Method for preparing high performance silicalite-1 zeolite membrane

Abstract

The invention discloses a method for preparing a high performance silicalite-1 zeolite membrane, which relates to a method for preparing a zeolite membrane, wherein a mixed solution which is prepared through porous anodic alumina or silica ceramic tube carriers by utilizing acacia gum, carboxymethyl cellulose, tannic acids, soluble starch, sucrose and glycerol is soaked and dried for many times, deionized water is weighed and is hydrothermally compounded to prepare the silicalite-1 zeolite membrane, the dried silicalite-1 zeolite membrane is activated fat a certain time in 400-600 DEG C to remove a diaphragm agent in a zeolite membrane channel. The method for preparing the high performance silicalite-1 zeolite membrane can effectively improve separation performance, is beneficial to reduce preparation cost of the silicalite-1 zeolite membrane, is simple simultaneously, can be used for chip carriers, also can be used for tubular carriers and multi-channel carriers, is suitable to prepare the silicalite-1 zeolite membrane in a large scale, and is convenient for application and promotion. The method for preparing the high performance silicalite-1 zeolite membrane is beneficial to reduce preparation cost, and supplies necessary technical support to urge large-scale preparation of the high performance silicalite-1 zeolite membrane to achieve at an early date.

Description

technical field [0001] The invention relates to a preparation method of a molecular sieve membrane, in particular to a preparation method of a high-performance silicalite-1 molecular sieve membrane. Background technique [0002] Since Suzuki first reported the preparation of molecular sieve membranes in 1987, the preparation level of molecular sieve membranes has been greatly improved, and the preparation and application range of different types of molecular sieve membranes have been further expanded. So far, more than 14 kinds of molecular sieves have been used to prepare molecular sieve membranes. Among the preparation of these molecular sieve membranes, the MFI type molecular sieve membrane (including ZSM-5 and silicalite-1) is the most widely studied one, mainly because this type of molecular sieve membrane can selectively separate some important chemical raw materials, such as p-Xylene is separated from its isomers. As a shape-selective catalyst with excellent perform...

AI Technical Summary

Problems solved by technology

[0003] Judging from the reports in the literature, one of the important reasons why the high-performance and high-repeatability silicalite-1 molecular sieve membranes are difficult to prepare is that molecular sieve crystals are easy to form in the pores of the porous carrier and the inner surface of the ceramic tube during the hydrothermal synthesis process, thereby reducing the Membrane Separation Performance

In order to effectively reduce the adverse effects caused by the infiltration of synthetic liquid into the carrier, the organic polymer filling and TEOS and furfural mixture filling methods reported in the literature have certain limitations, the pretreatment method is relatively complicated, and is not suitable for tubular carriers. The use of tubular carriers is an inevitable choice to realize the industrialization of silicalite-1 molecular sieve membranes