然而，取代氯氟烃，包含在塑料和制冷剂中的臭氧亲和物质——氟氯化碳（HCFs）和氟氯烃（HFCs），同样也是强大的温室气体。
However, the ozone-friendly substances that have replaced CFCs in plastics or as refrigerants - hydrochlorofluorocarbons (HCFCs) and hydrofluorocarbons (HFCs) -- are also powerful greenhouse gases.
我公司“18.30”工程成功实现了用醇烃化精制工艺取代铜洗工艺，达到了预期目标。
Replacing the process of copper liquor wash with methanolizing and alkylating was successful in "18·30" project in our company.
当烃(典型的烷烃)的几个或全部氢被氯和氟取代而生成的化合物。
Compounds formed when some or all of the hydrogen atoms in a hydrocarbon (typically an alkane) have been replaced with chlorine and fluorine.
本文报道了锆烯络合物对炔烃的烷基化加成，合成多取代烯烃，产率较高。
This paper reports the route of synthesis multisubstituted alkenes by addition reaction of alkyne zirconalkylation with zirconocene complexes.
对2-H苯并咪唑盐与烃基为不饱和取代基的格利雅试剂的加成-水解反应进行了研究，将此反应应用到不饱和醛的制备。
The addition-hydrolysis reaction was applied to the synthesis of unsaturated aldehyde by the -reaction of 2-H benzimidazolium iodide with alkenyl magnesium bromide.
一项研究表明，以牙科麻醉剂“笑气”之名著称的氧化亚氮，已取代氟氯烃，成为上层大气中的臭氧最强有力的破坏物。
Nitrous oxide, better known as the dental anaesthetic "laughing gas", has replaced CFCs as the most potent destroyer of ozone in the upper atmosphere, a study has shown.
Q 1 是可被取代的饱和或不饱和的5-或6-元环烃基等；
Q1 represents optionally substituted, saturated or unsaturated 5- or 6-membered hydrocarbyl, etc.
烃中一个或多个氢原子被氯原子取代。
Chlorinated hydrocarbon a hydrocarbon in which one or more hydrogen atoms are replaced by chlorine atoms.
介绍了环氧氯代烃的两种化学反应：取代反应和开环反应。
Two reactions of epichlorohydrocarbon that is opening-ring and substitute reaction were introduced, at the same time, some kinds of medication made from epichlorohydrin were introduced .
介绍了环氧氯代烃的两种化学反应：取代反应和开环反应。
Two reactions of epichlorohydrocarbon that is opening-ring and substitute reaction were introduced, at the same time, some kinds of medication made from epichlorohydrin were introduced .
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