查询词典 citric acid

The making method that also did a citric acid sodium, and the analytical method of citric acid sodium

并做了柠檬酸钠的制备方法，以及柠檬酸钠的分析方法。

Citric acid production with cellulase hydrolyte of wheat stalk by Aspergillus niger , the effects of media component, fermentation at constant temperature, and at periodic variable temperature on citric acid were studied.

以麦草纤维素酶解液为原料，用黑曲霉发酵制备柠檬酸，研究了培养基组成、恒温发酵和周期变温发酵对柠檬酸发酵的影响，结果表明，适宜的培养基组成为NH4 NO3 0 。3%，KH2 PO4 0 。1%，Mg2 + 30 0× 10 -6，Fe2 + 10×10 -6，此时，柠檬酸产量为 10 。5 2 g/L ，糖转化率为 6 0 。80 %。

Citric acid can reduce the Cr(superscript 6+) in sodium dichromate into Cr(superscript 3+) and react with to yield citric acid chromium chelate at 75℃.

在75℃下用柠檬酸将重铬酸钠中的Cr(上标 6+)还原为Cr(上标 3+)，同时与Cr(上标 3+)发生螯合反应，生成柠檬酸铬螯合物。

The orthogonal experimental result showed that the optimum reaction conditions were as follows: citric acid 7.7 g, isoamyl alcohol 21.7 mL(the molar ratio of citric acid to isoamyl alcohol, 1:5); 1.0 g (4% of the total weight of raw material) NaHSO4H2O as catalyst; 25 mL dimethyl benzene as deaquation reagent; microwave irradiation time 15 mm; the yield of product was 83.2%(the rate of esterification was 95.1%).

通过正交实验，得到最佳的工艺条件如下：柠檬酸7.7g，异戊醇21.7mL（酸醇摩尔比为1：5）；一水合硫酸氢钠作催化剂，用量为1.0 g（为原料总质量的4%）；带水剂为二甲苯，用量为25mL；微波辐射时间为15min。

The Ni and Zn-doped spiculate α-FeOOH were prepared by the coprecipitation method and citric acid method using FeCl2、Zn(NO3)2、Ni(NO3)2 and NaOH as raw material and spiculate α-FeOOH as intermediate. Then they successively were enwraped by citric acid complex of the Ni and Zn and heat treated to get spiculate nano-Ni0.5Zn0.5Fe2O4. The particles size and slenderness ratio of spiculate nano-Ni0.5Zn0.5Fe2O4 were successfully controlled by the doped mass of Ni and Zn in the coprecipitation process.

以FeCl2、Zn(NO3)2、Ni(NO3)2和NaOH为原料，借助针状α-FeOOH做为中间体，有效的把共沉淀法和柠檬酸法相结合，制得掺有镍和锌的针状纳米α-FeOOH，在其表面包裹镍和锌的柠檬酸络合物后，经热处理制得了针状的纳米Ni0.5Zn0.5Fe2O4 ，并通过控制共沉淀法过程中镍和锌的掺入量，有效的控制了针状纳米Ni0.5Zn0.5Fe2O4 的粒径和长径比。

Citric acid is one of the organic acids commonly used as chelators. In this study, we would compare with cleaning efficiency between citric acid and acetic acid.

首先，我们会探讨这两种螯合剂浸润的能力，用来评估晶圆表面在清洗过程中是否可均匀的移除铜离子。

In a product free of citric acid or citrates, for oral ingestion, the taste of arginine is counteracted by lactic, malic or adipic acid; in a formulation for tube-feeding, citric acid and citrates in a specified ratio controls the product's stability.

在不含柠檬酸或柠檬酸盐的用于口服的产品中，通过乳酸、苹果酸或已二酸来抵消精氨酸的味道；在用于管饲的制剂中，以特定比例的柠檬酸和柠檬酸盐控制产品的稳定性。

A stream of wastewater from citric acid production process was treated by using a biological process of the following steps: wastewater from citric acid neutralization→cultivating feed yeast→solubles tank→photosynthetic bac-teria tank→activated sludge tank.

采用柠檬酸废水→培养饲料酵母→可溶化槽→光合细菌槽→活性污泥工艺流程处理柠檬酸废水，实验结果表明，技术可行：原废水中COD_和BOD_5的总去除率达98％以上，达国家GB8978-88排放标准；

Reaction of citric acid with paraformaldehyde gave anhydromethylene citric acid with a yield of 63%;the reaction of compound with acetic anhydride gave the corresponding anhydride with a yield of 87%;the esterification of compound with lauryl alcohol gave anhydrocitric acid monoester with a yield of 76%.

将等浓度的柠檬酸和多聚甲醛加热，反应生成柠檬酸缩醛环酯，产率为63%；与乙酸酐反应得到相应的柠檬酸酐，产率为87%；与月桂醇酯化，生成产物，产率为76%；用二氧六环做溶剂，将与等浓度的碱进行开环反应，生成柠檬酸月桂醇单酯，产率为83%。

Citric acid lauryl alcohol ester was synthesized by the esterification of citric acid with lauryl alcohol using p methylbenzenesulfonic acid or cation exchange resin as the catalyst.

分别用阳离子交换树脂和对甲苯磺酸催化柠檬酸和月桂醇进行酯化反应，合成了柠檬酸月桂醇酯。考察了催化剂用量、原料配比、反应时间和反应温度等对合成反应的影响，优化了合成工艺条件。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。