磺酸

The results indicate that the optimized sulfonylation reaction time is 4 h, the materiel rate of chlorosulfonic acid and 2-chloroimidazo[1,2-α]pyridine is 1.2 : 1, with ethylamine the yield increasing from 15.4% to above 70%; the optimized ammonolysis reaction time is 3 h and the reaction temperature is 27℃, with the acetonitrile yield increasing from 60.1% to above 79.6%.

实验结果表明，磺酰化反应的最佳反应时间为4 h，氯磺酸与2-氯咪唑并[1，-α]吡啶的用量比为1.2：1，加入三乙胺可将收率由15.4%提高到70%以上；氨解反应的最佳反应时间为3 h，反应温度为27 ℃，加入乙腈可将收率由60.1%提高到79.6%；方案经改进后，总反应时间缩短3 h，收率提高了5.5%。

Under the conditions of stir speeds 400 r·min~(-1) and distance between anode and cathode 1 mm, by using the orthogonal design, the optimum technological conditions were found that the current density was 0.3 A·cm~(-2), initial NaOH concentration in catholyte was 50 g·L~(-1), reaction times of two steps were all theoretical electrochemical reaction times. In the first electrosynthesis, initial Na_2CrO_4 concentration in anolyte was 650 g·L~(-1), and reaction temperature was 80℃. In the second electrosynthesis, initial Na_2Cr_2O_7 concentration in anolyte was 700 g·L~(-1), and reaction temperature was 85℃.

324全氟磺酸增强复合阳离子交换膜、阴阳极液中搅拌速度均为400r·min~(-1)条件下，通过正交实验得到优化工艺条件为：电流密度0.3A·cm~(-2)，阴极液氢氧化钠初始浓度50g·L~(-1)，两步反应时间均为理论电催化反应时间，第一步阳极液铬酸钠初始浓度650g·L~(-1)，反应温度80℃，第二步阳极液重铬酸钠初始浓度700g·L~(-1)，反应温度85℃。

ABSTRACT AIM: to study the antidotal mechanism of sodium dimercaptopropanesul fonate on ethyl thioethylsulfonate.

目的：研究二巯丙磺钠对乙基硫代磺酸乙酯(抗菌剂402， ethy l thioethylsulfonate，简称ET)解毒机制。

The influences of different surfactants (sodium dodecyl sulfate, sodium cholate and sodium deoxycholate), different electrolytes (sodium phosphate monobasic, sodium tetraborate and 3-cyclohexylamino-1-propane sulfonic acid), buffer pH and organic modifiers on the determination of sialic acid were studied.

其次建立了一种测定唾液酸的在线富集CZE法，该方法用40 mM磷酸二氢钠为缓冲溶液电解质，通过将样品溶解在乙腈：水=2：1的样品基体中，进样时间增加到100 s来达到样品富集的效果，并考察了样品基体中乙腈浓度和进样时间对富集效果的影响，研究了用硼砂或3-环己胺-1-丙烷磺酸作为电解质、缓冲溶液pH值和有机修饰剂的加入对唾液酸检测的影响。

Methods Polysulfated DS was prepared with chlorosulfonic acid and the main disaccharide units were determined with 1H-NMR and 13C-NMR.

方法用氯磺酸磺化制备多硫酸化DS。测定其1H-NMR和13C-NMR光谱确定主要双糖单位。

The synthesis of a series of photo generating acid by alkylation, acyl chloriding, esterification with the available anthraquinone-2-sulfonic Na is emphasized.

本文以商业化的蒽醌-2-磺酸钠为原料，经过烷基化、酰氯化、酯化3个步骤合成了一系列释酸剂，并利用红外谱图，对每一步所得结构进行表征，对影响反应的因素进行了研究，并对释酸剂的应用结果进行了讨论。

Laccase could degrade the conjugated resin acids and unsaturated fatty acids in model emulsions to some extend in the presence of ABTS2,2\'-azinobis(3-ethylbenzthiazoline-6-sulfonate or VIO.Palustric acid and abietic acid in DCS of Masson pine CTMP could be partially removed by lacaase treatment without addition of external mediator.

漆酶在ABTS2，2-连氮-二(3-乙基苯并噻唑-6-磺酸或紫尿酸存在的条件下可以降解带有共轭双键的树脂酸和不饱和脂肪酸；在不加介体的情况下漆酶处理可以除去马尾松CTMP的DCS样品中的部分长叶松酸和枞酸。

He chromatographic conditions for separation and detection of organic acids and inorganic weak acids with ion exclusion chromatography and nonsuppressed conductivity detection are described in this paper.

用非抑制型电导检测的离子排斥色谱法，以对甲苯磺酸为淋洗液，研究了柠檬酸、苹果酸、抗坏血酸、乙醇酸、甲酸、乙酸、丙酸及氢氟酸和碳酸的色谱分离及定量检测条件。

In this paper, the orthogonal experimental analysis method is used to study on the effects of molar ratio of the unsaturated vinyl monomers, with carboxylic groups or sulphonic groups or polyoxyethylene side chain groups,etc., and the effects of the mean degree of polymerization in PEO side chains.

根据聚羧酸系高效减水剂的结构特点，采用正交试验分析法，分别研究了带羧基、磺酸基、聚氧化乙烯链酯基等活性基团的不饱和单体的物质的量之比及聚氧化乙烯链的聚合度等因素对聚羧酸系减水剂性能的影响，从而得出合成聚羧酸系高性能减水剂的一种最佳配方，并对试制产品进行了性能试验。

Inorganic, or mineral, acids include sulfuric acid, nitric acid, hydrochloric acid, and phosphoric acid.

酸包括硫酸、硝酸、盐酸和磷酸等无机酸或矿物酸，以及羧酸、磺酸和酚类等有机酸。

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％。