查询词典 acetone

The extraction and stability of the pigments in Tussilago farfara L. were studied. The experimental results showed that the pigments could be solved in acetone. The stability of the pigments is good when pH is within 3~9; the oxidizing agents, reducing agents and common food additives have little influence on its stability; it is react too much with Fe(superscript 3+) ion, and Na(superscript +) ion showed a certain increment effect on the color; the heat performance of the pigments is good when under 60℃.

研究了款冬花色素的热稳定性、氧化还原稳定性和pH值稳定性，并对常用的几种食品添加剂对款冬花色素的稳定性进行了探讨，结果表明：款冬花色素易溶于丙酮，属于脂溶性色素；在pH＝3～9时，款冬花色素的稳定性较好；氧化还原剂及食品添加剂对其稳定性影响不大，Fe(上标 3+)金属离子对其影响显著，Na有增色作用；水浴温度在60℃以下色素的热稳定性较好。

HPMC can not dissolve in grain alcohol, aether and acetone without water in them and can dissolve into clear or slight feculent colloidal solution.

HPMC在无水乙醇、*、丙酮中几乎不溶，在冷水中溶解成澄清或微浑浊的胶体溶液。

The model solvents included ethanol,acetone,ethyl acetate and tetrachloromethane.And 1-hexyl-3-methylimidazolium bromide and 1-hexyl-3-methylimidazolium fluoroborate were used as the model RTIL.

结果表明，两种离子液体吸收乙醇或丙酮后，它们的电导率和介电常数显著增加，而四氯化碳对两种液体的电学阻抗特性影响较小。

Furyl 3 buten 2 one is synthesized from furfural and acetone in water sodium hydroxide medium.

以呋喃醛为原料，在水-氢氧化钠体系中合成了糠叉丙酮，探讨了丙酮用量，氢氧化钠浓度对反应的影

Using a simple and reliable apparatus,the solubilities of glutaric acid in water,ethanol,toluene,chloroform,n-butanol and acetone are determined by the analytic method.

用平衡法分别测定了戊二酸在水、乙醇、甲苯、氯仿、正丁醇、丙酮中的溶解度数据。

At the same time, for the alternatives, another set of devices was also set up according to balanced method. From above two experiments, we got solubility datas of succinic acid, glutaric acid and adipic acid in six solvents of water, ethanol, n-butanol,choloroform, acetone and toluene, of which most were measured for the first time.

由合成法和平衡法实验测定了丁二酸、戊二酸和己二酸三种溶质在水、乙醇、正丁醇、氯仿、丙酮、甲苯六种溶剂中的溶解度数据，其中大部分体系和溶解度数据是首次测定。

Protection for sleeve, marking and sealing materials on capacitor body will not be damaged, which shouldnever be washed or cleaned by halogenous agents or solvents such as trichloroethylene. Xylene or acetone etc.

为了保护塑胶套管，印刷标示以及封口材料不被破坏，电解电容器不得以卤化化学药品或类似溶剂作为电解电容器洗涤之用，如三氯乙烯、二甲苯类或酮类等。

Protection for sleeve, marking and sealing material on capacitor body not to be damaged, capacitor body not to be damaged, capacitors should never be washed or cleaned by halogenous agents or solvents such as trichloroethene, Xylene or acetone etc.

为了保护塑胶套管印刷标示以及封口材料不被破坏，电解电容器不得以卤化化学药品或类似溶衯作为电解电容器洗濯之用，如三氯乙烯。本公司一般规格之电解电容器其品质依照 JIS C-5141W 标准。

It may be concluded that the Fe_2O_3/MgO sites,localized on Mg atoms,are acidic(presumably Lewis-type) in nature and that these results provide evidence for the heterolytic decay of the hydroperoxide to phenol and acetone.It was found that the activity of the catalysts had relationship with their redox behaviour.

氧化催化剂的活性与其氧化还原性具有一定的相关性，催化剂还原性越好，越容易导致异丙苯过氧化氢分解，进而促进异丙苯的转化。

The reaction under the catalysis of 10%Fe_2O_3-MgO stoped quickly.It may be concluded that the Fe_2O_3/MgO sites,localized on Mg atoms,are acidic(presumably Lewis-type) in nature and that these results provide evidence for the heterolytic decay of the hydroperoxide to phenol and acetone.

采用共沉淀法制备了催化剂M_xO_y-MgO(M=Ni、Fe、Co、Cu)，并用X射线衍射仪、程序升温还原(H_2-TPR)以及X射线光电子能谱等对催化剂进行了表征，并与其催化性能进行了关联。

And Pharaoh spoke to Joseph, saying, Your father and your brothers have come to you.

47：5 法老对约瑟说，你父亲和你弟兄们到你这里来了。

Additionally, the approximate flattening of surface strip using lines linking midpoints on perpendicular lines between geodesic curves and the unconditional extreme value method are discussed.

提出了用测地线方程、曲面上两点间短程线来计算膜结构曲面测地线的方法，同时，采用测地线间垂线的中点连线和用无约束极值法进行空间条状曲面近似展开的分析。