio and acid concentration on the yield of levulinic acid were investigated.The single factor experimental results showed that when the temperature was 170 ℃,the solid-liquid ratio was 1∶10 and the acid concentration was 5 % by mass,the yield of levulinic acid was 24.35 %.At this optimal hydrolysis condition,no cellulose or pentosan was detected in the hydrolyzed residue.更多还原