Azeotrope separation process

Abstract

An azeotrope separation process includes the steps: 1) adding raw materials into an extraction kettle, adding extraction agents, stirring the raw materials for a certain time, standing and separating the raw materials into a water phase and an oil phase; 2) transferring one of the water phase and the oil phase into a rectifying still, heating the raw materials by a rectifying still reboiler and enabling a vapor phase to rise into a rectifying tower; 3) condensing the vapor phase rising to the top of the rectifying tower into liquid, setting a suitable reflux ratio after total reflux stabilization, extracting over heads, then extracting products and finally extracting intermediate cut. The azeotrope separation process combines the advantages of batch rectification and extraction rectification, and is flexible in operation, good in stability, low in equipment investment and applicable to separation of a azeotropic system and a near-boiling system.

Description

technical field

[0001] The invention relates to an azeotrope separation process, which belongs to the field of azeotrope separation and purification. Background technique

[0002] In the separation of petrochemical products, it is often necessary to separate two products with very close boiling points. If ordinary distillation methods are used, the number of theoretical plates and reflux ratio required are large, and the investment and operating costs are high.

[0003] Extractive distillation is a special distillation separation technology, which is suitable for the separation of azeotropic systems. The purpose of separation is achieved by continuously adding extractant to the top of the rectification tower to change the relative volatility between the original components. By combining extraction and rectification, it combines the advantages of batch rectification and extractive rectification, with flexible operation, small equipment investment, and cost savings. It is sui...

Images