查询词典 acetone

Ketimine, which is prepared by acetone and ethylene diamine or hexamethylene diamine was used as potential chain extender to improve the properties of aqueous polyurethane resin.

用丙酮分别和乙二胺、己二胺反应制备酮亚胺，并以其作为潜伏性扩链剂改善水性聚氨酯的性能。

Iodination of acetone ; absorbance ; software ; graphically show

丙酮碘化；吸光度；软件；图形显示

In order to investigate the effects of magnetic field on the liquid-liquid extraction,the extraction process of acetone-water-methyl isobutyl ketone system was studied under magnetic field with different magnetic induction intensities.

为探讨磁场对液-液萃取过程的影响，本研究在不同磁感应强度的磁场中，对丙酮-水-甲基异丁基酮物系的萃取过程进行了研究。

Ab initio and density functional theory (B3LYP) in G98 were employed to study the following four direct aldol reactions between acetone and isobutyraldehyde or 3,3-dimethylbutyric aldehyde or benzaldehyde or 4-bromo-phenyl aldehyde catalyzed by-proline .

中文摘要：本文采用G98程序包中的从头计算方法和密度泛函方法计算研究了-脯氨酸催化丙酮与异丁醛、3，3-二甲基丁醛、苯甲醛及对溴苯甲醛的不对称直接羟醛缩合反应，共计四个反应体系。

The liquid-phase condensation reaction kinetics of isophorone synthesis was investigated by using acetone as raw materials.

研究以丙酮为原料液相法合成异佛尔酮的液相缩合反应动力学。

Acetone; Synthesis; Isophorone; Mg-Al composite oxide; Characterization ; Activity evaluation

丙酮； 合成；异佛尔酮；镁铝复合氧化物；表征；活性评价

Mg-Al oxide catalysts were prepared by co-precipitation method, used ammonia as the precipitating agent. The catalytic performances of these materials were investigated in the gas-phase Aldol condensation of acetone to isophorone. The structure and surface properties of the catalysts were characterized by means of XRD, XPS, ICP, TG-DTA and TPD.

采用共沉淀法，以氨水为沉淀剂制备了一系列具有不同Mg/Al摩尔比的镁铝氧化物催化剂，考察了它们在丙酮气相缩合反应中的催化性能，并通过XRD，XPS，ICP，TG-DTA和TPD等手段对催化剂的结构和性质进行了表征。

Keywords isopropenyl acetate;acetyl acetone;vapor-liquid equilibrium

乙酸异丙烯酯；乙酰丙酮；汽液相平衡

This result is different from the usual reactions catalyzed by metallophthalocyanine and other macromolecule such as Schiff base metal chelate, where the ketonic component is acetone.

此一结果同通常酞菁或其它如西弗碱大分子金属络合物催化下生成丙酮和酚不同。

The colour of most detected bands became light in the five media with the order of mannosan, mannose, xylan, glucose and pectin.(4)The pectinase in the supernatant was purified by centrifuge , acetone precipitation and sephadex G-75 cloumngel filtration. The specific activity was increased 9.8-fold with an activity recovery of 32.98%.The molecular weight of pectinase was 42.2KD estimated by SDS-PAGE.

确立了以葡萄糖培养基6h的发酵液为提取果胶酶的最初取样点，发酵液经离心，丙酮沉淀，Sephadex G-75葡聚糖凝胶柱层析后获得了凝胶电泳均一的样品，比活力较原酶液提高了9.8倍，回收率达到了32.98%，用SDS-PAGE凝胶电泳测的纯化后的果胶酶分子量为42.2KD。

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。