乙炔

Bathochromic shifts of the emission maxima also occurred and increased with the enhancement of the substituents electron-donating ability.

在把催化下通过4-甲基一7一碘香豆素和苯乙炔的偶联反应制备了7一位苯乙炔基取代香豆素化合物。。

Bathochromic shifts of the emission maxima also occurred and increased with the enhancement of the substituent's electron-donating ability.

在钯催化下通过4-甲基-7-碘香豆素和苯乙炔的偶联反应制备了7-位苯乙炔基取代香豆素化合物。

The present invention has the hot treating furnace pre-vacuumized to 10-100 Pa, introduced with high purity nitrogen and heated to 900-1050 deg.c, before maintaining and introducing acetylene gas to carburize at nitrogen pressure of 0.1-0.11 MPa and acetylene gas pressure of 5000-20000 Pa.

本发明通过向设有炉内循环风机的热处理炉进行预抽真空至10-100Pa，通入高纯氮气，再将炉温升至900-1050℃，保温后再通入乙炔气进行渗碳，炉膛内氮气的压力为1×10 5 -1.1×10 5 Pa之间，充入的乙炔分压为5000-20000Pa之间。

The present paper describes the effect of the ethine absorbed and solved in the liquid oxygen on the liquid oxygen in the main condenser-evaporator since revamp of the air separation unit with liquid air and liquid oxygen absorber into the air separation unit with molecular absorber as well as measurement of the ethine content.

阐述空分设备由一般的液态空气吸附器和液态氧吸附器改造为分子筛吸附器后，吸附溶解在液态氧中的乙炔对主冷液态氧的影响程度及乙炔含量的检测。

Examples of highly unsaturated hydrocarbons include without limitation acetylene, methylacetylene and propadiene.

高度不饱和烃的实例包括但不限于乙炔、甲基乙炔和丙二烯。

In an embodiment, the selective hydrogenation catalysts of this disclosure are used in the hydrogenation of highly unsaturated hydrocarbons such as for example and without limitation acetylene, methylacetylene, propadiene or combinations thereof.

在实施方案中，本公开的选择性加氢催化剂被用于高度不饱和烃的加氢中，其中所述高度不饱和烃例如但不限于乙炔、甲基乙炔、丙二烯或它们的组合。

The unsaturated hydrocarbon stream 10 primarily comprises one or more unsaturated hydrocarbons, but it also contains one or more highly unsaturated hydrocarbons such as for example and without limitation acetylene, methylacetylene and propadiene.

所述不饱和烃料流10主要包含一种或多种不饱和烃，但它也含有一种或多种高度不饱和烃例如但不限于乙炔、甲基乙炔和丙二烯。

First,adding the calcium carbide to react with the water in sodium pyrosulphate to get acetylene gas,then the acetylene content is determined by gas chromatograph,therefore the water content in the sample can be calculated.

先用电石将水分转化为乙炔气，然后用气相色谱仪检测乙炔的含量，从而得出样品中水分含量。

Furthermore,the adsorption of acetylene on the Ni(111)surface is investigatedby DV-Xα method,as well as its migration pathway from the aligned bridgesite,the favorite adsorption site for ethylene,to the cross-bridge site.Afterstudying several reaction pathways of C2H2 on Ni(111),we find that acetylene,as the product of dehydrogenated ethylene,will migrate from the alignedbridge site to the cross-bridge site with a very small energy barrier,0.02eV.

给出了乙炔在各个吸附位的吸附结构，并在假定乙烯在脱氢前没有迁移的基础上，对各种可能的反应途径作了模拟研究，发现乙炔在平行桥位的吸附结构不稳定，通过1.24的平移和30度的旋转的耦合，迁移到垂直桥位，迁移过程中只有0.02eV的势垒。

The major reaction product of coal in the arc plasma reaction is acetylene and CO. The acetylene is come from the saturates and aromatics in the coal.

2煤在电弧等离子体中反应的主要的产物是乙炔和一氧化碳，乙炔的来源主要是煤中的饱和分和芳香分。

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。