以下为句子列表：
英文: Patents on removal of olefins in HCFCs and HFCs at home and abroad are gathered up and classified, principles and characteristics of every method are reviewed, the author also points out that adsorption method is an imporant research trend in refining tec
中文: 摘要概括了国内外氢氯氟烃和氢氟烃中烯烃脱除方法的专利文献，评述了各种方法的原理、特点，并指出吸附法是当前氢氯氟烃和氢氟烃精制技术的发展趋势之一。
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