Method and device for separating aqueous solution of isopropanol and diisopropyl ether

Abstract

The invention discloses a method and device for separating an aqueous solution of isopropanol and diisopropyl ether. The separation method integrates heterogeneous azeotropic rectification technologyand variable-pressure rectification technology, partition tower technology and heat pump technology, and comprises the following steps: adding a raw water solution into an auxiliary tower T1, discharging water from the bottom of the secondary tower, condensing tower top steam and conducting layering, enabling all water phases and part of organic phases to be used for T1 backflow, and enabling remaining organic phases to enter T2, and enabling the tower top steam to be used for a heat pump process; and returning steam at the top of T2 to a main tower T1, and extracting isopropanol and diisopropyl ether products from the bottoms of T1 and T2. The device suitable for the method comprises a partition tower T1, a high-pressure stripping tower T2, a compressor C1, a decanter D1, a condenser E1 and reboilers E2, E3 and E4, wherein the E1, the E2, the E3 and the E4 are respectively connected to the top of the T1, the bottom of the auxiliary tower T1, the bottom of the T2 and the bottom of themain tower T1, the C1 is used for compressing part of steam at the top of the T1, and the D1 is connected behind the C1. The method and device solve the separation problem of a multi-azeotrope complexsystem, and have the advantages of high efficiency, energy saving, high product purity and high recovery rate.

Description

technical field [0001] The invention belongs to the field of separation and purification in the chemical industry, and in particular relates to a method and a device for separating an aqueous solution of isopropanol diisopropyl ether. Background technique [0002] Isopropanol is an important chemical product widely used in the fields of pharmaceuticals, cosmetics, plastics, fragrances and coatings. Diisopropyl ether is an important organic solvent and extractant, and can also be used as a standard substance for chromatographic analysis or a gasoline additive. In recent years, the domestic demand and production of isopropanol and diisopropyl ether have grown rapidly. However, in the process of preparing isopropanol by direct hydration of propylene, the product isopropanol and by-product diisopropyl ether must be separated and recovered from the aqueous solution. The system has complex phase equilibrium behavior: 1). Homogeneous azeotrope, isopropanol / diisopropyl ether, isop...

AI Technical Summary

Problems solved by technology

Although the method and device can obtain high-purity diisopropyl ether, the entrainer methanol is likely to cause secondary pollution of the product, and the complete separation of the mixture has not been realized.

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