氢氧化钠

Using refined cotton, chloroacetic acid, sodium hydroxide and hydrogen peroxide as main feedstock, sodium carboxymethyl cellulose was made by the process of basification, etherification, abstersion and drying.

以精制棉、氯乙酸、氢氧化钠和过氧化氢为原料，经过碱化、醚化、洗涤、干燥，制得羧甲基纤维素钠。

Blue from blue to achromaticity using a little bit too much of restore reducing sugar,Measure the content of total glucide according to how mach example to be used up.

国家标准GB/T 15 0 38- 1994中规定：[1、2 ] 吸取酒样量要使所含总糖量为0 。2～0 。4g，加盐酸溶液后，加水至2 0mL ，水解、冷却，用氢氧化钠中和到中性。

With methanol as solvent and NaOH as catalyst,the influence of the concentration of NaOH ,reaction temperature and reaction time to the alcoholysis of polyvinyl acetate is studied by the homogeneous design procedure.

使用均匀设计法研究了甲醇作为溶剂，氢氧化钠作为催化剂时，聚醋酸乙烯酯醇解反应中碱的物质的量比、反应温度和反应时间对聚乙烯醇醇解度的影响。

At first,the intermediate of sodium 3-chloro-2-hydroxy propanesulfate was synthesized from epichlorohydrin and sodium bisulfite;And then,using NaOH as a catalyst,the title compound has been synthesized from intermediate and allyl alcohol to reach the yield of about 70%.

先由环氧氯丙烷和亚硫酸氢钠合成中间体3-氯-2-羟基丙磺酸钠，然后中间体再与丙烯醇在氢氧化钠催化下生成目标产物2-羟基-3-烯丙氧基丙磺酸钠。

In this artical,the yeast was modified with several chenical methods such as acidification and dried at different temperature,the acetone processing,sodium hydroxide processing,esterification and cover up the amidogen,and studied it to adsorb the copper ions .

采用酸化并在不同温度下烘干、丙酮处理、氢氧化钠处理、酯化及掩蔽氨基等化学方法对酵母菌进行修饰处理，分别研究其对铜离子的生物吸附情况。

The resultsindicatedthat :combination of urea and so-da had very high effect of increasingthe crude protein content in straw,combination of over 5 percent quickli me and urea hadthe highest efficiency,4 ti mes of that of the ammoniation method with5 percent urea...

结果表明：尿素与氢氧化钠的组合对提高秸秆粗蛋白含量极为有效，5%以上的生石灰与尿素组合提高效率最高，为单纯5%尿素氨化法的4倍。建议生产中根据需要确定尿素剂量。

By soluble manganese salts and sodium hydroxide, potassium hydroxide or ammonium hydroxide activity.

由可溶性锰盐与氢氧化钠、氢氧化钾或氢氧化铵反应制得。

PAN-based carbon fibers were modified by electrochemical treatment using phosphoric acid, sodium hydroxide and ammonium acid carbonate as electrolyte respectively.

分别采用磷酸、氢氧化钠和碳酸氢铵3种电解液对PAN-基碳纤维进行电化学改性处理，研究电解液种类对碳纤维电化学改性效果的影响规律。

The products were identified by IR,NMR,MS and elemental analysis. In our method,K.OH was used in place of NaOH to synthesize benzyl ester of 3,5-dimethyl-4-hydroxybenzoic acid,2',6'-dimethyl-4'-(n-succinimidyloxycarbonyl) phenyl-acridinium-9-carboxylate was purified on a silica gel column with chloroform/ethylacetate(4:l,v/v) as eluent and further purified by triturating with hexane/acetone(2:l,v/v).The luminescence produced by DMAE-NHS is a flash light with maximumemission at 0.4s and decay half-time of 0.9s. The luminescence intensity is 6.11x10 cps/mol,which is affected by the composition of trigger and surfactant.

DMAE·NHS的合成是本论文的关键和难点，我们对文献方法进行改进：文献方法用氢氧化钠与3，5-二甲基-4-羟基苯甲酸反应制得3，5-甲基-4-羟基苯甲酸钠，再用3，5-二甲基-4-羟基苯甲酸钠与苄氯作用制备3，5-二甲基-4-羟基苯甲酸苄酯，我们用氢氧化钾代替氢氧化钠，使合成取得成功；在合成2'，6'-二甲基-4'-苯基-吖啶-9-甲酸酯时，文献方法对粗产品进行两次硅胶柱层析纯化，第一次柱层析用氯仿/乙酸乙酯(4：1，Ⅴ：Ⅴ)作溶剂和淋洗剂，第二次柱层析用己烷/丙酮(2：1，Ⅴ：Ⅴ)作溶剂和淋洗剂，按照文献方法得到的不是所需要的化合物，我们只进行第一次柱层析纯化，然后用己烷/丙酮(2：1，Ⅴ：Ⅴ)进行研磨，过滤，洗涤，除去溶于己烷/丙酮(2：1，Ⅴ：Ⅴ)的部分，得到所需要的产品。

Sodium hydroxide, but the soap and glycerin.

氢氧化钠为碱性，直接碰触会伤害肌肤，但是在制作过程中，和油脂、水一起皂化后就不再是氢氧化钠，而是皂和甘油了。

I can not make it blossom and suits me

我不能让树为我开花

When temperatures are above approximately 80 °C discolouration of the raceways or rolling elements is a frequent feature.

当温度高于 80 °C 左右时，滚道或滚动元件褪色是很常见的特征。