查询词典 acetone

Results showed that the two models could give the accordant mapping of the acetone concentration distribution.

研究结果表明：两种方法对浓度的分布能够得到较为一致的结果。

Some by-products are benzene, acetone, xylene, formaldehyde, and acetaldehyde.

一些副产品都是苯、丙酮、二甲苯、甲醛和乙醛。

It was founded that the renaturation yield was improved in the presence of arginine, thiourea, acetone, acetamide and glycerol compared with no additives.

分析其作用机制异同点；并基于海藻糖和甜菜碱对保护蛋白质的作用，考察了海藻糖和甜菜碱在不同浓度盐酸胍和酶浓度条件下对溶菌酶辅助复性和复性动力学特性，分析了它们作用机理。

Objective: To predigest former disposal of sample, avoid the damage of eluent: acetonitrile and acetone to the human body, reduce the cost and improve stability of HPLC apparatus.

目的：简化样品的前处理，避免高效液相色谱淋洗液乙腈、丙酮溶液对人体的损害，降低成本、提高仪器稳定性。

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。

Results show that methanol, alcohol, isopropanol and acetone can effectively enhance the yield of potassium oxide.The yield of potassium oxide in different reaction system of ammonia-methanol, ammonia-alcohol, ammonia-isopropanol and ammonia-acetone are investigated respectively.

分别考察氨—甲醇、氨—乙醇、氨—异丙醇和氨—丙酮溶液体系在不同条件下的氧化钾收率，实验结果表明，氨—异丙醇溶液体系有利于改善工艺条件、提高氧化钾收率。

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 invention uses the industry byproduct in production of sulfonation-process phenol or the byproduct (Na2SO3 content is 60-85percent) in production of p-cresol and sodium hydrosulfite to produce the aliphatic high range water reducer and takes acetone, formaldehyde, industry byproduct, sulphite or sodium pyrosulfite as raw materials and then sulfonation and condensation reactions are carried out in aqueous medium, the reactant weight ratio is acetone: formaldehyde: sulphite plus industry byproduct: water is equal to 1:2.5-4.5:1.5-2.6:4.0-6.0, the mass concentration of the condensation compound obtained is 30-42 percent, and the viscosity thereof is 20-100m.

本发明利用磺化法苯酚生产中的工业副产品，或者对甲酚和保险粉生产过程中副产品(Na 2 SO 3 含量在60～85％)生产脂肪族高效减水剂，采用丙酮、甲醛、工业副产物、亚硫酸盐和或焦亚硫酸钠作为原材料，在水介质中进行磺化和缩合反应，反应物的质量比为丙酮∶甲醛∶亚硫酸盐副产品∶水＝1∶2.5～4.5∶1.5～2.6∶4.0～6.0，所得到的缩合物的质量浓度为30～42％，粘度为20～100m。

A method for making Bisphenol A with a purity of more than 99.7% by reacting phenol and acetone using an acid catalyst, separating a BPA-phenol adduct by crystallisation and removing phenol from the adduct, in which involves continuous suspension crystallisation with a total dwell time of more than 4 hours in at least 3 crystallisers, by cooling first to 50-70 C in two parallel crystallisers and then to 40-50 C in a third crystalliser connected in series with the first two.; A method for the production of Bisphenol A with a purity of more than 99.7%, by reacting phenol with acetone in presence of an acid catalyst, separating a BPA-phenol adduct from the product mixture by crystallisation, filtration and washing, and removing the phenol from the adduct, in which stage involves continuous suspension crystallisation in at least three crystallisers connected in such a way that the mixture is first cooled to 50-70 C in two crystallisers in parallel and then cooled to 40-50 C in a third crystalliser in series with the first two, the total residence time of the mixture over all crystallisers being more than 4 hours.

描述用于生产纯度大于99.7％的双酚例如，双酚A(BPA的方法，这种方法包含苯酚和丙酮在有酸性催化剂参与的情况下反应形成一个包含双酚的产物混合物；通过结晶、过滤和洗涤从该产物混合物中以双酚/苯酚复合物的形式除去至少一部分双酚以提供双酚A/苯酚复合物晶体；并且从双酚/苯酚复合物晶体中除去至少一部分的苯酚以提供纯度大于99.7％的双酚；其中结晶过程包括连续的混悬液结晶，并且是在至少三个结晶装置中进行的，装置的排列使得产物混合物首先在结晶过程的第一阶段在第一个结晶装置和并联的第二个结晶装置中被冷却到50至70℃的温度，随后在结晶过程的第二阶段在与第一和第二个结晶装置下游串联的第三个结晶装置中被冷却到40至50℃的温度，并且其中产物混合物在结晶过程中的总驻留时间在4小时以上。

The Pd-supported catalyst on MCM-22 synthesized by static method shows a higher acetone conversion than that prepared by dynamic method in one-step synthesis of methyl isobutyl ketone from acetone.

在丙酮一步法合成甲基异丁基酮反应中，静态条件下合成的MCM-22为载体的催化剂的丙酮转化率较高，这是由于该分子筛的酸量较高所致。

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。