| abstract |
One embodiment of the present utility model provides an extraction system for long-chain dibasic acids, which includes a primary membrane filtration unit, a first acidification crystallization unit, a first separation unit, a secondary membrane filtration unit, a second acidification crystallization unit, a second acidification crystallization unit, and a second A separation unit, a crystallization unit, and a third separation unit. The long-chain dibasic acid extraction system of one embodiment of the present invention has a simple structure and can reduce the impurity content of the long-chain dibasic acid product obtained. |