查询词典 sulfuric

Through the analysis of szaibelyite ,the manufacture method of boric acid and magnesium carbonate from szaibelyite by sulfuric acid,CO_2 and ammonia water is determined.

对硼镁矿成分进行分析，从而确定了采用硼镁矿制取硼酸联产碳酸镁工艺路线———用硫酸分解硼镁矿制取硼酸，硼酸母液经处理后加入碳化氨水制取碳酸镁。

Tetradecyl acrylate was synthesized by direct-etherification from tetradecyl alcohol and acrylic acid with p-methyl benzene sulfuric acid as catalyst.

摘 要：以丙烯酸和十四醇为原料，经酯化反应直接合成丙烯酸十四酯。

The conversion of product reaches 98% under the optimal experiment condition: the molar rate of acrylic acid and tetradecyl alcohol is 1.1; the amount of p-methyl benzene sulfuric acid is 0.8%; the amount of p-benzened...

得出合成丙烯酸十四酯的最佳合成条件：丙烯酸与十四醇摩尔比为1 1，对甲苯磺酸用量为0 8%，对苯二酚用量为0 6%，反应温度为120℃，反应时间为4h。

The ore sample tested was the tail of Pan-Zhi-Huan vanadic titanomagnetite after magneticseparation and froth flotation of the sulfides,with particle size minus 0.315mm and TiO_2 content 17.5-18%. A high-grade concentrate of 47.7% TiO_2 with a 67% recovery was abtained in a open circuit flotation (one roughing and two cleaning operation), using solely sulfuric acid as pH regulator.

对浮选攀枝花钒钛磁铁矿的磁选—浮硫化物后的尾矿—即试料(粒度为—0.315毫米、含TiO_2为17.5—18%)，除用硫酸调整pH外，在不需添加其他调整剂的情况下，经一次粗选二次精选就可获得含TiO_247.7%、收率为67%的高品位钛精矿。

With the starting material intermediate titanyl sulfate and meta-titanic acid of titanium white product by sulfuric acid process,the titanium dioxide and iron content have been determined.

以硫酸法钛白粉生产工艺中间体浓钛液和偏钛酸为原料，分析了浓钛液中二氧化钛和铁的含量。

This paper described the preparation of nanometer TiO_2 by means of direct precipitation and homogeneous precipitation with titanyl sulfate,which is a semifinished product during the production of TiO_2 using sulfuric method as raw material.

我国二氧化钛(TiO2，俗称钛白)工业自1956年生产搪瓷和电焊条开始，距今已有近50年的发展历史。近10来，我国TiO2工业发展很快，取得了令人瞩目的成就，其中硫酸法TiO2的生产与国外先进技术相差无异，总生产能力已跃居世界第二位，仅次于美国[1]。

The bromine value of petroleum products was determined by potential titration in mixed solvents of glacial acetic acid,trichloromethane,methanoland sulfuric acid,this method was compared with indicator titration,the experimental results show the method relative standard deviation is smaller.

以冰醋酸、三氯甲烷、甲醇和1：5的硫酸(体积比为714：134：134：18)作为滴定溶剂，采用电位滴定法测定石油产品的溴值，并与指示剂滴定法进行对比。

As to the high polarity, high boiling point resultant—trimesic acid, the analysis methods of infrared spetrum, gas chromatography-mass spectroscopy, vapour-phase chromatography, acid number titration and so on are seperately used to characterize its property. Infrared spetrum and gas chromatography-mass spectroscopy are used to have a qualitative analysis on the resultant and are compared with the stand diagram. Sulfuric acid-methanol esterification and rapid esterification are used to prepare the trimesic acid trimethyl-ester and have a FID quantitative analysis. So that we make sure the purity of trimesic acid in the resultant and also we have an acid alkali titration on the resultant to get its acid number, in order to verify the purity of trimesic acid in the resultant.

对于高极性、高沸点的固体产物均苯三甲酸，分别采用红外光谱、气质联用、气相色谱、酸值滴定等分析手段进行了表征：利用红外光谱、气质联用的方法进行产物的定性分析，并与在同一仪器、同一条件下做出的标准谱图进行比对；采用硫酸-甲醇酯化法和快速酯化法制备出均苯三甲酸三甲酯，对其进行气相色谱FID定量分析，进而确定固体产物中均苯三甲酸的纯度；用酸碱滴定法确定固体产物的酸值，以对固体产物中均苯三甲酸的纯度进行验证。

As catalyst, the tungstosilicic and phosphato-tungstic acids have similar catalytic activities which are six times more than that of sulfuric acid in the same reactive conditions.

钨硅酸和磷钨酸具有相似的活性活性，在同样条件下，其速度常数均为硫酸的六倍，其选择性为硫酸的3倍。

Vanadic oxide, nitric acid and sulfuric acid were used to decompose soil and plant samples in 80℃ water bath, and then the mercury concentration was determined by FI-HG-CAAS.

然后采用五氧化二钒-硝酸-硫酸体系，在80℃水浴中消解土壤、植物样品，再用流动注射-氢化物发生石英管冷原子吸收系统测定样液中的汞。

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％。