丁二酸的

In order to carry out the separation of the azeotropic mixture dipropyl ether + 1-propyl alcohol by extractive distillation, we are studied the influence on the phase equilibria behavior four different solvent: 1-pentanol [2], butyl propionate [3], N,Ndimethylformamide [4] and 2-ethoxyethanol.

为了用萃取性蒸馏法分离二丙醚和1－丙醇组成的共沸混合物，我们正在研究4种不同溶剂对相平衡行为的影响：1-戊醇[2]、丙酸丁酯[3]、N，N－二甲基甲酰胺[4]和2-乙氧基乙醇。

As can be seen in Fig. 5, dipropyl ether will be recovered in the distillate using 1-pentanol, N,N-dimethylformamide and 2-ethoxyethanol as entrainers and butyl propionate is the only entrainer studied that inverts the volatility of the azeotropic mixture.

从图 5可以看出，使用1-戊醇、N，N-二甲基甲酰胺和2-乙氧基乙醇作为共溶剂时二丙醚将在馏分中回收，丙酸丁酯是唯一与共沸混合物挥发性相反的共溶剂。

The extracted components were qualitatively and quantitatively analyzed by gas chromatography mass spectrometry.The results showed that 30,26 compounds were identified from the volatile components extracted by DSE,SDE methods resp.36 kinds of components were extracted by 2 methods in total,among them the content of hexadecanoic aci...

结果表明，从DSE、SDE法提取的挥发性成分中分别鉴定出30(总含量58.24μg/g)、26种化合物总含量(86.66μg/g，2种方法共提取出36种化合物，其中十六酸含量最高，其次为亚油酸、油酸、邻苯二甲酸二异丁酯、间甲苯甲醛、龙脑。

Isopropyl 1,3 benzodioxolane was synthesized from catechol and isobutyric aldehyde using the phosphotungstic acid supported on activated carbon as catalyst.

以邻苯二酚和异丁醛为原料，活性炭固载磷钨酸为催化剂合成了杀虫剂呋喃丹的中间体2 -异丙基- 1，3-苯并二氧五环。

Isocyanurate was qualitatively identified by infra-red absorption spectroscopy analysis, the quantity of isocyanurate was calculated according to mass fraction of NCO measured by di-n-butylamine method, the thermal stability of prepared elastomers was characterized by thermogravimetric analysis.

用红外光谱法证实了产物中异氰脲酸酯的存在，根据用二正丁胺法测得的NCO基团的质量分数可计算出异氰脲酸酯的质量分数，用热重法分析了产物的热稳定性。

The antioxidant activity of the lipid-soluble epigaliocatechin-3-0-gallate-4'-myristate in soybean salad oil were investigated and compared in AOM test. Results: The results demonstrated that the antioxidant activity of the single-substitution EGCG myristate was almost corresponding to TBHQ.

结果：该脂溶性的EGCG衍生物为长碳链单取代的儿茶素－表没食子儿茶素－3-0-没食子酸－4'-肉豆蔻酸酯，在大豆色拉油中的抗氧化活性与叔丁基对苯二酚相当。

The optimal reaction conditions were as follows:chloroform was used as the reaction solvent,3,5-propionyl acid 0.02 mol,sulphoxide diloride 0.054 mol,the reaction temperature 50℃ and the reaction time 5 h. Under these conditions,the yield of product was 98.9%.

对酰氯合成条件进行了研究，得出优惠反应条件为：以氯仿作溶剂、β-（3，5-二叔丁基-4-羟基苯基）丙酸0.02 mol、二氯亚砜0.054 mol、反应温度50℃、反应时间5 h，优惠条件下产品的收率为98.9％。

Water-soluble air drying alkyd resin is formulated by flax oil acid,trimethylol propane,dimethyl isophthalate,benzoic acid,maleic anhydride and trimellitic anhydride.

以亚麻油酸、三羟甲基丙烷、间苯二甲酸、苯甲酸、顺丁烯二酸酐、偏苯三酸酐为原料合成水溶性醇酸树脂，中和后制得的涂料具有干性好、硬度高、耐水性和贮存稳定性优良等特性。

In the end, the synthesis condition and influential factors of PU-titania (TiO2) process, such as manufacturing sol (including the amount of water, the amount of PU/Titanium butyrate, the concentration of the solution, the pH value, the kind of alcohol), aging process, theoretical analysis of the dipping process, dry and heat treatment of the gelation, were also discussed especially. FT-IR、SEM、TEM、DLS techniques were applied to analyze and study the reaction mechanism and watch the surface and section of the PU-TiO2 membrane. According to above, it was inferred that PU-TiO2 membrane (containing K600) was better composite.

本文采用原位合成法制备了聚氨酯-二氧化钛水分散复合体，并着重对影响制备稳定透明的复合体的因素（包括加水量、醇的加入量、pH值、聚氨酯/钛酸四丁酯投入量、醇种类）进行讨论，利用红外光谱技术分析聚氨酯-二氧化钛分散复合体的结构，动态光散射技术与扫描电镜分别表征复合分散体的粒径大小与分布及复合膜的表面形态，结果显示含K600的聚氨酯-二氧化钛体系复合情况良好。

The reaction was investigated in the synthesis of maleate using maleic anhydride and methanol as raw materials and solid acid as catalyst, and it was found that sodium bisulfate catalyzed the reaction more efficiently than that of molecular sieve.

考察了固体酸对顺丁烯二酸酐和甲醇合成马来酸酯的催化作用，结果表明，硫酸氢钠比分子筛的催化效果好。

I am accused of being overreligious," she said in her quiet, frank manner,"but that does not prevent me thinking the children very cruel who obstinately commit such suicide.""

客人们在卡罗利娜·埃凯家里，举止就文雅一些，因为卡罗利娜的母亲治家很严厉。

Designed by French fashion house Herm è s, this elegant uniform was manufactured in our home, Hong Kong, and was the first without a hat.

由著名品牌 Herm è s 设计，这件高贵的制服是香港本土制造，是我们第一套不配帽子的制服。