The mass fraction of n-butene in mixed C4 from catalytic cracking after etherized was approximately 40%.
混合c 4中含有质量分数约为40%的正丁烯，是生产丙烯的优质原料。
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Made from etherized regenerated natural cellulose, the hypoallergenic gauze can additionally protect injuries from infection and eliminate the potential for scarring.