低温三效精馏
Low temperature triple-effect rectification
四塔三效低温精馏是采用两级减压浓缩、粗品DMF减压精馏、成品DMF减压脱酸精制的工艺过程。Four-column triple-effect rectification takes the technological process of two stage reduction pressure concentration, crude DMF reduction pressure rectification, finished DMF product pressure reduction deacidification refinement.
特点：
Features:
◆ 节能。四塔三效在系统中热量经两次重复利用，使整套装置的能耗大大降低，与单塔精馏相比节能60%，与双塔精馏相比节能30%。
Energy conservation: the heat of four-column triple-effect in the system is recycled two times, making the whole set device energy consumption decreased sharply. Comparing to single-tower rectification, energy conservation can get 60%, comparing to two- column rectification, energy conservation can get 30%.
◆ 回收率高。采用低温精馏塔塔釜温度（145度），DMF分解率低，成品回收率高。回收率≥97%。
High recovery rate: utilize low temperature rectifying column temperature (145℃) with low DMF resolution rate, high finished product recovery rate. The recovery rate can equal to or more than 97%.
◆ 产品品质稳定性好。在脱酸系统中可以将DMF成品中的水分、二甲胺、甲酸同时脱除。DMF成品品质达到：水份≤300ppm、甲酸≤30ppm、二甲胺≤30ppm。
High product quality stability: deacidification system can remove moisture, dimethylamine, formic acid from the finished DMF product simultaneously, at same time the finished DMF product quality can get: moisture ≤300ppm, formic acid ≤30ppm, dimethylamine ≤30ppm. |
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