查询词典 sulfuric

PK values of 3-ethoxy-N-desmethyldiazepam (3-EtO-NDZ) in ethanol and acetonitrile containing various concentrations of sulfuric acid, determined by spectrophotometry and spectropolarimetry, were found to be 3.4 and 0.63 respectively. Temperature dependent racemization of enantiomeric 3-EtO-NDZ in ethanol containing various acid concentrations was studied by monitoring changes of ellipticity at 365 nm as a function of time on a spectropolarimeter.

3-乙氧基－N去甲基安定（3-EtO-NDZ；diazepam=安定）在含不同硫酸浓度的乙醇和乙腈中的pK值用光谱法和旋光光谱法作了测定，其结果分别为3.4和0.63.3-EtO-NDZ之对映异构体在含各种不同酸浓度的乙醇中与温度相关的消旋过程，用旋光光谱仪选择其圆二色谱在365nm波长处强度的改变为时间函数的方法作了测定。

The product was made from ritric acid and isoamyl alcohol with sulfuric acid as catalyst, and urea as stabilizator in the reaction.

以异戊醇和50％HNO3为原料，50％H2SO4为催化剂，尿素为反应稳定剂，合成了柴油十六烷值改进剂——硝酸异戊酯。

Bacterial and chemical oxidation of gold-bearing pyrite gives rise to not only ferric sulfate and sulfuric acid but also ferrous sulphate and low-valence oxide of sulfur. The potential in the system is too low to dissolve native gold to form Au(SO4)2- Experiments indicate that gold does not dissolve in sulfatic iron solution.

含金黄铁矿在细菌氧化、化学氧化过程中，除生成高铁的硫酸盐和硫酸外，还生成了亚铁的硫酸盐及硫的低价氧化物，体系中的电位较低，距溶解自然金呈Au(SO_4)_2~-所需电位甚远，实验表明，金不溶于硫酸铁溶液中。

The present invention uses industrial polystyrene as raw material, under the protection of inert gas uses complex of acidylating agent and concentrated sulfuric acid as sulfonating agent to make sulfonation, and utilizes dector-blade casting process or other membrane-forming process to prepare polystyrene sulfoacid membrane with low sulfonation degree.

本发明涉及电化学的燃料电池技术，更具体是指低温直接甲醇燃料电池用聚苯乙烯磺酸膜及其制备方法。本发明是以工业级的聚苯乙烯为原料，在惰性气体保护下以酰化剂与浓硫酸的络合物作磺化剂，进行磺化，并通过流延法或者其它成膜方法制备低磺化度的聚苯乙烯磺酸膜。

ABSTRACT: Under V-Mo co- existed condition at about 016 mol/L acidityof sulfuric acid , using copper as catalyst and sulfocarbamide as

一〔1～4〕，但其通常采用2～3 mol/L 的显色酸度，显色液中钒量大于116 mg 时将严重干扰钼的测定。

In this paper, the emulsifier sodium polyether sulfovinate modified polysiloxane was synthesized by sulfuric acid esterification between chlorosulfonic acid and polyether modified polysiloxane, then alkali neutralization. It was a kind of nonionic and anionic composite emulsifier.

本论文以聚醚改性聚硅氧烷为原料，进行硫酸酯化反应，并进一步用碱中和，合成了聚醚改性聚硅氧烷硫酸酯钠乳化剂，该乳化剂属于非离子、阴离子复合型乳化剂。

A novel naphthenic petroleum sulphonate was prepared in laboratory with the naphthenic oil and fuming sulfuric acid.

在实验室用发烟浓硫酸对环烷基油进行磺化反应，合成了一种新型的三次采油用表面活性剂：环烷基石油磺酸盐。

A novel sulphonate oil-displacement surfactant was made in laboratory using ester and fuming sulfuric acid and by hydrolysis and neutralization technologies.

摘要用发烟浓硫酸对油酯进行磺化，水解、中和后制成了磺酸盐驱油剂。

In order to minimize the pollution of the environment with waste acids and/or waste acidic salt solution, following measures were taken:(1) Instead of using excess sulfuric acid, sulfonation reaction was carried out in the presence of excess toluene and the water produced during the sulphonation was removed by azeotropic distillation.

在CLT酸生产中，为了使废酸和酸性废盐水对环境的污染减少到最低程度，采取了如下的措施：(1)与使用过量硫酸相反，磺化反应是在过量甲苯的存在下进行，同时用共沸蒸馏方法移出了磺化过程中产生的水。

The recent processes in the domestic sulphonation units are introduced which concern heat energy recovery, utilizing SO3 from sulfuric acid unit and replacing ESP with fiber precipitator.

介绍了近年来国内磺化装置在热能回收、采用硫酸装置吸收SO_3气体、用布林克多芯纤维除雾器取代静电除雾器处理磺化尾气诸方面所作的努力和工艺流程，对建设资源节约、环境友好型的新装置及老装置改造有借鉴作用。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。