帮我翻译 回流温度下反应7 h

无语法错误

可以有下述几种表示， 取决于你的上文
It was heated at refluxing for 7h.
It reacted at refluxing temperature for 7h.
(the resulting mixture) was heated at refluxing temperature for 7h.
to react at refluxing temperature for 7h.
to react under the condition of refluxing temperature for 7h.

Reaction at reflux temperature for 7 hours. 再看看别人怎么说的。