Plate shaped ceramic film composed of multiple hollow fiber ceramic films by parallel connection and preparation thereof

Abstract

The invention discloses a tabular hollow fiber ceramic membrane element formed by connecting a plurality of hollow fiber ceramic membranes in parallel and a preparation method thereof. The invention is characterized in that a plurality of hollow fiber ceramic membrane green bodies, one end of which is open and the other end of which is closed or both ends of which are open are sintered at the temperature ranging from 900 to 1600 DEG C for 5 to 20 hours in a state of mutual close contact by aligning both ends and driving single layer to stand side by side; or the tabular hollow fiber ceramic membrane green bodies, which are prepared by a single layered parallel connection of hollow fiber ceramic membranes using extrusion, are sintered at a high temperature ranging from 900 and 1600 DEG C for 5 to 20 hours after being dried. Compared with a single fiber hollow ceramic membrane element, the mechanical strength of the tabular hollow fiber ceramic membrane element is significantly enhanced, thus being beneficial to preparing large-size membrane elements, enhancing the reliability and the service life of the ceramic membrane; moreover, owing to the decrease of the assembly dispersity, the packing density of the membrane components is further enhanced far from being lowered. The tabular hollow fiber ceramic membrane element can be used for manufacturing gas or liquid separation and purification device or high temperature heat exchanger.

Description

technical field [0001] The invention belongs to the technical field of hollow fiber ceramic membranes, specifically relates to ceramic membrane separation technology and ceramic membrane heat exchanger technology, in particular to a plate-shaped hollow fiber ceramic membrane element composed of multiple hollow fiber ceramic membranes connected in parallel and a preparation method thereof . Background technique [0002] According to the "Journal of the American Institute of Chemical Engineers" (AIChE Journal, 51 (7) (2005) 1991-2000), the current structure of ceramic membranes mainly includes three types: flat plate, tubular and hollow fiber. For the ceramic membrane used at high temperature, the existing flat ceramic membrane has the problem of difficult sealing of the membrane module; the tubular ceramic membrane can move the sealing position of the membrane module to the low temperature area, which solves the problem of difficult sealing of the ceramic membrane module The...

AI Technical Summary

Problems solved by technology

For the ceramic membrane used at high temperature, the existing flat ceramic membrane has the problem of difficult sealing of the membrane module; the tubular ceramic membrane can move the sealing position of the membrane module to the low temperature area, which solves the problem of difficult sealing of the ceramic membrane module The ceramic membrane is thicker, the permeation flux of the membrane is low, and the effective membrane area per unit volume of the membrane module (called the packing density of the membrane module) is low; the membrane module of the hollow fiber ceramic membrane element has a higher packing density

[0003] Chinese Patent Publication No. CN101108310A (Patent Application No.: 200710025876.1) discloses "a hollow fiber ceramic membrane element and its assembly", in which several hollow fiber ceramic membranes are assembled into a hollow fiber ceramic membrane bundle, which is assembled from the hollow fiber ceramic membrane bundle Both ends of the membrane module are encapsulated with ceramic sealing material at high temperature, which solves the problem that the membrane module encapsulated with organic adhesive cannot be used under harsh conditions such as high temperature, strong acid, and strong alkali

This kind of membrane module, which consists of several hollow fiber ceramic membranes simply assembled into bundles and fixed and sealed at both ends, still has the following disadvantages: First, the manufacturing length of a single hollow fiber ceramic membrane element is limited due to its low mechanical strength. However, it is not suitable to manufacture membrane modules with large size and large membrane area capacity; secondly, due to the large length / diameter ratio of a single hollow fiber ceramic membrane element, it is easy to randomly bend and deform during the actual preparation process, and thus assembled Membrane modules, in which the bending forms and degrees of each hollow fiber ceramic membrane are different, when used at high temperature and in the process of lowering the temperature to room temperature, the thermal expansion, contraction and thermal stress state of each hollow fiber ceramic membrane are different, It is easy to cause damage and breakage of some hollow fiber ceramic membranes, which reduces the service life of the membrane modules; third, when assembling the membrane modules, it is necessary to realize strict high-temperature ceramic sealing of each hollow fiber ceramic membrane at both ends of the hollow fiber ceramic membrane tube bundle. The sealing technology is very demanding, so the yield rate is low and the manufacturing cost is high

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