查询词典 levulinic

Glucose, formic acid and levulinic acid were not detected in the liquors of acid hydrolysis and the concentration of xylose and arabinose was high, while the acetic acid was low. The mixture of monosaccharides and fatty acid was efficiently separated and the whole process of separation was finished within 23 minutes.

通过对样品的分析表明，麦糟水解液中不含有葡萄糖、甲酸及乙酰丙酸，木糖和阿拉伯糖的质量浓度比较高，乙酸的质量浓度比较低，单糖及脂肪酸的混合液得到很好的分离，分离过程在23min内完成。

Glucose,formic acid and levulinic acid were not detected in the liquors of acid hydrolysis and the concentration of xylose and arabinose was high,while the acetic acid was low.

目前，国内外用高效液相色谱法测定糖类化合物已有许多报道[4-10]，但同时分析单糖及脂肪酸的报道仅在Solang等[3]的研究中略有叙述。

The decarboxylation of 5-hydroxymethylfurfural to levulinic acid is a key step in the preparation of levulinic acid from biomass.

5-羟甲基糠醛脱羧生成乙酰丙酸是生物质资源出发制备乙酰丙酸过程中的关键步骤之一。

The effects of levulinic concentration and flow rate of hydrolyzate as well as column height were examined. Hydrochloric acid was used as eluent and the effect of concentration and flow rate on the elution of levulinic acid was evaluated.

在此基础上，直接利用小麦秸杆水解液研究了在装有D301树脂的固定床上的穿透曲线和洗脱曲线，考察了进样浓度、空速和树脂装柱高度对穿透曲线的影响。

Using levulinic acid and phenol as raw materials, hydrochloric acid as catalyst and thioglycolic acid as assistant catalyst, the synthesis technology of diphenolic acid, a new polymer material substitution for biphenol A, was investigated.

研究了以苯酚和新型平台化合物乙酰丙酸为原料，采用盐酸为催化剂、巯基乙酸为助催化剂催化合成高分子材料单体双酚酸的合成工艺。

Key words: levulinic acid; catalyzed hydrolysis of furfuryl alcohol; hydrolysis of biomass

中图分类号：TQ073；TQ91 文献标识码：A 文章编号：0253-4320（2003）

Levulinic acid is a kind of new platform chemicals.

乙酰丙酸是一种新型的平台化合物。

Levulinic acid,which has good reactive activity,is an important green platform chemical.

乙酰丙酸具有良好的反应活性，是一种重要的绿色平台化合物。

Furthermore, the synthesis of diphenolic acid with levulinic acid as raw material was also studied.

并以合成双酚酸为例开展了乙酰丙酸的应用研究。

The production of by-products caused the productivity of levulinic acid lower than theoretical one. Based on the study of the degradation of glucose and the formation of 5-hydromethylfurfural and levulinic acid, a kinetic model was proposed, in which, the process was described by a series first-order reactions with parallel by-reaction.

在葡萄糖降解的初始阶段还存在着异构化和可逆反应，降解过程中形成了羟甲基糠醛、腐殖质、乙酰丙酸、甲酸和其它中间产物。

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。