查询词典 phosphoric acid

Ethylene glycol glycosides,useful as humectant in cosmetics,were prepared by phosphoric acid-catalyzed acetalization of glucose with ethylene glycol.

在磷酸催化下，由葡萄糖和乙二醇经缩醛化反应制备了乙二醇葡糖苷，可用作化妆品保湿剂。

Antioxidant 2,2′-methylene-bis(4-ethyl-6-tert-butylphenol) is synthesized by condensation of formalin and 4-ethyl-2-tert-butylphenol which is prepared by alkylation of p-ethylphenol with isobutylene in the presence of phosphoric acid or ion-exchange resin as catalysts.

研究了以对乙基苯酚、叔丁醇为原料，在酸性条件下，进行烷基化反应，合成2 叔丁基 4 乙基苯酚，再进一步缩合成抗氧剂425的工艺条件。

Methods: The cyclodextrin, concentration, pH, organic solvent were studied, and the results indicated that the enantiomer of ephedrin and ephedrine levorotatory were baseline separated under the following experimental conditions: uncoated fused silica capillary (75 μm× 68 cm), 25 mmol/L Tris, 2% HP-β-CD and 1% SBE-β-CD, pH was adjusted at 3.0 by phosphoric acid, and 15 kV separation voltage.

以SBE-β-CD和HP-β-CD二元环糊精为手性添加剂，探讨了环糊精种类及浓度、pH、有机溶剂种类等因素对麻黄碱及伪麻黄碱对映体拆分的影响，结果表明：毛细管：未涂渍熔融石英毛细管75μm×68 cm（有效长度60 cm）。分离用缓冲液为25 mmol/L的Tris缓冲液，含2.0% HP-β-CD和1.0% SBE-β-CD，用磷酸调节pH至3.0。

This article introduces a new process for the preparation of dicalcium phosphate anhydrous, which includes dental grade, food grade and pharmaceutical grade, by reacting pure aqueous food grade phosphoric acid with both calcium carbonate and aqueous treated limewash.

介绍了一种以液态食品磷酸与碳酸钙及处理后的石灰水应生产无水磷酸氢钙工艺。

The thermal stability and specific surface area of the samples are improved by using mesitylene and phosphoric acid .Calcining temperature can affect the pore size and morphology of the samples.

经500℃焙绍5h 后，用磷酸处理的样品仍未出现晶相转变的迹象，表明经均三甲苯和磷酸处理后，样品的热稳定性和比表面积均有一定程度地提高。

Technological process and efficiency of the fertilizer potassium metaphosphate from phosphorus, phosphoric acid or phosphate fertilizer and potassium chloride were introduced.

介绍用元素磷和氯化钾生产偏磷酸钾肥料的工艺及产品肥效。

The results indicate that the addition of phosphoric acid to magnesium oxychloride cement pastes can greatly improve the stability of hydration products in the water.

研究表明，在氯氧镁水泥浆中加入磷酸，可以大大提高相应水化物在水中的稳定性。

In addition, carried on the correlation experiment about the mechanism of additive function in the magnesium oxychloride cement foamed concrete, discovered phosphoric acid has the good water resistance effect, and found its appropriately scope.

此外，还对氯氧镁水泥发泡混凝土中改性剂作用的机理进行了相关实验，发现磷酸有较好的耐水性效果，同时确定了其合适的掺量范围。

A kind of new ferritic stainless steel for the paddle wheel of pump used in phosphoric acid slurry has been developed, and the design of its alloying elements and smelting and heat treatments, its microstructures and properties, have been investigated.

研制了磷酸料浆泵叶轮用的一种新型铁素体不锈钢，探讨新型钢的合金成分设计、熔炼与热处理工艺设计、显微组织及性能。

The proposed method is based on the inhibitory effect of resorcinol on the reaction of potassium periodate oxidation of pyronine Y in phosphoric acid medium.

在磷酸介质中，痕量间苯二酚对高碘酸钾氧化吡咯红 Y使其荧光猝灭具有抑制作用，据此建立了动力学荧光法测定痕量间苯二酚的新方法。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。