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玉米秸秆经过预处理后,发酵制备乙醇,可以缓解现阶段不断加剧的能源危机和粮食短缺问题。采用“液化技术”对玉米秸秆进行预处理,将用于发酵制备乙醇的纤维素分离,提高了乙醇的产率。液化后的木素等作为一种新的化学原料,经适当的化学修饰可以制备涂料、黏合剂等高附加值的化工产品,实现了玉米秸秆的全利用。考察了液化温度、液化时间、液比(m苯酚∶m绝干玉米秸秆)、催化剂用量等对液化产物中纤维素含量的影响。结果表明:反应温度100℃、液化时间90min、催化剂98%硫酸用量1mmol/g(绝干玉米秸秆)、液比3∶1时,液化产物中纤维素含量可以达到68.8%。扫描电镜结果显示预处理后的纤维素粒度明显降低,表面光滑且伴有空洞,有利于糖化过程。
After pretreatment of corn stalks, ethanol production by fermentation can ease the current energy crisis and food shortage which are aggravating at this stage. Using “liquefaction technology” pretreatment of corn stalks, the cellulose used for fermentation to produce ethanol is separated and the yield of ethanol is increased. Liquefied lignin as a new chemical raw materials, the appropriate chemical modification can be prepared coatings, adhesives and other high value-added chemical products, to achieve the full utilization of corn stalks. The effects of liquefaction temperature, liquefaction time, liquid ratio (m phenol: m absolute dry corn stover) and the amount of catalyst on the cellulose content in liquefied products were investigated. The results showed that the content of cellulose in the liquefied product could reach 68.8% when the reaction temperature was 100 ℃, the liquefaction time was 90 min, and the amount of catalyst 98% sulfuric acid was 1 mmol / g (absolute dry corn stalk). Scanning electron microscopy results showed that the pretreatment of the cellulose particle size was significantly reduced, the surface smooth and associated with the cavity, is conducive to the saccharification process.