van Walsum G Peter, Shi Helen
Department of Environmental Studies and Glasscock Energy Research Center, Baylor University, PO Box 97266, Waco, TX 76798-7266, USA.
Bioresour Technol. 2004 Jul;93(3):217-26. doi: 10.1016/j.biortech.2003.11.009.
Carbonic acid and liquid hot water pretreatments were applied to corn stover. Temperatures ranged from 180 to 220 degrees C; reaction times varied between 2 and 32 min and prereaction carbon dioxide pressure was either 0 or 800 psig. Over the range of reaction conditions tested, it was found that the presence of carbonic acid had an effect of increasing the concentrations of xylose and furan compounds in the hydrolysate that was significant at above the 99% confidence level. Thus there appears to be an increase in the severity of the pretreatment conditions with the presence of carbonic acid. These results are contrary to previously reported results on aspen wood, where the presence of carbonic acid was not found to have an effect on either the xylose or furan concentrations. Although pretreatment conditions were more severe with the addition of carbonic acid, the presence of carbonic acid resulted in a hydrolysate with a higher final pH. Thus it appears that the higher severity conditions reduce the accumulation of organic acids in the hydrolysate. This result was consistent with previously reported work on carbonic acid pretreatment of aspen wood.
对玉米秸秆进行了碳酸和液态热水预处理。温度范围为180至220摄氏度；反应时间在2至32分钟之间变化，预反应二氧化碳压力为0或800 psig。在所测试的反应条件范围内，发现碳酸的存在对水解产物中木糖和呋喃化合物浓度有增加作用，在99%以上的置信水平上具有显著性。因此，随着碳酸的存在，预处理条件的强度似乎有所增加。这些结果与先前关于白杨木的报道结果相反，在白杨木中未发现碳酸的存在对木糖或呋喃浓度有影响。尽管添加碳酸后预处理条件更苛刻，但碳酸的存在导致水解产物的最终pH值更高。因此，似乎更高强度的条件减少了水解产物中有机酸的积累。这一结果与先前关于白杨木碳酸预处理的报道工作一致。
