Zeolite membrane complex, method of producing zeolite membrane complex, and hydrothermal synthesis apparatus

Abstract

The invention provides a zeolite membrane composite, a method for producing the zeolite membrane composite, and a hydrothermal synthesis device. A zeolite membrane composite is provided with: a support body having a long member having a length of 50 cm or more and having at least one through-hole extending in the longitudinal direction; and a zeolite membrane provided on the inner peripheral surface of the through-hole of the support body or on the outer peripheral surface of the support body from one end of the support body to the other end thereof in the longitudinal direction. When the concentration of the main element of the zeolite membrane is measured in three portions obtained by trisecting the support body in the longitudinal direction, the concentration of the main element gradually decreases from the portion on the one end side toward the portion on the other end side, using the most constituent element other than oxygen among the constituent elements of the zeolite membrane as the main element, and when the concentration of the main element in the zeolite membrane is measured in three portions. The ratio of the concentration of the main element in the portion on the other end side to the concentration of the main element in the portion on the one end side is 0.90 or more. As a result, it is possible to provide a long zeolite membrane composite having a zeolite membrane having few defects.

Description

technical field [0001] The invention relates to a zeolite membrane complex, a manufacturing method of the zeolite membrane complex and a hydrothermal synthesis device. [0002] [reference of related application] [0003] This application claims the benefit of priority of Japanese Patent Application JP2020-28180 filed on February 21, 2020, and Japanese Patent Application JP2021-17178 filed on February 5, 2021, the entire disclosures of which are included in this application middle. Background technique [0004] Conventionally, a zeolite-membrane composite in which a zeolite membrane is supported on a porous support has been used. As a support, a ceramic porous body is generally used. In addition, a zeolite membrane is usually synthesized by hydrothermal synthesis using a hydrothermal synthesis device. In hydrothermal synthesis, a zeolite membrane is formed in the presence of hot water at high temperature and pressure. Usually, in the synthesis of a zeolite membrane, in o...

AI Technical Summary

Problems solved by technology

However, in the hydrothermal synthesis of the zeolite membrane in a stationary state, when the zeolite membrane is formed on a long support, the composition of the zeolite membrane is likely to vary compared with the case of a short support, and it is easy to Defects such as poor film formation, heterogeneous phase formation, and cracking during the removal of the structure directing agent (heating process)

In addition, in the methods of Documents 1 and 2, since the structure of the hydrothermal synthesis device is complicated, the device tends to become expensive, and on this basis, it is difficult to apply it to a long zeolite membrane composite.

In addition, even in the case of using the methods of Documents 1 and 2, the composition of the zeolite membrane, etc. will vary, and defects will easily occur.

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