查询词典 acid anhydride

Methods Salicylic acid and acetic anhydride were used as the raw materials, with concentrated sulfuric acid as the catalyst.

目的 建立乙酰水杨酸的快速合成方法。

The yields of peracetic acid is studied from two different preparation methods using hydrogen peroxide and acetic acid or acetic anhydride .

比较了用乙酸和乙酸酐分别与过氧化氢反应制备所得的过氧乙酸的浓度。

Acetylsalicylic acid has been synthesized using salicylic acid and acetic anhydride with microwave radiation catalyzed by aluminum chloride.

摘要以水杨酸和乙酸酐为原料，以无水三氯化铝作催化剂，微波辐射合成了乙酰水杨酸，并讨论了影响反应的因素。

The diamyl glutarate was synthesized by esterification of n- amyl alcohol and glutaric anhydride separated from dicarboxylic acid by catalysis of silicotungstic acid.

以正戊醇和从二羧酸中分离出的戊二酸酐为原料，以硅钨杂多酸为催化剂进行酯化反应，合成戊二酸二正戊酯。

The benzene (or 80% of the butene) and the excess air in a fluidized bed or fixed-bed reactor for oxidation reaction of maleic anhydride was absorbed into the cycle of acid maleic acid.

将苯（或80%的丁烯）与过量空气在流化床或固定床反应器中进行氧化反应生成顺丁烯二酸酐，被循环的酸液吸收成顺丁烯二酸。

The company is the biggest professional manufacturer about succinic acid series in China,the main product are succinic acid,succinic anhydride,ethyl succinyl chloride,the products are fine and advanced technicsis used manufacturing.

简介： 公司是国内最大的丁二酸系列产品的专业生产企业，重点产品：丁二酸、丁二酸酐、丁二酸单乙酯酰氯，产品质量上乘，多种工艺提供不同厂家的需要。

The anhydride groups and acid chloride groups are preferably derived from carboxylic acid groups or oxyacid groups of sulphur and phosphorus.

该酸酐团体和酰氯团体最好来自羧酸群体或含氧酸硫和磷集团。

Piperidinecarboxylic acid is used as the raw material and acetic acid as the acylating agent, followed by the addition of some acetic anhydride in the later stage to get an important organic intermediate n-acetylpiperidine-4 carboxylic acid in the yield of 92%. Toluene is used as the solvent instead of sulfinyl chloride in the acyl chlorination to produce n-acetylpiperidine-4-carbonyl chloride with the yield of 97%.

以4-哌啶甲酸为原料、醋酸为酰化剂，后期加入少量醋酸酐反应得到中间体N-乙酰基哌啶－4-甲酸，收率92%；在甲苯溶剂中进行酰氯化得目标产物N-乙酰基哌啶－4-甲酰氯，收率97%。

This year the company operating the various organic chemical raw materials, varieties are: methanol, ethanol, ethylene glycol, butanol, isobutanol, isopropanol, glacial acetic acid, vinyl acetate, B lipid, Ding acetic acid lipid, styrene, toluene, phthalic anhydride, xylene, acetone, butanone, cyclohexanone, DMF, sulphuric acid, methyl isobutyl ketone, glycol Dingmi, three toluene, 2 Xin fat, melamine.

本公司常年经营各种有机化工原料，品种有：甲醇、乙醇、乙二醇、正丁醇、异丁醇、异丙醇、冰醋酸、醋酸乙烯、醋酸乙脂、醋酸丁脂、苯乙烯、甲苯、苯酐、二甲苯、丙酮、丁酮、环己酮、DMF、硫酸、甲基异丁基酮、乙二醇丁醚、三甲苯、二辛脂、三聚氰胺。

Iminodiacetic acid and aspartic acid reacting with t-butyloxycarbonyl anhydride in the basic solvent system of 1,4-dioxane-water gave better yields than those from conventional t-BuOH/H 2O system method,while glutamic acid in both solvent systems of 1,4-dioxane-water and tetrahydrofuran-water also gave better yield.

其中Boc酐法反应条件温和，操作简便，试剂易得且经济，是实验室制备Boc保护的氨基酸的常用方法。常规Boc酐法多采用叔丁醇水和四氢呋喃水的溶剂体系。我们用常规Boc酐法制备Boc 亚氨基二乙酸时，多次重复，收率总是低于 5 0 %，对天冬氨酸和谷氨酸进行Boc化时也有类似情况。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。