查询词典 sulfuric

Benzyl bromide was synthesized from potassium bromide ,a by-product from synthesis of 2-hydroxy-4-n-octyloxybenzophenone(UV-531),and benzoic alcohol in the presence of concentrated sulfuric acid.

溴化钾作为工业生产2-羟基-4-正辛氧基二苯甲酮的副产品，在浓硫酸存在的条件下，与苯甲醇进行反应合成苄基溴。

Ultrasound is found to have significant effects on the oxidation of anthracene to anthraquinone by potassium dichromate in sulfuric acid solution.

温度分别为30℃、40℃和50℃时，在超声作用下，反应4 h后蒽的转化率分别为51.4 %、55.3 %和59.3 %；无超声作用下，蒽的转化率则分别为3.4 %、6.9 %和9.5 %。

The effects of the amount of sulfuric acid solution,the amount of potassium iodide solution and quiescent time after extraction were investigated.

考察了硫酸溶液的用量、碘化钾溶液的用量及萃取后静置时间等条件对双氧水含量分析的影响。

The result shows the excellent condition was in room temperature, 1-1.5 g of potassium iodide, 5mL of 1mol/L sulfuric acid and keep static station for 30 mm.

结果表明：选择在室温下加入1~1.59碘化钾、5 mL 1mol/L硫酸，静置30 min，结果准确，精密度高。

A plastic tank for sulfuric acid in a sealed vented wood box, power supply, and optional AC unit.

一罐硫酸放在一个密闭的通风的木盒里，电源和可选择的AC电源。

The research results showed that two roll press in the alkaline pulp production or modified horizontal belt filter could be used as extraction equipment,and revealed that the optimum conversion conditions were:sulfuric acid concentration 0.2?

研究结果表明，纤维板废水的提取设备可采用碱法制浆生产中所用的双辊挤浆机或经改装后的水平带式真空洗浆机。

Gingko leaf and its extractive is microwave-aided fast hydrolyzed in ethanol, propyl alcohol, butyl alcohol, acetone and other organic solvent as digest with certain amount of phosphoric acid, sulfuric acid or hydrochloric acid aqua added.

本方法以银杏叶及其提取物为原料，以乙醇、正丙醇、正丁醇及其丙酮等有机溶剂加入一定量的磷酸、硫酸、盐酸水溶液作为水解液，经微波辅助快速水解。

With Puna Chicory as raw material, the research was made on the conversion rate of inulin fructose influenced by hydrolysis time, hydrolysis temperature and the concn. of sulfuric acid through the test of single factor, and the optimal technology parameters for inulin hydrolysis were determined by orthogonal experiment integrating with variance analysis and their results were verified.

方法］以普那菊苣为材料，单因素试验研究水解时间、水解温度、硫酸浓度对菊粉果糖转化率的影响，正交试验结合方差分析确定菊粉水解的最优工艺参数，并进行验证。

The characteristics and main concerns in design are described of Chinese first high temperature pipe evaporator in sulfuric acid production by pyrites.

介绍国内第一台硫铁矿制酸高温热管蒸发器的性能特点和设计的主要思路。

It has been observed that pyrocatechol and m-phenylenediamin can sensitively inhibit the discoloration of neutral red oxidation by the H2O2 and in the presence of catalyzer Fe in dilute sulfuric acid solution but the inhibitory effects of two organic compounds can not be added. Based on this research, the advantages of artificial neural network were adopted to handle the experimental data and a new inhibitory kinetic spectrophotometry of simultaneous determination for pyrocatechol and m-phenylenediamin with artificial neural networks was established.

在硫酸性介质中，Fe能够催化H2O2氧化中性红褪色反应，邻苯二酚和间苯二胺都能阻抑该催化氧化褪色反应的速度，研究发现：两者对Fe催化H2O2氧化中性红褪色反应阻抑作用不具有加和性，根据这一现象，用人工神经网络处理非线性体系的优势进行数据处理，从而建立了一种新的测定邻苯二酚和间苯二胺混合物的人工神经网络阻抑动力学光度法。

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％。