共查询到20条相似文献,搜索用时 62 毫秒
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以全玉米粉为原料,对生料发酵乙醇的工艺进行研究,通过单因素实验以及响应面优化实验探讨原料粒度、底物浓度、生料酶添加量以及糖化酶添加量等因素对发酵的影响。结果表明,全玉米粉生料发酵乙醇的最佳工艺条件为50目全玉米粉为原料,底物浓度为37%,生料酶1.25%(w/w),加入酵母活化液(干酵母加量0.05%),并添加氮源尿素以及青霉素,恒温32℃发酵85 h,酒份能够达到19.86%(v/v),淀粉利用率为90.25%,响应面分析R-sq80%,R-sq(调整)80%,表示所建立的模型对异变有足够的解释能力。 相似文献
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研究了利用木薯酒精厂废渣为原料发酵生产乙醇的方法,结果表明:经过简单的机械粉碎后,通过同步糖化发酵生产乙醇是可行的。发酵条件为:木薯酒精渣经粉碎后取粒径小于0.85mm的部分,初始料水比1∶8,纤维素酶添加量为每克木薯渣(干重)30FPU,发酵过程中在24h内分批将剩余木薯渣加入至总料水比达到1∶2.5,利用5L发酵罐进行同步糖化发酵,发酵液中乙醇质量浓度达到52g/L,木薯酒精渣到乙醇的收率达到13%。纤维素酶的添加量对发酵效果影响显著,当达到每克木薯渣(干重)50FPU时,发酵液中乙醇质量浓度可达65g/L,乙醇收率达到16%。 相似文献
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笔者于2006年5月参与了内蒙古某水泥公司电石渣100%替代石灰石生产水泥熟料生产线的建设,该2500t/d生产线于2008年1月8日点火投产,目前生产运行已较为稳定。2008年10月笔者到内蒙古君正化工公司参与电石渣综合利用的2500t/d生产线工程建设,该工程目前正处于建设阶段。 相似文献
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Simultaneous saccharification and fermentation of alkaline-pretreated corn stover to ethanol using a recombinant yeast strain 总被引:1,自引:0,他引:1
Bio-ethanol converted from cheap and abundant lignocellulosic materials is a potential renewable resource to replace depleting fossil fuels. Simultaneous saccharification and fermentation (SSF) of alkaline-pretreated corn stover for the production of ethanol was investigated using a recombinant yeast strain Saccharomyces cerevisiae ZU-10. Low cellobiase activity in Trichoderma reesei cellulase resulted in cellobiose accumulation. Supplementing the simultaneous saccharification and fermentation system with cellobiase greatly reduced feedback inhibition caused by cellobiose to the cellulase reaction, thereby increased the ethanol yield. 12 h of enzymatic prehydrolysis at 50 °C prior to simultaneous saccharification and fermentation was found to have a negative effect on the overall ethanol yield. Glucose and xylose produced from alkaline-pretreated corn stover could be co-fermented to ethanol effectively by S. cerevisiae ZU-10. An ethanol concentration of 27.8 g/L and the corresponding ethanol yield on carbohydrate in substrate of 0.350 g/g were achieved within 72 h at 33 °C with 80 g/L of substrate and enzyme loadings of 20 filter paper activity units (FPU)/g substrate and 10 cellobiase units (CBU)/g substrate. The results are meaningful in co-conversion of cellulose and hemicellulose fraction of lignocellulosic materials to fuel ethanol. 相似文献
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Tong Wang 《Lipid Technology》2008,20(9):203-207
Removing oil from by‐products of corn fermentation is desirable for improving feed quality and providing an alternative source of oil for biodiesel production. We are investigating ways to increase oil removal by centrifugation during the typical dry grind fermentation process. We have to first make oil or oil containing “bodies” go into the liquid phase and then free the oil so it can be separated by centrifugation. This report outlines our research approaches and results. 相似文献
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微生物发酵制备生物柴油油脂原料工艺条件的研究 总被引:8,自引:0,他引:8
以一株酵母菌为产油菌株,研究了在1 L发酵罐中发酵油脂的工艺条件,以苏丹黑染色法定量分析油脂,并对发酵油脂组成进行了气相色谱-质谱联用分析.结果表明发酵罐最佳培养条件为30℃,通气量1.1 vvm,pH=6,转速300r/min.分析表明发酵油脂中含有多种不饱和脂肪酸,其中软脂酸17.80%、硬脂酸10.27%、油酸53.02%、亚油酸5.29%,这与植物油组成相似.同时以微生物发酵油脂为原料,初步研究了碱催化制备生物柴油. 相似文献
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The influence of NH4HF2 fluorinating agent on the yield of ammonium hexafluorosilicate intermediate product and amorphous silica in the fine purification of silica-containing raw material by the fluoride technology has been studied. Mixtures with different fluorinating agent contents were investigated by synchronous thermal analysis. The determination of the phases of intermediate products at various ratios of starting silica-containing raw material and NH4HF2 was carried out by the X-ray phase analysis method. The optimal ratio of components for the preparation of ammonium hexafluorosilicate and amorphous silica with maximal yield and purity level of the final products was determined. 相似文献