丙酮的

At the end of the 1990s, there is breakthrough progress in the phenol-acetone process of the world. Especially development of molecule sieve catalyst for cumene is not only of progress of the technique ,but also possibility of clean-production, Also, sythesization and purification of phenol-acetone have been get improvement largely.

九十年代末，世界苯酚丙酮生产技术有了突破性的进展，尤其是分子筛催化剂合成异丙苯技术的开发，不仅是技术的飞跃，而且实现了清洁生产；加之苯酚丙酮合成与精制技术也在不断改进，使装置产品产率和质量进一步提高，物耗能耗大幅度下降。

Then, the specific activities of protease and amylase were relatively lower than pancreatin separating with acetone, but the specific activity of lipase was higher. The ratio of activities in filtrate were very low, showing the precipitation was effective.

其中蛋白酶和淀粉酶的活力较低，与丙酮胰酶(3159U/g和58.7kU/g)相比有较大的差距，但是脂肪酶活力较高，高于丙酮胰酶的50.10kU/g。

The optimum process starting from 1,3-dihydroxyacetone and formamidine acetate was: 22.54g(0.25mol) 1,3-dihydroxyacetone, 29.12g(0.28mol) formamidine acetate and 120ml isopropanol in liquid ammonia was heated to 40℃ for 8h.

以1，3-二羟基丙酮和醋酸甲脒为原料的较佳工艺：1，3-二羟基丙酮22.54g (0.25mol)，醋酸甲脒29.12g (0.28mol)，异丙醇120ml，通入液氨，40℃反应8h，减压蒸馏除去反应液中的氨气后过滤，滤液加至热的苦味酸饱和溶液，自然冷却至室温，制得4(5)-羟甲基咪唑苦味酸盐69.5g，收率85.0%。

In order to supply basic thermodynamic data for the separation design of acetyl acetone from the isomerization reaction of isopropenyl acetate,vapor-liquid equilibrium data of isopropenyl acetate-acetyl acetone system under 101.3 kPa was measured using Ellis equilibrium still.

为了给乙酸异丙烯酯异构化生产乙酰丙酮工艺的产物分离设计提供基础热力学数据，用埃利斯平衡蒸馏器测定了101.3 kPa下乙酸异丙烯酯-乙酰丙酮体系的汽液平衡数据，结果表明，该二元体系未形成共沸物，实验数据通过了Herrington面积法的热力学一致性检验。

In order to study the aldol condensation of 2,15-hexadecanedione on the surface of aluminium, the intermolecular condensationmechanism of acetone occurring on aluminum was simulated by usingsemi-empirical AM1 method embodied in MOPAC 6.0 program package.

为了研究2，15-十六烷二酮在氧化铝表面的环合机理，选择小分子丙酮为模型化合物，用量子化学半经验AM1方法研究双分子丙酮在氧化铝表面的醛醇缩合机理。

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。

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。

Extracting oat oil with aceton,petrobenzine,ethano-aceton and n-hexne from oat,determining quality of physical and chemic about acidity value ,iodic value,saponification value,unsaponification,colour and melting point,analysis on composition of fatty acid on oat oil.

分别以乙醚、丙酮、丙酮-乙醇、正己烷对燕麦进行萃取，对所得油脂进行酸价、碘价、皂化值、不皂化物、色泽、熔点等理化性质的测定，同时对燕麦油的脂肪酸组成进行分析。

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。