玉米芯制备木糖的工艺研究

Processes of producing xylose by corncob

中文关键词:  玉米芯  木糖  综合利用

英文关键词:corncob  xylose  comprehensive utilization

中文摘要:

      目的 研究玉米芯制备木糖的最佳工艺条件。方法 以颗粒状玉米芯为原料, 采用酸解法制备木糖, 选择不同的酸度、酸解温度、酸解时间和固液比, 以木糖提取率确定最佳工艺条件。结果 最佳工艺条件为: 酸解温度120 ℃，酸度1%, 玉米芯和工艺水的固液比1:10, 酸解时间2 h。水解液经活性炭脱色和离子交换后透光率大幅度提高, 在420 nm下透光率可达90%以上; 电导率大幅度降低, 说明去除了糖液的各种离子。结晶后木糖产率较高, 8 t玉米芯可产1 t成品木糖。结论 采用此工艺条件制备木糖, 木糖的产率较高。

英文摘要:

      Objective To investigate the best process conditions of producing xylose by corncob. Methods The granular corncob was used as raw material, and acid hydrolysis was used to produce xylose. Under different conditions of acidity, acidolysis temperature, acidolysis time or solid-liquid ratio, the optimal process conditions were confirmed based on xylose yield. Results The best process conditions of acidolysis were as follows: temperature was 120 ℃, acidity was 1%, the solid-liquid ratio of corncob and process water was 1:10, and the acidolysis time was 2 h. After decolorizing by activated carbon and ion exchange, the light transmittance of hydrolyzate at 420 nm could reach up to 90% and electrical conductivity decreased dramatically, which indicated that various ions were removed. The yield of xylose was higher after crystallization, and 8 ton of corncob xylose could produce 1 ton of xylose. Conclusion The productivity rate of xylose is high by using this process conditions.