查询词典 levulinic

Under the optimal conditions,the levulinic acid yield can reach(19.2%).

试验表明，原料粒度对乙酰丙酸的产率影响较小。

A mechanism model to describe the degradation of wheat straw to produce levulinic acid was suggested based on the analysis of experimental data obtained in this work and others from both domestic and international laboratories.

通过对小麦秸秆降解生产乙酰丙酸实验数据的分析并参考国内外类似的研究结果，提出了生物质水解生成乙酰丙酸的水解机理模型。

The results indicated that the selectivity of levulinic acid could be improved at a lower reaction temperature and a higher sulfuric acid concentration.

研究结果表明，降低温度和提高硫酸浓度有利于提高生成乙酰丙酸的选择性。

The effects of temperature, acid concentration, liquid/solid ratio, particle size and reaction time on the productivity of levulinic acid were evaluated.

我国是小麦生产大国之一，有丰富的小麦秸秆资源。

The stability of levulinic acid in near critical water was studied in the temperature range from 220 to 280 ℃and under pressure of 10 MPa.

实验测定了压力10MPa、温度220-280℃内乙酰丙酸在近临界水中的稳定性。

The progress on chemical synthesis and biosynthesis of levulinic acid and 5-aminolevulinic acid(5-ALA) were discussed.

基于生物质资源的利用和开发，论述了乙酰丙酸的制取、5-氨基乙酰丙酸的化学合成与生物合成，阐述了其在医药、农业等方面的应用，讨论了发展趋势和亟待解决的问题。

The work proved the possibility of substituting inorganic acid with strong acidic resins for levulinic acid preparation from biomass.

该研究结果证实了用耐水型强酸性树脂替代现有的无机酸催化制备乙酰丙酸的可能性。

In this work, the degradation process, mechanism, kinetics as well as the separation and purification of levulinic acid production from biomass, such as wheat straw and wood powder, were evaluated at high temperature and catalyzed by acid.

本文以麦秸和木屑等木质纤维素类的可再生资源为原料，对在高温及酸存在的条件下降解制备乙酰丙酸的工艺条件、生成机理、反应动力学及提取工艺进行了研究。

A verification experiment was performed and the productivity of levulinic acid was 19.86%, which is almost the same as the model prediction.

通过验证实验，在上述优化条件下乙酰丙酸产率达到了19.86％，与模型预测值19.75％十分吻合，原料中纤维素的利用率达到68.8％。

The content of levulinic acid in soy sauce,hydrolyzed vegetable proteinand caramel was determined.

对酱油、酸水解植物蛋白、焦糖色素中乙酰丙酸的含量进行了测定。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。