丙酮化

Making use of propanone as solvent in this paper,it is decreased by 50% and 60% that SnCl_2 and 35%HCl consumption that the chloromethylenation-SnCl_2/HCl reduction process transform nature vitamin E into α-vitamin E,purification α-vitamin E is easier.

利用丙酮作溶剂，使氯甲基化 SnCl2/HCl还原工艺转化天然维生素E的SnCl2消耗降低了50%、35%盐酸消耗降低了60%，α VE提纯更容易。

The related feature of tribromide quaternary ammonium salt as selective bromide reagent was investigated by the reaction of acetophanone, propanone, phenol with self-made benzyl triethyl tribromide quaternary ammonium salt.

首次通过自制的苄基三乙基三溴季铵盐与苯乙酮、丙酮、苯酚等的反应，研究了三溴季铵盐作为选择性溴化剂的相关性能。

The title compound was synthesized from shikimic acid via eight steps, including esterification of acid, proctection of hydroxy etc., and partial procedure was modified for easy industrialization.

本论文参考文献方法，以莽草酸为原料，通过酯化，丙酮叉保护等六步反应合成了目标化合物，并对部分反应条件进行了优化。

The results show that the zirconium sol has good spinnability when n: n= 1:3, reaction time is 6h and aging temperature is 15℃. The ZrO_2precursor fibers are made from hydrous zirconia chelated by acetylacetone. The sintercd fibers arecomposed of metastable tetragonal phase and sized about 15μm in diameter. Moreover, there aremany pores inside the fibers, but no cracks.4. ZrO_2/PVP hybrid fibers were prepared by blending the spinnable zirconium sol and 10 wt%PVP solution.

结果表明，当n(ZrOCl_2·8H_2O)：n(H_2O_2)=1：3，反应时间6h，陈化温度15℃时可得纺丝性能良好的锆溶胶，ZrO_2前驱体连续纤维的组成主要为经乙酰丙酮配位的ZrO_2水合物，热处理后的ZrO_2纤维的相结构为亚稳四方相，纤维的直径为15μm左右，纤维中存在大量的纳米级气孔，但无明显裂纹。4。

A silicon carbide slurry as a casting abrasive material was prepared by sulphonated acetone-formaldehyde polymer as a dispersant.

由自制的磺化丙酮-甲醛缩聚物(sulphonated acetone-formaldehyde plymer，SAF)作为分散剂制备了浇注碳化硅砂轮水基浆料。

In the reaction, industrial chlorinating agent and brominating agent with low cost and easy acquisition are used as oxidants to oxidize the ethyl lactate into the ethyl pyruvate.

反应中使用了廉价易得的工业用氯化剂、溴化剂作为氧化剂，将乳酸乙酯氧化为丙酮酸乙酯。

Methods The derivation with dansyl chloride was followed by normal-phase chromatography with a mobile phase of acetone/chloroform (2:98) at a flow rate of 1 mL/min and with the detection wavelength set at 425nm.

唾液经纯化、丹酰氯衍生化后用苯提取，以Hypersil BDS CN为正相色谱柱，丙酮－氯仿(2：98)为流动相，流速1 mL/min进行测定，检测波长为425 nm。

Wedgeplug O-Seal plug valves with their positive, no-leak features are not only recommended as the best general purpose valves for handling hydrocarbons, vegetable oils, solvents, etc., but are ideal for such tough service as butane, propane, butadiene, acetone, ethyl alcohol, ammonia, anhydrous ammonia, benzene, vinyl chloride, dry chlorine, Dowtherm, ethane, ethylene, hydrogen chloride, napthalene, oxygen, hydrogen, phthalic anhydride, dry phosgene, phosphoric acid, potassium carbonate, styrene, molten sulphur, sulphur dichloride and related services within a temperature range from -300oF to + 450oF within pressure limits of the valves.

楔塞O形密封旋塞阀具有积极的、无泄漏特性，不但是最好的通用的阀门，用于处理碳化氢，植物油，溶剂等，还特别适用于严酷的应用环境，如丁烷，丙烷，丁二烯，丙酮，乙醇，氨，无水氨，苯，氯乙烯，干氯，道氏热载体，乙烷，乙烯，氯化氢，萘，氧，氢，邻苯二甲酸酐，干碳酰氯，磷酸，碳酸钾，苯乙烯，融化硫，二氯化硫，以及温度在-184oC至232oC之间，压力在阀门额定压力等级范围内的有关应用。

These starch acetates exhibited different solubility in water,acetone and DMAc,depending on the DS value.

不同取代度的酰化淀粉在水、丙酮和DMAc等溶剂中表现出不同的溶解性。

The product has green-yellow fluorescence at excitation wavelength of 355 nm and emission wavelength of 478 nm, and the fluorescence intensity could be enhanced in the presence of acetone.

三、流动注射在线氧化荧光法测定氯普噻吨的的研究利用在硫酸介质中二氧化铅可使无天然荧光的氯普噻吨氧化而转变为在最大激发波长和最大发射波长分别为393nm和452nm的强荧光物质，而且丙酮对该荧光体系有强烈增敏作用的现象，建立了以醋酸纤维素固定化的二氧化铅作为固相反应器的流动注射在线氧化荧光法测定氯普噻吨的新方法。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。