酸酐

Acetylated starches with high degree of substitution were synthesized from cornstarch with acetic anhydride as esterifying agent and methanesulphonic acid as catalyst.

以玉米淀粉为原料，醋酸酐为酯化剂，甲烷磺酸为催化剂，制备高取代度淀粉醋酸酯。

Preparation of starch succinate with low substitution degree was studied by using corn starch as raw material,succinic anhydride as esterifying reagent,water as solvent and sodium hydroxide as catalyst.

以玉米淀粉为原料，丁二酸酐为酯化剂，以水为媒介，氢氧化钠为催化剂对低取代度淀粉丁二酸酯的制备工艺进行了研究。

Based on green chemistry,the cleaner production of HPMA(hydrolyzed polymaleic anhydride) has been studied.

以绿色化学为基础，研究了水解聚马来酸酐的绿色合成工艺。

Part I, the Friedel-Crafts acylation on DAA and methyl dehydroabietic acid was carried out with acetyl chloride, benzoyl chloride or phthalic anhydride as acylating regents, anh- ydrous aluminum chloride as catalyst and with different solvents to compare with, we have got t- hree new compounds.

第一部分，分别以脱氢松香酸和脱氢松香酸甲酯为底物，乙酰氯、苯甲酰氯、邻苯二甲酸酐为酰化试剂，无水三氯化铝作催化剂，采用不同的溶剂及反应条件进行傅克酰基化反应，得到3个新化合物。

Terpolymer of acrylic acid/acrylic amide/malefic anhydride was synthesized and mixed with polyepoxysuccinic acid in order to improve the scale and corrosion performance of the latter in this study.

为了提高PESA的阻垢缓蚀性能，合成了丙烯酸／丙烯酰胺／马来酸酐三元共聚物，与聚环氧琥珀酸进行物理复配，考察了温度、反应物配比及浓度对复配产品阻垢和缓蚀性能的影响。

Acid and anhydride functionalized PP, PE and EVA forms are available.

酸或者酸酐功能化 PP 、 PE 和 EVA 等形式都是有的。

ResultsThe purity of compound was 98%. IR showed Naproxin was conjugated to Phaeophorbide in acid anhydride.

结果HPLC测定其纯度为98％，红外光谱显示脱镁叶绿酸和萘普生形成了酸酐交联。

Polyaspartic acid was synthesized using maleic anhydride and ammonium salt as raw materials and characterized by IR and TG-DTA.

以马来酸酐和铵盐为原料合成聚天冬氨酸，对聚天冬氨酸进行了红外光谱和差热-热重分析表征，并对其阻碳酸钙垢及分散氧化铁的性能做了较系统的研究。

Catalytic synthesis of Aspirin over pretreated sodium acetate using salicylic acid and acetic anhydride as starting materials.

以水杨酸和乙酸酐为原料、无水乙酸钠为催化剂合成阿司匹林。

Citric acid anhydride was synthesized by citric acid and acetic anhydride with acetic acid as solvent.

柠檬酸酐是由柠檬酸两个羧基间脱水形成的，具有吸水性和酰化能力，是合成农药、医药、食品、饮料、清洁剂、化妆品和树脂的一种重要的中间体[1-2]。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。