A continuous acid-catalyzed steam explosion pretreatment process and system to produce cellulosic ethanol was developed at the pilot-scale. The effects of the following parameters on the pretreatment efficiency of rice straw feedstocks were investigated: the acid concentration, the reaction temperature, the residence time, the feedstock size, the explosion pressure and the screw speed. The optimal presteaming horizontal reactor conditions for the pretreatment process are as follows: 1.7 rpm and 100-110 °C with an acid concentration of 1.3% (w/w). An acid-catalyzed steam explosion is then performed in the vertical reactor at 185 °C for 2 min. Approximately 73% of the total saccharification yield was obtained after the rice straw was pretreated under optimal conditions and subsequent enzymatic hydrolysis at a combined severity factor of 0.4-0.7. Moreover, good long-term stability and durability of the pretreatment system under continuous operation was observed.

译文

在中试规模上开发了一种连续酸催化蒸汽爆炸预处理工艺和系统来生产纤维素乙醇。研究了以下参数对稻草原料预处理效率的影响: 酸浓度,反应温度,停留时间,原料尺寸,爆炸压力和螺杆速度。预处理过程的最佳预蒸水平反应器条件如下: 1.7 rpm和100-110 °C,酸浓度为1.3% (w/w)。然后在垂直反应器中在185 °C下进行酸催化的蒸汽爆炸2分钟。在最佳条件下预处理稻草并随后以0.4-0.7的综合严重度因子进行酶水解后,获得了约73% 的总糖化产率。此外,观察到预处理系统在连续运行下良好的长期稳定性和耐久性。

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