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Method for lower-temperature sintering to prepare acid and alkali-resistant titanium dioxide ceramic ultrafiltration membrane

A ceramic ultrafiltration membrane, titanium dioxide technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation and other directions, can solve the problems of reducing the sintering temperature and reducing the physical and chemical properties of the ceramic membrane, reducing the preparation cost and reducing the The effect of energy consumption and good acid and alkali resistance

Active Publication Date: 2012-12-05
SUNTAR MEMBRANE ENVIRONMENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reduction of the sintering temperature also significantly reduces the physical and chemical properties of the ceramic membrane, such as mechanical strength, acid and alkali resistance, etc.

Method used

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  • Method for lower-temperature sintering to prepare acid and alkali-resistant titanium dioxide ceramic ultrafiltration membrane
  • Method for lower-temperature sintering to prepare acid and alkali-resistant titanium dioxide ceramic ultrafiltration membrane
  • Method for lower-temperature sintering to prepare acid and alkali-resistant titanium dioxide ceramic ultrafiltration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Convert titanyl sulfate to titanium dioxide equivalent, configure titanyl sulfate solution with a mass content of 2.5% titanium dioxide, stir at room temperature for 4 hours to dissolve, filter with 4 layers of medium-speed filter paper to remove solid impurities; weigh a certain mass of dispersant disper740w Add it into the titanyl sulfate solution, prepare a solution with a dispersant mass fraction of 1%, and mix evenly. Under the conditions of a reaction temperature of 25° C., a fixed rate of addition and a stirring speed, the molar ratio of the titanyl sulfate to titanyl sulfate is 1: 1.2 Add ammonium oxalate or oxalic acid solution dropwise to titanyl sulfate solution, stir and react for 1 hour, cool with ice water bath to precipitate out of the solution, filter the precipitate and use 1% oxalic acid or ammonium oxalate solution to treat the precipitate several times Recrystallization removes impurity ions to obtain titanium oxalate precipitation with less impurity ...

Embodiment 2

[0028]Convert titanyl sulfate to titanium dioxide equivalent, configure titanyl sulfate solution with a mass content of 5% titanium dioxide, stir at room temperature for 4 hours to dissolve, filter with 4 layers of medium-speed filter paper to remove solid impurities; weigh a certain mass of dispersant disper750w Add it into titanyl sulfate solution to prepare a solution with a mass fraction of 5% dispersant and mix evenly. Under the conditions of reaction temperature of 50°C, constant addition rate and stirring speed, the molar ratio of titanyl sulfate to ammonium oxalate is 1:1.5. Or add oxalic acid solution dropwise to titanyl sulfate solution, stir and react for 1 hour, cool with ice water bath to precipitate out of the solution, filter the precipitate and use 1% oxalic acid or ammonium oxalate solution to remove the precipitate by multiple recrystallization Impurity ions obtain titanium oxalate precipitation with less impurity content; convert titanium oxalate into titaniu...

Embodiment 3

[0030] Convert titanyl sulfate to titanium dioxide equivalent, configure titanyl sulfate solution with a mass content of 0.5% titanium dioxide, stir at room temperature for 4 hours to dissolve, filter with 4 layers of medium-speed filter paper to remove solid impurities; weigh a certain mass of dispersant disper752w Add to titanyl sulfate solution to prepare a solution with a mass fraction of dispersant of 0.5% and mix evenly. Under the conditions of reaction temperature of 60°C, fixed dropping speed and stirring speed, the molar ratio of titanyl sulfate to ammonium oxalate is 1:1. Or add oxalic acid solution dropwise to titanyl sulfate solution, stir and react for 1 hour, cool with ice water bath to precipitate out of the solution, filter the precipitate and use 1% oxalic acid or ammonium oxalate solution to remove the precipitate by multiple recrystallization Impurity ions obtain titanium oxalate precipitation with less impurity content; convert titanium oxalate into titanium...

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Abstract

The invention relates to a method for lower-temperature sintering to prepare an acid and alkali-resistant titanium dioxide ceramic ultrafiltration membrane. The method takes titanyl sulfate, ammonium oxalate or oxalic acid as a raw material, is combined with a technology of preparing small nanometer materials through a sol-gel method and a solid particle sintering technology, so the technology for preparing the acid and alkali-resistant titanium dioxide ceramic ultrafiltration membrane under the low-temperature sintering condition is obtained. The layer pore size distribution scope of the ceramic ultrafiltration membrane which is produced by the method is between 10-30nm, and the water flux under the operation condition of 0.1MPa is 400-600L / m<3>h; and the prepared ceramic ultrafiltration membrane has very good acid resistance and alkali resistance and brighter application prospect. The method uses inorganic titanium salt with lower price as the raw material for synthetizing titanium dioxide, so the preparation cost of the ceramic membrane is lowered; and moreover, compared with a solid particle high-temperature sintering technology of the existing ceramic membrane industrial production, the method adopts a lower-temperature sintering technology, so the energy consumption is reduced, and the produced product has higher cost performance.

Description

technical field [0001] The invention relates to a method for preparing a ceramic ultrafiltration membrane layer, in particular to a method for preparing an acid and alkali-resistant titanium dioxide ceramic ultrafiltration membrane layer by low-temperature sintering. Background technique [0002] Compared with organic membranes, ceramic membranes have the advantages of high temperature resistance, good chemical stability, high mechanical strength, microbial resistance, long service life, high recycling rate, controllable pore size and low pollution, and can meet the conditions of high acid-base, high temperature, etc. Harsh occasions have developed rapidly in recent years and are widely used in many fields such as chemical industry, food, environmental protection, and biological engineering. According to the separation principle and membrane pore size, ceramic membranes can be divided into microfiltration, ultrafiltration, nanofiltration and reverse osmosis. The pore size o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/10B01D71/02B01D67/00
Inventor 林玲玲洪昱斌翁志龙滕双双王强立蓝伟光
Owner SUNTAR MEMBRANE ENVIRONMENT TECH
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