以下为句子列表：
英文: For improving product purifying the conditions in recrystallization processes were investigated and a new method for the improving product purity is proposed.
中文: 结果表明，采用最佳反应条件，可使合成盐酸二甲双胍的产率提高，产品可一次性达到合格标准，找到了提高产品纯度的新途径。
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英文: Using sodium dicyandiamide and saccharin as raw materials, tribenuron-methyl is synthesized via ring-opening reaction, phosgenation and condensation with total yield of 57.0% and product purity of 95.6%.
中文: 以双氰胺钠和糖精为起始原料，经过开环、光气化、缩合等一系列反应制备了苯磺隆，合成反应的总收率可达57.0%以上，纯度可达95.6%以上。
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