乙烯的

Objective: To establish a method for determination of dichloromethane, 1,1-dichloroethylene and 1,2-dichloroethylene in drinking water with headspace gas chromatography.

目的：探讨生活饮用水中二氯甲烷、1，1二氯乙烯和1，2二氯乙烯的顶空气相色谱测定方法。

It is the catalyst for converting ethylene to ethylene oxide, the precursor of many organic chemicals.

在将乙烯转化成氧化乙烯的过程中要以银作催化剂。

Multi block copolymer poly p phenylene vinylene co poly(ethylene oxide(PPVEO200 and PPVEO600) was synthesized by Wittig reaction.

通过经典的Wittig反应，成功合成了聚对苯亚乙烯和2种分子量聚氧化乙烯的多嵌段共聚物(PPVEO200和PPVEO600)。

A complete mathematical model based on the reaction mechanism for the production of polyvinyl acetate was developed.

利用现场工况数据，模型可以实时预报醋酸乙烯的转化率、各组分物料浓度、聚醋酸乙烯聚合度等重要参数。

The results showed that the fiber had the function of absorbing toluene and trichloroethylene after introducing HEMA into macromolecules, and the absorptive process obeyed Hill equation of sigmoidal model.Toluene and trichloroethylene absorbency increased with the increase of mass fraction of HEMA,and their maximum absorbency was 10 g/g and 21 g/g,respectively.The ratio of remaining fiber also increased with the increase of mass fraction of HEMA to make organic liquid retention ratio strengthen.Furthermore,dynamic mechanical performance of the fiber was affected by mass fraction of HEMA obviously, and the segments movement was influenced more obviously.At the same time,mass fraction of HEMA had a great impact on the surface and cross section morphologies,especially,many cavities existed in surface, and cross section had a lot of holes with asymmetric size when mass fraction of HEMA was equal to 15 wt%.

结果表明，HEMA引入大分子后，所得纤维对有机液体甲苯、三氯乙烯具有吸附功能，且吸附过程符合sigmoidal模型中的Hill方程；随HEMA质量分数的增加，纤维对甲苯和三氯乙烯的饱和吸附量增大，对甲苯和三氯乙烯的最大吸附量分别可达10 g/g和21 g/g；随HEMA质量分数的增加，纤维剩余率增加的同时，使纤维对甲苯和三氯乙烯的握持能力增强；HEMA质量分数对纤维动态力学性能有突出影响，特别是链段运动受其影响更为明显；HEMA质量分数对纤维表面和断面形貌均有显著影响，特别是当HEMA质量分数为15 wt%时，所得纤维表面出现了许多空洞，其断面存在许多尺寸不均的空洞。

Results showed that the kinetics of photocatalytic degradation of ethylene by TiO2/ACF desoposited Pt in the simulated cold storage environment for horticultural products could be described using the pseudo first-order equation. The prepared TiO2/ACF-Pt, in the process of which Pt was initially deposited on the surface of ACF and then TiO2 was coated, would promote the activity of ethylene decomposing. When ion sputtering time was 60 seconds (Pt/Ti atomic concentration ratio was 0.112), the apparent rate constant of the reaction of TiO2/ACF-Pt was 1.16 times as much as that of TiO2/ACF. The micrographic structure of ACF was not damaged and an excessive porous structure, which was contributive to absorbing the diluted ethylene, was obtained by the way of ion sputtering Pt.

结果表明：在模拟园艺产品冷藏环境中，TiO2 /ACF-Pt光催化降解乙烯的动力学可用表观一级速率方程来描述；ACF表面先溅射沉积Pt，再进行TiO2附着方案，能提高降解乙烯的能力，当溅射时间为60 s（Pt/Ti原子浓度比为0.112）时，表观一级速率常数是未溅射Pt的1.16倍；TiO2/ACF-Pt的制备方法，对ACF形貌结构没有破坏，并能得到有利于对微量乙烯的吸附的多孔结构。

It is discussed that how the preparation methods of the catalyst for trichloroethylene by dehydrochlorination from tetrachloroethane ,the reactor materials,ferric chloride,the impurity 1,1,2-trichloroethane and the high boilers contained in raw material tetrachloroethane and the operating conditions influence the catalyst.

探讨了四氯乙烷脱氯化氢制三氯乙烯所用催化剂的制备方法、反应器材质、氯化铁、原料四氯乙烷中的杂质1，1，2-三氯乙烷和高沸物及操作条件对催化剂的影响，从而指导四氯乙烷脱氯化氢制三氯乙烯的工业生产，提高催化剂的效率，延长催化剂的寿命，消除不利的影响因素，提高产品质量，降低生产成本，确保三氯乙烯生产的长期、稳定运行。

The gene has smaller homology with these ACC synthase genes expressed by other inductions.

由于CS-ACSG基因与乙烯的形成有关，因此比较了不同性别表型黄瓜各品种内源乙烯释放和EFE活性的差异，结果表明：CS-ACSG基因与雌性系黄瓜的内源乙烯释放及EFE活性之间并不存在着直接的联系。

At first, the rought C〓F〓 mixed gases are obtained by pyrolysis process of R22. A experimental pyrolysis device is designed and made by ourself. The optimum operating conditions are offered in the paper. Secondly, the much efforts is on the synthesis of R134. After through the discussion of basic thermodynamics and kinetics, selecting and preparating catalyst, it is possible that the synthesis of R134 by pyrolyzed gases hydrogenation. Base on the character of catalytic process, the kinetics equation about C〓F〓 catalytic hydrogenation is established. The rate constant of the reaction is obtained through experiment data regression. In order to achieve higher yield of R134, some optimum technological conditions is determined.

论文首先对R22裂解制成四氟乙烯混合原料气的裂解过程进行了讨论，自行设计和制作裂解反应装置，并确定裂解反应的最佳操作条件；然后，重点对R134的合成进行基础研究，分别从热力学和动力学的角度探讨以含四氟乙烯的R22裂解混合气为原料合成R134这一全新工艺的可能性，选择和制备加氢催化剂，根据催化过程特点建立四氟乙烯催化加氢反应的总包动力学方程，并在此基础上自行设计和制作中试合成装置，获得了以裂解混合气为原料合成R134的最佳工艺条件，为R134的工业化生产提供了必要的理论依据和实验基础。

DETERMINATION OF VINYL IN VINYL CHLORIDE ACETATE COPOLYMERS.

氯乙烯一乙酸乙烯共聚物中醋酸乙烯的测定

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。