硫酸

Determination of total acidity, and calculation of free sulphur trioxide content of oleum.

发烟硫酸中游离三氧化硫成分的计算和总酸度的测定。

Sulfur trioxide in oleum was necessary for the reaction system.

对于甲烷液相部分氧化反应，发烟硫酸中游离的SO3是非常重要的影响因素。

Learn to calculate the concentration of sulphuric acid and oleum.

会对发烟硫酸浓度进行换算。

The paper discussed present processes of oleum production ,found the process using tube-shell evaporator is reliable.

国内外发烟硫酸生产方法很多，通过比较分析找出了管壳卧式蒸发器生产法是适合的生产工艺方案。

At present, although the iodine as a catalyst, oleum as the solvent liquid phase partial oxidation of methane research is not adequate, but the reaction has higher yield and the conversion rate of the industrialized good prospects to enlarge production.

目前，虽然以碘为催化剂、发烟硫酸为溶剂的甲烷液相部分氧化反应的研究尚不充分，但是该反应具有较高的转化率和收率，工业化放大生产的前景良好。

The alkylbenzene and alkylmethylbenzene are sulfonated by using 20% oleum as the sulfonating agent.

采用发烟硫酸对合成的系列烷基苯中间体进行磺化。

The development of novel catalysts is the key of the study. In some typical technologies developed up to now, [PtCl2] or HgSO4 is used as catalyst with oleum as solvent with higher conversion ratio and yield.

甲烷液相部分氧化反应制甲醇的研究中催化剂的开发是该研究的关键，迄今为止，已开发的该过程典型工艺是在发烟硫酸溶剂中，采用铂配合物[PtCl2]或HgSO4为催化剂进行的反应。

The mechanism of V2O5 catalytic cycle for methane partial oxidation in oleum was discussed and the macro-kinetic model was deduced.

甲烷在部分氧化反应中首先转化为硫酸甲酯，后者进一步水解得到甲醇。

It is a reliable and advanced technology to recover iron oxide from roasted sulfate residue with flotati - on method,and it is a new ore dressing process.

用浮选方法从硫酸烧渣中回收系列氧化铁红产品，技术先进可靠，是一种选矿新工艺。

An orthogonal experiment design on the basis of three factors and four levels was applied for studying the effect of formula fertilization on yield.

采用L16(43)正交法设计，研究氮磷钾不同配比对板蓝根产量的影响；采用苯酚-硫酸比色法对多糖含量进行测定。

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％。