乙酸的

Naphthalene was used as internal standard substance in the analysis method. ResultsThe standard curve of bornyl acetate was linear over the range of 0.109 6～1.753 6 μg,r=0.999 6.The mean recovery of bornyl acetate was 101.33％,RSD=1.79%.

结果在该色谱条件下，乙酸龙脑酯在进样量0.109 6～1.753 6 μg范围内呈良好线性关系，r=0.999 6；乙酸龙脑酯的加样回收率为101.33％，RSD=1.79%。

Our main products include 5-Methyl-2-pyrazinecarboxylic acid series, Guanine series, Folic acid series, Methyl Cyanoacetate and Ethyl cyanoacetate series, we also have made great contribution in the development of cardiovascular drug, stomach drug, anti-inflammatory drug and antidepressants, such as Nizatidine, Acipimox, Glipizide, Zaltoprofen and Pregabalin, which have been put into production on large scare.

公司主要产品有5-甲基吡嗪-2-羧酸系列，鸟嘌呤系列，叶酸，氰乙酸甲酯，氰乙酸乙酯系列，在心血管药、胃药、消炎药、抗抑郁药等新品开发上有重大建树，先后研制成功，形成批量生产，如尼扎替丁、阿西莫斯、格列吡嗪、扎托洛芬、普瑞巴林，同时具备为客户定制化学品的能力。

The catalytic activity of iodine in the esterification reaction was studied by synthesis cyclohexyl acetate from acetic anhydride,cyclohexano and acetic acid,cyclohexano.

以单质碘为催化剂，通过乙酸酐、环己醇及乙酸、环己醇为原料合成乙酸环己酯，对碘的催化活性进行了研究。

This paper introduced a new preparative method of sodium diacetate within one step and the mate technique of SSDA .

本文采用一步法合成双乙酸钠，介绍了增效双乙酸钠的复配工艺，同时测试其防霉效果。

A new technology process of sodium diacetate production with glacial acetic acid and sodium carbonate in one reactor.

研究了以冰醋酸和碳酸钠一步合成双乙酸钠的工艺和反应设备，使双乙酸钠生产工艺更为简单合理，经济易行，而且产率达 97%以

Sodium Diacetate and Sodium Dehydroacetate are two new-model preservatives.

双乙酸钠和脱氢乙酸钠为两种新型的防腐防霉剂。

In order to investigate the mechanism for this reac-tion, methyl α-bromoacetate or ethyl α-bromoacetate as starting material was added to the solution of phenyl selenoamide in ethanol in 1∶1 or 2∶1 molar ratio under the neutral condition at room temperature. The results indicated that the same product bis or bis diselenide was formed. Byproduct ethyl benzoate was also separated.

为了研究该反应机理，选择α-溴代乙酸甲酯或α-溴代乙酸乙酯在无催化剂、中性条件下，乙醇溶液中与苯基硒代酰胺室温下反应，投料比为1∶1和2∶1，结果也都生成了同一类产物二甲氧羰基甲基二硒醚或二乙氧羰基甲基二硒醚，同时还分离得到了相应的副产物苯甲酸乙酯。

In order to investigate the mechanism for this reaction, methyl α-bromoacetate or ethyl α-bromoacetate as starting material was added to the solution of phenyl selenoamide in ethanol in 1:1 or 2:1 molar ratio under the neutral condition at room temperature. The results indicated that the same product bis or bis diselenide was formed. Byproduct ethyl benzoate was also separated.

为了研究该反应机理，选择α-溴代乙酸甲酯或α-溴代乙酸乙酯在无催化剂、中性条件下，乙醇溶液中与苯基硒代酰胺室温下反应，投料比为1：1和2：1，结果也都生成了同一类产物二甲氧羰基甲基二硒醚或二乙氧羰基甲基二硒醚，同时还分离得到了相应的副产物苯甲酸乙酯。

It showed that the yield of hydroxyacetic acid reached above 99.5%, the extracting efficiency was over 97%,and the product with purity of more than 96% was obtained. Extractant and solvent also can be reused.

实验结果表明：羟基乙酸合成的反应产率达99.5%以上，羟基乙酸萃取率达97%以上，最终收率达96%，萃取剂与溶剂均可循环使用。

The optimum reaction conditions of the synthesis of isoamyl acetate with Nafion NR50 resin membrane as catalyst were studied.

以全氟磺酸树脂膜为催化剂得到冰乙酸和异戊醇反应合成乙酸异戊酣适宜的反应条件。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。