Product reflux extraction column

Abstract

The invention relates to a product refluent extracting tower, and a disperse phase and a continuous phase have countercurrent contact to cause mass transfer; the extracted products are discharged from the top or the bottom of the tower, and an extraction phase is discharged from the bottom or the top of the tower; when being discharged, the products are divided into two branches, one of which is a production branch which flows towards a post treatment workshop section of products, and the other one is a refluent branch that flows towards an oil phase material inlet pipeline and is evenly mixed with oil phase material liquid to enter the tower again. The flow rate of the refluent branch is controlled by a valve and changes along with the change of the flow rate of the material liquid, and the sum of the flow rates of the refluent branch and the material liquid is kept to be fixed value. By introducing the refluent branch of the extracted products, the velocity of flow of the disperse phase entering the tower is stable and is at the point with top efficiency under the different feeding flow rates of the disperse phase, thereby ensuring the velocity of flow of the disperse phase in the tower is consistent, greatly overcoming the disadvantages of unstable operation, low extraction efficiency and the like of the traditional process flow caused by the change of the flow rate of the material liquid, simultaneously reducing the initial concentration of the disperse phase and further enhancing the purity of the extracted products.

Description

technical field [0001] The invention relates to an extraction tower for product reflux to improve operation stability, which belongs to the improvement of the extraction tower used in the operation process of a chemical extraction unit, in particular to the extraction tower for product reflux. technical background [0002] Liquid-liquid extraction is an important operation link widely used in petrochemical, pharmaceutical, metallurgical and other industries. The traditional industrial liquid-liquid extraction tower is roughly as figure 1 As shown, due to the influence of factors such as market conditions and raw material supply, the operation of the equipment is often not at the optimal operating point. However, the experiment found that for general extraction towers, the separation efficiency of the equipment changes with the flow rate of the liquid-liquid two phases. When the dispersed phase flow rate increases, the separation efficiency of the equipment increases, figu...

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Problems solved by technology

[0003] In order to overcome the shortcomings of traditional liquid-liquid extraction towers such as low product purity and poor operational stability due to changes in operating conditions, the invention provides an extraction tower in which the product is refluxed to improve operational stability. Under the same operating conditions as the extraction tower, by increasing the reflux stream to adjust the flow rate of the dispersed phase in the extraction tower, the flow rate of the dispersed phase in the extraction tower remains stable and always operates at a higher efficiency point, thereby improving product purity and operational stability

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