Method for separating water component of acetic acid-water system by using Ge-ZSM-5 molecular sieve film

Abstract

The invention provides a method for separating a water component of an acetic acid-water system by using a Ge-ZSM-5 molecular sieve film. Particularly, a ZSM-5 zeolite molecular sieve film doped with germanium atoms is used for a high-concentration acetic acid water solution to permeate and evaporate to separate the acetic acid; separation factors can be infinitely great and the flux is higher than the existing technology. A synthesis method of the zeolite molecular sieve film is a template-agent-free method; the production cost is greatly reduced, a production process is simplified and the environment protection is facilitated; raw materials are national low-price products, are convenient and easy to obtain and have a low cost. In the aspect of selection, the water concentration of a permeation side can be up to 100% and the separation factors can be infinitely great; in the aspect of flux, the flux can be stabilized to be 600g / m<2>*h for a long period, and the temperature dependency and the concentration dependency are very good.

Description

technical field [0001] The invention relates to the application of a zeolite molecular sieve membrane to separate water components in acetic acid and aqueous solution, specifically refers to the use of ZSM-5 zeolite molecular sieve membrane doped with germanium atoms for pervaporation and separation of acetic acid in high-concentration acetic acid aqueous solution, and the separation factor can reach Infinity, the throughput is higher than the existing technology. Background technique [0002] The side reaction in the high-purity acetic acid production process will produce a certain amount of water. The method commonly used to remove water in the product is rectification, and the boiling points of acetic acid and water are relatively close. Common industrial rectification separates acetic acid and The water method has high energy consumption, high cost and is not conducive to environmental protection. As an emerging membrane separation technology, pervaporation has many adva...

AI Technical Summary

Problems solved by technology

Using the method of large and small seed crystals combined with coated crystals, modifying the carrier with large seeds, inducing film formation with small seeds, and using a template-free formula to synthesize a layer of thickness on the commercially available cheap macroporous α-Al2O3 ceramic tube carrier The Ge-ZSM-5 zeolite molecular sieve membrane of about 2.5 μm solves the two main aspects of zeolite molecular sieve membrane flux and selectivity

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