Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Simple preparation method for mordenite membrane with low silica-alumina ratio

A technology of mordenite and low silicon-to-aluminum ratio, which is applied in the field of simple preparation of low-silicon-to-aluminum ratio mordenite membranes, can solve problems such as small permeation flux, increased separation factor, and increased flux of zeolite membranes, achieving a smooth and compact surface, Highly repeatable effects

Active Publication Date: 2020-03-24
CHANGZHOU UNIV
View PDF9 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the problem that the high silicon-aluminum ratio of the mordenite membrane leads to poor hydrophilicity on the surface of the zeolite membrane and small permeation flux. The present invention pre-adsorbs deionized water on the seed layer and the ceramic tube support layer before synthesizing the mordenite membrane. , to prepare a zeolite membrane with a smoother surface. The silicon-aluminum ratio of the membrane was tested by energy dispersive X-ray spectrometer (EDX). The test results showed that the silicon-aluminum ratio of the zeolite membrane was smaller than that of the untreated membrane. 92% ethanol / water solution separation performance test, the results show that the flux of the zeolite membrane synthesized by the method proposed by the present invention is improved, and the separation factor is also greatly improved

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Simple preparation method for mordenite membrane with low silica-alumina ratio
  • Simple preparation method for mordenite membrane with low silica-alumina ratio
  • Simple preparation method for mordenite membrane with low silica-alumina ratio

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Divide deionized water into three parts, add sodium hydroxide to one part of deionized water to dissolve, slowly add silica sol to sodium hydroxide solution, stir for 14 hours to form silicon source precursor solution; add sodium metaaluminate to another part Dissolve in a portion of water to form an aluminum source precursor solution; slowly add the aluminum source precursor solution dropwise to the silicon source precursor solution under stirring, and stir at room temperature for 30 minutes; dissolve sodium fluoride in the last portion of deionized water, and add it to the aforementioned solution , stirred at room temperature for 2h to form a synthetic solution. The molar ratio of the synthetic solution is 10Na 2 O : 1.2Al 2 o 3 : 30SiO 2 : 780H 2 O: 15NaF. Soak the seed tube loaded with the seed crystal in deionized water for 20s, and put it at room temperature for 2h until there is no obvious water trace on the surface. After sealing the seed tube, put it in...

Embodiment 2

[0036] The crystal coating method is the same as in Example 1, except that the mother liquor molar ratio is 10Na 2 O : 2.4Al 2 o 3 : 30SiO 2 :780H 2 O: 15NaF. Soak the seed tube loaded with the seed crystal in deionized water for 20s, and put it at room temperature for 2h until there is no obvious water trace on the surface. After sealing the seed tube, put it in a stainless steel reaction kettle, add the synthesis mother liquor, and conduct hydrothermal synthesis at 150 ºC for 24 hours. After the synthesis, the membrane tube was washed to neutral and then dried.

[0037] The silicon-aluminum ratio of the zeolite membrane was measured by EDX. The mordenite membrane was used to separate 92 wt.% ethanol / water solution by pervaporation, and the permeation flux and separation factor of the zeolite membrane were tested.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
pore sizeaaaaaaaaaa
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
Login to View More

Abstract

The invention provides a simple preparation method for a mordenite membrane with a low silica-alumina ratio. The invention mainly aims to solve the problems of poor membrane surface hydrophilicity andlow permeation flux due to high silica-alumina ratio of a zeolite membrane. The simple preparation method is mainly characterized by comprising the following steps: loading large and small seed crystals onto a macroporous alpha-Al2O3 carrier tube so as to prepare a seed crystal tube with flat surface, then pre-adsorbing deionized water onto a seed crystal layer and a ceramic tube supporting layeron the seed crystal tube through the action of capillary coacervation, and synthesizing the mordenite membrane through a secondary growth method. The method provided by the invention effectively reduces the silica-alumina ratio of the surface of the mordenite membrane, increases the compactness of the membrane, and reduces the thickness of the membrane at the same time. In an ethanol / aqueous solution with a concentration of 92 wt.%, the membrane shows excellent separation performance and is significantly improved in permeation flux; meanwhile, the mordenite membrane shows good acid resistancein an HCl or acetic acid solution with a concentration of 1 mol / L.

Description

technical field [0001] The invention belongs to the technical field of inorganic membrane osmosis separation, and relates to a simple preparation method of a low-silicon-aluminum ratio mordenite membrane, in particular to a method of pre-absorbing deionized water on a seed layer and a ceramic tube support layer to increase surface adsorption sites. , to prevent the synthesis liquid from entering the support body, thereby improving the compactness and separation performance of the mordenite membrane. Background technique [0002] In practical industrial applications, it is often necessary to purify organic products. Currently, the commonly used method in industry is rectification. The traditional rectification method has many trays for mixtures with small volatility differences or azeotropic mixtures. high consumption problem. Pervaporation technology is an emerging membrane separation technology for the separation of liquid mixtures. It has the advantages of low energy cons...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D67/00C01B39/26
CPCB01D67/0044B01D71/028C01B39/26
Inventor 任秀秀丁明钟璟徐荣张琪戚律
Owner CHANGZHOU UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com