查询词典 sulfuric

Results The optimal conditions of discomposing Rhizoma Typhonii polysaccharide with sulfuric acid were 10% sulfuric acid, 100 ℃ for 2 h under the normal condition,and the yield of low-molecular-weight polysaccharide was 36.17%.

结果 常态条件下的硫酸降解，在酸浓度为10%、100 ℃下反应2 h最佳，此时低分子量多糖含量约为36.17%。

Based on this result, a new technology is suggested, that is by regulating the effective sulphonating contents of 1-amino-anthraquinone, adjusting the concentration of sulfuric acid to hydrolyze 1-amino-anthraquinone disulfonic acid conversing to 1-amino-anthraquinone -2-sulfonic acid, and briminating the hydrolyzed product in 100% sulfuric acid, 87% yield of Bromamino-acid was achieved, 10% higher than the conventional method prepared by "oleum method".

此新工艺，溴氨酸在产物中含量可达87％，比常规的发烟硫酸法生产溴氨酸提高了10％，质量和收率都接近或达到溶剂法生产的水平。 1，5-二硝基蒽醌和1，8-二硝基蒽醌是生产分散蓝56、分散蓝73等一系列分散染料重要中间体。

Therefore can pass to use the cupric sulfate sulfuric acid potassium for the catalyst take sulfuric acid as to carry the body to digest it, make the amino acids chelate match the conversion for dissolve sex easily of ammonium sulfate and white vitriol, then absorb a fixed amount to try the kind to join 40% sodium hydroside combine under the steam heat function make ammonia the spirit swims to leave out, through cool off to respond the born boric acid with boric acid, be got the total nitrogen content by the standard aqua titration of hydrochloric acid immediately after;But the white vitriol can immediately join the hydrochloric acid hydroxylate , fluoride to turn the in order to cover up, carry on the titration but get the content of its zinc with the EDTA mark liquid..

因此可以通过用硫酸铜硫酸钾为催化剂以硫酸为载体将其消化，使氨基酸螯合锌转化为易溶性的硫酸铵和硫酸锌，然后吸取一定量的试样加入40 %的氢氧化钠并在水蒸气高温作用下使氨气游离出来，经冷却与硼酸反应生成硼酸铵，接着由盐酸标准溶液滴定得到总氮含量；而硫酸锌即可加入盐酸羟铵、氟化氢铵为掩蔽剂，用EDTA标液进行滴定而得到其锌的含量。

In this article, anthrone-sulfuric method and phenol-sulfuric method were used to test quantificationally Medicago sativa polysaccharides content, and made sure which one is the better method.

采用蒽酮－硫酸法和苯酚－硫酸法测定了苜蓿芽多糖含量，并比较了2种方法的适用性。

As for acetalation, we research the effects of acid kinds, acid quantity, temperature solvents on it and get the conclusions that the optimized acid is sulfuric acid, the optimized temperature is 65 °C, the reaction time is five hours, and the material ratio of sulfuric acid to methylglyoxal to methanol is 0.028:1:6.837.

在醛保护一步中，研究了酸种类、酸用量、温度及其溶剂的影响，得到了本反应的较好条件是：酸为浓硫酸，反应温度为65℃，反应时间为5小时，浓硫酸：丙酮醛：甲醇的配比为0.028：1：6.837，反应收率可达81%。

In order to solve these problems, first, activated carbon which was deashed by hydrochloride was modified through using concentrated sulfuric acid, concentrated nitric acid, hydrogen peroxide and potassium permanganate in the paper, the result showed that the modification of activated carbon is best through using concentrated sulfuric acid under 250℃ through analyzing the desulfurization efficiency and acidic oxygenous group on surface.

对上述问题，本文首先采用浓硫酸、浓硝酸、双氧水和高锰酸钾等氧化剂对盐酸脱灰后的活性炭进行化学改性，通过对改性活性炭的脱硫效果及其表面酸性含氧基团分析，得出在250℃的温度下采用浓硫酸改性活性炭效果最好。

DHCC Constance in the chemistry belongs to the onlighted Cyclopentanoperhydrophenanthrene when it reacted together with the acid Constance it could transform into the fluorescence phenol.we did the flouric determination for the DHCC, in which treated by the ethanol-sulfuric acid or acetic anhydride-methylene chloride-sulfuric acid, acquired standard curve in the 0-40μg/ml presented the liner relet...

DHCC类物质在化学上属于不发光的环戎烷多氢菲类，但与酸性物质一起反应时，可转化为产生荧光的酚类。用乙醇硫—酸或乙酸酐—二氯甲烷—硫酸处理后的DHCC进行荧光检测，获得标准曲线0—40μg/ml范围内呈线性关系，检出的最高灵敏度可达300ng/ml。该方法可用于分离后的DHCC及单一种DHCC代谢物的定性及定量分析。

The corrosion of concentrated sulfuric acid is related to the temperature and the impurity content. The corrosion rate is raised up when the temperature is higher. If the sulfuric acid has some ion nitrated , the pipe corrosion will raise up, too. The product's color is unusual.

浓硫酸管线的腐蚀还与温度及其杂质含量有关，温度的升高，腐蚀速率明显上升；而产品硫酸中含有的硝酸根离子则加剧了硫酸管线的腐蚀，且导致产品硫酸颜色异常。

In the orthogonal designable experiment ,the analysis results of zirconium source, precipitation , the sulfating agent is 1.54%, 2.27%, 5.11%,respectively. This result show that the influence of sulfating agent to the catalytic activity is the biggest. Under the same density of the sulfuric acid soaks, the effect of sulfuric acid is well compared to ammonium sulfate .The second is the precipitation, but the influence of the zirconia source is the smallest.

正交设计实验中锆源、沉淀剂、硫酸化试剂的极差分析结果分别为1.54%，2.27%，5.11%，此结果说明硫酸化试剂对催化剂的影响最大，其次是沉淀剂，锆源的影响最小，同时表明以Zr(NO3)4·5H2O为锆源、乙胺为沉淀剂、硫酸为硫酸化试剂是催化剂的最佳制备方案。

The Company main products are sinter cooler waste heat boiler, waste heat boiler blown cement kiln waste heat boiler, glass furnace waste heat boiler, gas turbine waste heat boiler, waste heat boiler pyrite-based sulfuric acid, sulfur-burning sulfuric acid and other waste heat boiler boiler products.

公司主导产品有烧结冷却机余热锅炉、吹风气余热锅炉、水泥窑余热锅炉、玻璃窑余热锅炉、燃气轮机余热锅炉、硫铁矿制酸余热锅炉、硫磺制酸余热锅炉等各种锅炉产品。

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％。