查询词典 anhydride

The influences of the molar ratio of aqua ammonia to maleic anhydride,reaction temperature,reaction time and the quantity of catalyst on the yield of product were investigated.

对影响反应收率的原料配比、反应温度和反应时间以及催化剂的用量进行了研究。

The formation of these features and the role of the maleic anhydride grafted polypropylene were analyzed.

摘 要：采用扫描电镜研究了铝板/聚丙烯粘接试样的拉伸剪切断面形貌特征，分析了其形成原因以及马来酸酐接枝聚丙烯的作用。

The reaction condition parameters of bulk and solution polymerization of maleic anhydride were selected by orthogonal experiment.

探讨了纳米粒子催化马来酸酐本体和溶液聚合，通过正交实验筛选出了最佳反应条件。

Triethyl orthoformate, industry 97 37%; diethyl malonate, industry 98%; acetic anhydride, reagent 97%.

原甲酸三乙酯，工业97 37%；丙二酸二乙酯，工业98%；醋酸酐，试剂97%。

Methylol was led into the surface of carbon black and then graft esterificated with maleic anhydride using the feature that the hydrogen atoms onto the layer surface of carbon black were easily substituted.

为了改善导电炭黑与聚合物间的互容性，利用炭黑表面氢原子易被取代的特点，用甲醛在炭黑表面引入羟甲基，再与马来酸酐进行酯化接枝。

Methylol was led into the surface of carbon black and then graft esterificated with maleic anhydride using the feature that the hydrogen atoms onto the layer surface of carbon black were easily substituted.

摘 要：为了改善导电炭黑与聚合物间的互容性，利用炭黑表面氢原子易被取代的特点，用甲醛在炭黑表面引入羟甲基，再与马来酸酐进行酯化接枝。

The synthesis of dimethyl fumarate was studied from maleic anhydride and methanol with phospho molybdic acid as the catalyst and bromate as the isomerization catalyst by one-step in this short paper.

采用固体杂多酸磷钼酸为催化剂，溴酸盐为异构化剂，经顺酐一步合成了富马酸二甲酯，探讨了醇酐比、反应时间、催化剂的量、异构化剂的量以及异构化时间对合成DMF收率的影响，并确立了最佳反应条件。

Monochloroacetic acid is a rather important chemical raw material and organic intermediate product, which is mainly manufactured by chloride of acetic acid using sulfur and anhydride acetic acid as catalyst.

氯乙酸是一种及其重要的化工原料和有机中间体，目前氯乙酸主要以硫磺或醋酐为催化剂进行乙酸氯化生产而得。

Norbornene-2,3-dicarboxylic acid monomethyl ester was prepared by using 5-norbornene-2,3- anhydride and methanol as raw materials and toluene as solvent.

以5-降冰片烯-2，3-二酸酐和甲醇为原料，正交试验法合成了5-降冰片烯-2，3-二羧酸单甲酯，并对产物结构进行了表征。

The optimum reaction conditions were: at present of acetic anhydride, a stoichiometric quantity of nitric acid, at room temperature for 40 minutes. Nitration of chlorobenzene gave a,50% yield of mononitro compounds, and an ortho-para isomer ratio 0.20 in product distribution of chlorobenzene mononitration.

结果表明：硅钨酸催化性能较好，催化剂载体以纳米二氧化硅最好，反应条件中醋酸酐用量是主要影响因素；SiW_(12)O_(40)~(4-)／纳米SiO_2催化剂具有强对位选择性：在醋酸酐存在下，氯苯与等当量的硝酸室温下反应40分钟，氯苯一硝化产物中邻／对硝基氯苯异构体的质量比达0.2，产率可达50％。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。