Preparation method for synthesizing ZIF-67 membrane through in-hole membrane formation

Abstract

The invention belongs to the technical field of separation materials, and provides a preparation method for synthesizing a ZIF-67 membrane through in-hole membrane formation, which specifically comprises the following steps: introducing a precursor solution of cobalt into a porous carrier pore channel, suspending the carrier in a kettle containing a certain amount of ligand solution, forming steam from the solution in the kettle under a heating condition, and forming a membrane at a phase interface by the steam formed by the solution in the kettle and the precursor solution in the pore channel. Although the membrane is divided into countless small membranes by each hole wall, each membrane is formed in a small space, is relatively complete and thin, and has no gap with the hole wall, a plurality of complete membranes and the hole wall form a large complete membrane together, and the membrane is not a large membrane, so that the membrane can be thin and has good stability, and the purpose of separation is achieved. The method has the advantages of high repeatability, effective solvent saving and certain separation capability.

Description

technical field [0001] The invention belongs to the technical field of separation materials, and relates to the preparation and application of a metal organic framework, in particular to a preparation and application method of zeolite-like imidazole framework compounds. Background technique [0002] my country is the largest coke production, consumption and exporter in the world. A large amount of coke oven gas will be produced in the coke production process. The main components of coke oven gas are methane, hydrogen and a small amount of nitrogen. If the coke oven gas can be fully Utilization will be a considerable economic income. Therefore, it is particularly important to realize the efficient separation of hydrogen and methane. [0003] Membrane separation is an advanced separation technology developed in recent years. It is known as one of the most potential high-end separation technologies. It has the advantages of environmental friendliness, low energy consumption, sma...

AI Technical Summary

Problems solved by technology

At present, membrane materials are mainly divided into two categories: inorganic membranes and organic membranes. Organic polymer membranes are corrosion-resistant and easy to form and process, but have the disadvantages of swelling and poor stability. Due to their excellent thermal and chemical stability, inorganic membranes Compared with the traditional zeolite membrane, the ZIFs series membrane not only has all the advantages of zeolite, but also has adjustable pore size, and the surface is easy to chemical Modified features, is a promising membrane material

[0004] At present, the synthesis of membranes mainly includes in-situ growth method, seed crystal induction method, homologous metal oxide induction and vapor-gel method, etc. Surface film formation has great difficulties in synthesizing thin, continuous and dense films. At the same time, it generally faces problems such as poor repeatability, weak binding force between the film and the carrier, and low strength of the film. It has extremely high requirements for the carrier, and generally requires tens of Nano, the process is difficult and expensive, which greatly limits the industrial application. Aiming at the currently commonly used 2-3 micron cheap macroporous carrier, a preparation method for the synthesis of ZIF-67 membrane by forming a film in the hole is proposed, providing a new Ideas in Separated Fields

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