查询词典 iodic anhydride

In esterification of 2,6-NDA obtained from Henkel reaction of 1,8-naphthalenedicarboanhydride catalyzed non-cadmium catalyst zinc carbonate, the effect of process parameters like esterification catalyst and its amount used, reaction temperature and time, and methanol/anhydride molar ration, etc, was investigated.

在碳酸锌催化和二氧化碳气氛中1，8-萘二甲酸酐于300～340℃反应3～4小时，可以较高收率地获得2，6-萘二甲酸粗品，收率达到62％，该产物可以直接用于合成双酯的酯化反应中。

A variety of aldehydes were converted into acylals in good yields with anhydride in the presence of a catalytic amount of zinc bromide under solvent-free conditions.

以醛和酸酐为原料，溴化锌为催化剂，无溶剂条件下高产率地合成了偕二酸酯（其中醛与苯甲酸酐的反应是首次报道）。

Ton large anhydride reaction device and 25m3 anhydrous glucose crystallizer have been listed in national key product program respectively in 2000 and 2003, and forced circulation vacuum evaporating crystallizer has been listed in the 2003 Innovation Fund Program by the Ministry of Science and Technology.

本项目中的2万吨大型反应装置、连续结晶器及强制循环真空蒸发结晶器均通过了国家鉴定和科技部组织的专家评审，2万吨大型苯酐反应装置、25m3无水葡萄糖结晶器被列入2000年、2003年国家重点新产品计划，强制循环真空蒸发结晶器装置被科技部列入2003年创新基金计划。

There are four factors effected on the softening point, which are the amount of maleic anhydride and initiator, reaction temperature and reaction time.

考察了马来酸酐质量分数、引发剂质量分数、反应温度和反应时间4个因素时产品软化点的影响。

Epoxysuccinic acid was synthesized from maleic anhydride using sodium tungstate as catalyst and hydrogen peroxide as oxidizer and was characterized by IR and 13 C NMR.

以马来酐为原料，钨酸钠为催化剂，双氧水为氧化剂，合成了环氧琥珀酸，并对其进行了红外、13C核磁表征。

Such as PVC, urea, the anhydride, caustic soda production plant, or external leakage demanding medium, such as HF, such as phosgene.

如PVC、尿素、本酐、烧碱生产装置中，或对外泄漏要求高介质，如HF，光气等。

In this report, half-esterification between these pendent hydroxyl groups of hydroxyl-PU and maleic anhydride could lead to new pendent groups, carboxylic groups. These highly polar carboxylic groups in the side chain of PU could play the role of internal emulsifier. They had self-dissociation ability in the water or were neutralized first by appropriate amount of base. Then, PU bearing carboxylic group could dispersed steadily in the water, named aqueous-based polyurethane dispersion.

在本论文中，利用原来亲油性Hydroxyl PU主链段上悬挂的羟基经由与琥珀酸酐的半酯化(Half-esterification Reaction)反应后，使PU在侧链上悬挂具有强极性的羧酸基，其可作为聚胺酯分子中的内乳化剂，羧酸基能在水相中自身解离产生离子或加入适量碱使之中合，使聚氨酯高分子能够稳定分散於水中，即所谓水性PU分散液(Aqueous-based Polyurethane Dispersion)。

Polyaspartic acid was synthesized by self-catalysis process with microwave using maleic anhydride and ammonium acetate as raw materials.

以马来酸酐和乙酸铵为原料，在微波条件下用自催化法合成了聚天冬氨酸。

Firstly, we should prepare polyester glycol in order to prepare water-borne polyurethane emulsion used to wooden furniture. Polyester glycols having designed molecular weight of 1000 are synthesized by ethylene glycol and mixture of phthalic anhydride and adipic acid (morl radio =40:60)on condition that molar excess content of glycol is 15%, and high vacuum time is 8h.The produced polyester glycols having the same molecular weight as designed measure up to standard of material. And Water-borne polyurethane emulsion's hardness is better than others are produced by aliphatic polyester glycol.

为了制得性能优越木器用水性聚氨酯乳液，首先我们从制备水性聚氨酯用的原料聚酯二元醇入手，我们设计了分子量为1000的聚酯二元醇，它使用邻苯二甲酸酐和己二酸以摩尔比40：60混合后再与乙二醇反应，反应时醇的摩尔过量15%，真空时间8小时，所得的聚酯二元醇，在此条件下酸值基本上能符合用作聚氨酯原料的要求，所测得的分子量也与设计的分子量非常接近，且用它来制得的水性聚氨酯乳液，其涂膜硬度，相对于单独用脂肪族聚酯二元醇制备的水性聚氨酯的要优。

The Company perennial operating a variety of organic chemical raw materials, varieties include: methanol, ethanol, ethylene glycol, n-butyl alcohol, isobutyl alcohol, isopropyl alcohol, acetic acid, vinyl acetate, acetic acid acetate, acetic acid small lipid , styrene, toluene, phthalic anhydride, xylene, acetone, butanone, cyclohexanone, DMF, sulfuric acid, methyl isobutyl ketone, glycol ether, three toluene, octyl resin, melamine, etc. and so on.

本公司常年经营各种有机化工原料，品种有：甲醇、乙醇、乙二醇、正丁醇、异丁醇、异丙醇、冰醋酸、醋酸乙烯、醋酸乙脂、醋酸丁脂、苯乙烯、甲苯、苯酐、二甲苯、丙酮、丁酮、环己酮、DMF、硫酸、甲基异丁基酮、乙二醇丁醚、三甲苯、二辛脂、三聚氰胺，等等。

In the days of sailing vessels the crew were afraid they would be becalmed on the ocean.

在使用帆船的时代，船员们担心他们会因为无风而无法在海洋上航行。

As long as foreign donors pay the PA's salary bill, few expect a new intifada.

只要外国继续为巴权力机构的薪水买单，希望发动新暴动的人便寥寥无几。