丙酮

The factors which mostly affect the quality and output of the product including molar proportion of reagents, reaction temperature, alkaline concentration and reaction time are analyzed. After orthogonal experiment, it is concluded that the optimized reaction condition is that acetone and furfural are charged with equal molar quantities at 40 with sodium hydroxide (0.10 mol/L) and the operation time 5 h.

通过对影响亚糠基丙酮质量和收率的主要因素原料配比、反应温度、碱浓度、反应时间等单因素实验，探索出合成亚糠基丙酮的优化反应条件为：原料配比n：n=1.0：1.0、反应温度40℃、氢氧化钠溶液浓度为0.01 mol/L、反应时间5h。

Solubility of barium chloride and barium oxide in hydrochloric acid, ethanol,acetone,ether and hydrochloric acid- ethanol,hydrochloric acid- acetone,hydrochlo- ric acid- ether has beeen studied and the separation of Ba O from Ba Cl\- 2 with hydrochloric acidethanol as the solvent has been proposed.

研究了氯化钡和氧化钡在盐酸、乙醇、丙酮、乙醚及盐酸-乙醇、盐酸-丙酮、盐酸-乙醚中的溶解性，提出以盐酸-乙醇为溶剂进行两者的分离。以 DBC- CPA为显色剂分光光度法测定氧化钡的含量，加料回收率为 98%～ 10 2 %，氧化钡含量为 0 。32 %时，平行测定 7次，相对标准偏差为 1。 58%。该法适于快速测定热处理盐浴中氧化钡的含量，对监控盐浴品质有指导意义

A new convenient synthesis of a series of 1-aryl-2-propanones using aromatic amine s as precursors, via diazo reaction and improved Meerwein arylation reaction under mild conditions, was achieved.

以芳香胺为原料，经重氮化和改进的Meerwein芳基取代反应，合成了一系列的1-芳基-2-丙酮，其中1-(3，5-二三氟甲基苯基)-2-丙酮是一个新化合物。

Finally it generates CH_3COOH, which desorbs from the surface of sensing material at 350℃.(3)LaNi_(0.5)Ti_(0.5)O_3 thin film was prepared by the RF-magnetron sputtering method and heated at 700℃for 3h.

其丙酮气体敏感性能主要来源于以下过程：丙酮气体分子与吸附氧之间发生反应形成中间体{acetone-oxygen}，中间体随即发生分解和氧化，并最终生成CH_3COOH，在350℃下CH_3COOH从敏感材料表面脱附。

The herbicides in the sample was extracted with ethyl acetate. The extract was decanted into a flask through a filter paper, then the filtered solution was concentrated to dry. The dry sample was dissolved and added to 5 mL with acetone-n-hexane (30:70, V/V). It was cleaned up by Florisil, concentrated again. The sample was dissolved and adjusted to 1mL with acetone.

匀浆后的草莓试样用乙酸乙酯进行提取，提取液经滤纸过滤后收集，再浓缩蒸干，用丙酮：正己烷(30：70， V/V)溶液溶解至5ml，经Florisil固相萃取柱净化，吹干后用丙酮定容，供气相色谱－质谱联用仪进行测定。

Methods The ionization constant was determined with acid-basle titration in acetone/water solutions with different ratios, the pH at half neutralization point was regarded as pKa, the value to infinite diluted in pure water was explored and the lgP was determined with bottle-shaking method by HPLC.

方法采用酸碱滴定法测定各不同体积比的丙酮-水溶液中药物半中和点时的pH值作为药物在该体积比的丙酮-水溶液中的pKa值，再外推至纯水中药物浓度无限稀释时的pKa值；采用HPLC配合摇瓶法测定药物的分配系数。

The results showed 3 types of aluminum compound prepared in this paper all had good poison protection effectiveness on such impurities as stannous chloride,lead oxide,sodium hydrogen sulfate,and so on.Moreover,the mechanism of the poison of catalyst was also discussed.

结果表明，合成的3种防中毒剂即防－1、防－2(主要成分为乙酰丙酮合铝)及防－3(主要成分为二乙酰丙酮基异丙氧基铝)对二月桂酸二丁基锡、氯化亚锡、二正丁胺、硫脲、氧化铅及硫酸氢钠等杂质均有较好的防中毒作用；不同防中毒剂对不同杂质的防中毒作用有一定的选择性。

By the determination of different additives influence on the crystal rules of the potassium nitrate, the primary selection to methanol, alcohol, acetone and ammonia is carried out. The results show that the methanol and ammonia have the best separation effect.

通过测定不同浓度下甲醇、乙醇、丙酮、氨四种添加剂对硝酸钾结晶的影响规律，发现甲醇和氨对硝酸钾的析出效果最好，乙醇次之，丙酮最差。

The acetone precipitation group: bile sample was washed with 4 times volume of precooled acetone, dried by vacuum freeze dryer and dissolved with lysis buffer.

在胆汁标本中加入4倍体积的预冷丙酮，用预冷的丙酮洗涤沉淀，然后用真空冻干机抽干，用裂解液溶解沉淀过夜。

The trichloracetic acid/acetone precipitation group: 4 times volume of mixture of trichloracetic acid/acetone was added in the bile sample, washed with 4 times volume of precooled acetone, dried by vacuum freeze dryer and dissolved with lysis buffer.

在胆汁标本中加入4倍体积的预冷三氯乙酸/丙酮混合液，用预冷的丙酮洗涤沉淀，然后用真空冻干机抽干，用裂解液溶解沉淀过夜。

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。