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The yield of monoammonium glycyrrhizinate was 1.30% and content was 95% by the lixiviation, ammoniation, acidation, decoloration and recrystal.

经过浸提、氨化、酸化、脱色、重结晶过程可得到含量为95%的甘草酸铵,甘草酸铵的最终提取率为1.30%。

As well as activity was exhibited. Theaddition of cinchonidine led to a remarkable increase in the reaction rate, as confirmed bythe IR study that the modifier activates the carbonyl groups of the reactant through itsquinuclidine nitrogen. On the contrary,〓 exerted a strong inhibition effect on theenantioselective hydrogenation. Chapter 3 Finely dispersed polyvinylpyrrolidone-stabilized iridium andbimetallic clusters were prepared by the alcohol-water reduction method.

第三章 采用醇水还原的方法制备了聚乙烯基吡咯烷酮稳定的铱纳米簇及双金属纳米簇,对丙酮酸甲酯的催化氢化表明,在铱金属簇催化体系中,辛可尼定不仅诱导了一定的对映选择性,同时对反应活性有明显的促进作用,平均反应速率可提高2-6倍。

Rye dough leavening is achieved by a sour dough formulation which includes lactic and acetic acid bacteria.

黑麦面团的发酵可通过使用乳酸菌和乙酸菌来酸化面团来完成。

Straw application, whether straw mulch or incorporated straw with soil, increased the content of soil labile organic carbon and incorporated straw with soil as more beneficial to the increase of the contents of hot water-extractable carbon, potentially mineralizable carbon acid-extractable carbon, readily oxidizable carbon, particulate organic carbon, and light fraction organic carbon.

表施秸秆和混施秸秆均能使土壤活性有机碳含量增加或显著增加,混施秸秆较表施秸秆更有利于热水提取态碳、可矿化碳、酸提取态碳、易氧化态碳、颗粒有机碳和轻组有机碳含量增加,而可溶性有机碳和微生物生物量碳的变化与秸秆施用方式关系不大。

As a precursive work of polymerization directly from vesicles, a polymerizable surfactant, allyl dodecyl dimethylammonium bromide was synthesized, and spontaneous stable vesicles were formed from aqueous solutions of ADDB and sodium dodecyl sulfonate in equimolar composition.

作为可聚合囊泡制备的前期基础工作,研究了一种可聚合的囊泡体系:1-丙烯基-2,2,二甲基-十二烷基溴化胺和ADDB与十二烷基磺酸钠的等摩尔比混合体系。

When SiO〓-NH〓-Rh-Co complex was used to catalyze the hydroformylation of methyl methacrylate, an optimal conversion of 93.4% and optimal selectivity of 84.4% for the normal aldehyde were both obtained at Rh/Co ratio of 2/1, which were both higher than that catalyzed by SiO〓-SiNH〓-Rh and SiO〓-Si-NH〓-Co momometallic catalysts. Clearly a synergistic action between Rh and Co atoms presented in the complex.

我们以SiO〓-Si-NH〓-Rh-Co催化甲基丙烯酸甲酯的醛化反应,当催化剂中Rh/Co比为2/1时,催化活性最高,可达93.4%,对正构产物β-甲酰异丁酸酯的选择性达到84.4%,都高于单金属催化剂,表明了金属间存在相互作用。

At the same time,the contamination removal effect and the system stability under different condition of HRT of aeration part and anoxic part were studied in this paper.

试验同时还考察了不同HRT条件下,水解酸化段对污染物去除效果及对废水可生化性的影响。

However,they are generally insoluble and infusible in their fully imidized form,which would lead to processing difficulties;and this process of polyintermediate has several inherent problems such as emission of volatile byproducts(e.g.,H_2O)and storage instability etc.

然而,完全亚胺化的芳香族聚酰亚胺通常不溶不熔,难于加工,而采用聚酰胺酸中间体加工时,又存在储存稳定性差,加工过程中会产生可挥发小分子副产物(如;H_2O)等问题。

Under the same conditions,the extraction rate of water-soluble dietary fiber was 1.19 % when the acidifiers was citric acid.

在相同条件下,柠檬酸作为酸化剂提取率可达到1.19%,且产品的品质优于盐酸和乙酸。

The results show that perfect anatase nanocrystalline TiO2 can be obtained by SGRTSE method and the photocatalytic activity of TiO2 can be improved by doping and surface treatment. In the experimental system, the addings of proper salts are beneficial to the photocatalytic degradation of DBSNa. The pH value of solution, adding amount of TiO2, flow rate of air, and initial concentration are the main influence factors for the photocatalytic degradation of methyl orange, and the apparent reaction order is pseudo-first-order, which could be described by Langmuir- Hinshelwood equation.

结果表明:sol-gel法结合室温溶剂蒸发诱导可制备出晶型良好的锐钛型纳米TiO_2;过渡元素和稀土元素杂原子掺杂,贵金属掺杂和表面酸化处理是有效提高TiO_2光催化活性的途径;试验体系中,在DBSNa的降解过程中加入适量的盐,可以大大加速降解效果;光催化降解水中有机物,溶液pH值,TiO_2投加量,曝气速率,被降解物起始浓度等是影响降解效果的重要因素;对起始浓度较低的有机物光催化降解过程可利用简化的Langmuir-Hinshelwood动力学方程进行描述,反应级数为拟一级。

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