一、前言由于氯氟烃——特定氟利昂(CFC)对大气同温层中存在的臭氧层的破坏,从而造成对地球生态环境的影响,已引起国际上极大关注。1992年初,各国政府尤其是一些发达国家政府纷纷表示,计划在最近三、五年内禁止使用氯氟烃氟利昂及其他危害臭氧层的物质。为了防止臭氧层进一步的破坏,人们研究并提出各种相应措施,如研究寻求新的替代 I. INTRODUCTION The international community has drawn great attention due to the destruction of the ozone layer existing in the stratosphere of CFCs by CFCs and the consequent impact on the Earth’s environment. In early 1992, governments of various countries, especially some developed countries, said they planned to ban the use of CFCs and other ozone-depleting substances in the recent three to five years. In order to prevent further destruction of the ozone layer, people study and propose various measures, such as research to find new alternatives