查询词典 acetic

The distillation of acetic acid,water and butyl acetate system was a gas-liquid-liquid three phase azeotropic distillation process.

醋酸/水体系相对挥发度不大，是典型的非理想体系，醋酸不仅在液相具有强的

A series of 2-acetylformanilides were prepared,followed by thiolation with Lowesson reagent to afford 2-acetylthioformanilides,which further reacted with Mn3·2H2O in glacial acetic acid under microwave irradiation to afford 2-acetyl benzothiazole s.

合成了一系列的硫代酰胺，研究了它们在微波辐射醋酸锰作用下发生氧化自由基环化反应，成功地合成了一系列2-乙酰基苯并噻唑衍生物，其结构经红外光谱、核磁共振谱和质谱得到了证实

The acetate bicyclic guanidine has the above structure and is synthesized by a direct reaction of bicyclic guanidine and acetic acid in a catalyst-free aqueous solution.

所述的醋酸双环胍具有如上结构，是由双环胍与醋酸在无催化剂、水溶剂中直接反应合成。

In our study, polyimide hybrid films containing bimetalic compounds were prepared by codoping poly with a bariumand titanium precursor prepared from Ba(CH_3COO)_2, Ti_4, and acetic acid followed by casting and thermal curing.

陶瓷粉BTL是由Ba(CH_3COO)_2，Ti_4和乙酸制成的钡钛前驱物，采用溶胶凝胶法合成，并由红外光谱和X-射线衍射图证明，在650℃BTL完全转化为BaTiO_3晶体。 3。通过两步法合成含陶瓷粉的聚酰亚胺复合材料。

The liquid-liquid equilibrium binodal curves and the tie-line data of an epoxy cotton seed oil/acetic acid/water ternary system.

测定了环氧棉籽油－醋酸－水三元系分别在30℃，40℃，50℃，60℃下的液－液平衡双结点曲线，以及在40℃，50℃，60℃下的液－液平衡系线数据；分别应用物料衡算法和系线中点轨迹法对实验数据进行了检验。

On the condition of using fatty acids of rapeseed oil as raw material,85% acetic acid as solvent, pelargonic acid as recrystalization solvent, this paper prepared azelaic acid and brassylic acid by ozonolysis ,oxidation decomposition ,recrystallization etc.

以蓖麻油酸为原料、85%醋酸水溶液为溶剂，经臭氧化、氧化分解、沸水萃取等过程制备壬二酸的最佳反应条件为：m：m(85%醋酸)=1：4，臭氧化温度20-25℃；氧化分解温度90-95℃，催化剂醋酸锰/醋酸铜用量为原料蓖麻油酸质量的0.09%，氧化分解4h，壬二酸的收率为62.5%。

In the test 5 treatments of single-sowed alfalfa or smooth brome grass, and their mix-sowing with different ratios of 50%+50%, 60%+40% and 70%+30% were set up to analyze pH, CP, NDF, ADF, acetic acid, butyric acid, lactic acid and total acid of the silage in each treatment and study the effect of alfalfa and smooth brome grass with different mix- sowing ratio on silage quality.

方法］试验设5个处理，即紫花苜蓿单播、无芒雀麦单播、紫花苜蓿＋无芒雀麦以50%+50%、60%+40%和70%+30%比例混播，分析各处理青贮材料的pH值、CP、NDF、ADF、乙酸、丁酸、乳酸和总酸的变化，研究无芒雀麦与紫花苜蓿不同比例混播对青贮品质的影响。

Bromothiophene was synthesize d from thiophene through bromination to give 2,3,5-tribromothiophene,then reduced by Zinc in acetic acid.

以噻吩为原料，先和溴素反应合成2，3，5-三溴噻吩，再以锌作还原剂在乙酸溶剂中反应得到3-溴噻吩，主要研究了第一步反应时的原料配比对反应的影响及第二步的反应时间对反应的影响，反应总收率达72.6%。

Bromo-2′,4′-dichloroacetophenone was synthesized in three steps,w hich were bromization ,chlorination and acylation,from glacial acetic acid and m -dichlorobenzene.

以冰乙酸和间二氯苯为原料，经溴化、氯化、酰化三个步骤，制得 2—溴- 2′，4′-二氯苯乙酮，产率达 70 %。

Pyruvaldehyde was synthesized with acetone or 1,2 propanediol as starting material respectively.With n∶n=1 00∶0 79,3 0-4 0 g potassium chlorate as catalyst,and water and glacial acetic acid as solvent,refluxing on water bath of 60-75 ℃ for 4 h,bromoacetone was obtained in 63 5% yield.

分别用丙酮和 1，2 丙二醇做原料合成了丙酮醛。n∶n =1 0 0∶0 79，加入 3 0～4 0g氯酸钾做催化剂，水和冰醋酸做溶剂，水浴温度为 6 0～ 75℃，回流 4h ，制得产率为 6 3 5 %的溴丙酮。V∶V =11 9∶1 0 ，通入空气，在 6 5～ 70℃反应 5～ 8h ，制得产率为 5 9 6 %的丙酮醛。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。