查询词典 esterification

However, the esterification rate and yield reach 94 % and 89 % with the oil of vitriol as catalyst, and the best reaction conditions are that the weight ratio of catalyst and inhibitor are 2.5 % and 0.6 %, the volume of toluene is 60 mL, the molar ratio of MAA and TEG is 2.2:1 and reaction time is 3 h, and the content of TEGDMA is 88 % analyzed by GC.

以浓硫酸为催化剂，当阻聚剂的用量分别为原料的2.5 %和0.6 %，甲苯用量为60 mL，n：n=2.2∶1和反应时间为3 h时，酯化率和产率分别为94 %和89 %，气相分析TEGDMA的质量百分数为88 %。

The project to be built with an annual output of 20,000 tons a polyethylene terephthalate plant. Adopting advanced and mature direct esterification process for the production of raw materials for purified terephthalic acid and 1,3-propanediol.

本项目拟建设一套年产2万吨聚对苯二甲酸丙二醇酯生产装置，采用国内先进成熟的直接酯化法生产工艺，主要原料为精对苯二甲酸和1，3-丙二醇。

Esterification of terpineol with oxalic acid, chloroacetic acid and trichloroacetic acid by solid superacid MoO3/TiO2 was studied.

研究了MoO3/TiO2固体超强酸催化剂催化松节油与草酸，氯乙酸，三氯乙酸反应的规律。

The invention relates to a process for producing polyethylene terephthalate 1, 3-propanediol, which comprises the following steps: using titanic acid ester as major catalyst, using germanium compounds and cobalt compounds as synergic catalyst, conducting esterification reaction for poly terephthalic acid and 1, 3-propanediol according to the molar 1:1.05-2.2 under the nitrogen pressure of 0.1-0.4MPa and 230-265 DEG C, or conducting ester exchanging reaction for poly terephthalic acid and 1, 3-propanediol according to the molar ratio 1:1.8-2.2 in 160-220 DEG C, decompressing reaction to high vacuum 10-150Pa, wherein the final temperature of reaction is 265-275 DEG C, recovering to normal pressure with nitrogen to obtain the PTT product.

本发明涉及一种生产聚对苯二甲酸1，3-丙二醇酯的方法，采用以钛酸酯为主催化剂，锗化合物和钴化合物为协同催化剂，对苯二甲酸二甲酯和1，3-丙二醇按摩尔1∶1.05-2.2，在0.1-0.4MPa氮气压力和230-265℃下进行酯化反应，或对苯二甲酸二甲酯和1，3-丙二醇按摩尔比1∶1.8-2.2，在160-220℃进行酯交换反应，将反应减压至高真空10-150Pa，反应终温在265-275℃，用氮气恢复到常压，得到本PTT产品；大大缩短了反应时间，直接聚合制备特性粘度在0.7-1.05dL/g的PTT切片，使反应产物色相良好，PTT产品可用于纤维加工及工程塑料领域。

Atalysts ; titanic ; acid ; esterification ; di（2ethyltexyl） phthalate

催化剂；钛酸；酯化；邻苯二甲酸二异辛酯

Keywords glycerol triacetate;ionic liquid catalyst;esterification

三醋酸甘油酯；离子液体催化剂；酯化

Currently, esterification-saponification method is one of important technique to product borneol from renewable resource turpentine.

以可再生资源松节油为原料，经酯化和水解合成冰片是目前工业上生产冰片的重要途径之一。

The number of functional groups, the unsaturation degree, the esterification degree for each mole of oil have also been calculated .

通常油酸，亚油酸和其他脂肪酸以甘油酯的形式，大量地存在于植物油中。

The Rhizopus delemar lipase catalyzed synthesis of isoamyl valerate in organic solvents was studied, and the optimum condition for the esterification was acquired.

德氏根霉菌经固态发酵生产脂肪酶，以此酶为催化剂，在非水介质中合成了正戊酸异戊酯。

In the pervaporation-aided esterification of valeric acid with ethanol, the valeric acid conversion is up to 95. 2%. The data about M5 selectivity and flux are measured for poly-component reacting system.

应用本文研制的化学改性聚酰亚胺膜，研究了渗透蒸发分离过程在戊酸乙酯合成反应中的应用，实验得到的戊酸最大转化率是95.2%，并研究了膜对多元反应物系的选择性，及膜的透过量。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。