查询词典 carbonate acid

This project mainly exploratorily studied that polyurethane was produced via condensation reaction between polyhydroxylated compounds and methyl carbamate, which was firstly synthesized by dimethyl carbonate and amines. The process is a green route because it turns away the synthesis and the utilization of toxical isocyanic acid ester.

本项目主要探索性地研究了碳酸二甲酯和胺类化合物反应生成氨基甲酸甲酯，然后氨基甲酸甲酯再和多羟基化合物直接反应得到聚氨酯材料，从而避免了异氰酸酯的合成和使用。

The contact - metasomatic iron deposit, which emerges between intermediate - acid magmatic rock and carbonate rock, is controlled by geologic structure.

产于中酸性岩浆岩与碳酸盐岩接触带的接触交代型铁矿，受地质构造条件的控制，在安林地区形成了两条成矿带，包含8个矿田。

Deoxybenzoin(3) was prepareded by using the resorcinol and substituted phenylacetic as starting meterials in microwave-mediated.Then the compound(3) was reacted with acetic anhydride to produce(4).The compound(4) was hydrolyzed to convert compound(5) in the acid-mediated. The compound(5) was reacted with the 1,2-dibromo-ethane and 1,3-dibromo-propane in refluxed condition with acetone as solvent to give(6) or(7),respectively.Lastly,the title compounds were synthesized by refluxing(6) or(7) with 2-methyl-benzimidazole and potassium carbonate in acetone solution.

以取代苯乙酸和间苯二酚为起始原料，用微波辐射法合成脱氧安息香(3)，(3)与乙酸酐缩合生成2-甲基-7-乙酰氧基异黄酮(4)，(4)在酸性条件下水解生成相应的异黄酮(5)，化合物(5)分别与1，2-二溴乙烷和1，3-二溴丙烷反应生成(6)和(7)，化合物(6)和(7)再分别与2-甲基苯并咪唑偶合生成目标化合物。

And a novel synthesis process of dimethyl carbonate from urea and methanol was proposed. Polyphosphoric acid is used as the catalyst and the coupling reagent in the process.

应用共生耦合理论对尿素醇解法制备碳酸二甲酯的合成反应体系进行了分析，提出了一种由尿素和甲醇制备碳酸二甲酯的新工艺。

Four different power samples,sulfanilic acid anhydrous,soluble starch,graphite and calcium carbonate,with different content of carbon were used to determine the influence of element speciation on the properties of laser-induced spectroscopy.

对具有不同碳元素存在形态的4种化学纯试剂(无水对氨基苯磺酸、可溶性淀粉、石墨和碳酸钙)进行激光诱导击穿光谱实验。

This follows the data from Firth,[9] where the observed time required to completely oxidize the magnetite in the fluxed pellets was longer than that recorded by Papanastassiou and Bitsianes[1] using acid magnetite pellets that contained no carbonate flux.

在此之前，从河口，[9]这里观察所需的时间完全氧化球团在熔磁铁矿数据长于由Papanastassiou和Bitsianes [1]记录使用酸含有磁铁矿颗粒没有碳酸盐通量。

Basic copper carbonate with high purity was prepared from copper scraps via lixiviating with dilute nitric acid,reacting with sodium bicarbonate and poaching.

以废杂铜为原料，用稀硝酸浸出硝酸铜溶液，与碳酸氢钠反应得到碱式碳酸铜粗品，漂洗后得到高纯度碱式碳酸铜。

The effect of reaction temperature, time, water volume, oxidant, acetic acid, ethanol, and sodium carbonate on the yield of reducing sugar were investigated.

在亚临界水的状态下对稻壳和麦麸进行水热糖化实验，考察了反应温度、反应时间、加入水的体积以及氧化剂、醋酸、乙醇、碳酸钠等对还原糖产率的影响。

And the best conditions were as following: alcohol as solvent, sodium carbonate as acid absorbing agent, refluxing for 8h.

通过因素分析确定了合成RNB的最优化条件为：以乙醇为溶剂，Na_2CO_3为缚酸剂回流反应8h。

The optimum conditions of synthesize RNB had been accomplished by the methods of factor analysis. And the best conditions were as following: alcohol as solvent, sodium carbonate as acid absorbing agent, refluxing for 8h.

通过因素分析确定了合成RNB的最优化条件为：以乙醇为溶剂，Na_2CO_3为缚酸剂回流反应8h。

For a big chunk of credit-card losses; the number of filings (and thus charge-off rates) would be rising again, whether

年美国个人破产法的一个改动使得破产登记急速下降，而后引起了信用卡大规模的亏损。

Eph. 4:23 And that you be renewed in the spirit of your mind

弗四23 而在你们心思的灵里得以更新