排序方式: 共有37条查询结果,搜索用时 62 毫秒
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在线催化裂解精制生物质裂解油 总被引:3,自引:2,他引:1
以木屑为原料,在3种条件下分别制取快速裂解油、二次裂解油和在线精制油,并对三者进行了水分、元素组成、组分测定和分析.由分析结果知:在线精制油的水分含量最低(仅22%),氧含量最低为31.4%(文中百分数如无特殊说明均为质量分数),且其组分中含一或两个苯环的化合物的相对含量明显上升(接近17%).在线催化裂解条件下,比较了390、450和500℃ 3个温度的产物物性,500℃得到的生物质油的物性(密度、粘度、水分、元素组成)明显优于390℃和450℃两个温度下的产物. 相似文献
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提升管三相流化床内的气液传质系数 总被引:3,自引:0,他引:3
采用溶氧电极法测定了以牛顿和非牛顿流体为液相的提升管三相流化床的气液传质系数(kla)。证明其值受床层流动特性的影响显著,那些能提供高气含率和增大液体循环速率的操作条件也有助于kla的提高。通过引入广义雷诺数得出了计算牛顿和非牛顿流体内kla的关联式 相似文献
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研究了反应时间、液固比和反应气氛对水解木质素超临界降解液化的影响。通过分析产物的分布、碳氢含量和碳基的转化率及收率,表明在超临界乙醇溶液中,水解木质素在10min内就能被降解液化,反应时间的延长会导致缩合反应的加剧;液固比以10:1为宜,液固比的降低容易导致水解木质素降解不完全,而更高的液固比虽可使油分的总收率略微提高,但是溶剂用量增加,同时结果表明这是由于溶剂与木质素降解产物的反应所致。无论是在惰性气氛还是在氢气气氛下,在超临界乙醇溶剂中催化液化的结果基本一致,氢气气氛的存在无助于木质素的降解,只在一定程度上由于氢气的解理而使缩合反应有所减少。 相似文献
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Degradation Kinetics of Xylose and Glucose in Hydrolysate Containing Dilute Sulfuric Acid 总被引:3,自引:0,他引:3
In preparation of fuel alcohol from biomass as feedstock, hydrolysis with dilute acid as catalyst is one way to produce fermentable saccharide, xylose and glucose. However, the acid is also the catalyst in degradation of xylose and glucose and the yield of sacchride is dependent on the kinetic behaviors of saccharide. The degradation kinetics of xylose and glucose in the hydrolysate was investigated under the conventional process conditions of hydrogen ion concentration from 0.05 to 0.2 mol/L and temperature from 150 to 200℃. With a numerical calculation method, the kinetic parameters were estimated, and the activation energy of xylose and glucose in the degradation reaction was obtained. The kinetic equations correlating the effect of hydrogen ion concentration on the rate constants of degradation reaction were established. Comparison between the calculated results from the equations and experimental ones proved that the established kinetic model could satisfactorily predict the degradation behavior of xylose and glucose in the acidic hydrolysate. 相似文献