The conversion-per-pass is generally low, thus necessitating gas recycle to increase overall product yield.
其单程转化率一般是低的，因此有必要使气体循环以提高总的产品收率。
Dimethylethanolamine (DMEA) is an important chemical product, but there exists low yield disadvantage in its current synthesis technique because of many side reactions.
二甲基乙醇胺(DMEA)是一种重要的化工产品，其现有的合成工艺由于存在副反应导致收率较低。
This process had some advantages, such as high yield, high product quality, low cost and no large amounts of waste sulfuric acid.
此种方法合成四氯苯酐具有产品产率高、质量好、成本低且不产生大量废硫酸的优点。
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