Ceramic hollow fiber membranes with improved mechanical properties

Patent metadata

Field	Value
Publication number	US-10857505-B2
Application number	US-201816043302-A
Country	US
Kind code	B2
Filing date	Jul 24, 2018
Priority date	Jul 31, 2013
Publication date	Dec 8, 2020
Grant date	Dec 8, 2020

Abstract

A method for the manufacture of ceramic hollow fiber membranes in a spinning process by using a spinning mass, comprising the steps: providing a spinning mass formulation; providing a secondary phase; adding the secondary phase to the spinning mass formulation; manufacturing the ceramic hollow fiber membranes in a spinning process.

First claim

What is claimed is:

1. A method for the manufacture of ceramic hollow fiber membranes made of a spinning mass, comprising the steps:
providing a solvent, a polymer and a ceramic powder;
wherein the ceramic powder comprises:
an oxide ceramic material selected from: aluminum oxide, ZrO 2 , TiO 2 and mixtures thereof; or
a non-oxide ceramic material selected from: Si 3 N 4 , AlN, WC, and mixtures thereof;

providing a precipitating agent;
manufacturing of a spinning mass made of the solvent, the polymer and the ceramic powder;
adding a secondary phase to the spinning mass;
injecting the spinning mass into a precipitation bath,
solidifying the polymer upon contact with the precipitating agent;
sintering the solidified polymer to form a green body;
wherein the secondary phase is nanoscaled illite, the nanoscaled illite in the range of 1 to 200 nm.

2. The method according to claim 1 , wherein
in the step of adding a secondary phase, the secondary phase is added in an amount of 0.5 to 10% based on the total solid matter.

3. A ceramic fiber membrane produced by the method according to claim 1 .

4. The method for the manufacture of ceramic hollow fiber membranes according to claim 1 , wherein
the nanoscaled illite comprises chemical major constituents: [SiO 2 : 47.0%±3.5%; Al 2 O 3 : 21.0%±2.0%; Fe 2 O 3 : 7.0%±1.0%; CaO: 4.0%±2.0%; K 2 O: 5.5%±0.7%; MgO: 3.0%±0.75%; Na 2 O: 0.15%±0.05%; TiO 2 : 0.8%±0.1%; P 2 O 5 : 0.3%±0.08%; and TI (total impurity): 11.0%±2.0%].

5. A ceramic hollow fiber membrane comprising:
a ceramic powder,
wherein the ceramic powder comprises:
an oxide ceramic material selected from: aluminum oxide, ZrO 2 , TiO 2 and mixtures thereof; or
a non-oxide ceramic material selected from: Si 3 N 4 , AlN, WC, and mixtures thereof; and

wherein the ceramic hollow fiber membrane is made with a secondary phase of nanoscaled illite, the nanoscaled illite in the range of 1 to 200 nm.

6. The ceramic hollow fiber membrane in claim 5 is an ultrafiltration, microfiltration or a gas separation membrane.

7. A water purification or waste water treatment membrane according to claim 5 .

8. The ceramic hollow fiber membrane according to claim 5 , wherein
the nanoscaled illite comprises chemical major constituents: [SiO 2 : 47.0%±3.5%; Al 2 O 3 : 21.0%±2.0%; Fe 2 O 3 : 7.0%±1.0%; CaO: 4.0%±2.0%; K 2 O: 5.5%±0.7%; MgO: 3.0%±0.75%; Na 2 O: 0.15%±0.05%; TiO 2 : 0.8%±0.1%; P 2 O 5 : 0.3%±0.08%; and TI (total impurity): 11.0%±2.0%].

Assignees

• Mann & Hummel Gmbh

Inventors

• Ehlen Frank
• Woerz Tobias

Classifications

• B01D71/0215

  Silicon carbide; Silicon nitride; Silicon oxycarbide · CPC title

• B01D71/024

  Oxides · CPC title

• B01D69/087 Primary

  Details relating to the spinning process · CPC title

• B01D61/147

  Microfiltration · CPC title

• B01D67/0048

  by sol-gel transition · CPC title