回流的讲法除了refiux貌似也没有什么了...
但是reflux还是主动语态用得多,你不妨考虑把你的句子变成两个短句,如：a stirred solution of ...is prepared by.Reflux the solution for 0.5h.
更干脆一点就直接reflux the mixture of ...for 0.5h
不过突然发现用被动语态也行,翻了几篇文献总算找到个例句：
Next,117 g of 1-bromo-3-chloropropane was added rapidly under stirring at room temperature,
and the reaction mixture was refluxed for 16 h
好吧,果断用reflux吧!